Relevant bibliographies by topics / Photocatalyst

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Photocatalyst'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 June 2025

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Journal articles on the topic "Photocatalyst"

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Chuaicham, Chitiphon, Jirawat Trakulmututa, Kaiqian Shu, et al. "Recent Clay-Based Photocatalysts for Wastewater Treatment." Separations 10, no. 2 (2023): 77. http://dx.doi.org/10.3390/separations10020077.

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Photocatalysis is a remarkable methodology that is popular and applied in different interdisciplinary research areas such as the degradation of hazardous organic contaminants in wastewater. In recent years, clay-based photocatalyst composites have attracted significant attention in the field of photocatalysis owing to their abundance, excellent light response ability, and stability. This review describes the combination of clay with focusing photocatalysts such as TiO2, g-C3N4, and Bi-based compounds for degrading organic pollutants in wastewater. Clay-based composites have more active surface sites, resulting in inhibited photocatalyst particle agglomeration. Moreover, clay enhances the creation of active radicals for organic pollutant degradation by separating photogenerated electrons and holes. Thus, the functions of clay in clay-based photocatalysts are not only to act as a template to inhibit the agglomeration of the main photocatalysts but also to suppress charge recombination, which may lengthen the electron–hole pair’s lifespan and boost degrading activity. Moreover, several types of clay-based photocatalysts, such as the clay type and main photocatalyst, were compared to understand the function of clay and the interaction of clay with the main photocatalyst. Thus, this study summarizes the recent clay-based photocatalysts for wastewater remediation and concludes that clay-based photocatalysts have considerable potential for low-cost, solar-powered environmental treatment.
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Rocha, Rafael Lisandro P., Luzia Maria C. Honorio, Roosevelt Delano de S. Bezerra, et al. "Light-Activated Hydroxyapatite Photocatalysts: New Environmentally-Friendly Materials to Mitigate Pollutants." Minerals 12, no. 5 (2022): 525. http://dx.doi.org/10.3390/min12050525.

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This review focuses on a reasoned search for articles to treat contaminated water using hydroxyapatite (HAp)-based compounds. In addition, the fundamentals of heterogeneous photocatalysis were considered, combined with parameters that affect the pollutants’ degradation using hydroxyapatite-based photocatalyst design and strategies of this photocatalyst, and the challenges of and perspectives on the development of these materials. Many critical applications have been analyzed to degrade dyes, drugs, and pesticides using HAp-based photocatalysts. This systematic review highlights the recent state-of-the-art advances that enable new paths and good-quality preparations of HAp-derived photocatalysts for photocatalysis.
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Wang, Shifa, Peilin Mo, Dengfeng Li, and Asad Syed. "Intelligent Algorithms Enable Photocatalyst Design and Performance Prediction." Catalysts 14, no. 4 (2024): 217. http://dx.doi.org/10.3390/catal14040217.

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Photocatalysts have made great contributions to the degradation of pollutants to achieve environmental purification. The traditional method of developing new photocatalysts is to design and perform a large number of experiments to continuously try to obtain efficient photocatalysts that can degrade pollutants, which is time-consuming, costly, and does not necessarily achieve the best performance of the photocatalyst. The rapid development of photocatalysis has been accelerated by the rapid development of artificial intelligence. Intelligent algorithms can be utilized to design photocatalysts and predict photocatalytic performance, resulting in a reduction in development time and the cost of new catalysts. In this paper, the intelligent algorithms for photocatalyst design and photocatalytic performance prediction are reviewed, especially the artificial neural network model and the model optimized by an intelligent algorithm. A detailed discussion is given on the advantages and disadvantages of the neural network model, as well as its application in photocatalysis optimized by intelligent algorithms. The use of intelligent algorithms in photocatalysis is challenging and long term due to the lack of suitable neural network models for predicting the photocatalytic performance of photocatalysts. The prediction of photocatalytic performance of photocatalysts can be aided by the combination of various intelligent optimization algorithms and neural network models, but it is only useful in the early stages. Intelligent algorithms can be used to design photocatalysts and predict their photocatalytic performance, which is a promising technology.
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Yanda, Bhupesh Pydiraju, Dharani Sathwik Ram Panchagnula, Terry J. Gentry, and Sreeram Vaddiraju. "Photocatalysis-Assisted Water Remediation Using Porous Nanowire Foams." Water 17, no. 4 (2025): 462. https://doi.org/10.3390/w17040462.

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Deployment of photocatalysis for water disinfection necessitates engineering the process kinetics and achieving the complete recovery of the photocatalyst following the remediation of water. The recovery of the photocatalysts, especially nanostructured photocatalysts, remains a challenge, as indicated by a previous study by our group where only 57% of TiO2 nanowires were recovered by gravity-assisted settling and sedimentation from water after its photocatalysis-assisted E. coli inactivation. To overcome this challenge, a novel method involving the use of photocatalysts in the form of porous foams is developed and presented. Use of TiO2 nanowire foams led to a 2–3-log reduction of E. coli in a span of 180 min when ultraviolet-A (UV-A) light was employed for photoactivation, similar to that observed previously by our group. More importantly, the photocatalyst foams were easily recoverable from water via mechanical separation using tweezers, which in this study led to a recovery of 98–99% of the TiO2 nanowire photocatalysts. This strategy allows for further optimization of both the process kinetics and the total amount of photocatalysts needed for water remediation through optimization of the porosities and the geometries of the foams and ensuring that all the photocatalyst surfaces remain accessible to both the pollutants and light.
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Li, Bin, Xin Yi Wang, and Xiao Gang Yang. "Effect of Mixing Ratio and Doping Acid on the Photocatalytic Properties of PANI-BiVO4 Composites." Key Engineering Materials 727 (January 2017): 866–69. http://dx.doi.org/10.4028/www.scientific.net/kem.727.866.

