Дисертації з теми "Photocatalysis"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Photocatalysis".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
He, Jijiang. "Preparation and photocatalysis of graphite carbon nitride based photocatalysts." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/521.
Повний текст джерелаZhou, Ruixin. "SEMICONDUCTOR PHOTOCATALYSIS: MECHANISMS, PHOTOCATALYTIC PERFORMANCES AND LIFETIME OF REDOX CARRIERS." UKnowledge, 2017. http://uknowledge.uky.edu/chemistry_etds/85.
Повний текст джерелаPlumejeau, Sandrine. "Croissance de TiO₂ en surface de fibres de cellulose pour l'élaboration de filtres photocatalytiques." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT230/document.
Повний текст джерелаThe pollution is definitely a major issue for environmental protection and sustainable development. Membrane technologies and advanced oxidation processes play more and more a key-role in the treatment of water both for the production of drinking water and for the treatment of municipal and industrial wastewaters. Heterogeneous photocatalysis is an advanced oxidation process for generating highly oxidizing species such as OH• in the presence of water and dioxygen, under irradiation of some semiconducting solids like titania (TiO2). The targeted objective for this PhD work is the development of efficient photocatalytic filters to be implemented in hybrid processes coupling separation and photodegradation. The innovative route investigated for preparing such photocatalytic filters is based on the use of a bio-based polymer, i.e. the cellulose, both as reactant (oxygen source) and mechanical support for the growth of titania nanoparticles from titanium tetrachloride. The first part of the thesis is dedicated to a literature review mainly focused on membrane and hybrid processes, on titanium dioxide and its photocatalytic properties and on the chemical, structural, microstructural and thermal behaviour of cellulose. After a description of the experimental procedures, the second part of this manuscript is first dedicated to the presentation and the discussion of the experimental results on the preparation and characterization of pure titania powders and of TiO2-carbon composite powders. The effect of titania doping by different transition metals in order to improve its functional properties is then examined. Simplification of the synthesis process by removing any is described in the next chapter. From the previously developed know-how on synthesis and photocatalytic performance, the last chapter is devoted to preliminary work on the preparation of photocatalytic filters and on the assessment of their functional properties
Guo, Muyao, and 郭牧遥. "Metal oxide photocatalysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50434457.
Повний текст джерелаpublished_or_final_version
Physics
Master
Master of Philosophy
Jackson, S. A. "Intermediates in photocatalysis." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384288.
Повний текст джерелаQiao, Yu. "Preparation, Characterization, and Evaluation of Photocatalytic Properties of a Novel NaNbO3/Bi2WO6 Heterostructure Photocatalyst for Water Treatment." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38080.
Повний текст джерелаYatmaz, Huseyin Cengiz. "Photocatalysis of organic effluents." Thesis, University of Newcastle Upon Tyne, 1993. http://hdl.handle.net/10443/271.
Повний текст джерелаO'Rourke, Christopher. "Photocatalysis for organic synthesis." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675420.
Повний текст джерелаCornu, Catherine J. G. Hoffmann Michael R. "Photocatalysis under periodic illumination." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-05082006-143046.
Повний текст джерелаMercer, Sarah M. "Heterogeneous photocatalysis: Design and experimental characterization of a new photocatalytic reactor for wastewater treatment." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27393.
Повний текст джерелаTran, Duc Trung. "Elaboration et mise en œuvre de membranes composites polymère-TiO2 faiblement colmatantes." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG023.
