Relevant bibliographies by topics / Magnetic photocatalyst

Academic literature on the topic 'Magnetic photocatalyst'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Magnetic photocatalyst"

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Pujiarti, Yuly, Suyanta Suyanta, and Eko Sri Kunarti. "A Visible Light-Induced Fe3O4/ZnO-Cu Nanocomposite and its Photocatalytic Activities for Rhodamine B Photodegradation." Key Engineering Materials 884 (May 2021): 60–66. http://dx.doi.org/10.4028/www.scientific.net/kem.884.60.

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Synthesis of Fe3O4/ZnO-Cu nanocomposite photocatalyst has been conducted. The synthesis was carried out using the co-precipitation method with the variation of Cu concentration and modification by Fe3O4 magnetic material. As synthesized photocatalysts were characterized using FTIR, XRD, TEM, and SR UV-Visible. Photocatalytic activities of samples were evaluated through Rhodamine B degradation under visible light irradiation. The results showed that a sample with Fe3O4/ZnO-Cu 1% has smaller band gap energy of 2.90 eV and the highest photocatalytic activity than pure ZnO or Fe3O4-modified ZnO (Fe3O4/ZnO-Cu 0%) under visible light. The percentage of Rhodamine B degradation was approximately 89.41% during 120 min of visible light illumination. Moreover, the photocatalyst materials could be easily separated after photocatalysis which is due to the magnetic property of Fe3O4 material. Therefore, Cu-doped ZnO with Fe3O4 modification has been an efficient and effective visible-light-induced photocatalyst in removing non-biodegradable Rhodamine B dyes.
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Liu, Robert, Chia Feng Wu, and Ming Der Ger. "Degradation of FBL Dye Wastewater by Magnetic Photocatalysts from Scraps." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/651021.

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Magnetic photocatalyst solves the separation problem between wastewater and TiO2photocatalysts by the application of magnetic field. This research investigates the treatment of simulated FBL dye wastewater using Mn-Zn ferrite/TiO2magnetic photocatalyst. The magnetic Mn-Zn ferrite powder was first produced by a chemical coprecipitation method from spent dry batteries and spent pickling acid solutions. These two scraps comprise the only constituents of Mn-Zn ferrite. The as-synthesized Mn-Zn ferrite was then suspended in a solution containing Ti(SO4)2and urea. Subsequently a magnetic photocatalyst was obtained from the solution by chemical coprecipitation. The prepared Mn-Zn ferrite powder and magnetic photocatalyst (Mn-Zn ferrite/TiO2) were characterized using XRD, EDX, SEM, SQUID, BET, and so forth. The photocatalytic activity of the synthesized magnetic photocatalysts was tested using degradation of FBL dye wastewater. The adsorption and degradation studies by the TOC and ADMI measurement were carried out, respectively. The adsorption isotherm and Langmuir-Hinshelwood kinetic model for the prepared magnetic TiO2were proved to be applicable for the treatment. This research transforms waste into a valuable magnetic photocatalyst.
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Zhang, Qing Wei, Wei Xie, Bao Hong Shen, Qiang Xie, and Xiao Liang Li. "Preparation of Magnetically Separable Composite Photocatalyst: Titania Coated Magnetic Activated Carbon." Applied Mechanics and Materials 719-720 (January 2015): 145–56. http://dx.doi.org/10.4028/www.scientific.net/amm.719-720.145.

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In the present work, the embedded-type TiO2/magnetic activated carbon (TiO2/MAC) photocatalysts were prepared. The MAC support was manufactured by one-step method and the TiO2coated on the surface of MAC was prepared by sol-gel method. Its crystalline structural properties, morphology, magnetic performances and pore texture were characterized by XRD, SEM, TEM, ultraviolet-visible absorption spectra (Uv-vis), vibrating sample magnetometry (VSM) and N2adsorption isotherm. Characterization results showed that TiO2was highly dispersed on the surface of MAC support in the form of anatase with a particle size of 10 nm. Obtained TiO2/MAC photocatalysts were applied to treatment of contaminant phenol in aqueous solution. The phenol removal percentage by TiO2/MAC photocatalyst is as high as 94% after three cycles. In addition, photocatalytic degradation of phenol in water was examined using TiO2/MAC photocatalysts. The results show that 4wt% Fe3O4was suitable to prepare the support of TiO2/MAC composite. The phenol removal percentage by TiO2/MAC photocatalyst is as high as 94% after three cycles. However, the adsorption capability of photocatalyst disappears after six cycles, while its phenol removal percentage via photodegradation is still as high as 60%. Meanwhile, the used TiO2/MAC photocatalyst after six cycles still maintains good magnetic stability because the majority of magnetic particles are embedded into the bulk of carbon matrix. And the embedded structure could still meet the requirement of magnetic separation by an external magnetic field.
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Lu, Ziyang, Zehui Yu, Jinbo Dong, Xinyu Xiong, Lin Gao, Minshan Song, Yang Liu, Di Fan, Yongsheng Yan, and Pengwei Huo. "Enhanced Photocatalytic Activity and Selectivity of a Novel Magnetic PW@PEDOT Imprinted Photocatalyst with Good Reproducibility." Nano 13, no. 02 (February 2018): 1850020. http://dx.doi.org/10.1142/s1793292018500200.