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BiVO4 photocatalyst prepared by hydrothermal method was mixed with polyaniline (PANI). The phase structure, morphology and optical properties of PANI-BiVO4 photocatalysts were analyzed through X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). The results showed that the optimal preparation conditions of composite photocatalyst were 0.5wt.% PANI mixing ratio and H3PO4 as doping acid. The photocatalysis degradation rate is the highest. This new heterogeneous structure photocatalyst is expected to show considerably potential applications in solar-driven environmental pollution cleanup.
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You, Wei. "Research Progresses and Development Trends of High-Efficacy Photocatalysts." Applied Mechanics and Materials 496-500 (January 2014): 532–35. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.532.

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Progresses of research on high-efficacy photocatalyst were introduced in this paper. Firstly, efficiency-strengthening methods of TiO2-serie photocatalysts were summarized basing on collected literatures, including photosensitization, alloying, moreover, novel photocatalysis materials and technologies and probable development tendencies in the future were introduced, such as broad-spectrum photocatalysts, broad-energy and energy-sensitive catalysts and high-efficacy controllable high-power photocatalysis materials and equipments.
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Gusarov, Sergey. "Advances in Computational Methods for Modeling Photocatalytic Reactions: A Review of Recent Developments." Materials 17, no. 9 (2024): 2119. http://dx.doi.org/10.3390/ma17092119.

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Photocatalysis is a fascinating process in which a photocatalyst plays a pivotal role in driving a chemical reaction when exposed to light. Its capacity to harness light energy triggers a cascade of reactions that lead to the formation of intermediate compounds, culminating in the desired final product(s). The essence of this process is the interaction between the photocatalyst’s excited state and its specific interactions with reactants, resulting in the creation of intermediates. The process’s appeal is further enhanced by its cyclic nature—the photocatalyst is rejuvenated after each cycle, ensuring ongoing and sustainable catalytic action. Nevertheless, comprehending the photocatalytic process through the modeling of photoactive materials and molecular devices demands advanced computational techniques founded on effective quantum chemistry methods, multiscale modeling, and machine learning. This review analyzes contemporary theoretical methods, spanning a range of lengths and accuracy scales, and assesses the strengths and limitations of these methods. It also explores the future challenges in modeling complex nano-photocatalysts, underscoring the necessity of integrating various methods hierarchically to optimize resource distribution across different scales. Additionally, the discussion includes the role of excited state chemistry, a crucial element in understanding photocatalysis.
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Ahmad, Abdul Latif, Jing Yi Chin, Abdul Majeed Alaudin, and Norhanis Farhana Mohd Masri. "Influence of TiO2 Phases and Operational Parameters on Photocatalytic Degradation of Methyl Orange." Journal of Physical Science 35, no. 2 (2024): 65–82. http://dx.doi.org/10.21315/jps2024.35.2.5.

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In the textile industry, the wastewater produced consists of large amount of dyes. These dyes possess harm to environmental and public health. TiO2 is one of the most common photocatalysts, however studies about degradation efficiency of dye using different phases of TiO2 is scared. Employing photocatalysis, the novelty of this study is to compare methyl orange (MO) degradation efficiency of pure phases of photocatalysts TiO2 (anatase, rutile and brookite) in terms of their photochemical properties and underlying photocatalytic mechanism. Characterisation evaluations including scanning electron microscopy (SEM), fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) were carried out to assess morphology, chemical structure, crystal structure and electron transfer resistance of the photocatalysts. MO adsorption-photocatalysis removal percentage by pure phase TiO2, which are anatase, brookite and rutile were attained at 57%, 48% and 19%, respectively. The main reason that contributes to high degradation rate of MO by TiO2-anatase could be due to the good dye-photocatalyst affinity and the least electron transfer resistance. Besides, other affecting parameters such as initial concentration of photocatalyst, initial concentration of dye and pH of the dye solution were evaluated. It was found that photocatalytic efficiency was enhanced with increasing initial concentration of photocatalyst from 0.25 mg/mL to 1 mg/mL (degradation improved from 50% to 80%), with decreasing initial dye concentration and under acidic condition.
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Li, Xue, Ulla Simon, Maged F. Bekheet, and Aleksander Gurlo. "Mineral-Supported Photocatalysts: A Review of Materials, Mechanisms and Environmental Applications." Energies 15, no. 15 (2022): 5607. http://dx.doi.org/10.3390/en15155607.