Повний текст джерелаThis thesis deals with the elaboration and performance of a specific type of ultrafiltration membrane with anti-fouling and photo-induced properties, the PVDF-TiO2 composite membrane. The membrane was fabricated via the nonsolvent-induced phase separation method by incorporating titanium dioxide (TiO2) nanoparticles into the polyvinylidene fluoride (PVDF) polymer matrix. The TiO2 nanoparticles played a significant role in facilitating the membrane formation process and improving the composite membrane properties compared to the neat PVDF membrane. It was demonstrated that, by changing the membrane preparation temperature, the membrane structure could be affected dramatically, notably the morphological dominance of finger-like macrovoids at lower temperatures and their diminution in both size and number when temperature increased. Other membrane properties also saw systematic transitions with changes in formation temperature, as characterized by permeability, porosity, mechanical strength, crystallinity, and thermal properties. In terms of performance, the PVDF-TiO2 membrane exhibited superior permeate flux compared to the neat PVDF membrane. More importantly, when being operated in photo-filtration mode (i.e. filtration with continuous ultraviolet (UV) irradiation on the membrane), the pure water flux of PVDF-TiO2 membrane could be further increased, thanks to the enhanced hydrophilicity of the membrane, which comes from the photo-induced hydrophilicity phenomenon of TiO2. Preliminary estimations suggest that photo-filtration is a cost-effective method, as the benefit from enhanced water output outweighs the extra energy demand for UV irradiation. Furthermore, the efficiency of photo-filtration was evaluated with synthetic feed solutions containing inorganic and organic contents representative in surface water. It was identified that, while most of the common inorganic ions in drinking water had no effects on photo-filtration efficiency, the coexistence of Cu2+ and HCO3- in the feed led to severe inorganic fouling and inhibited the photo-induced hydrophilicity phenomenon. Besides, the PVDF-TiO2 membrane also showed its stronger flux performance and photocatalytic activity during photo-filtration of solutions containing organic foulants like humic acids or sodium alginate. In conclusion, the PVDF-TiO2 composite membrane exhibited much improved properties and performance compared to the neat PVDF membrane, and even stronger performance when operated in photo-filtration mode. Thus, it is a promising candidate to be used in membrane-based applications for water treatment
Bai, Xiaofei. "Effet de taille et du dopage sur la structure, les transitions et les propriétés optiques de particules du multiferroïque BiFeO₃ pour des applications photocatalytiques." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC013/document.
Повний текст джерелаThis experimental PhD work has been dedicated to the synthesis, by wet chemistry methods, and characterization of nanoparticles based on multiferroic BiFeO3, with the aim of using them for photocatalytic applications. This material presents a bandgap of 2.6eV, which allows the charge carrier photoexcitation in the visible range, making BiFeO3 a very interesting system for photoinduced processes. This thesis has been particularly focused on characterizing the properties of BiFeO3 nanoparticles in view of understanding the relationship of their properties on their potential use for photocatalytic applications. First of all, the topic of the size effect on the structural properties, phase transitions, and physics and chemistry of the particles has been developed, keeping as first aim to separate the properties related to the surface from those arising from the bulk/core of the particle. To do so, the mastering and optimization of the synthesis processes of BiFeO3 particles at the nano and microscale were needed, to finally obtain different size compounds with high crystalline quality. Despite the size reduction of the particles, we notice that, thanks to the control of the synthesis process, our BiFeO3 nanoparticles present properties very close to those of the bulk BiFeO3 material, keeping the rhombohedral structure R3c with weak strain effects. In order to indirectly tune the optical properties exploiting the doping, we have succeeded in realizing a homogenous La3+ doping, and a partial Ca2+ doping, on the Bi3+ site. The optical properties of the nanoparticles and their use on the first photocatalytic experiments for degrading rhodamine B dye have shown the complexity of the physics and chemistry phenomena at their surface and of the light-particle processes. After analyzing optical absorbance data as a function of the particle size, we observe that the deduced bandgap for different particles is not the main parameter directing the photocatalytic performances. Other factors have been identified to be at the origin of the localization of the photoexcited charges, as the surface states linked to the skin layer of the nanoparticles, depicting structural defects, a reduction of the oxidation state of Fe3+ towards Fe2+ and the stabilization of other adsorbates, such as FeOOH; all these parameters may contribute to the change on the photocatalytic performances. The photocatalytic results are very encouraging, motivating to continue the study of BiFeO3 based nanoparticles, though depicting a 50% rhodamine B degradation after 4h of photocatalytic reaction using some of the present nanoparticles
Wang, Fan. "Visible light photocatalysis with supported metal nanoparticles for organic synthesis." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103567/1/Fan_Wang_Thesis.pdf.
Повний текст джерелаRan, Rong. "Preparation and Optimization of Novel Visible-Light-Active Photocatalysts for Waste-Water Treatment." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34152.
Повний текст джерелаAltomare, M. "TOWARDS THE PHOTOCATALYTIC PRODUCTION OF SOLAR FUELS - NANOSTRUCTURED TITANIUM DIOXIDE FOR PHOTOCATALYSIS & PHOTO-ELECTROCHEMISTRY." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/229553.
Повний текст джерелаMacDonald, Grant. "Mathematical modelling of semiconductor photocatalysis." Thesis, University of Strathclyde, 2016. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27029.
