Дисертації з теми "Photoelectrocatalytic"
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Kosa, Samia Abdulhamied. "Photoelectrocatalytic disinfection of E. coli by TiOâ‚‚." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407580.
Повний текст джерелаZaballa, Vicente. "Photoelectrocatalytic degradation of organic pollutants with TiOâ‚‚ electrodes." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248657.
Повний текст джерелаPurnama, Herry. "Photocatalytic and photoelectrocatalytic Decolourization of Dyes by Titanium dioxide." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506503.
Повний текст джерелаLi, Guiying. "A Tio2 Photoelectrocatalytic System for Wastewater Detoxification and Disinfection." Thesis, Griffith University, 2010. http://hdl.handle.net/10072/367000.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Cibrev, Dejan. "Photoelectrocatalytic and photoelectrochromic properties of composite nanostructured metal oxide films." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/99689.
Повний текст джерелаYu, Jie. "IN SITU INFRARED STUDIES OF CARBON DIOXIDE CAPTURE AND PHOTOELECTROCATALYTIC REDUCTION." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1502103664018951.
Повний текст джерелаSohn, Yon S. "Photoelectrocatalytic degradation of organic dye molecules on titanium dioxide nanotubular array." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1455707.
Повний текст джерелаOsugi, Marly Eiko. "Avaliação de processos de degradação de corantes dispersos por técnicas eletroquímica e fotoeletroquímica usando eletrodos de Pt, filmes finos e nanotubos de 'TI'/'TI"O IND. 2' e bicomponentes 'W'/'W"O IND. 3'/'TI"O IND. 2' /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/105732.
Повний текст джерелаBanca: Paulo Roberto Bueno
Banca: Arthur de Jesus Motheo
Banca: Romeu Cardozo Rocha Filho
Bana: Rodnei Bertazolli
Resumo: O comportamento eletroquímico de três corantes dispersos, Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13 foi investigado em N,N-dimetilformamida usando tetrafluorborato de tetrabutilamônio como eletrólito de suporte. O grupo nitro dos corantes é reduzido em potenciais de -0,85 V, -0,79 V e -0,69 V, respectivamente, para os corantes Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13. A oxidação do grupo amino, também presente nos corantes investigados, ocorre, respectivamente, em potencial de 0,95 V, 0,90 V e 1,0 V e promove a clivagem do grupo azo. Devido à toxicidade e mutagenicidade destes corantes, analisada pelos testes de citotoxicidade em células humanas embrionárias HEK293 e de Ames, respectivamente, investigou-se no presente trabalho novos métodos de degradação dos mesmos em meio aquoso usando o agente dispersante comercial "Emulsogen" por meio de tratamento com cloro ativo (cloração convencional) e fotoeletroquimicamente pela geração de radicais cloro "in situ" sobre eletrodos nanoparticulados de Ti/TiO2, preparados pelo método sol-gel, em NaCl 0,1 mol L-1. A oxidação fotoeletrocatalítica, sobre eletrodos nanoparticulados de Ti/TiO2 em NaCl, mostrou-se mais eficiente quando comparada à cloração convencional, tanto na descoloração que promoveu 100% de remoção de cor, quanto na mineralização dos mesmos (até 60% de remoção de COT). A mutagenicidade dos corantes estudados foi drasticamente reduzida após tratamento fotoeletroquímico. No entanto, a cloração convencional não foi eficiente para total remoção da atividade mutagênica dos corantes, observando-se, ainda, um aumento para o corante Vermelho Disperso 13. A degradação também foi investigada sobre eletrodos de nanotubos de Ti/TiO2, preparados pelo método de anodização eletroquímica... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The electrochemical behavior of three disperse dyes, Disperse Red 1, Disperse Orange 1 and Disperse Red 13, was investigated using N,N-dimethylformamide using in tetrabutylammonium tetrafluoroborate as supporting electrolyte. The nitro group of the dyes is reduced in potential of -0.85 V, 0.79 V and -0.69 V, respectively, for Disperse Red 1, Disperse Orange 1 and Disperse Red 13. The oxidation of amine group, also presents in the dyes molecules, occurs, respectively, at 0.95 V, 0.90 V and 1.0 V and promotes cleavage of azo group. Because of these dyes toxicity and mutagenicity, analyzed by citotoxicity in embryonic human cells HEK293 and mutagenicity detected by Ames test, respectively, new methods of degradation of these dyes in aqueous medium using the commercial dispersant agent "Emulsogen" was investigated by active chlorine treatment (conventional chlorination) and photoelectrochemically by "in situ" chlorine radicals generation using Ti/TiO2 nanoparticulates electrodes, prepared by solgel method, in 0.1 mol L-1 NaCl. The photoelectrocatalytic oxidation, using Ti/TiO2 nanoparticulates electrodes in NaCl presented higher efficiency when compared to conventional chlorination, leading to 100% of color removal and also 60% of mineralization of dyes measured as TOC removal. The mutagenicity of all investigated dyes was dramatically reduced after photoelectrochemical treatment. However, the conventional chlorination was not efficient for mutagenic activity removal of dyes and promoted an increase for Disperse Red 13. The degradation was also investigated using Ti/TiO2 nanotubes electrodes, prepared by electrochemical anodization in fluoride medium and characterized by SEM and photocurrent curves. These electrodes presented 100% of discoloration of all investigated dyes and total organic carbon removal around 70% after 3 hours of photoelectrocatalytic degradation... (Complete abstract click electronic access below)
Doutor
Zhang, Lin. "Photoelectrocatalytic CO2 conversion in ionic liquid/aqueous mixture solution studied by scanning electrochemical microscopy." Thesis, Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2020SORUS122.pdf.
Повний текст джерелаThis thesis studies photoelectrochemical CO2 reduction reaction (PEC CO2RR) on p-type semiconductor CuCo2O4 addressing the cocatalytic role of imidazolium based RTILs by scanning photoelectrochemical microscopy (SPECM). CuCo2O4 was studied in different solvent supporting electrolyte systems including: aqueous solution (0.1 M KHCO3 and 0.1 M Na2SO4), binary mixture solution (25 vol.% [C2mim][BF4]/H2O and 25 vol.% [C4mim][BF4]/H2O) and pure RTILs ([C2mim][BF4], [C4mim][BF4]) to explore by SPECM the role of RTILs in CuCo2O4 semiconductor PEC performance. Significantly enhanced photoreduction current under both UV-vis and visible light illumination is reported in 25 vol.% [C2mim][BF4]/H2O solution. Only CO generated from PEC CO2RR was detected using an in-situ detection method based on a home-made dual tip optical fiber-ultramicroelectrode (OF-UME) and from bulk electrolysis under illumination. The formation of CO at potentials more positive than the thermodynamic value clearly points out that direct CO2 reduction on the electrode surface is not the mechanism. A possible reaction scheme for the PEC CO2RR mediated by [C2mim]+ is proposed. Thus, our results have demonstrated for the first time the cocatalytic role of [C2mim]+ for the PEC CO2RR. In addition, electrochemical CO2RR has also been studied on various synthesized transition metal–nitrogen–carbon catalysts (M–N–Cs) by rotating disk electrode. 25%Fe25%Co–N–C exhibited the best performance among the studied M–N–Cs in this thesis. The presence of Co sites in that catalyst provided synergic effect for the generation of distributed Fe-rich microcubes, which act as active sites in electrochemical CO2RR
Todd, Malcolm John. "Development and characterisation of a WO3-based photoanode for application in a photoelectrocatalytic fuel cell." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33583.
Повний текст джерелаGutkowski, Ramona [Verfasser], Wolfgang [Gutachter] Schuhmann, and Martin [Gutachter] Muhler. "Photoelectrocatalytic energy conversion using metal oxide composite photoanodes / Ramona Gutkowski. Gutachter: Wolfgang Schuhmann ; Martin Muhler." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1112326790/34.
Повний текст джерелаOsugi, Marly Eiko [UNESP]. "Avaliação de processos de degradação de corantes dispersos por técnicas eletroquímica e fotoeletroquímica usando eletrodos de Pt, filmes finos e nanotubos de 'TI'/'TIO IND. 2' e bicomponentes 'W'/'WO IND. 3'/'TIO IND. 2'." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/105732.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O comportamento eletroquímico de três corantes dispersos, Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13 foi investigado em N,N-dimetilformamida usando tetrafluorborato de tetrabutilamônio como eletrólito de suporte. O grupo nitro dos corantes é reduzido em potenciais de -0,85 V, -0,79 V e -0,69 V, respectivamente, para os corantes Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13. A oxidação do grupo amino, também presente nos corantes investigados, ocorre, respectivamente, em potencial de 0,95 V, 0,90 V e 1,0 V e promove a clivagem do grupo azo. Devido à toxicidade e mutagenicidade destes corantes, analisada pelos testes de citotoxicidade em células humanas embrionárias HEK293 e de Ames, respectivamente, investigou-se no presente trabalho novos métodos de degradação dos mesmos em meio aquoso usando o agente dispersante comercial “Emulsogen” por meio de tratamento com cloro ativo (cloração convencional) e fotoeletroquimicamente pela geração de radicais cloro “in situ” sobre eletrodos nanoparticulados de Ti/TiO2, preparados pelo método sol-gel, em NaCl 0,1 mol L-1. A oxidação fotoeletrocatalítica, sobre eletrodos nanoparticulados de Ti/TiO2 em NaCl, mostrou-se mais eficiente quando comparada à cloração convencional, tanto na descoloração que promoveu 100% de remoção de cor, quanto na mineralização dos mesmos (até 60% de remoção de COT). A mutagenicidade dos corantes estudados foi drasticamente reduzida após tratamento fotoeletroquímico. No entanto, a cloração convencional não foi eficiente para total remoção da atividade mutagênica dos corantes, observando-se, ainda, um aumento para o corante Vermelho Disperso 13. A degradação também foi investigada sobre eletrodos de nanotubos de Ti/TiO2, preparados pelo método de anodização eletroquímica...
The electrochemical behavior of three disperse dyes, Disperse Red 1, Disperse Orange 1 and Disperse Red 13, was investigated using N,N-dimethylformamide using in tetrabutylammonium tetrafluoroborate as supporting electrolyte. The nitro group of the dyes is reduced in potential of –0.85 V, 0.79 V and –0.69 V, respectively, for Disperse Red 1, Disperse Orange 1 and Disperse Red 13. The oxidation of amine group, also presents in the dyes molecules, occurs, respectively, at 0.95 V, 0.90 V and 1.0 V and promotes cleavage of azo group. Because of these dyes toxicity and mutagenicity, analyzed by citotoxicity in embryonic human cells HEK293 and mutagenicity detected by Ames test, respectively, new methods of degradation of these dyes in aqueous medium using the commercial dispersant agent “Emulsogen” was investigated by active chlorine treatment (conventional chlorination) and photoelectrochemically by “in situ” chlorine radicals generation using Ti/TiO2 nanoparticulates electrodes, prepared by solgel method, in 0.1 mol L-1 NaCl. The photoelectrocatalytic oxidation, using Ti/TiO2 nanoparticulates electrodes in NaCl presented higher efficiency when compared to conventional chlorination, leading to 100% of color removal and also 60% of mineralization of dyes measured as TOC removal. The mutagenicity of all investigated dyes was dramatically reduced after photoelectrochemical treatment. However, the conventional chlorination was not efficient for mutagenic activity removal of dyes and promoted an increase for Disperse Red 13. The degradation was also investigated using Ti/TiO2 nanotubes electrodes, prepared by electrochemical anodization in fluoride medium and characterized by SEM and photocurrent curves. These electrodes presented 100% of discoloration of all investigated dyes and total organic carbon removal around 70% after 3 hours of photoelectrocatalytic degradation... (Complete abstract click electronic access below)
Tian, Fang. "Studies of LPCVD and anodised TiOâ†2 thin films and their photoelectrocatalytic photochemical properties for destruction of organic effluents." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366874.