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Although they are of significant importance for environmental applications, the industrialization of photocatalytic techniques still faces many difficulties, and the most urgent concern is cost control. Natural minerals possess abundant chemical inertia and cost-efficiency, which is suitable for hybridizing with various effective photocatalysts. The use of natural minerals in photocatalytic systems can not only significantly decrease the pure photocatalyst dosage but can also produce a favorable synergistic effect between photocatalyst and mineral substrate. This review article discusses the current progress regarding the use of various mineral classes in photocatalytic applications. Owing to their unique structures, large surface area, and negatively charged surface, silicate minerals could enhance the adsorption capacity, reduce particle aggregation, and promote photogenerated electron-hole pair separation for hybrid photocatalysts. Moreover, controlling the morphology and structure properties of these materials could have a great influence on their light-harvesting ability and photocatalytic activity. Composed of silica and alumina or magnesia, some silicate minerals possess unique orderly organized porous or layered structures, which are proper templates to modify the photocatalyst framework. The non-silicate minerals (referred to carbonate and carbon-based minerals, sulfate, and sulfide minerals and other special minerals) can function not only as catalyst supports but also as photocatalysts after special modification due to their unique chemical formula and impurities. The dye-sensitized minerals, as another natural mineral application in photocatalysis, are proved to be superior photocatalysts for hydrogen evolution and wastewater treatment. This work aims to provide a complete research overview of the mineral-supported photocatalysts and summarizes the common synergistic effects between different mineral substrates and photocatalysts as well as to inspire more possibilities for natural mineral application in photocatalysis.
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Yang, Ling. "Photocatalyst and Decoration Design in Indoor Public Spaces Based on the Photocatalytic Function of Nanometer Titanium Dioxide." Advances in Materials Science and Engineering 2022 (August 10, 2022): 1–10. http://dx.doi.org/10.1155/2022/1937481.

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The process of decorating interior spaces often produces substances that are harmful to the human body, which seriously spoils the decorating experience. Photocatalyst is the oxidant of nanometer titanium dioxide. It cannot be oxidized by itself. This article aims to discuss photocatalysts and interior and exterior design. When there is light in the room, the photocatalyst will fully integrate with the light, which has a strong catalytic and degrading effect. This can degrade indoor formaldehyde and other pollutants while also having a sterilization effect. The principle of the photocatalyst is to absorb ultraviolet rays in light. When impurities appear in the air, they are destroyed by the photocatalyst, and the impurities are converted into substances that are harmless to the human body. We tested the formaldehyde and SO2 content in the room after the photocatalysis of titanium dioxide, and analyzed the photocatalyst and decoration design in indoor public spaces. The research results showed that the effect of the photocatalyst is about 20% better than the traditional explanation. Functionally, it can deodorize toilets, garbage, etc., and the effect is very obvious.
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Dissertations / Theses on the topic "Photocatalyst"

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Ahmad, Ayla. "Synthesis and Evaluation of Photocatalytic Properties of BiOBr for Wastewater Treatment Applications." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/30301.

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Visible light-driven photocatalysis has shown considerable potential in the area of clean and renewable energy, as well as in wastewater treatment. This thesis describes the synthesis, characterization and applicability of a visible-light active photocatalyst, bismuth oxybromide (BiOBr). The photocatalytic activity of BiOBr was investigated through its preparation via hydrothermal and solvothermal synthesis routes under various conditions. Hydrothermal catalyst was prepared using non template based method while for solvothermal synthesis CTAB was used as a template. Parameters of temperature and time of thermal treatment were optimized for each synthesis method and overall tests for catalyst dosage and recyclability were performed. An overall optimal route leading to high photocatalytic performance was also proposed based on the obtained results. Studies were also conducted to examine the applicability of optimally synthesized BiOBr in drinking water applications by studying catalyst-mediated disinfection of E. coli and degradation of phenol. Favourable results were obtained, confirming the prospective application of BiOBr as a viable photocatalyst for disinfection. Furthermore, the potential of enhancing BiOBr to further improve its performance is described through synthesis of a novel PdCl2/BiOBr based photocatalyst. Overall, the performance of BiOBr under various conditions in this study establishes its potential as a holistic photocatalyst and merits further development.
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Sundararajan, Mayur. "Amorphous Semiconductors: From Photocatalyst to Computer Memory." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1490967991624172.

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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 &alpha;-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&deg;C por 48 h; (2) Partículas de &alpha;-Fe2O3/TiO2 foram obtidas por heterocoagulação de oxi-hidróxidos de Ti(IV) sobre as partículas de &alpha;-Fe2O3, as quais foram calcinada a 500&deg;C por 2 h; e (3) As partículas \"casaca/caroço\" do fotocatalisador foram obtidas por calcinação a 400&deg;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.<br>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) &alpha;-Fe2O3 particles were obtained, by precipitation, from FeCl3.6H2O 0.01 mol L-1, which underwent a forced acid hydrolysis at 100&deg;C for 48 h; (2) &alpha;-Fe2O3/TiO2 particles were obtained, by heterocoagulation, of Ti(IV) oxide species on the &alpha;-Fe2O3, followed by calcination at 500&deg;C for 2 h; and (3) The core/shell photocatalyst particles were obtained by calcination the &alpha;-Fe2O3/TiO2 particles at 400&deg;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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Fan, Ka Ho. "Synthesis and evaluation of macroporous TiO2 composite photocatalyst /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20FAN.

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Mole, Jonathan Michael. "Titanium dioxide as a photocatalyst in water purification." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309747.

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Montoya, Anthony Tristan. "Synthesis of carbon nitrides and composite photocatalyst materials." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6479.