Повний текст джерелаDavies, R. H. "Semiconductor photocatalysis for water purification." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636399.
Повний текст джерелаColeman, Heather Margaret. "Photocatalysis of oestrogens in water." Thesis, University of Ulster, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342532.
Повний текст джерелаMohd, Ghazi Tinia Idaty. "Heterogeneous photocatalysis for chemicals manufacture." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614672.
Повний текст джерелаCrow, Matthew. "Environmental remediation and semiconductor photocatalysis." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=12837.
Повний текст джерелаBeheshtaein, Setareh. "Photocatalysis on a microfluidic reactor." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10108187.
Повний текст джерелаThe photocatalytic reaction has been integrated as a developing technology for various applications such as air and water remediation, and self-cleaning surfaces. The photocatalysis is an emerging pathway of heterogeneous photocatalysis and physical chemistry. In heterogeneous photocatalysis, semiconductor compounds, mainly TiO2, ZnO, CdS, and WO3, have been utilized especially for water treatment and contaminant degradation. Various pollutants, such as aromatic compounds, dyes and surface active agents, can be degraded with photocatalytic techniques. Ultraviolet light and visible light are the most important sources of radiation to conduct photocatalytic reactions.
In this study, we have developed a combined method using microfluidics and photocatalysis for wastewater treatment. This technique represents a promising solution for contaminant degradation that has advantages such as continuous operation, large surface area to volume ratio, rapid response, and fine flow control. The experiment was conducted by exposing samples to UV light with methylene blue as the model pollutant and titanium dioxide (TiO2) as the catalyst. The degradation of methylene blue was monitored with spectrophotometry. The effects of variables, such as residence time, chip thickness and intensity have been investigated. The photocatalytic degradation has been determined to be a pseudo-first-order reaction with a rate constant (0.18 C C0.334) related to catalyst concentration. Once optimized, this system could be scaled out to process wastewater at a larger scale.
Ye, Xuejun. "Selected topics on VOC photocatalysis." online access from Digital Dissertation Consortium, 2003. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3141458.
Повний текст джерелаWilson, Gregory J. "Photocatalysis with a heterosupramolecular assembly." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16290/1/Gregory_Wilson_Thesis.pdf.
Повний текст джерелаWilson, Gregory J. "Photocatalysis with a Heterosupramolecular Assembly." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16290/.
Повний текст джерелаPurohit, Bhagyesh. "Precursors-guided synthesis of upconverting nanomaterials for near-infrared driven photocatalysis." Electronic Thesis or Diss., Lyon, 2021. https://n2t.net/ark:/47881/m6sn08q4.
Повний текст джерелаThe utilization of solar energy to solve environmental problems such as water detoxification, air purification and hydrogen production has attracted great interest from the scientific community over the last two decades. Solar photocatalysis is an interesting avenue to target all these environmental issues. Currently, technologies do not yet allow for the efficient use of a significant portion of the solar spectrum, namely the infrared, which corresponds to nearly ~48% of the total solar spectrum. This thesis aims at preparing nanocomposite materials that use these low energy solar photons by converting them into high energy UV and visible photons and then using them for classical photocatalysis. To achieve this, two major aspects of the preparation of this modified photocatalyst were emphasized. Firstly, the synthesis of materials that could efficiently convert currently unused photons and secondly, the preparation of their composite with TiO2, the most widely used photocatalyst.This doctoral thesis focuses on an approach based on "upconversion" in order to extend the range of use of the solar spectrum. To achieve this goal, two optimization strategies were addressed. The optimization of the quantum efficiency of upconversion nanoparticles (UCNPs) using new anhydrous precursors and, the preparation of UCNPs-TiO2 nanocatalyst using metallogels and/or core-shell structures. Finally, we test the objective of using low energy infrared solar photons by performing photocatalysis under IR irradiation only using the platform developed in this work
Nascimento, Ulisses Magalhães. "Preparação, caracterização e testes catalíticos de um fotocatalisador magnético (Fe3O4/TiO2) na degradação de um poluente-modelo: acid blue 9." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-23042013-112144/.