Повний текст джерелаTinlin, James Robert. "Photoelectrocatalysis by TIOâ‚‚ electrodes." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270802.
Повний текст джерелаLi, Wei. "Understanding and Controlling Photoelectrode Surface for Solar Fuel Production and Beyond." Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:108121.
Повний текст джерелаAmong the existing strategies to direct solar energy harvesting and storage, solar fuel production by photoelectrocatalysis promises a comparatively simple, low-cost route. The science behind this process is straightforward: stable semiconductors absorb sunlight and use the energy to excite charges, which then drive redox reactions at the surface. Careful studies of the photoelectrode surface provide important considerations in building a high-performance photoelectrode. Specifically, I focused on controlling the surface band alignment of Cu2O photocathode|water for hydrogen evolution reaction. A ZnS buried heterojunction is formed to improve the photovoltage. Then I focused on understanding the influence of chemical species on surface kinetics and energetics for water oxidation reaction. Two hematite photoanodes with preferably exposed {001} and {012} facets were examined. Further, I systematically studied three different types of surfaces, bare hematite, hematite with a heterogenized Ir water oxidation catalyst (WOC), and a heterogeneous IrOx WOC. While both WOCs improve the performance of hematite by a large margin, their working mechanisms are found to be fundamentally different. I also focused on utilizing surface photoexcited species to control product selectivity. Selective CO production by photoelectrochemical methane oxidation is successfully demonstrated. Detailed experimental investigations revealed that a synergistic effect by adjacent Ti3+ sites is the key to CO formation
Thesis (PhD) — Boston College, 2018
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Nissen, Silke. "Remediation of water-borne pollutants and pathogens by photoelectrocatalysis." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25471.
Повний текст джерелаLi, Lihong. "Nanostructured Titanium Dioxide Photoelectrocatalysis Based Analytical Systems for Determination of Organic Compounds." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/365630.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Zu, Meng. "TiO2-based Photoelectrocatalysis Technology for Degradation and Detection of Organics in Wastewater." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/406505.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
Full Text
Gan, Wee Yong Chemical Sciences & Engineering Faculty of Engineering UNSW. "Synthesis and characterization of titanium dioxide thin films." Publisher:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/43310.
Повний текст джерелаGomes, Francisco Edvan Rodrigues. "Análise do propilparabeno e do butilparabeno em amostras de água da Bacia do Rio Pardo e estudos da sua degradação por fotólise e fotoeletrocatálise e avaliação da toxicidade e atividade estrogênica." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-20042016-160953/.
Повний текст джерелаBased on the dispersive Liquid-Liquid Microextraction technique (DLLME) developed an extraction methodology to analyze by High Performance Liquid Chromatography with Ultraviolet detection (HPLC-UV), the presence of propylparaben (PrP) and butylparaben (BuP) in the waters of the Pardo River Basin. The proposed method has a limit of detection and quantification of 62,60 and 187,60 µg /L of PrP and 58.40 and 175.20 µg /L for BuP. Analysis of the samples (18 samples) showed a content of 2.2 to 6.8 µg / L for the PrP and 1.9 to 4.9 µg / L for the Bup. In addition to analyzing the presence of parabens in the waters of the Pardo River, studied also the degradation of PrP, BuP and mixture PrP more BuP (PrP + BuP) for photolysis and photoelectrocatalysis techniques in deionized water solution and river water (Pardo River) at different concentrations (5, 10, 20 and 30 mg / L) and pH (4, 7 and 10). Removal of parabens in both techniques was greater than 98%. The degradation time in the photolysis ranged from 25 to 85 minutes while in photoelectrocatalysis was of 12 to 55 minutes, being the best conditions in deionized water and in acidic and neutral medium (pH 4 and 7). Analysis of Total Organic Carbon (TOC) of the solution photolysed in deionized water at different pHs (4, 7 and 10) showed to PrP, a removal of 16.3 25.25%. For BuP in the same sequence pH, the removal was 15 to 23.55%. In photoelectrocatalysis TOC removal for PrP in pH 4, 7 and 10 ranged from 33.3 to 36.5% whereas for BuP it was 35.2 to 38.3%.Cytotoxicity test showed that PrP, BUP and PrP-BuP mixture is nontoxic to the cells fibroblasts Balb / c 3T3 clone A31 before and after degradation, however are estrogenic for breast adenocarcinoma cells MCF-7. For the PrP, after photolysis and photoelectrocatalysis, it was completely abolished whereas for BuP and mixture (PrP + BuP), it was reduced but not completely eliminated.
Štefancová, Eva. "Kinetika elektrofotokatalytické dezinfekce vody." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401840.
Повний текст джерелаRoloff, Glauco Aurelio. "Degradação do hormônio estradiol por eletrólise, fotólise e fotoeletrocatálise." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-14042008-161820/.
Повний текст джерелаIn this project the use of three techniques was investigated: (i) electrolysis, (ii) photoelectrocatalysis and (iii) photolysis, in the degradation of the hormone estradiol, commonly found in the domestic sewers. This hormone can generate serious concerns with a disastrous action that can provoke in the wild and human life. The electrochemistry studies were accomplished on platinum and glassy carbon electrodes. The photoelectrocatalysis technique was applied using titanium plate covered with nanolayers of TiO2. As a source of ultra-violet radiation was used a lamp bulb of mercury vapor of 125 W for the photoelectrocatalysis as also in the photolysis. Through the studies of the oxidation of the estradiol by cyclic voltammetry, on the electrodes above mentioned, it was possible to define the oxidation potential of the organic specie in both solutions, KCl and phosphate buffers (pH 7), for platinum and glassy carbon. These parameters served as base for the realization of the electrolysis under controlled conditions. The photoelectrocatalysis of the estradiol was accomplished on Ti/TiO2 prepared by sol-gel technique and it was shown much more effective than the electrolyitc electrolysis. Finally, the photolysis was also tested being just used the mercury vapor lamp. In this last case the degradation of the estradiol was lightly inferior to that observed by photoelectrocatalysis It was identified that in solutions of KCl there is the hypochlorite formation, what aids the oxidation of the estradiol. Spectroscopy of UV-vis and high performance liquid chromatography (HPLC) were used to accompany the degradation processes. In spite of the appearance of bands and chromatographyc peaks owed to the formed products having been observed, however, it were not possible identify them.
Faber, Marcelo [UNESP]. "Tratamento fotocatalítico de corante ácido usando filmes finos de vidro/Ti 'O IND. 2' e degradação fotoeletrocatalítica de corante vat sobre eletrodos de filmes finos de Ti/Ti 'O IND. 2'." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105716.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Os estudos de degradação do corante VAT idantreno verde oliva foram realizados empregando-se solução 5x10-5 mol L-1 do corante em meio de NaCl 0,1 mol L-1 , pH=2,0 por meio do processo fotoeletrocatalítico sobre eletrodos de filmes finos de Ti/TiO2. Após 210 min de tratamento foi obtido 100% de descoloração e 86 % de mineralização. A aplicação do método fotocatalítico nas mesmas condições experimentais leva a apenas 60% de remoção do corante, indicando que o método fotoeletrocatalítico apresenta maior eficiência que a técnica de fotocatálise. A degradação do corante ácido vermelho 8 foi investigada através de processo fotoquímico empregando irradiação UV com lâmpada germicida de 4 W e lâmpada de mercúrio de 80 W. Foi observado significativa remoção da cor, porém análises de carbono orgânico total mostraram que o processo não apresenta nenhuma mineralização da matéria orgânica. Utilizando-se lâmpada de 80 W a degradação do corante ocorre segundo reação de pseudo primeira ordem com constante de velocidade de 0,0122 min-1 . A degradação do corante vermelho 8 é mais eficiente pelo processo fotocatalítico. A oxidação fotocatalítica de solução 5x10-5 mol L-1 do corante em meio de Na2SO4 0,1 mol L-1 , pH=6,0, sobre vidro/TiO2 promoveu 100 % de remoção da cor e aproximadamente 43 % de mineralização do corante. A eficiência fotocatalítica de filmes de TiO2 suportados em substrato de vidro obtidos pelo método dip-coating foi investigada testando-se a degradação do corante ácido vermelho em filmes obtidos variando-se os parâmetros: número de etapas de recobrimento, velocidade de deposição e temperatura de calcinação. O filme que mostrou maior eficiência fotocatalítica na degradação do corante ácido vermelho 8, foi construído com 1 depósito de TiO2, velocidade de recobrimento de 50 mm/min e temperatura...
Studies of degradation of the dye VAT Indanthrene olive green were performed using solution was 5x10-5 mol L-1 dye in NaCl 0.1 mol L-1 , pH = 2.0 through the process photoelectrocatalytic thin-film electrodes Ti/TiO2. After 210min of treatment was obtained 100% discoloration and 86% of mineralization. The application of the photocatalytic the same experimental condition leads to 60% removal of dye, indicating that the method photoelectrocatalytic is more efficient than the technique of photocatalysis. The degradation of acid red dye 8 was investigated by photochemical process using irradiation with UV germicidal lamp 4W and mercury lamp of 80W. Have been observed significant removal of color, but the analysis of carbon organic total no shows mineralization of organic matter. Using 80W lamp degradation of the dye is second reaction under pseudo first order rate constant of 0.0122 min-1 . The degradation of the red dye 8 is more efficient for the photocatalytic process. The photocatalytic oxidation of solution 5x10-5 mol L-1 dye in the midst of Na2SO4 0.1 mol L-1 , pH= 6.0 on glass/TiO2 promoted 100% removal of color and approximately 43% mineralization of the dye. The efficiency of photocatalytic TiO2 films supported on glass substrate obtained by dip-coating method was investigated by testing the degradation of acid red dye in films obtained by varying the parameters: number of steps of coating, deposition rate and temperature calcination. The film showed better photocatalytic degradation of dye Acid Red 8, was built with 1 deposit TiO2, coating speed of 50 mm/min and calcination temperature of 350°C film. Under these conditions the degradation of the dye second reaction is pseudo first-order rate constant of degradation of k = 0.121 min-1 . Therefore, it is concluded that the technique of photolysis and photocatalysis can be an excellent alternative to decolorize... (Complete abstract click electronic access below)
Bonancêa, Carlos Eduardo. "Estudo espectroscópico de processos de degradação fotoquímica e fotoeletroquímica de corantes." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-01032011-112239/.