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This thesis describes the synthesis, characterization and photocatalytic applications of carbon nitride (C3N4) and titanium dioxide (TiO2) materials. C3N4 was prepared from the thermal decomposition of a trichloromelamine (TCM) precursor. Several different reactor designs and decomposition temperatures were used to produce chemically and thermally stable orange powders. These methods included a low temperature glass Schlenk reactor, a high mass scale stainless steel reactor, and decomposition at higher temperatures by the immersion of a Schlenk tube into a furnace. These products share many of the same structural and chemical properties when produced by these different methods compared to products from more common alternate precursors in the literature, determined by infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and elemental analysis. C3N4 is capable of utilizing light for photocatalysis due to its moderate band gap (Eg), measured to be between 2.2 and 2.5 eV. This enables C3N4 to be used in the photocatalytic degradation of organic dyes and the production of hydrogen via the water-splitting reaction. C3N4 degraded methylene blue dye to less than 10% of its initial concentration in less than an hour of UV light illumination and 60% under filtered visible light in 150 minutes. It also degraded methyl orange dye to below 20% in 70 minutes under UV light and below 60% in 150 minutes under visible light. Using precious metal co-catalysts (Pt, Pd, and Ag) photo-reduced onto the surface of C3N4, hydrogen was produced from a 10% aqueous solution of triethanolamine at rates as high as 260 μmol h-1 g-1. C3N4 was also modified by mixing the precursor with different salts (NaCl, KBr, KI, KSCN, and NH4SCN) as hard templates. Many of these salts reacted with TCM by exchanging the anion with the chlorine in TCM. The products were mostly prepared using the high temperature Schlenk tube reactor, and resulted in yellow, orange, or tan-brown products with Eg values between 2.2 and 2.7 eV. Each of these products had subtle differences in the IR spectra and elemental composition. The morphology of these C3N4 products appeared to be more porous than unmodified C3N4, and the surface area for some increased by a factor of 4. These products demonstrated increased activity for photocatalytic hydrogen evolution, with the product from TCM-KI reaching a peak rate as high as 1,300 µmol h-1 g-1. C3N4 was coated onto metal oxide supports (SiO2, Al2O3, TiO2, and WO3) with the goal of utilizing enhanced surface area of the support or synergy between two different semiconductors. These products typically required higher temperature synthesis conditions in order to fully form. The compositions of the SiO2 and Al2O3 products were richer in nitrogen and hydrogen compared to unmodified C3N4. The higher temperature reactions with C3N4 and WO3 resulted in the formation of the HxWO3 phase, and an alternate approach of coating WO3 on C3N4 was used. The degradation of methyl orange showed a significant increase in adsorption of dye for the composites with SiO2 and Al2O3, which was not seen with any of the individual components. The composite between C3N4 and TiO2 showed improved activity for hydrogen evolution compared to unmodified C3N4. The surface of TiO2 was modified by the reductive photodeposition of several first row transition metals (Mn, Fe, Co, Ni, and Cu). This process resulted in the slight color change of the white powder to shades of light yellow, blue or grey. Bulk elemental analysis showed that these products contained between 0.04-0.6 at% of the added metal, which was lower than the targeted deposit amount. The Cu modified TiO2 had the largest enhancement of photocatalytic hydrogen evolution activity with a rate of 8,500 µmol h-1 g-1, a factor of 17 higher than unmodified TiO2.
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Kashiwaya, Shun. "Science de surface et propriétés chimiques d'hétérostructures NiO/TiO2 monocristallin." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0241/document.

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Les photocatalyseurs à base de TiO2 ont été l’objet d’une grande attention comme une méthode durable de purification de l’air ou de l’eau, et de production d’hydrogène par décomposition de l’eau. Une stratégie avantageuse consiste à développer des héterostructures par couplage avec un autre oxyde métallique former une jonction de type Schottky ou avec un autre oxyde métallique pour créer une jonction p-n à l’interface de manière à prévenir les recombinaisons via une séparation de charge « vectorielle » à ces jonctions. De plus, les facettes cristallines jouent un rôle crucial dans le piégeage des porteurs de charge et, donc,dans les réactions rédox photoactivées. Ainsi, le dépôt sélectif de métal ou d’oxyde métallique sur des facettes spécifiques de nanocristaux de TiO2 devrait augmenter l’activité photocatalytique par l’amélioration de la séparation des charges. Dans ce travail, nous avons combiné l’emploi du cocatalyseur de type p NiO pour former des jonctions p-n avec son dépôt sélectif sur des nanocristaux de TiO2 anatase exposant des facettes bien définies. Par ailleurs, des expériences modèles de physique de surface ont été menées pour étudier les propriétés électroniques de ces hétérojonctions<br>TiO2 photocatalysts have attracted attention as a sustainable method for water/air purification and hydrogen production by water splitting. An advantageous strategy is the development of heterostructures by coupling metal oxides to create a p-n junction at their interface in order to prevent there combination by vectorial charge carrier separation at these energy junctions. In addition, crystal facets play a decisive role in the trapping of charge carriers and thus photocatalytic redox reactions. Thus, selective deposition of metal or metal oxides onto specific facets would enhance the photocatalytic activity by improving charge separation. In this work, we have combined the usage of p-type NiO co-catalyst to form p-n junction with its selective deposition onto the specific facet of oriented TiO2nanocrystal photocatalysts. Furthermore, the physical model experiments have been performed to investigate the electronic properties of these heterojunctions
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Yamamoto, 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.

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Zhang, Xingmo. "Synthesis, characterization and photocatalyst application of CH3NH3PbBr3 single crystals." Thesis, The University of Sydney, 2020. https://hdl.handle.net/2123/22427.