Повний текст джерелаThe use of semiconductors for treating polluted waters and wastewaters is a promising environmental remediation technology, especially for organic pollutants. Among the several semiconductors that are also photocatalysts, TiO2 is extensively used for environmental application, due to its biological and chemical inertness, high oxidation power, low cost, and stability regarding corrosion. However, TiO2 also has some disadvantages, such as: it is only UV-excited and requires an additional unit operation (e.g. filtration or centrifugation) for reuse purposes. In order to work around those limitations, a simple procedure for synthesizing a magnetic photocatalyst (Fe3O4/TiO2), with high specific surface area and good photocatalytic activity when compared to Evonik\'s TiO2 P25, was used. The photocatalyst was synthesized in a three-step procedure: (1) α-Fe2O3 particles were obtained, by precipitation, from FeCl3.6H2O 0.01 mol L-1, which underwent a forced acid hydrolysis at 100°C for 48 h; (2) α-Fe2O3/TiO2 particles were obtained, by heterocoagulation, of Ti(IV) oxide species on the α-Fe2O3, followed by calcination at 500°C for 2 h; and (3) The core/shell photocatalyst particles were obtained by calcination the α-Fe2O3/TiO2 particles at 400°C for 1 h under reducing atmosphere (H2). The photocatalytic activity of the synthesized material was assessed by the color removal of an Acid Blue 9 (C.I. 42090) dye solution. pH and catalyst dosage effects were estimated by a 22 factorial design. Fe3O4/TiO2 core/shell particles with specific surface area of 202 m2 g-1were obtained. They were easily separated from the reaction medium, in approximately 2 min, with the aid of a magnet. The photocatalyst absorbed radiation throughout the visible spectrum. The greatest color removal (54%) was achieved with pH 3.0, 1.0 g L-1 of photocatalyst, and 2 h of reaction.
Huo, Zhaohui. "Polyoxometalate - porphyrin hybrids systems : application for the photocurrent generation and the photocatalysis." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF032/document.
Повний текст джерелаPolyoxometalates-porphyrin hybrid films were synthesized based on covalent or electrostatic interactions. Copolymeric polyoxometalate–porphyrin films were obtained by the electro-oxidation of zinc octaethylporphyrin (ZnOEP) or 5,15-ditolyl porphyrin (H2T2P) in the presence of a different type of polyoxometalates (POMs) bearing two pyridyl groups (py-POM-py). Three type of py-POM-py have been used: i) a tris-alkoxo functionalized Lindqvist polyoxovanadate, ii) an organosilyl functionalized Keggin-type [PW11Si2O40C26H16N2]3- and Dawson-type [P2W17Si2O62C26H16N2]6-, and iii) a bis-pyridine-substituted organo-polyoxometallic bricks using [P2W15V3O62]9− diolamide-grafting method with various geometries of the pendant group. All are applied for photocurrent generation and photocatalytical recovery of metals (Ag and Pt). Electrostatic POM-porphyrin films were also prepared by incorporated Preyssler type polyanion [NaP5W30O110]14- onto the electropolymerized polycationic porphyrin (poly-ZnOEP) with viologen or bis-viologen as spacers. [NaP5W30O110]14- as an efficient electron shuttle between the excited ZnOEP and viologen (or bis-viologen) which effectively retarded the fast charge pair recombination and enhanced the photocurrent magnitude. Later, we introduced nanoparticles POM@MNPs to a bis-porphyrin copolymer through metathesis reaction to further improve the efficiency of the photocurrent generation in which the localized surface plasmon resonance that occurs at the surface of silver nanoparticles has substantially enhanced the electronic excitation of surface-anchored porphyrin
Ede, Sarah Melinda. "Infrared and photocatalytic studies of model bacterial species for water treatment." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16438/1/Sarah_Ede_Thesis.pdf.
Повний текст джерелаEde, Sarah Melinda. "Infrared and photocatalytic studies of model bacterial species for water treatment." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16438/.
Повний текст джерелаKarriem, Fatiema. "Oxidative fixation of dinitrogen by photocatalysis." Thesis, University of Western Cape, 2000. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5777_1267648612.
Повний текст джерела
The heterogeneous photocatalytic oxidation of dinitrogen to nitrate, NO3 and/or nitrite, no2 using peroxy species of titanium (IV) in aqueous suspensions has been investigated. The photocatalysts used were titanium peroxide and Degussa p25 TiO2 pretreated with H2O2. These photocatalysts were investigated by SEM and FTIR spectroscopy.  
Cai, Yanling. "Titanium Dioxide Photocatalysis in Biomaterials Applications." Doctoral thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160634.