Повний текст джерелаThis work focuses on the study of photocatalytic and photoelectrocatalytic degradation processes of dyes over titanium dioxide. The main approach is based on the use of spectroscopic techniques, with special emphasis to methodologies based on surface-enhanced Raman spectroscopy. Within this context, the mechanisms involved in the photodegradation and photoelectrodegradation of dyes are investigated by the identification of degradation intermediates through vibrational and electronic spectroscopies. In the so-called photoelectrocatalytic processes, the combination of electrochemical and photochemical processes is an interesting and promising approach for the degradation of a wide variety of organic pollutants. The first step in the development of the present work was to build a photo reactor that allowed the analysis of samples through Raman spectroscopy and presented a good efficiency for both photocatalytic and photoelectrocatalytic processes. We then investigated the kinetic behavior of the photo(electro)degradation of dyes in order to verify the dependence upon the electrochemical applied potential, the effect of the supporting electrolyte, and the identification of intermediate products formed during the degradation process. We also analyzed aspects related to the adsorption mechanisms of the dyes on the titanium dioxide surface. Such aspects can be relevant to the understanding and to the development of efficient techniques for the remediation of organic pollutants. Our studies focused mainly on two dyes: the azo dye Janus green and the anthraquinonic dye alizarin red S. The results obtained in the kinetic study of the photoelectrocatalytic processes suggest that the effect of the applied electrochemical potential strongly depends on the chemical nature of the investigated dye. We have observed that the decolorization of Janus green is favored for photoelectrocatalytic process as compared to the photocatalytic degradation. Such behavior was not observed for the anthraquinonic dye alizarin red S. This difference was related to the nature of the specific interactions between each dye and the catalyst surface. Our studies regarding the mechanisms of degradation revealed that the first steps of the photocatalytic and photoelectrocatalytic processes of Janus green followed different routes. The obtained results indicate that the degradation of Janus green in aqueous TiO2 suspension involves changes in the azo bond (N=N), resulting in the formation of an intermediate compound a derived from the phenosafranine structure, whereas for the photoelectrocatalytic process there are evidences of a different mechanism that does not involve the cleavage of the azo bond.
Faber, Marcelo. "Tratamento fotocatalítico de corante ácido usando filmes finos de vidro/Ti 'O IND. 2' e degradação fotoeletrocatalítica de corante vat sobre eletrodos de filmes finos de Ti/Ti 'O IND. 2'. /." Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/105716.
Повний текст джерелаBanca: Hideko Yamanaka
Banca: Mercedes de Moraes
Banca: Jeosadaque José de Sene
Banca: Denise Alves Fungaro
Resumo: Os estudos de degradação do corante VAT idantreno verde oliva foram realizados empregando-se solução 5x10-5 mol L-1 do corante em meio de NaCl 0,1 mol L-1 , pH=2,0 por meio do processo fotoeletrocatalítico sobre eletrodos de filmes finos de Ti/TiO2. Após 210 min de tratamento foi obtido 100% de descoloração e 86 % de mineralização. A aplicação do método fotocatalítico nas mesmas condições experimentais leva a apenas 60% de remoção do corante, indicando que o método fotoeletrocatalítico apresenta maior eficiência que a técnica de fotocatálise. A degradação do corante ácido vermelho 8 foi investigada através de processo fotoquímico empregando irradiação UV com lâmpada germicida de 4 W e lâmpada de mercúrio de 80 W. Foi observado significativa remoção da cor, porém análises de carbono orgânico total mostraram que o processo não apresenta nenhuma mineralização da matéria orgânica. Utilizando-se lâmpada de 80 W a degradação do corante ocorre segundo reação de pseudo primeira ordem com constante de velocidade de 0,0122 min-1 . A degradação do corante vermelho 8 é mais eficiente pelo processo fotocatalítico. A oxidação fotocatalítica de solução 5x10-5 mol L-1 do corante em meio de Na2SO4 0,1 mol L-1 , pH=6,0, sobre vidro/TiO2 promoveu 100 % de remoção da cor e aproximadamente 43 % de mineralização do corante. A eficiência fotocatalítica de filmes de TiO2 suportados em substrato de vidro obtidos pelo método dip-coating foi investigada testando-se a degradação do corante ácido vermelho em filmes obtidos variando-se os parâmetros: número de etapas de recobrimento, velocidade de deposição e temperatura de calcinação. O filme que mostrou maior eficiência fotocatalítica na degradação do corante ácido vermelho 8, foi construído com 1 depósito de TiO2, velocidade de recobrimento de 50 mm/min e temperatura... (resumo completo, clicar acesso eletrônico abaixo)
Abstract: Studies of degradation of the dye VAT Indanthrene olive green were performed using solution was 5x10-5 mol L-1 dye in NaCl 0.1 mol L-1 , pH = 2.0 through the process photoelectrocatalytic thin-film electrodes Ti/TiO2. After 210min of treatment was obtained 100% discoloration and 86% of mineralization. The application of the photocatalytic the same experimental condition leads to 60% removal of dye, indicating that the method photoelectrocatalytic is more efficient than the technique of photocatalysis. The degradation of acid red dye 8 was investigated by photochemical process using irradiation with UV germicidal lamp 4W and mercury lamp of 80W. Have been observed significant removal of color, but the analysis of carbon organic total no shows mineralization of organic matter. Using 80W lamp degradation of the dye is second reaction under pseudo first order rate constant of 0.0122 min-1 . The degradation of the red dye 8 is more efficient for the photocatalytic process. The photocatalytic oxidation of solution 5x10-5 mol L-1 dye in the midst of Na2SO4 0.1 mol L-1 , pH= 6.0 on glass/TiO2 promoted 100% removal of color and approximately 43% mineralization of the dye. The efficiency of photocatalytic TiO2 films supported on glass substrate obtained by dip-coating method was investigated by testing the degradation of acid red dye in films obtained by varying the parameters: number of steps of coating, deposition rate and temperature calcination. The film showed better photocatalytic degradation of dye Acid Red 8, was built with 1 deposit TiO2, coating speed of 50 mm/min and calcination temperature of 350°C film. Under these conditions the degradation of the dye second reaction is pseudo first-order rate constant of degradation of k = 0.121 min-1 . Therefore, it is concluded that the technique of photolysis and photocatalysis can be an excellent alternative to decolorize... (Complete abstract click electronic access below)
Doutor
Marien, Cédric. "Synthèse, caractérisation et réactivité de matériaux nanostructurés en TiO2 pour la dégradation photo(électro)catalytique du Paraquat." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF045/document.
Повний текст джерелаThe development of photo(electro)catalytic methods for the removal of organic pollutants requires the elaboration of supported TiO2 nanomaterials in order to simplify the recovery of the photocatalyst from treated effluents. Two different approaches were developed during this PhD thesis. The first approach consists in producing a thin film of TiO2 onto alveolar SiC foams. The TiO2/SiC assembly was then integrated into a tubular reactor surrounded by UV-C lamps. Many parameters were studied: number of lamps, the temperature, pollutant’s concentration (paraquat, weed killer) and the mechanical stability of TiO2/SiC foams. Then, paraquat’s by-products of degradation were identified. Another approach was then developed in order to improve the electron-hole pair of the photocatalytic process by applying a small electrical bias. For this purpose, the photocatalyst must be coated on a conductive surface. In this field, TiO2 nanotubes grown on titanium substrate by electrochemical synthesis in a fluoride media are very promising. Many parameters were studied in order to produce large electrodes and favor the upscaling. Photoelectrochemical properties of TiO2 nanotubes were studied and optimized especially concerning nanotube’s length. Besides, photoelectrocatalytic degradation of paraquat evidences that a small applied bias (0,5 to 1 volt) is enough to ensure optimal electron-hole separation. It was also demonstrated that the effluent conductivity also has a large influence on the photoelectrochemical performances
Kaeffer, Nicolas. "Construction de cathodes et photocathodes moléculaires pour la production d'hydrogène." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAV024/document.
Повний текст джерелаSolar fuels generated from the light-induced splitting of water into H2 and O2 is an appealing strategy for securing future energy. The use of platinum for catalyzing hydrogen evolution may be bypassed with earth-abundant catalysts. In a previous study, our lab realized the immobilization of a proton reduction catalyst, the cobalt diimine-dioxime molecular complex, within a cathode material steadily evolving H2 from fully aqueous media. In this work, we report on the implementation of this catalyst into light-driven devices. Operating conditions in the solvent of interest, water, were screened. The molecular catalyst degrades when free in solution, but retains activity when supported on an electrode, even in the presence of O2, and could thus be integrated into a tandem cell. Further on, new derivatives of the catalyst were developed for the attachment onto transparent conducting oxides. Co-grafted photocathodes were constructed by anchoring a functionalized catalyst along with photosensitizers onto p-type NiO. These architectures were checked by a whole set of analytical techniques and light-driven catalytic hydrogen evolution was achieved by photocathodes assessed under device-related photoelectrochemical conditions. Immobilizable dye-catalyst dyads were also successfully synthetized as alternative derivatives and open up new possibilities to develop molecular photocathodes
Hilliard, Samantha. "Photocatalyse de décomposition de l'eau : conception et construction d'une cellule photoelectrocatalyique pour la photodissociation de l'eau." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066034/document.
Повний текст джерелаSolar water splitting by photoelectrocatalysis is a proposed long term solution for the production of renewable hydrogen. A wired dual photosystem photoelectrocatalytic cell is thermodynamically considered to possess the highest attainable solar-to-hydrogen efficiency. To realize a photoelectrocatalytic water splitting cell for practical application, facile fabrication methods and abundant low cost materials are essential. This research investigates tungsten trioxide (WO3) and bismuth vanadate (BiVO4) as thin film n-photoanodes to complete the oxygen evolution half reaction for water splitting application in a tandem dual photosystem photoeletrocatalyic water splitting cell. These thin films are fabricated by low cost, robust, scalable, sol-gel dip coating methods and characterized by several techniques to verify the physical characteristics and photochemical performance. WO3 and BiVO4 are optimized by nanostructuration, interfacial surface modification, and addition of surface co-catalysts to increase performance and stability in acidic and neutral conditions, respectively. These materials are coupled with a copper (II) oxide p-photocathode to drive the hydrogen evolution reaction in a photoelectrocatalyic cell to complete the water splitting reaction. The photoelectrocatalytic cell constructed is inspired by previous literature reports encompassing an innovative tandem dual photosystem approach. As a result, this research reports one of the only entirely metal oxide based photoelectrocatalytic water splitting cells, fabricated by inexpensive, unexcessive techniques, resulting in a solar-to-hydrogen efficiency of 0.01% and an applied bias to photon efficiency of 0.06%
MOYA, Johan René González. "Nanotubos de TiO2 sensibilizados com quantum dots de CdS e suas aplicações para a geração de hidrogênio mediante fotocatálise e fotoeletrocatálise." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17768.