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Organic-inorganic hybrid perovskites, which combine the advantages of superior optoelectronic properties and solution-processed manufacturing, have emerged as the new class of revolutionary materials with great potential for various practical applications. Encouraged by the longer carrier diffusion length, higher carrier mobility and better optoelectronic properties than their polycrystalline counterparts, increasing research effort has been focused on the preparation and optimization of perovskite single crystals using various solution-synthesis techniques for controlling the morphology and promoting their wide optoelectronic applications. In this regard, further clarifying the microstructure as well as charge carrier transporting behaviors and loss mechanisms within perovskite single crystals will be greatly rewarding, which would further guide to further improve the relevant device performance. Moreover, it would be also of great significance to broaden the device applications of single crystals, considering the excellent optoelectronic properties and their related stability nature and facile processing. In the first work, I synthesized methylammonium lead bromide CH3NH3PbBr3 thin single crystals on Fluorine-doped tin oxide glass (FTO) substrates and Si/SiO2 substrates and characterized their morphology and phase purity, and I found that there are solution residuals on the surfaces and around the single crystals. I further characterized the microstructure and elemental composition, and the charge transport properties of the perovskite thin single-crystals. I found there were two kinds of solution residuals: small perovskite crystals or the mixture of perovskite and PbBr2, which was difficult to be removed and would hinder charge transportation of single-crystalline devices. Hydrogen (H2) production using suitable semiconductors through the photocatalytic water splitting process is a much sought-after technology to reduce greenhouse gases and to further contribute to clean solar hydrogen energy production. To date, it is still a big challenge to find stable semiconductor photocatalysts responding to wide-ranged light illumination. Recently, lead halide perovskites have emerged as promising candidates for the high-performance photocatalysts beyond various other optoelectronic devices owing to their excellent optoelectronic properties. However, most of the previous works on perovskite photocatalysts employed the form of polycrystalline thin films, which still suffer from instability due to water and inherent performance. In my second work, we synthesized the high-quality CH¬3NH3PbBr3 single crystals by the inversed-temperature crystallization method and investigated their performance as a photocathode for water splitting with a simple device structure. An optimized perovskite crystal exhibits a good water-splitting photocurrent density of 0.51 mA cm-2 at 0 V vs. Reversible Hydrogen Electrode (RHE) under the white light illumination. Such devices showed improved stability with no obvious decrease over 600 s. Our work highlights the potential of hybrid perovskite single crystals as photocathodes for photocatalysis in neutral solution.
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Wang, 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.

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Books on the topic "Photocatalyst"

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Gurylev, Vitaly. Nanostructured Photocatalyst via Defect Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81911-8.

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Prakash, Jai, Junghyun Cho, Bruno Campos Janegitz, and Shuhui Sun, eds. Multifunctional Hybrid Semiconductor Photocatalyst Nanomaterials. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-39481-2.

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Akbari, Hashem. Evaluation of titanium dioxide as a photocatalyst for removing air pollutants: PIER final project report. California Energy Commission, 2008.

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Akbari, Hashem. Evaluation of titanium dioxide as a photocatalyst for removing air pollutants: PIER final project report. California Energy Commission, 2008.

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Naushad, Mu, Saravanan Rajendran, and Eric Lichtfouse, eds. Green Photocatalysts. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-15608-4.

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Yamashita, Hiromi, and Hexing Li, eds. Nanostructured Photocatalysts. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2.

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Schneider, Jenny, Detlef Bahnemann, Jinhua Ye, Gianluca Li Puma, and Dionysios D. Dionysiou, eds. Photocatalysis. Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782622338.

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Dionysiou, Dionysios D., Gianluca Li Puma, Jinhua Ye, Jenny Schneider, and Detlef Bahnemann, eds. Photocatalysis. Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782627104.

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Bignozzi, Carlo Alberto, ed. Photocatalysis. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22294-8.

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Zhang, Jinlong, Baozhu Tian, Lingzhi Wang, Mingyang Xing, and Juying Lei. Photocatalysis. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2113-9.

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Book chapters on the topic "Photocatalyst"

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Onishi, Taku. "Photocatalyst." In Quantum Computational Chemistry. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5933-9_12.

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Leonardo, Palmisano. "Photocatalyst." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-40872-4_461-2.

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Ohtani, Bunsho. "Photocatalyst." In Encyclopedia of Applied Electrochemistry. Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-6996-5_497.

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Bhagat, B. R., and Alpa Dashora. "Photocatalyst." In Energy Conversion and Green Energy Storage. CRC Press, 2022. http://dx.doi.org/10.1201/9781003258209-2.

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Irie, Hiroshi. "TiO2 Photocatalyst." In Encyclopedia of Applied Electrochemistry. Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-6996-5_503.

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Martin, David James. "Oxygen Evolving Photocatalyst Development." In Springer Theses. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18488-3_3.

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Martin, David James. "Hydrogen Evolving Photocatalyst Development." In Springer Theses. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18488-3_4.

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Gurylev, Vitaly. "Photocatalysis: Fundamentals." In Nanostructured Photocatalyst via Defect Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81911-8_1.

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Durgalakshmi, D., R. Ajay Rakkesh, Saravanan Rajendran, and Mu Naushad. "Green Photocatalyst for Diverge Applications." In Environmental Chemistry for a Sustainable World. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17638-9_1.