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The novel magnetic PW-doped PEDOT (PW@PEDOT) imprinted photocatalyst with good reproducibility was prepared by the surface imprinting technique and microwave heating method. Due to the existence of PW@PEDOT and imprinted cavity in the imprinted layer, the as-prepared magnetic PW@PEDOT imprinted photocatalyst not only had higher photocatalytic activity, but also had the excellent specific recognition ability for selective photodegradation of TC. This paper proposed a new idea to prepare the imprinted photocatalysts.
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Wu, Chun Du, Kun Zheng, and Qing Jie Xie. "The Primary Study of Synthesis and Photocatalytic Activity of ZnO/Nickel-Zinc Ferrite Magnetic Photocatalyst." Advanced Materials Research 955-959 (June 2014): 154–57. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.154.

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Magnetic photocatalyst ZnO/nickel-zinc ferrite powders were synthesized by two-step method: First ,nickel-zinc ferrite powders were prepared by coprecipitation method and then ZnO /nickel-zinc ferrite composite powders were prepared by the homogeneous precipitation method. The as-prepared sample was characterized by X-ray Diffraction (XRD), and Transmission Electron Microscopy (TEM), the photocatalysis of the catalyst was evaluated with methylene blue as decomposition substance and the photocatalytic activity of the material has been tested on decomposable substrate under visible-light in the magnetic photocatalytic wastewater treatment reactor. The results demonstrate that the magnetic photocatalyst ZnO/nickel-zinc ferrite powders exhibit highly efficient visible-light-driven photocatalytic activity, the degradation rate of methylene blue is 84%.
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Yan, Li Jun, Yue Cheng, Xiao Juan Yan, and Tan Tan Ge. "Preparation and Photocatalytic Properties of Magnetic TiO2 Compounds." Advanced Materials Research 396-398 (November 2011): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.306.

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In this paper, magnetic composite photocatalysts were prepared through depositing TiO2 on the surface of NiFe2O4 by sol-gel method. The composition, structure and magnetism of the samples are tested by XRD, TEM and VSM, respectively. The photoactivity of the as-prepared photocatalysts was investigated by degrading methyl orange under UV light. The effect of NiFe2O4 and SiO2 intermediate layer on the activity of photocatalyst was also studied. It has been found that NiFe2O4 has a negative influence on the photocatalytic activity of magnetic TiO2 compounds. The middle layer of SiO2 can effectively improve the photocatalytic activity of magnetic TiO2 compounds.
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Liu, Robert, and H. T. Ou. "Synthesis and Application of Magnetic Photocatalyst of Ni-Zn Ferrite/TiO2from IC Lead Frame Scraps." Journal of Nanotechnology 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/727210.

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IC lead frame scraps with about 18.01% tin, 34.33% nickel, and 47.66% iron in composition are industrial wastes of IC lead frame production. The amount of thousand tons of frame scraps in Taiwan each year is treated as scrap irons. Ni-Zn ferrites used in high frequent inductors and filters are produced from Ni-Zn ferrite powders by pressing and sintering. The amount of several ten thousand tons of ferrites ofNi1-XZnXFe2O4in compositions is consumed annually in the whole world. Therefore, these IC lead frame scraps will be used in this research as raw materials to fabricate magnetic ferrite powders and combined subsequently with titanium sulfate and urea to produce magnetic photocatalysts by coprecipitation for effective waste utilization. The prepared Ni-Zn ferrite powder and magnetic photocatalyst (Ni-Zn ferrite/TiO2) were characterized by ICP, XRF, XRD, EDX, SEM, SQUID, and BET. The photocatalytic activity of synthesized magnetic photocatalysts was tested by FBL dye wastewater degradation. TOC and ADMI measurement for degradation studies were carried out, respectively. Langmuir-Hinshelwood kinetic model of the prepared magnetic TiO2proved available for the treatments. Wastes are transformed to valuable magnetic photocatalysts in this research to solve the separation problem of wastewater and TiO2photocatalysts by magnetic field.
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Ojemaye, Mike O., Omobola O. Okoh, and Anthony I. Okoh. "Performance of NiFe2O4-SiO2-TiO2 Magnetic Photocatalyst for the Effective Photocatalytic Reduction of Cr(VI) in Aqueous Solutions." Journal of Nanomaterials 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/5264910.

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Investigation into the reduction of Cr(VI) in aqueous solution was carried out through some batch photocatalytic studies. The photocatalysts used were silica coated nickel ferrite nanoparticles (NiFe2O4-SiO2), nickel ferrite titanium dioxide (NiFe2O4-TiO2), nickel ferrite silica titanium dioxide (NiFe2O4-SiO2-TiO2), and titanium dioxide (TiO2). The characterization of the materials prepared via stepwise synthesis using coprecipitation and sol-gel methods were carried out with the aid of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), and vibrating sample magnetometry (VSM). The reduction efficiency was studied as a function of pH, photocatalyst dose, and contact time. The effects of silica interlayer between the magnetic photocatalyst materials reveal that reduction efficiency of NiFe2O4-SiO2-TiO2 towards Cr(VI) was higher than that of NiFe2O4-TiO2. However, TiO2 was observed to have the highest reduction efficiency at all batch photocatalytic experiments. Kinetics study shows that photocatalytic reduction of Cr(VI) obeyed Langmuir-Hinshelwood model and first-order rate kinetics. Regenerability study also suggested that the photocatalyst materials can be reused.
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Ding, Zhiqiang, Yue Liu, Yong Fu, Feng Chen, Zhangpei Chen, and Jianshe Hu. "Magnetically recyclable Ag/TiO2 co-decorated magnetic silica composite for photodegradation of dibutyl phthalate with fluorescent lamps." Water Science and Technology 81, no. 4 (February 15, 2020): 790–800. http://dx.doi.org/10.2166/wst.2020.162.