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CNPq
No presente trabalho foi investigado o desempenho de nanotubos de TiO2 sensibilizados com quantum dots de CdS na geração de hidrogênio por meio da reação de dissociação da água por meio da fotocatálise e fotoeletrocatálise. Os nanotubos de TiO2 foram obtidos pelo método de anodização (30 V, 1 hora) de chapas de Ti, em etilenoglicol e água contendo íons fluoreto. As amostras anodizadas foram submetidas a tratamento térmico 400°C durante 3 horas. Posteriormente as amostras foram sensibilizadas com quantum dots de CdS via síntese hidrotérmica in situ usando o ácido 3-mercaptopropiônico como agente estabilizante. A eficiência fotocatalítica dos materiais na produção de hidrogênio foi investigada por meio da reação de dissociação da água utilizando como fonte de irradiação um simulador solar. A quantificação do hidrogênio gerado foi determinada por meio de cromatógrafia gasosa. Por outro lado, para estimar a eficiência de geração de hidrogênio via fotoeletrocatálise, as amostras foram avaliadas como fotoânodos e medidas da fotocorrente gerada pela irradiação em uma célula fotoeletroquímica (PEC) de três eletrodos foram realizadas. A sensibilização dos nanotubos de TiO2 com os quantum dots de CdS a partir da síntese hidrotérmica in situ, permitiu uma boa impregnação e distribuição uniforme dos quantum dots ao redor da superfície dos nanotubos, de acordo com as análises de EDS e XPS. O perfil de profundidade de XPS mostrou que a concentração de CdS permaneceu praticamente inalterada (homogênea) ao longo da matriz nanotubular. A presença de ânions sulfato evidenciou a oxidação do material preferentemente na superfície. Os nanotubos conferem uma proteção ao CdS frente à oxidação e protegem também os quantum dots quanto à fotocorrosão na solução de sacrifício S2-/SO32- utilizada. Este comportamento define uma boa estabilidade na fotocorrente gerada como mostrado em experimentos de longa duração (20 horas) sob irradiação. Os resultados experimentais mostraram três comportamentos diferentes para a geração de H2 quando o tempo de síntese dos QDs de CdS aumenta. Foram observados, efeitos similares, antagônicos e sinérgicos frente à atividade fotocatalítica em relação aos nanotubos de TiO2. O efeito antagônico parece estar relacionado com a presença de duas populações de tamanhos de QDs de CdS, onde a população com um band gap menor atua como uma armadilha para os elétrons fotogerados pela população com um band gap maior, diminuindo a atividade fotocatalítica do TiO2 na região ultravioleta. A transferência de elétrons a partir dos QDs de CdS para o TiO2 foi comprovada pelos resultados de UPS combinados com as medidas do band gap óptico. A maior absorção no visível após a sensibilização com o CdS combinada com a transferência de elétrons possibilita um incremento na taxa de geração de hidrogênio por meio da fotocatálise a partir de luz visível de quase zero para os nanotubos de TiO2 até cerca de 0,3 μmol cm-2 h-1 após sensibilização com os QDs de CdS. No caso da fotoeletrocatálise em uma PEC, a taxa de geração de H2 a partir de luz visível estimada pela fotocorrente gerada após a sensibilização (1,79 μmol cm-2 h-1) chega a ser até 12 vezes maior que para os nanotubos de TiO2 sem sensibilizar (0,15 μmol cm-2 h-1).
In the present work, we investigated the performance of TiO2 nanotubes sensitized with CdS quantum dots on the photocatalytic and photoelectrocatalytic H2 production reaction. TiO2 nanotubes were obtained by anodization of Ti foil, followed by annealing to crystallize the nanotubes into anatase phase. Afterwards, the samples were sensitized with CdS quantum dots via an in situ hydrothermal route using 3-mercaptopropionic acid as the capping agent. This sensitization technique permits high loading and uniform distribution of CdS quantum dots onto TiO2 nanotubes. The XPS depth profile showed that CdS concentration remains almost unchanged (homogenous), while the concentration relative to the sulfate anion decreases by more than 80 % with respect to the initial value after ~200 nm in depth. The presence of sulfate anions is due to the oxidation of sulfide and occurs in greater proportion in the material surface. This protection for air oxidation inside the nanotubular matrix also protected the CdS from photocorrosion in sacrificial solution leading to good stability properties proved by a long duration photocurrent measurements. The effect of the sizes of CdS quantum dots attached to TiO2 nanotubes on the hydrogen production via photocatalysis was investigated. The experimental results showed three different behaviors when the CdS size is increased in the sensitized samples, e.g., similar, deactivation and activation effects on the hydrogen production with regard to TiO2 nanotubes. The deactivation effect was related with two populations of sizes of CdS, where the population with a shorter band gap acts as a trap for the electrons photogenerated by the population with a larger band gap. Electron transfer from CdS quantum dots to TiO2 semiconductor nanotubes was proven by the results of UPS combined with optical band gap measurements. This property facilitates an improvement of the visible-light photocatalytic hydrogen evolution rate from zero, for TiO2 nanotubes, to approximately 0.3 μmolcm-2h-1 for TiO2 nanotubes sensitized with CdS quantum dots. The hydrogen generation rate estimated from photocurrents measurements via photoelectrocatalysis in PEC systems was also investigated. The hydrogen generation rate after sensitization was improved from 0,15 μmol cm-2 h-1 to 1,79 μmol cm-2 h-1, near to 12 times better performance under visible-light irradiation.
Fabrão, Rodrigo Monteiro [UNESP]. "Oxidação fotoeletrocatalítica de glicose a compostos orgânicos com maior valor agregado empregando fotoeletrodos de nanotubos de dióxido de titânio." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143107.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A produção de etanol e açúcar a partir de cana-de-açúcar é um atividade de grande importância no Brasil, mas também fonte de grande preocupação ambiental devido ao grande acúmulo de biomassa na forma de bagaço e vinhaça gerados como rejeitos. A biomassa lignocelulósica é constituída de celulose, com estrutura formada de unidades de glicose polimerizadas, deste modo estudos voltados para a conversão de glicose em compostos químicos com maior valor agregado seria relevante para buscar novas formas de aproveitamento destes rejeitos. O objetivo do presente trabalho é investigar a aplicabilidade da técnica de fotoeletrocatálise para promover a oxidação de glicose em meio aquoso utilizando nanotubos de dióxido de titânio (NT-Ti/TiO2) como fotoanodos com vistas a obtenção de compostos com maior valor agregado. Os eletrodos de nanotubos de dióxido de titânio (NT-Ti/TiO2) foram preparados por oxidação eletroquímica de Ti em solução 1,0 mol L-1 de NaH2PO4 + 0,3% (m/m) HF como eletrólito de suporte sob potencial de 20V por 2 h e calcinado a 450 °C. Um método analitico baseado em cromatografia de troca iônica com detecção amperométrica foi desenvolvido para análise de glicose, acido glicônico, acido glicárico, arabitol e arabinose e curvas analíticas foram construídas em concentrações de 1,00 a 20,0x10-6 mol L-1, r = 0,9995, e o método alcançou limites de detecção e determinação ao redor de LD = 0,03x10-6 mol L-1 e LQ = 0,08x10-6 mol L-1 para a determinação de glicose. O método foi utilizado para monitoramento dos produtos gerados durante oxidação fotoeletrocatalítica de 10,0 mmol L-1 de glicose sob potencial de +1,5 V vs Ag/AgCl e irradiação UV/Vis que alcançou 72% de conversão após 180 min de tratamento. Medidas de remoção de carbono orgânico total mostraram que 28% da glicose foi convertida a CO2 e o restante foi transformado em outro produtos, tais como Arabinose, arabinitol, 4-cetoglicose, glucohexodialdose, glucona-δ-lactona, 6-desoxiglucose e o ácido glicônico, cuja maioria foi confirmada por espectrometria de massas. Os resultados demonstram que a técnica de fotoeletrocatálise pode ser uma alternativa simples, econômica e promissora para promover a conversão da glicose em alguns produtos de interesse econômico.
The production of sugar and ethanol from sugarcane is an activity very important in Brazil, but it is also a source of great environmental concern due to the large accumulation of biomass in form of bagasse and vinasse generated as waste of this process. The lignocellulosic biomass is made up of cellulose, wich structure is made of polymerized glucose units. Thereby studies focused on the conversion of glucose into added value chemical compounds would be relevant to seek new ways to use these waste. This work describes the construction electrodes of titanium dioxide nanotubes (NT-Ti / TiO2) and its application in photoeletrocatalytic oxidation of glucose in aqueous media aimed at converting glucose into compounds with higher added value. The electrodes were prepared by electrochemical oxidation of Ti in solution of 1.0 mol L-1 NaH2PO4 + 0.3% (m/m) HF as supporting electrolyte under a potential of 20V for 2 h and calcined at 450 ° C. An analytical method based on ion exchange chromatography with amperometric detection was developed for glucose, gluconic acid, glucarico acid, arabitol and Arabinose analysis and analytical curves were constructed at concentrations of 1.00 to 20,0x10-5 mol L-1, r = 0.9995, and the method achieved detection limits and determination around 0,03x10-6 mol L-1 and 0,08x10-6 mol L-1 for glucose determination, respectively. The method was used for monitoring the generated products due the oxidation photoeletrocatalytic 10.0 mmol L-1 glucose solution under potential of +1.5 V vs Ag / AgCl and irradiating UV / Vis that achieved 72% conversion after 180 min of treatment. Measurements of total organic carbon removal showed that 28% of the glucose was converted to CO2 and the rest was transformed into other products, such as arabinose, arabinitol, 4- ketoglicose, glucohexodialdose, Glucone-δ-lactone, 6-deoxyglucose and acid gluconic, most of which was confirmed by mass spectrometry. The results demonstrate that photoelectrocatalysis technique may be a simple, economical and attractive alternative to promote glucose conversion into some products of economic interest.
Curutchet, Antton. "Etude par DFT de photocatalyseurs pour des applications en photodissociation de l'eau." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN010/document.
Повний текст джерелаIn a society struggling to waive the use of fossil fuels, hydrogen production from water by solar photocatalysis is a alternative chemists have to consider. Setting up of this solutions asks to tackle two major issues : increase solar energy conversion by developing new semiconductors, and enhance the surface reactivity by developing efficient cocatalysts.First, DFT \emph{ab initio} calculations were carried out on a new family of semiconductor materials. Different key properties were computed and compared to experimental values. We showed that for a same material family, absorption can be controlled by changing the composition.Then, we focused on Oxygen Evolution Reaction (OER). For this reaction oxyhydroxides catalysts and their derivatives seem promising as both efficient and containing earth-abundant elements, but the understanding of its mechanism still remains unclear. On CoOOH model compound, we realised an extended analysis by a comprehensive study of intermediates and by explicit modelling of electrochemical potential. Our studies showed that taking into account several reactive sites is necessary to determine the OER mechanism on these catalysts' surface.Last, a preliminary study of biomass use was carried, in order to combine its valorization along with hydrogen production. The case of glycerol photoreforming is considered
Baccaro, Alexandre Luiz Bonizio. "Aperfeiçoamento de sistema de preparo de amostras em microescala por processamento fotoeletrocatalítico de matéria orgânica em célula eletroquímica irradiada com UV-LED, visando à análise de traços de metais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-28052012-104226/.
Повний текст джерелаThe photoelectrocatalysis process was investigated for the elimination of organic compounds interference on the electroanalysis of trace metals. Cu(II)-EDTA chelate was chosen as model system and the recovery of copper voltammetric peak, as effectiveness indicator. Thin layer cells (thickness of 600 micrometers) were designed for the treatment of some microliters of sample by irradiation (370 nm LED) of an electrode modified with TiO2 (P25, anatase rich). The following modified electrodes were prepared and evaluated: carbon paste with TiO2 and paraffin oil (CPE-TiO2), composites of graphite, TiO2 and epoxy or silicone binders and TiO2 occluded in electrodeposited gold on a gold substrate. The effect of parameters like potential bias, electrolyte composition and EDTA concentration on the photocurrent was evaluated to setup working conditions. Some correlations were observed, e.g., a linear dependence between photocurrent and EDTA concentration up to 1.0 mmol/L. For the irradiance applied, this concentration is possibly the upper limit of operation diffusion transport control, above which, the kinetics of the oxidation at the TiO2 modified electrode becomes the controlling process. For EDTA concentrations not exceeding 0.94 mmol.L-1, full recovery of 1.0 mmol.L-1 Cu(II) voltammetric peaks was observed after 10 min of irradiation. A faster procedure was discovered and consists in recording repetitive cyclic voltammograms (Au-TiO2 electrode, 0,3 to 0,7 V vs. Ag/AgCl scans, 100 mV.s-1) simultaneously with continuous irradiation. After the sixth cycle, the copper anodic stripping peak height stabilizes allowing quantification without previous sample pre-treatment step.