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Choudhury, Biswajit. "Carbon Nitride: A Wonder Photocatalyst." In Environmental Chemistry for a Sustainable World. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10609-6_6.

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Conference papers on the topic "Photocatalyst"

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Arakawa, Hironori, Zhigang Zou, Kazuhiro Sayama, and Ryu Abe. "Solar Hydrogen Production: Direct Water Splitting Into Hydrogen and Oxygen by New Photocatalysts Under Visible Light Irradiation." In ASME 2003 International Solar Energy Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/isec2003-44301.

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The photocatalytic splitting of water into hydrogen and oxygen using solar energy is one of the most attractive renewable sources of hydrogen fuel. Therefore, considerable efforts have been paid in developing photocatalysts capable of using visible light, which accounts for about 43% of the solar energy. However such a photocatalyst has not been developed so far. We have developed a new Ni-doped indium-tantalum oxide photocatalyst, In1-xNixTaO4 (x = 0.0∼0.2), which induced direct splitting of water into stoichiometric amount of oxygen and hydrogen under visible light irradiation with a quantum yield of about 0.66% at 420.7 nm. We have also developed a new two-step water splitting system using two different semiconductor photocatalysts, Pt/WO3 photocatalyst for oxygen evolution and Pt/SrTiO3(Cr-Ta-doped) photocatalyst for hydrogen evolution, and a redox mediator, I−/IO3−, mimicking the Z-scheme mechanism of the natural photosynthesis. The quantum yield of this system was about 0.1% at 420.7nm. Both photocatalytic methods are the first examples for visible light water splitting system in the world.
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Šalipur, Hristina, K. M. Kamal, Anže Prašnikar, et al. "INFLUENCE OF ALCOHOLS AS SACRIFICAL AGENTS IN PHOTOCATALYTIC HYDROGEN PRODUCTION OVER Pt-N/TiO2." In 17th International Conference on Fundamental and Applied Aspects of Physical Chemistry. Society of Physical Chemists of Serbia, 2024. https://doi.org/10.46793/phys.chem24i.101s.

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Pt-N/TiO2 photocatalysts were synthetized by the alkaline hydrothermal method. Physico-chemical properties of the photocatalysts were obtained by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Activity of the Pt-N/TiO2 photocatalyst towards hydrogen production was studied in reactions of water splitting and photoreforming of different alcohols. The effect of alcohol structure and the nature of photodecomposition intermediates on hydrogen production rate was discussed. Obtained results highlighted the role of sacrificial agents in photocatalytic hydrogen production.
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Mohd Amin, NUR AIN ATIQAH. "Preliminary synthesis of the TiO2 photocatalyst for hydrogen production." In Decarbonization Technology: ICDT2024. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903575-59.

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Abstract. The preliminary analysis of the proposed work, specifically the development of the titanium dioxide (TiO2) photocatalyst, was described in this chapter. The results of the analysis are useful for comparing the composite structures of TiO2 photocatalysts with different calcination temperatures. Various crystalline and amorphous structures of TiO2, such as anatase, rutile, and brookite, have garnered significant attention for their diverse applications. This study investigates the synthesis, characterization, and performance evaluation of TiO2 photocatalysts for hydrogen production applications. TiO2, known for its stability, non-toxicity, and low cost, has garnered significant interest due to its unique properties. Utilizing various experimental methods including sol-gel hydrothermal synthesis and calcination at different temperatures, the researchers synthesized anatase and rutile TiO2 photocatalysts. Characterization techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), surface area analysis, electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV) were employed to analyze the structural and performance properties of the photocatalysts. Results revealed that calcination temperature significantly influenced the crystallinity, particle size, surface area, and pore structure of TiO2, with an optimal temperature of 500°C yielding superior photocatalytic activity. Electrochemical analysis indicated smoother photocharge carrier transfer kinetics and enhanced photo electrocatalytic activity for TiO2 calcined at 500°C, highlighting its potential for efficient hydrogen production. This comprehensive investigation contributes valuable insights into the development of sustainable TiO2 photocatalysts for clean energy applications.
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Zhuo Luo, Shiying Zhang, Difa Xu, Yang You, and Zhongxin Lin. "Composite photocatalyst of Glass-Microspheres/TiO2:Synthesis and photocatalysis activity." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5966097.

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Liu, Peng, Zhiyuan Yang, and Pan Ran. "Preparation and photocatalysis properties of La-doped nano-NiO novel photocatalyst." In Second International Conference on Smart Materials and Nanotechnology in Engineering, edited by Jinsong Leng, Anand K. Asundi, and Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.840080.

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Chen, Yen-Shin, Bo-Kai Chao, Tadaaki Nagao, and Chun-Hway Hsueh. "Improvement of Photocatalytic Efficiency by Adding Ag Nanoparticles and Reduced Graphene Oxide to TiO2." In JSAP-OSA Joint Symposia. Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5p_a410_12.