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Abstract In recent years, industrial contaminants and especially organic pollutions have been threatening both environmental safety and human health. Particularly, dibutyl phthalate (DBP) has been considered as one of the major hazardous contaminants due to its widespread production and ecological toxicities. Consequently, reliable methods toward the efficient and environmentally benign degradation of DBP in wastewater would be very desirable. To this end, a novel magnetically separable porous TiO2/Ag composite photocatalyst with magnetic Fe3O4 particles as the core was developed and successfully introduced to the photocatalytic degradation of DBP under visible irradiation with a fluorescent lamp. The presented work describes the grafting of Ag co-doped TiO2 composite on the silica-modified porous Fe3O4 magnetic particles with a simple and inexpensive chemical co-precipitation method. Through the investigation of the influencing factors including photocatalyst dosage, initial concentration of DBP, solution pH, and H2O2 content, we found that the degradation efficiency could reach 74%. The photodegradation recovery experiment showed that the degradation efficiency of this photocatalyst remained almost the same after five times of reuse. In addition, a plausible degradation process was also proposed involving the attack of active hydroxyl radicals generated from this photocatalysis system and production of the corresponding intermediates of butyl phthalate, diethyl phthalate, dipropyl phthalate, methyl benzoate, and benzoic acid.
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Lu, Zhong Li, Hui Zhang, and Xue Duan. "Synthesis, Characterization and Catalytic Property of Nanoscale Magnetic Photocatalyst Titania/Silica/Cobalt Ferrite." Advanced Materials Research 11-12 (February 2006): 611–14. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.611.

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Magnetic material CoFe2O4 was prepared via layered precursor method. Magnetic nanosized photocatalyst TiO2/SiO2/CoFe2O4 was synthesized by hydrolysis titanium bis- ammonium lactato dihydroxide into photoactive TiO2 onto silica-modified CoFe2O4. Based on XRD, FT-IR, VSM analysis and catalytic evaluation, as-synthesized magnetic photocatalyst possess core-shell structure and exhibits evident photodegradation activity for methyl orange.
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Dissertations / Theses on the topic "Magnetic photocatalyst"

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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/.

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A aplicação de semicondutores no tratamento de água e efluentes líquidos é uma tecnologia de remediação ambiental promissora, em especial para poluentes orgânicos. Entre os vários semicondutores que também são fotocatalisadores, o TiO2 é amplamente usado em aplicações ambientais, por ser inerte biológica e quimicamente, ter elevado potencial de oxidação, baixo custo e estabilidade frente à corrosão. Entretanto, o TiO2 também tem algumas desvantagens, tais como: ele é excitado apenas por luz UV e requer uma operação unitária adicional (por exemplo, filtração ou centrifugação) para o reuso do catalisador. Para contornar estas limitações, usou-se um procedimento simples para a síntese de um fotocatalisador magnético (Fe3O4/TiO2) com alta área superficial específica e atividade catalítica, quando comparado com o TiO2 P25 da Evonik. O fotocatalisador foi sintetizado através de um procedimento em três etapas: (1) Partículas α-Fe2O3 foram obtidas por precipitação de uma solução de FeCl3.6H2O 0.01 mol L-1, que foi submetida a uma hidrólise forçada à 100°C por 48 h; (2) Partículas de α-Fe2O3/TiO2 foram obtidas por heterocoagulação de oxi-hidróxidos de Ti(IV) sobre as partículas de α-Fe2O3, as quais foram calcinada a 500°C por 2 h; e (3) As partículas \"casaca/caroço\" do fotocatalisador foram obtidas por calcinação a 400°C por 1 h sob atmosfera redutora (H2). A atividade fotocatalítica do material sintetizado foi avaliada aplicando-o no descoramento de uma solução do corante Azul Ácido 9 (C.I. 42090). Os efeitos do pH e da concentração de catalisador foram estimados por meio de um planejamento fatorial 22. Foi obtido um fotocatalisador com área superficial específica de 202 m2 g-1, facilmente separável do meio reacional em aproximadamente 2 min com o auxílio de um ímã. O fotocatalisador apresentou absorção em toda a região do visível. A maior remoção de cor (54%) foi obtida com pH 3,0, 1,0 g L-1 de catalisador e 2 horas de reação.
The 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.
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Beydoun, Donia Chemical Engineering &amp Industrial Chemistry UNSW. "Development of a novel magnetic photocatalyst : preparation, characterisation and implication for organic degradation in aqueous systems." Awarded by:University of New South Wales. Chemical Engineering and Industrial Chemistry, 2000. http://handle.unsw.edu.au/1959.4/20451.