Araújo, Moisés Albuquerque de. "Síntese, caracterização e estudo das propriedades fotoeletrocatalíticas dos fotoanodos BiVO4 e BiVO4/FeOOH." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7833.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Among the variety of semiconductor materials investigated to apply in electrochemical cells bismuth vanadate (BiVO4) is one of the candidate which would be used as photoanode. Thus, this study aimed to synthesize thin films of BiVO4 and their modification with a thin layer of iron (III) oxyhydroxide (FeOOH) by photodeposition and study their photoelectrocatalytic properties. The optimization of BiVO4 synthesis condition was assessed by a factorial design 23 and an analysis of univariate type. The parameters studied were annealing temperature (500 and 600 °C), calcinations time (30, 60, 150 and 270 min.), solvent type employed for dissolving the BiVO4 precursor reagents (poly ethylene glycol 300-PEG 300, PEG 400, ethylene glycol-EG, mixture 1:1 by volume of PEG 300 and EG), deposition method of BiVO4 films (dropping and spin coating) and method of drying layers (heating at 500 °C, heat gun and no drying). From the optimized condition BiVO4 film was prepared by dissolving bismuth (III) nitrate and ammonium metavanadate in a mixture of 1:1 by volume of EG and PEG 300, it was deposited onto glass containing FTO by spin coating and then calcinated directly at 500 °C for 60 min. The photodeposition was carried out in the mixture FeSO4 and sodium citrate medium both 1 mmol L-1 and pH 4.7 by applying the open circuit potential for 5 min. and under light incidence. and then polarizing at 1.2 V for 1 min. BiVO4 and BiVO4/FeOOH films were characterized by XRD, SEM, EDS, UV-vis, voltammetry (cyclic and linear) and electrochemical impedance spectroscopy. The results reveled that photocurrent values increased 2.5 times at 0.71 V and the on set potential shifted to less positive value in the presence of FeOOH, also there was a considerable reduction of the charge transfer resistance in the interface photoanode/solution. The bare BiVO4 films were photostable during the illumination time studied which was 4 h. However, the modified films did not show the same behavior, the photocurrent value decreased 29% after 4 h illuminated. The results in the sulphite presence showed that photocurrent value for bare BiVO4 and BiVO4/FeOOH were less than the maximum photocurrent value which would achieve for this materias.
Dentre os diversos materiais semicondutores estudados para aplicação em células fotoeletroquímicas encontra-se o vanadato de bismuto (BiVO4), o qual pode ser utilizado como fotoanodo. Deste modo, o presente trabalho teve como objetivo principal a síntese de filmes finos de BiVO4 e sua modificação com uma fina camada de oxihidróxido de ferro (III) (FeOOH) por fotodeposição e avaliação das propriedades fotoeletrocatalíticas destes materiais. A otimização das condições de síntese do BiVO4 foi avaliada por um planejamento fatorial 23 e por uma análise do tipo univariada. Os parâmetros estudados foram temperatura de calcinação (500 e 600 °C), tempo de calcinação (30, 60, 150 e 270 min.), tipo de solvente empregado para dissolução dos reagentes precursores do BiVO4 (polietileno glicol 300-PEG 300, PEG 400, etileno glicol-EG, mistura 1:1 em volume de PEG 300 e EG), método de deposição dos filmes de BiVO4 (dropping e spin coating) e método de secagem das camadas dos filmes (aquecimento a 500 °C, soprador térmico e sem secar). Nas condições otimizadas o filme de BiVO4 foi preparado pela dissolução de nitrato de bismuto (III) e metavanadato de amônio em uma mistura de 1:1 em volume de EG e PEG 300, depositado sobre vidro contendo FTO por spin coating e depois calcinado diretamente a 500 ºC por 60 min. A fotodeposição foi realizada em meio da mistura FeSO4 e citrato de sódio ambos a 1 mmol L-1 e pH 4,7, aplicando-se o potencial de circuito aberto por 5 min. e com incidência de luz, seguida de polarização em 1,2 V por 1 min. Os filmes de BiVO4 e BiVO4/FeOOH foram caracterizados por DRX, MEV, EDX, UV-vis, voltametria (cíclica e linear) e espectroscopia de impedância eletroquímica. Os resultados mostram que na presença do FeOOH houve aumento de 2,5 vezes nos valores de densidade fotocorrente em 0,71 V e o potencial de on set deslocou-se para valores menos positivos, bem como uma redução considerável na resistência de transferência de carga na interface fotoanodo/solução. Os filmes de BiVO4 puro apresentaram-se fotoestáveis durante o tempo de iluminação estudado, 4 h. No entanto, os filmes modificados não apresentaram o mesmo comportamento, houve um decréscimo de 29% no valor de densidade de fotocorrente após 4 h de iluminação. O estudo na presença do sulfito mostrou que os valores de fotocorrentes para o BiVO4 puro e o BiVO4/FeOOH estão abaixo do valor máximo que se poderia obter para estes materiais.
Oliveira, Gisele Augusto Rodrigues de. "Comparação da eficiência do tratamento por fotoeletrocatálise em relação à cloração química convencional na redução da mutagenicidade de azo corantes empregando o ensaio de micronúcleos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/60/60134/tde-13042010-112953/.
Повний текст джерелаThe azo dyes Disperse Red 1, Disperse Orange 1 and Disperse Red 13 are widely used in dyeing processes and are mutagenic for Salmonella/microsome and micronucleus assays. The increasing of the complexity and difficulties for treatments of textile effluents has led to a constant search for new methodologies for the treatment of these wastewaters. Chlorination is a method extensively used for water and wastewaters disinfection and to remove or reduce the color of effluents in order to respect the standard of discharges issued by the Brazilian legislation. However, a lot of studies have shown that this treatment is not often able to remove the mutagenicity of the dyes, and in some cases it may even increase the toxicity of the sample. On the other hand, photoelectrocatalysis is apparently efficient both in the degradation of these compounds in aqueous samples and in reduction of the mutagenic activity, as demonstrated by some preliminary assays. This study aims to evaluate the efficiency of the photoelectrocatalysis treatment in the removal of the mutagenicity of the azo dyes Disperse Red 1, Disperse Orange 1 and Disperse Red 13 present in aqueous sample in comparison to conventional chemical chlorination using the micronucleus test (MNs) in HepG2 cells. The results showed that the frequency of MNs induced by different tested concentrations of the solutions of the studied dyes were not significantly different from the negative control. Our data also revealed that the cytokinesis-block proliferation index (CPBI) in cultures of HepG2 cells treated with the three dyes after chlorination and photoelectrocatalysis also showed no statistical differences related to the their respective negative controls. The comparative analysis of azo dyes chlorinated and photoelectrocatalysed Disperse Red 1, Disperse Orange 1 and Disperse Red 13 with the original dyes studied by our group (CHEQUER, 2008; CHEQUER et al., 2009) showed a decrease in the number of MNs indicating that after the treatments occurred the removal of the mutagenicity potencial at concentration of 1,0 µg/mL for the three dyes studied. Therefore, we conclude that conventional chemical chlorination and photoelectrocatalysis, under the conditions tested, are effective in removing of the mutagenicity of the azo dyes Disperse Red 1, Disperse Orange 1 and Disperse Red 13 related to induction of micronucleus.
Morávková, Eva. "Kinetika fotokatalytické a fotoelektrokatalytické degradace modelových polutantů bazénových vod." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449336.
Повний текст джерелаBatista, Grau Patricia. "Desarrollo de nanoestructuras de ZnO mediante anodizado electroquímico en diferentes condiciones para su aplicación en el área energética." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172606.
Повний текст джерела[ES] La presente Tesis Doctoral se centra en el desarrollo de nanoestructuras de óxido de zinc (ZnO) mediante anodizado electroquímico en diferentes condiciones para su aplicación en el área energética, en particular, en la producción de hidrógeno mediante la rotura fotelectrocatalítica de la molécula de agua. El hidrógeno es un vector energético que se plantea como solución al problema asociado a la intermitencia diurna y estacional de la energía solar y a la variabilidad en la demanda de energía. Por otra parte, el ZnO es un material semiconductor prometedor como fotocatalizador para la producción de hidrógeno debido a sus características y propiedades. En este contexto, el ZnO es un material muy abundante, y por extensión, relativamente barato, no es tóxico y presenta una energía de banda prohibida de 3,37 eV, lo que le permite la absorción de fotones en la región UV del espectro solar. Asimismo, las posiciones de sus bandas de energía son apropiadas para llevar a cabo la fotoelectrólisis del agua. En la presente Tesis Doctoral la síntesis de nanoestructuras de ZnO se llevó a cabo mediante anodizado electroquímico, puesto que este método presenta múltiples ventajas frente a otros métodos de síntesis habituales. En general, el anodizado electroquímico constituye un método rápido, sencillo y eficaz de síntesis de nanoestructuras de ZnO mediante el que es posible diseñar las características superficiales de las nanoestructuras (tamaño y morfología) a través del control de sus parámetros. Como resultado de una revisión bibliográfica en profundidad, se analizó la influencia de los parámetros del anodizado en las características superficiales de las nanoestructuras. Además, se investigaron aquellos parámetros cuya influencia todavía no había sido analizada. Por una parte, se estudió la influencia de emplear diferentes condiciones hidrodinámicas de flujo (dadas por la variación de la velocidad de rotación del electrodo). Por otra parte, se estudió la influencia conjunta de modificar el electrolito con la adición de un disolvente orgánico (etanol o glicerol en distintas proporciones) y variar la velocidad de rotación del electrodo. Las muestras de ZnO sintetizadas se sometieron a una caracterización morfológica, estructural, electroquímica y fotoelectroquímica y se estudiaron sus propiedades para ser empleadas como fotocatalizadores en la producción de hidrógeno. De acuerdo con los resultados, las diferentes condiciones de anodizado dieron lugar a diversas nanoestructuras de ZnO con diferentes características superficiales y fotoelectrocatalíticas. Así, se obtuvieron nanoestructuras de elevada área superficial con morfologías de nanocables de distintos tamaños, nanotubos, nanoesferas y nanoesponjas. Asimismo, tras el calentamiento térmico las muestras presentaron una estructura cristalina hexagonal wurtzita con elevada cristalinidad y la presencia de defectos estructurales. Igualmente, las nanoestructuras sintetizadas presentaron una elevada fotoactividad, dada por los valores elevados de densidad de fotocorriente, presentando propiedades apropiadas para su utilización en la producción de hidrógeno. La muestra que presentó el valor de densidad de fotocorriente más elevado (0,34 mA/cm2) fue la muestra de nanocables de ZnO anodizada a 0 rpm en un electrolito con un contenido en etanol del 10 % en volumen. En la aplicación de dicha muestra en la producción de hidrógeno se obtuvo un volumen teórico de hidrógeno de 1,55 litros por hora de sol y metro cuadrado de ZnO.