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Titanium dioxide (TiO2) is the commonly used photocatalyst. However, because only a small ultraviolet portion of solar spectrum can excite the electron-hole pairs resulting from the large band gap (3.2 eV) [1] and the recombination rate is high, its efficiency is restrained. To overcome this drawback, we added silver nanoparticles and reduced graphene oxide (RGO) to construct the ternary plasmonic catalyst to improve the catalytic performance of TiO2 nanopowder (P25). We prepared three different geometries of Ag nanostructures including sphere, decahedron and prism because the plasmon resonance properties of Ag could be controlled by the morphology of Ag nanoparticle, which shows characteristic strong localized surface plasmon resonance (LSPR) leading to an increase in light absorption [2]. The incorporated RGO inhibited the charge recombination and enhanced the electron-hole separation. In this study, Ag nanodecahedrons/P25/RGO and Ag nano-prisms/P25/RGO hybrid photocatalysts possessed remarkable photocatalytic activity, which displayed over 8 times higher photocatalytic efficiency than the P25 photocatalyst.
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A., Alfiya, Pranavya J. R., Indu M. S, and Sajithkumar K. J. "Comparative Assessment of Continuous Flow Photocatalytic Oxidation Reactors for Organic Wastewater Degradation." In 6th International Conference on Modeling and Simulation in Civil Engineering. AIJR Publisher, 2023. http://dx.doi.org/10.21467/proceedings.156.20.

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Photocatalysis is an environmentally friendly technique for removing organic pollutants such as dyes, pesticides, etc. The photo reactors could be of the slurry type and fixed bed type. Continuous flow photocatalytic reactors generally are fixed bed-type reactors. Slurry type designs like loop thin-film slurry flat-plate photoreactors, step aeration slurry reactors etc. were also tried out for continuous flow operations. Continuous flow photocatalytic reactors have become one of the most ensuring methods for the treatment of mass water. However, uniform dispersion of the photocatalyst within the wastewater volume is still existing as a challenge. Different reactor designs like immobilized bed reactors (packed bed reactor and fluidized bed reactor), annular reactor with photocatalyst coated on inner/outer cylinder, photocatalytic membrane reactors, tubular reactors, microreactors, etc. are tested for their efficiency. This review tries to provide a generalized comparison of the relative merits and demerits of these reactor designs and immobilization methods on the degradation of organic contaminants.
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Li, Songtian, Yonghua Cheng, and Hang Gao. "Preparation, Characterization and Photocatalysis Properties of Visible Spectral Response Photocatalyst CoPcS/TiO2/K2Ti4O9." In 2010 International Conference on Challenges in Environmental Science and Computer Engineering. IEEE, 2010. http://dx.doi.org/10.1109/cesce.2010.190.

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Lelis, Martynas, Simona Tuckute, Emilija Demikyte, et al. "Synthesis and Repetitive Application of Nanocrystalline ZnO Based Floating Photocatalyst for the Detoxification of Water from Bacteria and Viruses Mixtures." In Nanotech France 2022 International Conference. SETCOR Conferences and Events, 2022. http://dx.doi.org/10.26799/cp-nanotechfrance2022/1.

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Usually, the most efficient photocatalyst materials are synthesized as fine nanocrystalline powders and this rises significant handling and repetitive application issues. More recently, researchers started to immobilize photocatalyst (nano)materials on relatively large low density supports creating floating photocatalyst particles. Such approach allows to effectively retrieve and re-apply the used photocatalyst material. In current study we used reactive magnetron sputtering technique and deposited unconventional orange colour nanocrystalline ZnO based photocatalyst on floating high-density polyethylene (HDPE) grains. The structure of the synthesized photocatalyst was characterized by XRD, SEM, and XPS techniques. The repetitive measurements of Rhodamine B (RhB) dye bleaching by the ZnO based photocatalyst film under visible light irradiation showed high stability over ten cycles. Visible light induced photocatalytic efficiency of the floating photocatalyst grains (FPG) was also estimated by the repetitive treatment of water samples containing Salmonella typhimurium (strain SL1344) and Micrococcus luteus bacteria, as well as water samples containing PRD1 and T4 bacteriophages. These tests indicated complex interaction between the bacteria, viruses, photocatalyst and its HDPE support. For example, they revealed that FPGs lose most of its photocatalytic efficiency in just 3 cycles. To stabilize the ZnO based FPGs and enhance its photocatalytic efficiency under the visible light irradiation, before the depositing of ZnO films we pre-covered HDPE grains by Ni underlayer. The addition of Ni resulted in mixed results – Ni underlayer reduced the efficiency of S. typhimurium disinfection during the first cycle but increased the efficiency and detoxication stability over consecutive tests using the same set of FPGs.
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Yamada, M., H. Wada, K. Sato, and M. Fukumoto. "Fabrication of TiO2 Coating by Cold Spraying and Evaluation of Its Property." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1220.

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Abstract Titanium dioxide (TiO2) is a promising material for photocatalyst coating. However, it was difficult to fabricate TiO2 coatings which have excellent photocatalyst property by thermal spray processes. Because anatase phase of TiO2 transforms into rutile phase under high temperature i.e. the photocatalyst property of TiO2 declines by heating. In this study, TiO2 photocatalyst coatings were fabricated by cold spraying. Agglomerated TiO2 powder with 100% anatase phase was injected into nitrogen or helium gas stream and deposit onto steel substrate. It was possible to fabricate TiO2 coatings with anatase phase and dense microstructure. The deposition efficiency was increased with gas temperature. The photocatalytic property of the coatings was evaluated by NOx elimination test. From the results, it became clear that cold sprayed TiO2 coatings had excellent photocatalyst property.
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Reports on the topic "Photocatalyst"

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McNulty, Thomas F. Solar Water Splitting: Photocatalyst Materials Discovery and Systems Development. Office of Scientific and Technical Information (OSTI), 2008. http://dx.doi.org/10.2172/927771.