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Magnetic photocatalysts were synthesised by coating a magnetic core with a layer of photoactive titanium dioxide. This magnetic photocatalyst is for use in slurry-type reactors in which the catalyst can be easily recovered by the application of an external magnetic field. The first attempt at producing this magnetic photocatalyst involved the direct deposition of titanium dioxide onto the surface of magnetic iron oxide particles. The photoactivity of these Fe3O4/TiO2 was lower than that of single-phase TiO2 and was found to decrease with an increase in the heat treatment. These observations were explained in terms of an unfavourable heterojunction between the titanium dioxide and the iron oxide core. Fe ion diffusion from the iron oxide core into the titanium dioxide matrix upon heat treatment, leading to a highly doped TiO2 lattice, was also contributing to the observed low activities of these samples. These Fe3O4/TiO2 particles were found to be unstable, with photodissolution of the iron oxide phase being encountered. This photodissolution was dependent on the heat treatment applied, the greater the extent of the heat treatment, the lower the incidence of photodissolution. This was explained in terms of the stability of the iron oxide phases present, as well as the lower photoactivity of the titanium dioxide matrix. In fact, the observed photodissolution was found to be induced-photodissolution. That is, the photogenerated electrons in the titanium dioxide phase were being injected into the lower lying conduction band of the iron oxide core, leading to its reduction and then dissolution. Thus, the approach of directly depositing TiO2 onto the surface of a magnetic iron oxide core proved ineffective in producing a stable magnetic photocatalyst. The introduction of an intermediate passive SiO2 layer between the titanium dioxide phase and the iron oxide phase inhibited the direct electrical contact and hence prevented the photodissolution of the iron oxide phase. Improvements in the photoactivity were seen to be due to the inhibition of both the electronic and chemical interactions between the iron oxide and titanium dioxide phases. Preliminary optimisation experiments revealed that a thin SiO2 layer is sufficient for inhibiting the photodissolution. The thickness of the TiO2 coating was found not to have a significant effect on the photocatalytic performance of the coated particles. Finally, heat treating for 20 minutes at 450??C was sufficient for converting the titanium dioxide into a photoactive phase, longer heating times had no beneficial effect on the photoactivity.
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Luo, Mingliang. "Heterogeneous catalytic oxidation of aqueous phenol using an iron-based catalyst and a magnetic titanium dioxide photocatalyst." Thesis, University of East Anglia, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445198.

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Ericson, Mårten. "Study of the Preparation of Mesoporous Magnetic Microspheres and Their Applications." Thesis, KTH, Industriell ekologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102550.

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Treatment of wastewater using magnetic technology is a rising field. In this thesis, the latest research on the subject is reviewed and several adsorbents with different coatings, which impart them unique properties, are discussed. Separation of particles from aqueous solution using magnetic technology is more convenient compared to conventional techniques, such as filtration and centrifugation. The adsorbents described in this thesis are effective for adsorption of several types of contaminants, such as heavy metals and different types of dyes.    Magnetic microspheres were synthesised using porous polystyrene microspheres as template. The microspheres were first sulfonated using chlorosulfonic acid followed by stirring in the presence of ferrous chloride which then was oxidised and magnetic nanoparticles were formed on the surface.    The sulfonated microspheres had a surface area of 420 m2/g and the magnetic 175 m2/g, indicative of Fe3O4 nanoparticles were successfully formed in the pores. The weight fraction of the Fe3O4 nanoparticles in the magnetic microspheres was 33 %.    Adsorption and desorption studies of the cationic dye, methylene blue, using mesoporous magnetic microspheres were performed. The results show that the mesoporous magnetic microspheres have good ability to adsorb methylene blue at low concentrations. In a cycle study the adsorption efficiency were nearly 100 % throughout the study. Using a 6/4 EtOH/H2O with saturated KCl solution the desorption efficiency in the cycle study were about 95 %.      The microspheres were used as carriers for TiO2 in order to overcome the problem with the separation of TiO2 from solution. The TGA results show that the microspheres contained about 12 % of TiO2. The TiO2 coated microspheres were used for the photocatalytic degradation of phenol. However, the TiO2 microspheres did not work. This was a result from that the phenol had too little contact with the TiO2. A possible way of solving this problem could be to decrease the size of the microspheres, thus increase the surface area.    Lysozyme was adsorbed and separated using the porous microspheres. The lysozyme adsorption worked best at pH 9.6, which is the pI for lysozyme. The lysozyme could be extracted from the microspheres by using a pH 13 buffer. Also, by using MeOH/H2O and EtOH/H2O solutions with saturated KCl the lysozyme could be desorbed. An adsorption and desorption mechanism was also presented.
Vattenrening med magnetisk teknologi är en ny och alltmer uppmärksammad teknik. Magnetisk separation är ett enkelt och snabbt sätt att separera något från en lösning. Magnetisk separation är mer lätthanterligt jämfört med traditionell separationsteknik såsom centrifugering och filtrering.  Med porösa polystyren mikrosfärer som mall, syntetiserades magnetiska mikrosfärer. Först så sulfonerades mikrosfärerna med klorosulfonisk syra, följt av att de rördes om i en järnkloridlösning. Magnetiska nanopartiklar bildades i porerna och på ytan av mikrosfärerna.    Sulfonerade mikrosfärerna hade en specifik ytarea på 420 m2/g och de magnetiska 175　m2/g, detta indikerar att Fe3O4-nanopartiklar bildades på ytan och i porerna. Massfraktionen av Fe3O4 var 33 %.    Adsorption- och desorptionsstudier på de magnetiska mikrosfärerna utfördes. Färgämnet metylblått användes i studien. Resultaten visade att magnetiska mikrosfärerna hade en bra adsorptionsförmåga vid låga koncentrationer av metylblått. Cykelstudier visade att adsorptionsverkningsgraden var nära 100 % under flera adsorptionscykler. Desorptionsförsök med olika lösningsmedel visade att en mättad KCl 6/4 EtOH/H2O lösning gav en desorptions-verkningsgrad på ca 95 %.   Mikrosfärerna användes som mall och kärna för att syntetisera en TiO2-fotokatalysator, detta för att överkomma problemet som finns med separation av rent TiO2 pulver från lösning. TGA resultaten visade att mikrosfärerna innehöll ca 12 % TiO2. De syntetiserade TiO2-mikrosfärerna användes till att bryta ner fenol fotokatalytiskt. Dock fungerade inte detta experiment. En anledning var att fenolen hade för lite kontakt med TiO2. En lösning på detta problem är att använda mikrosfärer med högre specifik ytarea.    Proteinet lysozym användes som modellprotein för försök att separera proteiner från lösning genom att använda porösa mikrosfärer. Resultatet visade att lysozym kunde adsorberas vid pH 9.6. Med en pH 13 buffer kunde lysozymet sedan extraheras från mikrosfärerna. En mekanism för adsorptionen och desorptionen på mikrosfärerna presenterades.
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Daniel, Lisa Maree. "Laponite-supported titania photocatalysts." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16669/.