[CA] La present Tesi Doctoral se centra en el desenvolupament de nanoestructures d'òxid de zinc (ZnO) mitjançant anoditzat electroquímic en diferents condicions per a l'aplicació en l'àrea energètica, en particular, en la producció d'hidrogen mitjançant el trencament fotelectrocatalític de la molècula d'aigua. L'hidrogen és un vector energètic que es planteja com a solució al problema associat a la intermitència diürna i estacional de l'energia solar i a la variabilitat en la demanda d'energia. D'altra banda, el ZnO és un material semiconductor prometedor com a fotocatalitzador per a la producció d'hidrogen degut a les seues característiques i propietats. En aquest context, el ZnO és un material molt abundant, i per extensió, relativament barat, no és tòxic i presenta una energia de banda prohibida de 3,37 eV, la qual cosa li permet l'absorció de fotons a la regió UV de l'espectre solar. Així mateix, les posicions de les seues bandes d'energia són apropiades per a dur a terme la fotoelectròlisi de l'aigua. En la present Tesi Doctoral la síntesi de nanoestructures de ZnO es va dur a terme mitjançant anoditzat electroquímic, ja que aquest mètode presenta múltiples avantatges enfront d'altres mètodes de síntesi habituals. En general, l'anoditzat electroquímic constitueix un mètode ràpid, senzill i eficaç de síntesi de nanoestructures de ZnO mitjançant el qual és possible dissenyar les característiques superficials de les nanoestructures (grandària i morfologia) a través del control dels seus paràmetres. Com a resultat d'una revisió bibliogràfica en profunditat, es va analitzar la influència dels paràmetres de l'anoditzat en les característiques superficials de les nanoestructures. A més, es van investigar aquells paràmetres la influència dels quals encara no havia sigut analitzada. D'una banda, es va estudiar la influència d'emprar diferents condicions hidrodinàmiques de flux (donades per la variació de la velocitat de rotació de l'elèctrode). D'altra banda, es va estudiar la influència conjunta de modificar l'electròlit amb l'addició d'un dissolvent orgànic (etanol o glicerol en diferents proporcions) i variar la velocitat de rotació de l'elèctrode. Les mostres de ZnO sintetitzades es van sotmetre a una caracterització morfològica, estructural, electroquímica i fotoelectroquímica i es van estudiar les seues propietats per a ser emprades com fotocatalitzadors en la producció d'hidrogen. D'acord amb els resultats, les diferents condicions d'anoditzat van donar lloc a diverses nanoestructures de ZnO amb diferents característiques superficials i fotoelectrocatalítiques. Així, es van obtindre nanoestructures d'elevada àrea superficial amb morfologies de nanocables de diferents grandàries, nanotubs, nanoesferes i nanoesponges. Així mateix, després del calfament tèrmic les mostres van presentar una estructura cristal·lina hexagonal wurtzita amb elevada cristallinitat i la presència de defectes estructurals. Igualment, les nanoestructures sintetitzades van presentar una elevada fotoactivitat, donada pels valors elevats de densitat de fotocorrent, presentant propietats apropiades per a la seua utilització en la producció d'hidrogen. La mostra que va presentar el valor de densitat de fotocorrent més elevat (0,34 mA/cm²) va ser la mostra de nanocables de ZnO anoditzada a 0 rpm en un electròlit amb un contingut en etanol del 10% en volum. En l'aplicació d'aquesta mostra en la producció d'hidrogen es va obtindre un volum teòric d'hidrogen de 1,55 litres per hora de sol i metre quadrat de ZnO.
[EN] This Doctoral Thesis focuses on the development of zinc oxide (ZnO) nanostructures by electrochemical anodization under different conditions for its application in the energy area, in particular, in the production of hydrogen through photoelectrochemical water splitting. Hydrogen is an energy vector that is proposed as a solution to the problem associated with the diurnal and seasonal intermittency of solar energy and the variability in the energy demand. On the other hand, ZnO is a promising semiconductor material as a photocatalyst for hydrogen production due to its characteristics and properties. In this context, ZnO is a very abundant material, and by extension, relatively cheap, it is non-toxic and has a band-gap energy of 3.37 eV, which allows it to absorb photons in the UV region of the solar spectrum. Besides, the positions of ZnO energy bands are appropriate to carry out photoelectrochemical water splitting. In the present Doctoral Thesis, the synthesis of ZnO nanostructures was carried out by electrochemical anodization, since this method has multiple advantages compared to other common synthesis methods. In general, electrochemical anodization constitutes a fast, simple, and effective method of synthesis of ZnO nanostructures by means of which it is possible to design the surface characteristics of the nanostructures (size and morphology) by controlling anodization parameters. As a result of an in-depth bibliographic review, the influence of anodization parameters on the surface characteristics of nanostructures was analyzed. In addition, those parameters whose influence had not yet been analyzed were investigated. On the one hand, the influence of using different controlled hydrodynamic conditions (given by the variation of the rotation speed of the electrode) was studied. On the other hand, the influence of both modifying the electrolyte with the addition of an organic solvent (ethanol or glycerol in different proportions) and varying the electrode rotation speed was studied. The synthesized ZnO samples were subjected to a morphological, structural, electrochemical and photoelectrochemical characterization and their properties were studied to be used as photocatalysts in hydrogen production. According to the results, the different anodization conditions gave rise to various ZnO nanostructures with different surface and photoelectrocatalytic characteristics. Thus, high surface area nanostructures were obtained with morphologies of nanowires of different sizes, nanotubes, nanospheres and nanosponges. Likewise, after thermal annealing the samples presented a wurtzite hexagonal crystalline structure with high crystallinity and the presence of structural defects. Likewise, the synthesized nanostructures presented high photoactivity, given by the high values of photocurrent density, presenting appropriate properties for their use in the production of hydrogen. The sample that presented the highest photocurrent density value (0.34 mA / cm2) was the ZnO nanowires anodized at 0 rpm in an electrolyte with an ethanol content of 10 % by volume. In the application of this sample in the hydrogen production, a theoretical volume of hydrogen of 1.55 liters per hour of sun and square meter of ZnO was obtained.
Authors would like to express their gratitude for the financial support to the Generalitat Valenciana and to the European Social Fund within the subvention to improve formation and employability of technical and management staff of I+D (GJIDI/2018/A/067) and for its financial support through the project: IDIFEDER/018/044. Authors also thank for the financial support to the Ministerio de Economía y Competitividad (Project Code: CTQ2016-79203-R) and to the Ministerio de Ciencia e Innovación-Agencia Estatal de Investigación (Project Code: PID2019-105844RB-I00) for its help in the Laser Raman Microscope acquisition (UPOV08-3E- 012) and for the co-finance by the European Social Fund.
Batista Grau, P. (2021). Desarrollo de nanoestructuras de ZnO mediante anodizado electroquímico en diferentes condiciones para su aplicación en el área energética [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172606
TESIS
Compendio
Martins, Alysson Stefan. "Síntese e caracterização de eletrodos de TiO2/WO3, nanotubos de TiO2/WO3 e nanotubos de TiO2/titanato para aplicação no tratamento fotoeletrocatalítico dos interferentes endócrinos bisfenol-A e propil." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-16012018-094702/.
Повний текст джерелаEffective technologies for the water and wastewater treatment represent a challenges for our society; among the options, the photoelectrocatalysis can be considered a promising and interesting alternative. In this context, the objective of this study was to develop modified TiO2 electrodes for the photoelectrocatalytic treatment of endocrine disruptors. The synthesis of TiO2 nanotubes (TiO2-NT) on metallic Ti substrate was carried out via electrochemical anodization in NaH2PO4 /HF electrolyte. In order to minimize the limitations inherent of TiO2, the electrodeposition of WO3 was performed on the TiO2 nanotubes (Ti/TiO2-NT/WO3) and also in the metallic Ti substrate. The deposition on the Ti metallic produced a thin layer of TiO2 on the surface, subsequent to the heat treatment, generating a composite (Ti/TiO2/WO3). The X-ray diffraction analysis (XRD) confirmed the monoclinic phase of WO3 for both the syntheses and the anatase phase of TiO2 for the Ti/TiO2-NT/WO3 electrodes. For the two syntheses, the X-ray dispersive energy (EDX) analisys indicated an increasing amount of tungsten (W) in the composition of the electrodes with increasing of electrodeposition time. High W content (above 1.2%) showed a significant decrease in the photocurrent values. However, low content of W (between 0.4 and 1.2 %) indicated an increase of 20 % in the photocurrent values for the electrodes Ti/TiO2-NT/WO3 (20 mA cm-2) and Ti/TiO2/WO3 (17 mA cm-2) compared to the unmodified ones, at the potential of +2.0 V. Difuse reflectance analysis indicated low bandgap energy (≈ 2.90 eV, Ti/TiO2-NT/WO3 electrodes) and an increase in the UV-Vis irradiation absorption. The best electrodes modified with WO3 to the both syntheses were applied in the photoelectrocatalytic oxidation (PEC) of bisphenol-A (BPA) and propylparaben (PPB) compounds, under UV-Vis irradiation. The PEC method presented an excellent performance in acidic conditions, applying a bias potential of +1.50 V and +0.50 V for Ti/TiO2-NT/WO3 and Ti/TiO2/WO3 electrodes, respectively. The mineralization of BPA and PPB compounds was greater than 80% for both Ti/TiO2-NT/WO3 and Ti/TiO2/WO3. In relation to the removal rate, BPA and PPB were completely removed after 45 and 60 min, respectively, for Ti/TiO2/WO3 electrodes and after 30 minutes for Ti/TiO2-NT/WO3 electrodes. Additionally, the electrodes presented a low energy consumption and good chemical stability. Compared to the photocatalysis (PC), the PEC was 2 times higher to the mineralization efficiency for Ti/TiO2-NT/WO3 and almost 20% higher for Ti/TiO2/WO3. Thus, the modifications of the TiO2 electrodes with WO3 represent an important contribution to the performance of materials and, therefore, a positive step for the application in alternative treatments of decontamination of wastewater. It was also of interest in this work to propose a new method for the insertion of nanotubes (TiNT) and nanosheets (TiNS) of titanates inside of TiO2 nanotubes via electrophoretic deposition. In this study was developed a simple and efficient method for the modification of complex nanostructures. The movement of the counter electrode on the surface of the working electrode, adapted with a brush on the edges, reduced the thickness of the TiNS/TiNT layer. The potential applied (20 V) and the mechanical stimulation in the surface were important for the incorporation of TiNS/TiNT into the pores of TiO2-NTs. As a result, the electrodes increased the hydrophobicity and an improvement to the direct oxidation capacity compared to the unmodified electrode.
Gross, Pierre-Alexandre. "Modification de nanotubes de TiO2 pour la production d’hydrogène par photodissociation de l’eau sous lumière solaire." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF053.
Повний текст джерелаThis work is about the production of hydrogen by photoelectrocatalysis using a vertically aligned TiO2 nanotubes based photoanode. Utilization of TiO2 for solar applications is limited due to its large band gap, it has to be modified. Two approaches are proposed for the modification of the TiO2 nanotubes to make them absorb visible light. The first one is the chemical modification of the TiO2 by (Ta-N) or (Nb-N) cationic-anionic co-doping. Cations are inserted during the growth of the nanotubes by a novel approach, and nitrogen is inserted during heat treatment. This leads to the formation of hybrid orbitals resulting in a band gap reduction and of activity under visible light. The second approach consists of the deposition of Ag nanoparticles on the surface of the TiO2 nanotubes. Thanks to the control of the morphology of the Ag nanoparticles, their plasmonic resonance can enhance the absorption of TiO2 and thus increase its activity both under UV and visible light
Ferraz, Elisa Raquel Anastácio. "Avaliação da eficiência do tratamento com fotoeletrocatálise e cloração convencional na remoção dos azo corantes Disperse Orange 1, Disperse Red 1 e Disperse Red 13 de amostras aquosas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/60/60134/tde-28032012-090020/.