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McQueen, Andrew, O’Niell Tedrow, Mark Ballentine, and Alan Kennedy. Demonstration of photocatalytic degradation of Per- and Polyfluoroalkyl Substances (PFAS) in landfill leachate using 3D printed TiO₂. Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/49606.

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Per- and polyfluoroalkyl substances (PFAS) are recalcitrant substances present globally in many landfill wastewater leachates and have potential ecological and human health risks. Conventional treatment technologies have shown limited efficacy for many PFAS due to the stable C–F bonds. Therefore, there is growing interest in applying advanced oxidation processes to decrease the aqueous concentrations in contaminated wastewater and mitigate risks. The goal of this study was to evaluate the photocatalytic performance of treating PFAS in landfill leachate using a novel photocatalyst composite. Treatment structures were fabricated using polylactic acid and compounded with TiO₂, and 3D printed into tiles. A pilot-scale treatment system was designed to promote photocatalysis using 3D composite structures and UV irradiance intensity of 1.0 mW cm⁻² following 24- and 36-h hydraulic retention times. Photocatalytic degradation was achieved for seven of the 11 PFAS evaluated in this study. Greater than 80% removal of PFOS, PFNA, PFDA, and PFOSAm was observed after 24 h of photocatalysis. These results indicate photocatalysis using TiO2 polymer composites can achieve beneficial levels of PFAS degradation. This study provides a proof-of principle approach to inform the application of additive manufacturing of photocatalytic composites for use in the treatment of PFAS-contaminated wastewater.
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Fowler, Simon. Design and Application of a 3D Photocatalyst Material for Water Purification. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.5532.

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Koziel, Jacek, Yael Laor, Jeffrey Zimmerman, Robert Armon, Steven Hoff, and Uzi Ravid. Simultaneous Treatment of Odorants and Pathogens Emitted from Confined Animal Feeding Operations (CAFOs) by Advanced Oxidation Technologies. United States Department of Agriculture, 2009. http://dx.doi.org/10.32747/2009.7592646.bard.

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A feasibility study was conducted, aiming to explore the potential effectiveness of UV/TiO2/O3 photooxidation technologies for simultaneous treatment of odorant and pathogen emissions from livestock and poultry operations. Several key parameters were tested in laboratory (US) and semi-pilot (Israel) scale conditions including: the effects of light energy dose (treatment time and light intensity), relative humidity and air temperature, UV wavelength, presence of photocatalyst (TiO2) and the presence of ozone. Removal and conversion of odor, target gases (sulfur-containing volatile organic compounds S-VOCs, volatile fatty acids (VFAs), phenolics, and ammonia), and airborne pathogens was tested. Up to 100% removal (below method detection level) of S-VOCs, VFAs, and phenolics, the overall odor, and up to 64.5% of ammonia was achieved with optimized treatment. Treatments involving deep UV band (185 nm) and photocatalyst (TiO2) were more efficient in removal/conversion of odorous gases and odor. The estimate of the operational cost of treatment was based on measured emissions of several odorous VOCs from full scale, commercial swine farm ranges from $0.15 to $0.59 per finisher pig. This figure represents significantly lower cost compared with the cost of biofiltration or air scrubbing.
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Peters, R. W., J. M. Wu, N. Meshkov, M. C. Thurnauer, and A. G. Ostafin. Use of cysteine-modified TiO{sub 2} photocatalyst for treatment of combined organic/inorganic wastewaters. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/28267.

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Chavadej, Sumaeth, Pramoch Rangsunvigit, and Kanokwan Saktrakool. Development of multi-stage plasma and photocatalytic system for removing air pollutants. Chulalongkorn University, 2003. https://doi.org/10.58837/chula.res.2003.79.

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A number of techniques for air pollutant removals are available such as adsorption, biofiltration and incineration. However, these techniques require further treatment and/or are energy-intensive leading to high treatment costs. Both plasma and photocatalysis are promising alternatives since these two techniques can be operated at ambient conditions resulting in low energy consumption as compared to the conventional methods. The main objective of this work was to develop a combined plasma and photocatalytic system for VOC removals. A four-stage plasma and photocatalytic reactor system was setup to study the oxidation of ethylene as a model pollutant. An increase in either applied voltage or stage number of plasma reactors enhanced C[subscript 2]H[subscript 4] conversion and CO[subscript 2] selectivity which is in contrast with the effects of frequency and feed flow rate. The commercial TiO[subscript 2] (Degussa P25), sol-gel TiO[subscript 2], and 1% Pt/sol-gel TiO[subscript 2] were used as photocatalysts. The presence of all studied photocatalysts increased the C[subscript 2]H[subscript 4] and O[subscript 2] conversions as well as CO[subscript 2] selectivity in the following order: 1% Pt/TiO[subscript 2]&gt;TiO[subscript 2]&gt;Degussa P25. The synergistic effect of photocatalysts presented in the plasma reactor is resulted from the activation of TiO[subscript 2] by the energy generated from the plasma.
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Fox, Marye A. Surface Mediated Photocatalysis. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada188882.

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Day, Nicholas. Polymeric Porphyrins as Solar Photocatalysts. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.2621.

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Shuford, Kevin. Development of Metal-Free Photocatalysts. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/1989214.

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D. Brent MacQueen. Discovery of Photocatalysts for Hydrogen Production. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/908153.

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