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This thesis describes the synthesis and characterisation of titania photocatalysts for incorporation into a polyethylene film. Monodisperse, anatase-phase titania nanoparticles are prepared and the synthesis conditions necessary for attraction to a laponite clay support are determined. Methods of preventing agglomeration of the laponite system such as the use of a polyethylene oxide surfactant or chemical modification of the laponite plate edges with a dimethyloctyl methoxysilane are also explored. Finally, photocatalytic studies on the laponite-supported titania nanoparticles are performed, and the compatibility and photoactivity of these materials in the polyethylene film are examined.
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Finger, Marcel Goulart. "ADSORÇÃO E FOTOCATÁLISE DA NIMESULIDA E DO 17-ESTRADIOL EM SOLUÇÕES AQUOSAS POR CARVÃO ATIVO DECORADO COM FERRITA NANOESTRUTURADA." Centro Universitário Franciscano, 2016. http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/552.

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This work aimed to investigate the adsorption and photocatalysis of solutions containing nimesulide and 17β-estradiol with a composite formed of active charcoal decorated with NiFe2O4 nanoparticles. The composite was prepared by the hydrothermal method using Ni (NO3)2 6H2O and Fe(NO3)3 9H2O as precursors solubilized in basic aqueous medium. The solution was sealed in a Teflon reactor and heated 463.15 K for 10 h. The composite was characterized by X-ray diffraction, the morphology was observed by scanning electron microscopy and the with the vibrating sample magnetometer. Nimesulide and 17β-estradiol adsorb according to a pseudo-second order kinetics. The calculation of the thermodynamic parameters of adsorption indicated that the adsorption of nimesulide occurs in an endothermic, spontaneous and favorable manner in all temperatures investigated. The adsorption enthalpy magnitude between the nimesulide and the active charcoal decorated with ferrite is 90.2 kJ mol-1 which indicates that the adsorption is endothermic and occurs through chemisorption. The initial concentration of nimesulide decays by 70% and the concentration of 17β-estradiol decays by 99% after 60 min of UV light irradiation.
Este trabalho teve como objetivo investigar a adsorção e a fotocatálise de soluções contendo a nimesulida e o 17 -estradiol com um compósito formado por carvão ativo decorado com nanopartículas de NiFe2O4. O compósito foi preparado pelo método hidrotermal utilizando o Ni(NO3)2 6 H2O e o Fe(NO3)3 9 H2O como precursores solubilizados em meio aquoso básico. A solução foi selada em um reator de Teflon e aquecida 463,15 K durante 10 h. O compósito foi caracterizado por difração de raios X, a morfologia foi observada por microscopia eletrônica de varredura e a com o magnetômetro de amostra vibrante. A nimesulida e o 17 -estradiol adsorvem segundo uma cinética de pseudo-segunda ordem. O cálculo dos parâmetros termodinâmicos de adsorção indicou que a adsorção da nimesulida ocorre de forma endotérmica, espontânea e favorável em todas as temperaturas investigadas. A magnitude da entalpia de adsorção entre a nimesulida e o carvão ativo decorado com ferrita é 90,2 kJ mol-1 o que indica que a adsorção é endotérmica e ocorre através de quimissorção. A concentração inicial da nimesulida decai 70% e a concentração do 17 -estradiol decai de 99% após 60 min de irradiação com luz UV.
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7

Ribeiro, Viviane Gomes Pereira. "Obtaining and characterization of magnetic nanosystems derived of CNSL." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10628.