Повний текст джерелаGomes, Ana Catarina Costa. "Photocatalysis : Carbonylation of arenas and alkanes." Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516370.
Повний текст джерелаLafta, Abbas Jassim Attia. "New materials for photocatalysis and photovoltaics." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4105/.
Повний текст джерелаElhage, Ayda. "Palladium-based Catalyst for Heterogeneous Photocatalysis." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39388.
Повний текст джерелаWang, Zheng. "Studies on the Photocatalytic Conversion of CO2 in and by H2O over Heterogeneous Photocatalysts." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199324.
Повний текст джерелаYamamoto, Akira. "Studies on Low-temperature De-NoX System over TiO2-based Photocatalysts." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/200501.
Повний текст джерелаLam, Chun-wai Ringo, and 林俊偉. "Development of photocatalytic oxidation technology for purification ofair and water." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38572382.
Повний текст джерелаHathway, Timothy Lee. "Titanium dioxide photocatalysis studies of the degradation of organic molecules and characterization of photocatalysts using mechanistic organic chemistry /." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3369929.
Повний текст джерелаSasser, Shawn. "The Design and Testing of a Novel Batch Photocatalytic Reactor and Photocatalyst." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6381.
Повний текст джерелаPang, Rui. "Development of Novel Photocatalysts and Co-catalysts for Photocatalytic Conversion of CO2 by H20." Kyoto University, 2019. http://hdl.handle.net/2433/242527.
Повний текст джерелаXiao, Qi. "Visible light photocatalytic synthesis of fine organic chemicals with new photocatalysts." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84078/14/Qi_Xiao_Thesis.pdf.
Повний текст джерелаShahine, Issraa. "A chemical route to design plasmonic-semiconductor nanomaterials heterojunction for photocatalysis applications." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0105/document.
Повний текст джерелаHybrid heterojunctions composed of semiconductors and metallic nanostructures have perceived as a sustainable technology, due to their perfect effectiveness in improving, renovating, and enriching the properties of the integrated components. The cooperative coupling results in the variation of the system’s functional properties, by which the metal-generated surface plasmon resonance can enhance the charge separation, light absorption, as well as luminescence of the semiconductor. This phenomenon enables strong interactions with other photonic elements such as quantum emitters. These multifaceted functionalities arise from the synergic exciton-plasmon interaction between the linked units. Thereby, hybrid systems become suitable for various applications including: solar energy conversion, optoelectronic devices, light-emitting diodes (LED), photocatalysis, biomedical sensing, etc. Au-ZnO nanostructures have received growing interest in these applications, where the deposition of gold nanoparticles (GNPs) promotes the system’s response towards the visible region of the light spectrum through their surface plasmon resonance (SPR). Based on a specific size and purity of ZnO nanostructures, as well as the GNPs, and a definite inter-distance between the nanoparticles, the properties of the ZnO nanostructures are varied, especially the photoemission and photocatalytic ones. In this context, we have focused on the construction of size-tunable ZnO nanocrystals (NCs), then incorporated into GNPs solutions using a simple chemical way. This work is divided into two parts: the first is to perform synthesis of pure ZnO NCs having excellent UV photoluminescence. This was achieved through a low-temperature aqueous synthesis, resulting in rough and amorphous structures. The synthesis was followed by a post-thermal treatment in order to crystallize the obtained particles. The synthesis was followed by structural and optical studies (SEM, TEM, XRD, photoluminescence). The photocatalytic activities of ZnO NCs were studied through tailoring their ability to degrade the methylene blue (MB) dye. In addition, the relationship between ZnO structures, luminescence, and photocatalytic properties was explored in details. In the second step, the obtained ZnO NCs were added to gold nanoparticles of various sizes and volume fractions. The effective role of GNPs concerning their size, amount, and their capping molecule on the photoemission of the ZnO nanostructures was emphasized through the charge and/or energy transfer between the constituents in the hybrid system. In the same way, the systems photocatalytic activities were examined after coupling ZnO to GNPs. Further advancement in the integration of the ZnO NCs into PMMA polymer layers was featured in order to obtain large area template of homogenous ZnO properties. The PMMA-assembled ZnO nanoparticles could be promising substrates as catalysts for growing ZnO nanowires, metallic nanoparticles and hybrid nanomaterials
Grant, Neil. "Application of titania photocatalysis for organic synthesis." Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=185854.