Повний текст джерелаThe azo dyes are currently considered as a concern regarding the environmental and public health, since when released in industrial effluents they pollute the environment. Unfortunately, the conventional method of treatment of textile effluents is not able to effectively remove both dyes and their toxicity. Within this context, this study aimed to evaluate the effectiveness of the treatment of aqueous samples by photoelectrocatalysis compared to conventional chlorination as an alternative method of degradation of azo dyes, using the dyes Disperse Orange 1, Disperse Red 1 and Disperse Red 13 as a model. Additionally, we evaluated the cytotoxicity of the original dyes using HepG2 cells and chondrocytes cultured in monolayer and in 3D. To this end, solutions of these original dyes, chlorinated and photoelectrocatalysed were evaluated using tests of genotoxicity / mutagenicity, cytotoxicity and ecotoxicity. All the dyes, original and chlorinated, were genotoxic to HepG2 cells in the comet assay. For the test with Salmonella, chlorination reduced the mutagenicity of the dyes for the YG1041 strain and increased the effect for the TA98 strain, except Disperse Red 13, which had the mutagenic effect reduced for both strains after chlorination. The photoelectrocatalysis removed both genotoxicity and mutagenicity. Only Disperse Orange 1 induced apoptosis by annexin V assay, but this cytotoxicity was removed after treatment. The dye Disperse Red 1 and Disperse Red 13 were toxic to D. similis while only the Disperse Red 1 was toxic to V. fischeri, and the treatment by chlorination and photoelectrocatalysis decreased the toxicity showed. The dyes Disperse Orange 1 and Disperse Red 13 began toxic to V. fischeri after chlorination, and the photoelectrocatalysis of the Disperse Red 13 generated toxic products for this organism. So, while it is a promising treatment method, attention should be given in the evaluation and application of photoelectrocatalysis as an alternative to chlorination. The dyes Disperse Orange 1 and Disperse Red 13 decreased the mitochondrial activity of chondrocytes, and the dye Disperse Red 13 also decreased the production of lactate. All the dyes reduced the mitochondrial activity of the HepG2 cells cultured in monolayer, while the Disperse Orange 1 did no show this effect in 3D. Only Disperse Red 13 decreased the activity of dehydrogenases of HepG2 cells and this effect was observed both in monolayer and in 3D.
Yuh-Fan, Su, and 蘇昱帆. "Photoelectrocatalytic Reaction of Methyl Orange on Semiconductors." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/60944884068279134551.
Повний текст джерела國立成功大學
化學工程學系
88
Titanium dioxide is widely applied in photocatalysis to carry out the redox reaction. Recently, the usage of photoenergy is a significant subject of study in photocatalytic reaction. The usage of photoenergy of tungsten oxide is larger than titanium dioxide due to its smaller energy band-gap. However, the recombination of electron hole pair owing to inadequate reduction potential of conduction band of tungsten oxide results in bad phototcatalysis performance. In this study, using bias potential to improve tungsten oxide photocatalytic capability is investigated. Meanwhile, the influence of the electrode preparation condition and photoelectrocatalytic reaction factors is discussed. The photocatalyst electrode was prepared by deposited the semiconductor on conductive substrate with reactive sputtering. XRD, SEM, Potentiostat/Galvanostat, UV/VIS sepectrophotometer, and profilometer were used to analyze the characteristics of photoelectrode. An Arc lamp for simulating ultraviolet of sunlight used to induce photoelectrocatalytic decolorization of methyl orange. Mehtyl orange is an azo compound in dye wastewater. The prepared TiOx/Ti and WOy/Ti electrode show the excellent crystal structure without calcination. The TiOx film prepared by reactive sputtering is very uniform and it presents a slight blue shift. The blue shift effect means the photocatalyst is needed UV light with larger energy to excite electron hole pair. The best photocurrent of the TiOx/Ti electrode was obtained at the deposited condition with 300 W sputtering power and 3.2´10-2 mbar total sputtering pressure containing 25 % oxygen partial pressure. The results indicate that WOy/Ti film electrode also has excellent photoactivity by applying a bias potential and irradiation simultaneously. Decolorization of methyl orange proceeded through oxidation reaction promoted by the hydroxyl radical (OH·) that was generated from the reaction of holes and hydroxyl groups or water adsorbed on the surface of WO3. Decolorization of methyl orange proceeded through reduction reaction promoted by the electron is not observed. The photoactivity of WOy/Ti film electrode decreases quickly in the alkaline solution due to the WO3 was dissolved. The pH value of the aqueous solution, concentration of methyl orange, and bias potential are the major factors affecting the photoelectrocatalytic decolorization of methyl orange but the effect of power of UV light is minor. The photocurrent efficiency is evaluated by the ratio of concentration change of methyl orange and photocurrent. The photocurrent efficiency is about 1.2% and 12% in alkaline and acidic solution, respectively. The low photocurrent efficiency results from deactivation of hydroxyl radical. Increasing bias potential results in higher reaction rate and lower photocurrent efficiency. Based on the experiment results, the mechanism of photoelectrocatalytic reaction is proposed and a semitheoretical kinetic rate equation is obtained. Theoretical analysis ones correlate well with experimental results. The rate determined step is methyl orange reacted with hydroxyl radical. Langmuir- Hinshlewood adsorption of methyl orange is suitable to this system. The semitheoretical kinetic rate equation is represented as following (I-1) where Ri is decolorization rate of methyl orange (mM/min). P, E, and [MO] represent power of UV light, applied bias potential, and concentration of methyl orange, respectively. a and b are the reaction order of power of UV light and applied bias potential, respectively. The value of rate constants including Kp, K’, and K6 calculated from experimental data are
Chen, Hsin-tien, and 陳忻恬. "Preparation and Photoelectrocatalytic Properties of ZnO Nanorod." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61987477743532170184.
Повний текст джерела國立臺灣科技大學
化學工程系
96
Zinc oxide nanorods (ZNR) on substrate were prepared in this study by chemical bath deposition method. In order to obtain ZNR of high aspect ratio and high photocatalytic activity of ZNR, we added polyethylenimine (PEI) and Ag were added. PEI was used to hinder the lateral growth of the nanorods. All the catalysts prepared in this study were characterized by XRD, SEM, UV-vis, and AA. The photocatalytic activity of ZNR arrays was measured by photobleaching of 10 mg/L methylene blue, in a photo-reactor equipped with a light of 128 W and λmax=300 nm. The efficiency of photoconversion of ZNR was evaluated by 100 W Xe arc lamp illuminating the work-electrode in 1 M KOH solution. As the synthesis time increased from 5 to 20 hours, the results showed that, the length of the ZNR increased from 3.3μm to 12.4μm , the diameter increased from 100 nm to 400 nm, the average aspect ratio was about 34. Adding PEI to the synthesis solution would increase the aspect ratio to 60. For ZNR of 10μm length, the photobleaching activity of ZNR prepared with the addition of PEI is higher than that of zinc oxide nanoparticles film (ZNP). The most active photocatalytic catalyst was prepared by adding PEI in the synthesis solution and with the incorporation of Ag. The same catalyst also had the highest efficiency of photoconversion and incident monochromatic photo-to-current conversion in water splitting reaction.
HSU, YUNG-HSIANG, and 徐詠祥. "Photoelectrocatalytic properties of titanium dioxide/silver nanowire hybrid films." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b23az4.
Повний текст джерела國立雲林科技大學
化學工程與材料工程系
107
With respect to photocatalysis, titanium dioxide plays an important role in the degradation of pollution. Some studies also used electrocatalytic techniques to remove pollutants. Since both photocatalysis and elelctrocatalysis can remove efficiently pollutants, the study aims to combine them on removal of pollutants. In this work, we prepared silver nanowires by the polyol synthesis method and used such silver nanowires to prepare transparent conductive films. A titanium oxide layer was deposited on the transparent conductive films of silver nanowires to form bi-layer TiO2/AgNW films. For photoelectrocatalytic experiments, we used methylene blue as a pollutant and applied a bias voltage between the TiO2/AgNW film and a counter electrode. The effect of thickness of the TiO2 layer, silver nanowires, and forward/reverse bias on photoelectrocatalysis was investigated. The hydroxyl free radicals were analyzed through reaction of terephthalic acid and measurement of fluorescence. Experimental results revealed that the TiO2/AgNW film working as an anode showed significant catalytic activity on the degradation of methylene blue under a 0.5 V bias.
FangShih-Hao and 方世豪. "Photoelectrocatalytic Degradation of Acid Orange 7 on TiO2 / SnO2 Electrode." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/13619355829416590478.
Повний текст джерела崑山科技大學
環境工程研究所
93
The photoelectrochemical (PEC) bleaching of a textile azo dye, acid orange 7 (AO7), on TiO2 or TiO2/SnO2 thin film electrodes prepared by a modified sol-gel method irradiated by xenon or visible light were carried out. The (112) and (110) were the preferred orientations for the anatase and rutile phases of TiO2, respectively. A synergetic effect between rutile and anatase phases on the PEC efficiency was revealed. The particle sizes of TiO2 and TiO2/SnO2 were estimated to be ca. 30nm by FESEM after calcination at 500℃, but the aggregation between particles was also accompanied. Incorporation of SnO2 can prevent TiO2 from aggregation, diminish the particle size and reduce the temperature, at which anatase phase changed into rutile phase. The TiO2/SnO2 electrodes, calcinated at 600℃, with TiO2/SnO2 of 9:1 to 7:3 explored higher performance than other compositions. An optimum thickness of the oxide film was needed to achieve maximum PEC efficiency. The bleaching rate of AO7 in the acidic solution is superior to that in the basic solution by PEC method. The Langmuir-Hinshelwood model can be adopted to describe the adsorption of AO7 on the electrode; however, it can not be simplified to a pseudo first order reaction due to larger AO7 concentration and/or lower surface area of the electrode. TiO2/SnO2 with Ti/Sn of 9:1 exhibited high bleaching rate of AO7 under visible light. Impregnating TiO2/SnO2(7:3) electrode with ethanol followed by calcination significantly enhanced the photodegradation rate of AO7 under visible light inadiation. The decolorization of AO7 may be partly originated from the hydroxyl radical attacking, and partly resulted from the photosensitization by AO7 itself and/or carbon residues followed by the electrons transferring to the electrode.
Yu, Sheng-Lin, and 游昇霖. "Reduction of Cr(VI) in Aqueous Solution by Photoelectrocatalytic Processes." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69806997472211008549.
Повний текст джерела國立臺灣科技大學
化學工程系
102
In this study, the photoelectrocatalytic reactor constructed by the structure design of batch reactor was used for the photoelectrocatalytic reduction of hexavalent chromium (Cr(VI)) in aqueous phase. The photocatalytic properties of photocathodes with different TiO2 thickness are examined. The experimental results indicated that the 6.50 μm thickness of TiO2 film shows the highest photocatalytic activity among all the thickness investigated. The effects of solution pH, light intensity, initial Cr(VI) concentration, periodic illumination, bias potential and driving modes of bias potential were investigated on the photocatalytic and photoelectrocatalytic processes. The kinetics parameters of photocatalytic reduction of aqueous Cr(VI) was studied and discussed. The photocatalytic reduction of Cr(VI) for experiments conducted with periodic illumination were higher than that conducted with continuous illumination at pH 2. Because the surface fractional coverage is higher than replenished surface coverage of concentration of hydroxide and oxygen during long illumination period. Therefore, the photocatalytic reduction of Cr(VI) became slower at the long illumination period. The extent of electrolytic reduction was increased with decreasing applied bias potential. The bigger negative value of bias potential which provided more electron to reduce Cr(VI). Reduction of aqueous Cr(VI) was efficiently enhanced by photoelectrocatalytic process because the photoinduced electrons efficiently accumulate on TiO2-coated photocathode. The driving mode of half-rectified square wave mode (HR-SW) for electrolytic reduction also was investigated. However, the reduction of Cr(VI) under HR-SW mode was lower than which with constant DC mode when the negative bias potential. It is considered that when turning the bias potential from negative value to zero, the electrons which accumulating on the surface of cathode are drown to anode via external circuit under HR-SW mode.