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Nanotechnology has received great prominence in recent years due to the versatility of new materials and its applications at the various sectors of society. The functionalized magnetic nanoparticles have been the focus of intense research because of the ability to use on different systems, with emphasis on the catalytic processes of environmental decontamination. In particular, we have seen a growing demand for hybrid catalysts capable of utilizing sunlight, constructed from TiO2 particles by photosensitised dyes. Thus, this study aimed to develop a new magnetic nanosystem, based on use of meso-porphyrins derived from Cashew Nut Shell Liquid (CNSL), coated with TiO2, with potential application in heterogeneous photocatalysis. Moreover, produce a new ferrofluid derived biomass from the anacardic acid (AA MAG). To this end, were synthesized Fe3O4 nanoparticles with an average size of 11nm, coated with a 1st layer of oleic acid and a 2nd layer of meso-porphyrin (3-n-PDPP). This nanosystem also was covered with a layer of TiO2. This procedure produced a new magnetic nanosystem of porphyrin (NMP). The new ferrofluid AA-MAG and magnetic nanosystems were characterized by Transmission Electron Microscopy (TEM), infrared spectroscopy, Thermal analysis (TG) and magnetization curves. The results showed that NMP showed good thermal stability, superparamagnetic behavior and dimension nanometric (≈ 14nm). The fluorescent properties were little affected, which enables its application in photocatalytic systems.
A nanotecnologia vem recebendo grande destaque nos Ãltimos anos graÃas à versatilidade dos novos materiais gerados e suas aplicaÃÃes nos diversos setores da sociedade. As nanopartÃculas magnÃticas funcionalizadas tÃm sido foco de intensas pesquisas devido à capacidade de utilizaÃÃo em diferentes sistemas, com destaque para os processos catalÃticos de descontaminaÃÃo ambiental. Em especial, tem-se observado uma crescente demanda por catalisadores hÃbridos capazes de utilizar a luz solar, construÃdos a partir de partÃculas de TiO2 fotossensibilizadas por corantes. Assim, o presente trabalho teve por objetivo desenvolver um novo nanosistema magnÃtico, baseado no emprego de meso-porfirinas derivadas do LÃquido da Casca da Castanha de Caju (LCC), recobertas com TiO2, com potencial aplicaÃÃo em fotocatÃlise heterogÃnea. AlÃm disso, produzir um novo ferrofluido derivado da biomassa, a partir do Ãcido anacÃrdico (AA-MAG). Para isso, foram sintetizadas nanopartÃculas de Fe3O4 com tamanho mÃdio de 11nm, revestidas por uma 1 camada de Ãcido oleico e uma 2 camada da meso-porfirina (3-n-PDPP). Esse nanosistema tambÃm foi recoberto por uma camada de TiO2. Este procedimento produziu um segundo novo nanosistema magnÃtico de porfirina (NMP). O novo ferrofluido AA-MAG e os nanosistemas magnÃticos foram caracterizados por Microscopia eletrÃnica de trasmissÃo (MET), Espectroscopia no Infravermelho, AnÃlise tÃrmica (TG) e curvas de magnetizaÃÃo. Os resultados mostraram que o NMP apresentou uma boa estabilidade tÃrmica, comportamento superparamagnÃtico e dimensÃes nanomÃtricas (≈ 14nm). As propriedades fluorescentes foram pouco afetadas, o que possibilita sua aplicaÃÃo em sistemas fotocatalÃticos.
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8

Wickramasinghe, Sameera M. "ENGINEERING NANOMATERIALS FOR IMAGING AND ANTIBIOFILM APPLICATIONS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586446299726933.

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9

Ciccotti, Larissa. "Preparação de catalisadores magnéticos para aplicação em fotocatálise heterogênea e ozonização catalítica heterogênea de poluentes emergentes." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-02102014-080554/.

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O presente trabalho descreve a preparação de catalisadores magnéticos para aplicação nos processos de fotocatálise heterogênea e ozonização catalítica heterogênea, visando a degradação de poluentes emergentes. Primeiramente buscou-se preparar nanopartículas magnéticas para posterior aplicação no preparo de catalisadores magnéticos de TiO2. Diversas variáveis experimentais foram avaliadas na preparação das nanopartículas magnéticas, tais como: temperatura de reação, tempo de agitação, tempo no ultrasom, velocidade de agitação, velocidade de agitação da base, tempo de agitação do estabilizante, concentração da base e do estabilizante. A influência destes parâmetros de preparação no diâmetro hidrodinâmico e distribuição de tamanho das partículas foi avaliada por meio de um planejamento estatístico. Dependendo das condições experimentais, obteve-se materiais com um tamanho médio variando entre 11 e 36 nm e entre 23% e 77% de distribuição de tamanho. Na condição otimizada, obteve-se partículas com um tamanho médio, obtido pela técnica de espalhamento de luz dinâmico, de 18 nm e 21% de distribuição. O nanomaterial magnético foi utilizado para preparar os catalisadores híbridos Fe3O2@TiO2 e Fe3O4@SiO2@TiO2. Os materiais foram caracterizados por difratoemtria de raios-X (XRD), microscopia de varredura (MEV) e transmissão (TEM), espectroscopia no infravermelho (FT-IR), análise térmica (TG e DTA), espectrometria de emissão óptica (ICP-OES), medidas de área superficial (BET) e espalhamento dinâmico de luz (DLS). Os catalisadores magnéticos foram empregados na degradação dos poluentes emergentes paracetamol; 4-metilaminoantipirina (4-MAA); ibuprofeno; 17 β-estradiol; 17 α-etinilestradiol, e do fenol. Nos processos de degradação também variou-se o efeito do pH nas respostas dos sistemas. De maneira geral, o material Fe3O4@TiO2 apresentou atividade catalítica nos processos de degradação fotoquímica e de ozonização, com desempenho similar ou, em alguns casos, superior ao TiO2. Em relação a 4-MAA, obteve-se, em 60 minutos de tratamento, 25% de mineralização para o processo de fotólise e 66% para o processo de fotocatálise empregando Fe3O4@TiO2. Para o processo de ozonização em pH 3, obteve-se, em 180 minutos de tratamento, 40 e 60% de mineralização para o processo não catalítico e o processo catalítico empregando Fe3O4@TiO2, respectivamente. Os resultados utilizando-se TiO2 foram semelhantes à ozonização não catalítica, o que demonstra o efeito positivo do núcleo magnético para a atividade do material. Assim, o material híbrido multifuncional Fe3O4@TiO2 mostrou-se eficiente para a degradação de poluentes emergentes empregando-se os processos de fotocatálise e de ozonização catalítica heterogênea, possibilitando uma adicional praticidade de separação do meio de tratamento.
The present work describes the preparation of magnetic catalysts for application in heterogeneous photocatalysis and heterogeneous catalytic ozonation processes, aiming the degradation of emerging pollutants. Magnetic nanoparticles were prepered as substratum of magnetic TiO2 catalysts. Several experimental variables were evaluated in the preparation of the magnetic nanoparticles, such as temperature, stirring time, sonication time, precipitation reaction stirring speed, base addition rate, dispersion stirring time, base concentration and stabilizer percentage. The influence of these parameters on particle hydrodynamic diameter and size distribution were measured by a statistical design. Depending on the experimental conditions, materials with an average size ranging between 11 nm and 35 nm and distribution between 23% and 77% were obtained. In the optimum preparation conditions, Fe3O4 magnetic particles with a hydrodynamic diameter of 18 nm and 21% distribution were obtained. The magnetic nanomaterial was used to prepare the hybrid catalysts Fe3O4@TiO2 and Fe3O4@SiO2@TiO2. The prepared materials were characterized by X-ray diffraction (XRD), field-emiss ion scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric (TG), differential thermal analysis (DTA), inductively coupled plasma optical emission spectrometry (ICP-OES), BET specific surface area and dynamic light scattering (DLS). The magnetic catalysts were employed in the degradation of the emerging pollutants paracetamol; 4-methylaminoantipyrin (4-MAA); ibuprofen; 17 β-estradiol; 17 α-ethinyl estradiol, and phenol. In the treatment processes the effect pH on the systems was also varied. In general, the material Fe3O4@TiO2 showed catalytic activity in the processes of photochemical degradation and ozonation, with performance similar or, in some cases, superior to TiO2. For example, the 4-MAA mineralization, after 60 minutes of treatment, by the photolysis process reached a m aximum value of 25%. In the same treatment time by the photocatalytic process using Fe3O4@TiO2 it was obtained 66% of 4-MAA mineralization. For the ozonation process, in pH 3, after 180 minutes of treatment, 40% of 4-MAA mineralization was achieved by non-catalytic method. On the other hand, in the same treatment time employing Fe3O4@TiO2, 60% of 4-MAA mineralization was obtained. In addition, for the ozonation process using TiO2 similar results to non-catalytic ozonation were observed, which demonstrates the positive effect of the magnetic core for the activity of the catalyst. Thus, the hybrid material Fe3O4@TiO2 was efficient for the degradation of emerging pollutants employing the photocatalysis and heterogeneous catalytic ozonation processes, allowing an additional practicality for separating the catalyst from the treatment medium.
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Neris, Alex de Meireles. "Atividade fotocatalítica do TiO2 e do sistema core-shell CoFe2O4@TiO2 obtidos pelo método Pechini modificado." Universidade Federal da Paraí­ba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/7151.