Повний текст джерелаSawunyama, P. "Catalysis, photocatalysis and corrosion involving metal oxides." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638775.
Повний текст джерелаBelghazi, A. "Heterogeneous semiconductor UV-photocatalysis for water purification." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636072.
Повний текст джерелаJo, Won Jun. "Solar energy conversion via photovoltaics and photocatalysis." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111409.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references.
Due to the forthcoming shortage of natural resources, the demand for more efficient and ecofriendly chemical processes for the conversion of energy and matter, especially with respect to carbon management, is growing rapidly. Therefore, a search for high-performance solar energy conversion systems to end the current carbon economy era is of paramount importance in both academic and industrial sectors. In this regard, we have studied organic photovoltaics and solar water splitting by using oCVD (Oxidative Chemical Vapor Deposition) polymers and doping-treated bismuth vanadate (BiVO 4), respectively. oCVD is a solvent-free conformal vacuum-based technique to enable thin-film fabrication of insoluble polymers at moderate vacuum (~ 0.1 Torr) and low temperature (25 150 °C). Moreover, oCVD carries the well-cited processing benefits of vacuum processing, such as parallel and sequential deposition, well-defined thickness control, large-area uniformity, and inline integration with other standard vacuum processes (e.g., vacuum thermal evaporation). Based on the above-mentioned technical advantages from oCVD, polyselenophene and poly(3,4- dimethoxythiophene) have been successfully applied to organic photovoltaics. Cost-effective solar hydrogen production requires catalytic materials that have earth-abundant element composition, suitable photoelectrochemical properties, and broad technological applicability. To create this versatile catalytic material, controlling the catalyst's atomic structure is of primary importance since their functionalities (e.g., electronic band structure, catalytic activity, chemical stability, etc.) are governed by its atomic structure. According to the strategy, BiVO 4's atomic structure has been engineered via phosphorus, indium and molybdenum doping. The improved photocatalytic behavior of doping-treated BiVO4 has been studied within experimental and computational domains.
by Won Jun Jo.
Ph. D.
Kazantsev, Roman V. "Self-Assembled, Crystalline Organic Nanostructures for Photocatalysis." Thesis, Northwestern University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=3741384.
Повний текст джерелаThe goal of this thesis was to integrate light-absorbing supramolecular materials into a photocatalytic system for solar-to-fuel conversion. Toward this end, a series of perylene-based chromophore amphiphiles was synthesized and their self-assembly properties explored. Characterization of these materials by electron microscopy and x-ray scattering techniques revealed molecular assembly into 1D ribbon nanostructures. Surprisingly, these ribbons were observed to spontaneously crystallize in solution, as observed by wide-angle and grazing incidence X-ray scattering. These crystalline nanostructures could be gelled with oppositely charged electrolytes, forming a 3D light-absorbing scaffold. By designing and synthesizing oppositely charged proton reduction catalysts to electrostatically bind to the light-absorbing scaffold, hydrogen gas was detected by gas chromatography after white light illumination of the scaffold / catalyst system. As a direct result of their crystalline nature, the exciton properties of these materials and the photocatalytic properties of the system could be tuned by slight modification in their molecular packing arrangement. These changes were achieved by creating a library of chromophores with small functional groups directly attached to the PMI core. Some amphiphiles in this library were observed to undergo a crystalline phase transition between two unique packing arrangements as evidenced by variable temperature absorbance and x-ray scattering experiments. This transition involved a substantial change in the exciton properties of the material. Surprisingly, some crystalline phases carried the distinct spectral signature of charge-transfer (CT) excitons, an excitation that is shared among multiple chromophores. Characterization of this CT state was accomplished by ground state and transient absorption spectroscopy, transient electron paramagnetic resonance spectroscopy, and second-order harmonic generation microscopy. The crystalline nanostructures of the library that yielded evidence for CT-excitons were the most photocatalytically active. This observation is consistent with established theories developed elsewhere that connect CT-exciton formation with an enhancement in exciton mobility.
Khan, Muhammad Abdullah. "Carbon nitride based materials for heterogeneous photocatalysis." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8498a9f5-e5c8-4eda-b62d-0cd36471759c.
Повний текст джерелаPyrgiotakis, Georgios. "Titania carbon nanotube composites for enhanced photocatalysis." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013482.
Повний текст джерелаLi, Zizhen. "Development of Two Dimensional Materials in Photocatalysis." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39507.
Повний текст джерела