Tien, Chao-Cheng, and 田照正. "Photoelectrocatalytic Degradation of Dyes using Graphene Composite Titanium Dioxide Electrodes." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/23723560957186331834.
Повний текст джерела朝陽科技大學
環境工程與管理系
102
The ultrasonic and Hummers method were used in this study to prepare graphene oxide. The cyclic voltammetry was used for reduction of graphene oxide to graphene and deposition of graphene on the TiO2 nanotube array film. Thus, the graphene composited TiO2 nanotube array film was prepared. The photoelectrocatalysis of dye solution and its degradation efficiency was implemented with visible light and UV. The open-circuit voltage, closed circuit current and AC impedance of electrochemical analysis were implemented. The results showed that the dye degradation efficiency of the graphene composite TiO2 nanotube array film in UV-irradiation is better than that of TiO2 nanotube array film. With bias of 1 V, the addition of 0.1 M potassium chloride resulted in the optimum photoelectrocatalytic degradation efficiency. The degradation efficiency is still good when the methyl orange solution concentration is increased to 30 mg/L. The photocurrent of graphene composite TiO2 nanotube array film was increased compared with TiO2 nanotube array film. The results proving that the graphene composite TiO2 nanotube array film can increase the overall photoelectrocatalytic efficiency. In the same way, photocatalysis and photoelectrocatalysis of methyl orange solution with the visible light showed that the graphene composite TiO2 nanotube array film also has better catalytic efficiency than TiO2 nanotube array film.
CHO, FENG-HSUAN, and 卓逢軒. "High efficiency Photoelectrocatalytic formic acid oxidation on Pt-modified dendritic gold." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7hv833.
Повний текст джерела東海大學
化學系
105
The deposited gold dendrites (Au-Ds) on the GC electrode shows a three-fold symmetric structure, which grows all along the <111> direction. Due to crystalline Au-Ds have special texture nano structures, such as sharp edges or tips, high surface areas, and junctions between neighboring tips, which brought potential applications in catalysis. In addition, surface plasmon resonance (SPR) effect of Au-Ds can provide a beneficial electric field nearby to facilitate the separation of photo-excited carriers and to enhance the photoelectrocatalytic performance. We select copper under-potentials deposition (UPD) and platinum redox replacement technique to prepare Pt sub-monolayer on Au-Ds surface. Using two kinds of Pt(II, IV) precursors and controlling redox times to adjust Pt amounts and coverage on Au-Ds. Electrochemical activity surface areas (EASA) of Au-Ds is 50.40 cm2. For AP(II)-f substrates, Pt has 54 % coverage and EASA of Pt is 10.86 cm2. The multifunctional utilities of Au-Ds effective to sub-monolayer Pt durability and photo-absorption benefit the promotion of photocatalytic activity and stability. AP(IV)-i can restrict FAOR to perform on direct pathway. What is more, under irradiation, the ratio of P1/P2 can achieve 13.12 and current density of EASAPt can reach 12.1 mA/cm2. Besides, when AP(IV)-f under irradiation with CA at 0.35 V, the current density can increase to 26.65 %.
Chang, Chia-Hao, and 張家豪. "Photoelectrocatalytic degradation of aqueous ammonia using TiO2 by Anodization and Immobilization." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/83333495986898911317.
Повний текст джерела國立勤益科技大學
化工與材料工程系
103
In this study, two different substrates (titanium sheet, titanium mesh) were prepared by using anodic oxidation and immobilization. On the other hand, discussion two substrates (titanium sheet, titanium mesh) were prepared by using anodic oxidation and immobilization with different pH values, ammonia removal efficiency of the bias potential. The results show that the prepared by using immobilization(Catalyst amount is 0.413g) at pH values 7.5 and bias potential is 2.0V have the best efficiency of 70.13%, when the pH is higher than the titanium dioxide pHpzc, NH4+ easier to adsorbed on the surface of titanium dioxide, so the reaction faster. At pH values 7.5 and bias potential is 1.5V has efficiency of 68.1% Considering the energy conservation issues and efficiency not differ much, therefore, as a condition of bias potential of 1.5V. Titanium mesh was prepared by using anodic oxidation and immobilization degradation solution of ammonia + anion and cation ions in different concentrations,observed any change and the impact of the target pollutant degradation effect. the results show that titanium mesh was prepared by using a immobilization degradation solution of ammonia + 1.5M phosphoric acid have the best efficiency of 81.90%.
Wang, Yu-Jyun, and 王瑜鈞. "Photoelectrocatalytic Degradation of Sulfadiazine by TiO2 Composited with Nano-carbon Material." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/98899122544944080710.
Повний текст джерела國立高雄第一科技大學
環境與安全衛生工程研究所
103
This study aimed to investigate both photocatalysis (PC) and photoelectrocatalysis (PEC) of typical sulfonamides under illumination of near-UV (l= 365 nm) or LED blue light (l= 470 nm) by using TiO2/Ti composite thin-films as photocatalysts. The photocatalyst were prepared with EPD electrophoretic deposition processes by compositing P-25 TiO2 powder with carbon nano tube (CNT) and graphene plates. Sulfadiazine (SZD), a widely using antibiotic but concerned as an emerging contaminant, was tested as a target compound. Three major types of TiO2 composite thin-film photocatalysts including bare TiO2, carbon nanotubes doped TiO2, and graphene doped TiO2 on pure Ti substrates were prepared in the study. Other than investigating decomposition rate of SDZ, both physical and chemical properties of these prepared photocatalysts including absorption spectra, surface morphology and crystallinity were also measured by UV-Vis、SEM、TED、EDS and XRD. This study also measured flat-band potential of the prepared photocatalysts for correlating their oxidation capabilities with SDZ degradation rates. Several reacting variables including solution pH levels (pH= 7), applied external bias (0 to 1.0 V), types of photocatalysts and light sources (l= 365 nm and l= 470 nm) were examined in the study. All of tests were conducted in a bench-scale photoelectrocatalytic reactor. The experimental results indicated that the SDZ degradation rate was enhanced with increasing applied bias. Higher SDZ degradation rate was achieved by PEC reaction than by simple PC reaction. In comparison of simple PC reaction, the SDZ degradation rate could be increased up to 5.5 times by the PEC reaction. In addition, it was observed that the carbon nanotubes doped TiO2 and graphene doped TiO2 had a higher degradation rate for SDZ than the simple TiO2 sample. More hydroxyl radicals were expected to be produced by the TiO2 after doping with carbon nanotubes or graphene plates. It was also found that more visible light could be adsorbed by TiO2 while composited with nano carbon material, causing fast decomposition of SDZ under illumination of LED blue light. This study successfully demonstrates the enhanced photocatalytic degradation rate of typical antibiotic, SDZ, by providing an external bias to the reaction system. It is also interesting to find that the provided biases not only can increase SDZ reaction rate, but also can promote the mineralization of SDZ. For achieving the highest degradation rate of SDZ, both carbon nano tube and graphene had an optimum doping amount of about 1% (by wt) to the amount of TiO2 for the catalyst preparation.
Seger, Brian J. "Electrocatalytic and photoelectrocatalytic aspects of proton exchange membrane based nanostructured assemblies." 2009. http://etd.nd.edu/ETD-db/theses/available/etd-06192009-110724/.
Повний текст джерелаThesis directed by Prashant V. Kamat for the Department of Chemical and Biomolecular Engineering. "June 2009." Includes bibliographical references (leaves 155-169).
Yan, You-Ting, and 顏佑庭. "Photoelectrocatalytic Oxidation of Toluene in Indoor Environment by Using Modified TiO2." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2a288a.
Повний текст джерела國立臺灣大學
環境工程學研究所
105
Volatile organic compounds (VOCs) are the major indoor air pollutant which are associated with indoor air quality (IAQ). It is considered as a cause of sick building syndrome (SBS). Source of VOCs indoor including upholstery materials, outdoor motor vehicle, consumer products and smoking, etc., will produce different levels of toluene emission, causing human health hazards. Currently, the technology of indoor VOCs treatment is based on photocatalytic oxidation (PCO) with UV light, but still have the problem of insufficient mineralization rate. The intermediate products produced by photocatalytic reaction may be more toxic, causing health hazards to indoor personnel instead. In addition, there are still have safety doubt for UV light apply to the indoor environment. In this study, toluene was degraded by photoelectrocatalytic (PEC) reaction in the photoreaction chamber, and a honeycomb metal monolith was placed inside, which can make the current flow through the whole reactor uniformly to ensure the process of photoelectrocatalytic reaction. The UV and visible light were controlled at 254nm and 420nm, and the photocatalyst was choosed the Degussa P25 TiO2 and modified Ag/AgBr/TiO2. The temperature was controlled at 25±1℃ and the humidity was maintained 30%. The impact factors of the experiment including toluene concentration, gas flow rate, light wavelength and voltage. In this study, Ag/AgBr/TiO2 was prepared with high reaction efficiency ratio (139.2%), and compared photocatalytic and photoelectrocatalytic activity with the P25 titanium dioxide. When Ag/AgBr/TiO2 was irradiated with ultraviolet light, the photoelectrocatalytic conversion of toluene was 95.9% at 0.5LPM flow rate and 0.2ppm toluene concentration. The photoelectrocatalytic conversion was significant increase from 59.9% to 97.4% after added voltage under visble light irradiation. And the highest conversion is 97.7% under the same conditions with using TiO2. The experimental results show that the higher the concentration of toluene is, the higher the conversion rate is. The reason is that active site of the photocatalyst surface is insufficient, causing the incomplete reaction , and reducing the photocatalytic efficiency. The products and mineralization rate of photoelectrocatalytic reaction were measured by GC-MS. It was found that the main byproduct of photocatalytic degradation of toluene was benzaldehyde and benzoic acid. The accumulation of benzoic acid on the surface of photocatalyst was the main reason of photocatalyst deactivation. In addition, part of the benzaldehyde form acetophenone by substitution reaction. When TiO2 was irradiated with ultraviolet light, the mineralization was 85% to 89%, resulting in more by-products. Mineralization can be maintained at more than 95% when using Ag/AgBr/TiO2 as photocatalyst, improving that it was helpful to increase the mineralization of toluene by modified photocatalyst. In the five times circulaing experiments, the TiO2 with poor reusability which was gradually deactivation after irradiated with ultraviolet light for 2 hours. It showed good stability and reproducibility that maintain at more than 80% conversion after 5 cycles when using Ag/AgBr/TiO2 as photocatalyst. The results of experiment showed the potential of processing indoor VOCs for future development by photoelectrocatalysis with modified photocatalyst and visible light. According to the result of energy efficiency, the energy efficiency of Ag/AgBr/TiO2 with visible light is the highest. The value are 0.2714mg kW-1 h-1 and 2.5891mg kW-1 h-1 respectively in two different concentration. And the energy efficiency are very close between two kinds of catalysts with UV light. Finally, evaluating the toluene conversion and energy efficiency, Ag/AgBr/TiO2 with visble light photoelectrocatalytic treatment of indoor VOCs has thepotential for future development.