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The need to control textile effluents due to contamination of rivers has led CONAMA to regulate and require a more efficient treatment process. Among the methods of treatment, heterogeneous catalysis stands out due to its high efficiency. The most used photocatalyst is TiO2. The combination of this material with other ones has been employed to improve its activity and/or its performance. Several systems have been tested, including the core-shell that constitutes a complete coverage of one material by another. In this work, TiO2@CoFe2O4 was synthesized by the modified-Pechini method with the addition of CoFe2O4 nanoparticles into the polymeric resin containing titanium. A magnetic material was obtained, which was characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), ultraviolet - visible spectroscopy (UV-Vis), specific surface area by the BET method. The materials were applied in the photodiscoloration of an azo dye. The pure TiO2 calcined at 700 °C showed a mixture of phases anatase / rutile in the proportions 77/23%, which was the calcination temperature which led to the highest photocatalytic activity in the discoloration of the solution yellow gold remazol (RNL). A discoloration of 81% in color of the solution was attained after 6 h of exposure to UV light, while 94% was reached after 2 h of irradiation with sunlight. With the core@shell system CoFe2O4@TiO2 synthesized with 90 % of TiO2, a mixture of anatase and rutile of 92 : 8% was obtained for a calcination temperature of 500 °C. This material showed 76% discoloration after 16 h of exposure to UV light under the same conditions used for the test with pure TiO2
A necessidade do controle de efluentes têxteis devido à contaminação de águas fluviais tem levado órgãos como o CONAMA a regulamentar e exigir um processo de tratamento mais eficiente. Dentre os métodos de tratamento estudados, os Processos Oxidativos Avançados (POA) têm demonstrado grande eficiência, como na fotocatálise heterogênea utilizando materiais semicondutores, sendo o TiO2 um dos mais empregados. A combinação deste material com outros tem sido estudada com o objetivo de melhorar a atividade e/ou performance do mesmo. Para isso vários sistemas têm sido utilizados, dentre eles o core@shell, que consiste na completa cobertura de um material por outro. Neste trabalho o CoFe2O4@TiO2 foi sintetizado pelo método Pechini modificado, com a adição do CoFe2O4 nanoparticulado à uma resina polimérica de titânio, sendo obtido um material magnético, o qual foi caracterizado por difração de raios X (DRX), espectroscopia infravermelho (IV), espectroscopia na região ultravioleta e visível (UV-Vis), análise de área superficial específica pelo método de BET. Os materiais foram testados na fotodegradação de um corante azo. O TiO2 puro calcinado a 700 ºC, apresentou mistura de fases anatase / rutilo com proporção 77 / 23 %, sendo a temperatura de calcinação que levou à maior atividade fotocatalítica na descoloração da solução de amarelo ouro remazol (RNL). Foi obtida 81 % de redução da cor da solução em 6 h de exposição a luz UV e 94 % após 2 h com irradiação de luz solar. Com o sistema core@shell CoFe2O4@TiO2 sintetizado com 90 % de TiO2 foi obtida uma mistura de 92 % de anatase e 8 % de rutilo, para uma temperatura de calcinação de 500 ºC. Este material levou a 76 % de descoloração em 16 h de exposição à luz UV com as mesmas condições utilizadas para o teste com o TiO2 puro
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Books on the topic "Magnetic photocatalyst"

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International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (2nd 2007 Kumamoto, Japan). Explosion, shock wave and hypervelocity phenomena in materials II: Selected peer reviewed papers from the 2nd International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (ESHP-2), 6-9 March 2007, Kumamoto, Japan. Stafa-Zurich, Switzerland: Trans Tech Publications, 2008.

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Book chapters on the topic "Magnetic photocatalyst"

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Bagheri, Samira, and Nurhidayatullaili Muhd Julkapli. "Easy Separation of Magnetic Photocatalyst from Aqueous Pollutants." In Nanocatalysts in Environmental Applications, 69–85. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69557-0_5.

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Lam, Sze-Mun, Jin-Chung Sin, and Abdul Rahman Mohamed. "Magnetic-Based Photocatalyst for Antibacterial Application and Catalytic Performance." In Environmental Chemistry for a Sustainable World, 195–215. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12619-3_8.

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Wang, Song Wei, Sheng Ming Xu, Song Zhe Chen, and Jing Ming Xu. "Preparation of TiO2/SiO2/(γ-Fe2O3-SiO2) Magnetic Photocatalyst." In Key Engineering Materials, 1960–63. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1960.

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Liu, Shou-Qing. "Magnetic Nano-photocatalysts: Preparation, Structure, and Application." In Environmental Chemistry for a Sustainable World, 99–117. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2442-6_4.

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"Transforming Magnetic Photocatalyst to Magnetic Dye-adsorbent Catalyst." In Nanomaterials, 165–84. Apple Academic Press, 2013. http://dx.doi.org/10.1201/b14284-15.

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Upadhyay, Prachi, Vijayanand S. Moholkar, and Sankar Chakma. "Magnetic nanomaterials-based photocatalyst for wastewater treatment." In Handbook of Nanomaterials for Wastewater Treatment, 241–76. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821496-1.00008-8.

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"Key Concepts on Transforming Magnetic Photocatalyst to Magnetic Dye-Adsorbent Catalyst." In Key Engineering Materials, Volume 1, 131–48. Apple Academic Press, 2014. http://dx.doi.org/10.1201/b16588-15.

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Emam, Ahmed Nabile, Ahmed Sadek Mansour, Emad Girgis, and Mona Bakr Mohamed. "Hybrid Plasmonic Nanostructures." In Pharmaceutical Sciences, 1193–211. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1762-7.ch046.

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Plasmonic hybrid nanostructure including Semiconductor-metallic nanoparticles, and graphene-plasmonic nanocomposites have great potential to be used as photocatalyst for hydrogen production and for photodegradation of organic waste. Also, they are potential candidate as active materials in photovoltaic devices. Plasmonic-magnetic nanocomposites could be used in photothermal therapy and biomedical imaging. This chapter will focus on the environmental impact of these materials and their in-vitro and in-vivo toxicity. In addition, the applications of these hybrid nanostructures in energy and environment will be discussed in details.
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"The Magnetic Photocatalyst Conversion to the Magnetic Dye-Adsorbent Catalyst via Hydrothermal Followed by Typical Washing and Thermal Treatments." In Materials Science of Polymers, 341–56. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18524-24.

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Abbasi, Zahra, and Elisa I. García-López. "Iron oxide-based magnetic photocatalysts: Recent developments, challenges, and environmental applications." In Materials Science in Photocatalysis, 235–53. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821859-4.00009-x.

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Conference papers on the topic "Magnetic photocatalyst"

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Kurinobu, S., K. Tsurusaki, M. Hasegawa, and K. Kimata. "Decomposition of organic substances using magnetic titania photocatalyst particles." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464209.

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Cao, Qian Wen, Yue Wan, and Xu Chun Song. "Photodegradation of Rhodamine B Using Fe3O4@SiO2@BiOBr Magnetic Photocatalyst." In The Joint Conferences of 2015 International Conference on Computer Science and Engineering Technology (CSET2015) and 2015 International Conference on Medical Science and Biological Engineering (MSBE2015). WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814651011_0101.

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Xuening Fei, Xiaojuan Xu, Guozhi Jia, and Qiuli Li. "Notice of Retraction: Preparation and photocatalytic activity of magnetic Fe3O4/TiO2 photocatalyst." In 2010 2nd Conference on Environmental Science and Information Application Technology (ESIAT 2010). IEEE, 2010. http://dx.doi.org/10.1109/esiat.2010.5568526.

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Prasetya, Nurdiyantoro Putra, Budi Legowo, Utari, and Budi Purnama. "Gamma irradiation effect of fine sediment magnetic as photocatalysts materials." In INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS2020). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0030383.

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Barquín, Carmen, Laura Rancaño, María J. Rivero, and Inmaculada Ortiz. "Improved Performance of a Newly Synthesized Magnetite Photocatalyst for S-Metolachlor Degradation." In 14th Mediterranean Congress of Chemical Engineering (MeCCE14). Grupo Pacífico, 2020. http://dx.doi.org/10.48158/mecce-14.dg.09.19.

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