Relevant bibliographies by topics / Visible light photocatalyst

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Academic literature on the topic 'Visible light photocatalyst'

Author: Grafiati
Published: 21 February 2023

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Journal articles on the topic "Visible light 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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Dhanya T.P., Dhanya T. P., and Sugunan S. Sugunan S. "Visible Light Active Titania Photocatalyst Doped with Molybdneum." International Journal of Scientific Research 2, no. 6 (2012): 51–52. http://dx.doi.org/10.15373/22778179/june2013/17.

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Wahyuni, Endang Tri, Titi Rahmaniati, Aulia Rizky Hafidzah, Suherman Suherman, and Adhitasari Suratman. "Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media." Catalysts 11, no. 8 (2021): 945. http://dx.doi.org/10.3390/catal11080945.

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The photocatalysis process over N-doped TiO2 under visible light is examined for Pb(II) removal. The doping TiO2 with N element was conducted by simple hydrothermal technique and using urea as the N source. The doped photocatalysts were characterized by DRUVS, XRD, FTIR and SEM-EDX instruments. Photocatalysis of Pb(II) through a batch experiment was performed for evaluation of the doped TiO2 activity under visible light, with applying various fractions of N-doped, photocatalyst mass, irradiation time, and solution pH. The research results attributed that N doping has been successfully performed, which shifted TiO2 absorption into visible region, allowing it to be active under visible irradiation. The photocatalytic removal of Pb(II) proceeded through photo-oxidation to form PbO2. Doping N into TiO2 noticeably enhanced the photo-catalytic oxidation of Pb(II) under visible light irradiation. The highest photocatalytic oxidation of 15 mg/L Pb(II) in 25 mL of the solution could be reached by employing TiO2 doped with 10%w of N content 15 mg, 30 min of time and at pH 8. The doped-photocatalyst that was three times repeatedly used demonstrated significant activity. The most effective process of Pb(II) photo-oxidation under beneficial condition, producing less toxic and handleable PbO2 and good repeatable photocatalyst, suggest a feasible method for Pb(II) remediation on an industrial scale.
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He, Kang, Yu Chen, and Mengjun Mei. "Study on influencing factors of photocatalytic performance of CdS/TiO2 nanocomposite concrete." Nanotechnology Reviews 9, no. 1 (2020): 1160–69. http://dx.doi.org/10.1515/ntrev-2020-0074.

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AbstractIn this study, a high-energy ball mill was used to composite nano-TiO2 and CdS, and three kinds of nanocomposite photocatalysts TiO2, CdS/TiO2-R400, and CdS/TiO2-R600 were prepared, which can respond to visible light. The photocatalytic concrete test block was prepared by mixing the nanocomposite photocatalyst and other masses with cement by incorporation method. To study the effect of the photocatalyst content on the photocatalytic performance of nanoconcrete, a total of four catalyst contents (0, 2%, 5%, and 8%) were set. The effects of high-temperature treatment (400°C) and different light sources (ultraviolet and visible light) on photocatalytic efficiency were also considered. The results show that the catalytic efficiency of CdS/TiO2-R400 under two light sources is higher than that of the other two photocatalysts. Compared to ultraviolet light sources, the photocatalytic efficiency of CdS/TiO2 nanocomposite concrete under visible light is lower, and the efficiency is below 9%. The optimal amounts of CdS/TiO2 nanocomposite photocatalyst under ultraviolet and visible light are 2% and 5%, respectively. The high-temperature treatment can improve the photocatalytic performance of CdS/TiO2 nanocomposite photocatalyst by 2% to 3%.
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Hu, Xuefeng, Ting Luo, Yuhan Lin, and Mina Yang. "Construction of Novel Z-Scheme g-C3N4/AgBr-Ag Composite for Efficient Photocatalytic Degradation of Organic Pollutants under Visible Light." Catalysts 12, no. 11 (2022): 1309. http://dx.doi.org/10.3390/catal12111309.

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As a green and sustainable technology to relieve environmental pollution issues, semiconductor photocatalysis attracted great attention. However, most single-component semiconductors suffer from high carrier recombination rate and low reaction efficiency. Here, we constructed a novel visible-light-driven Z-scheme g-C3N4/AgBr-Ag photocatalyst (noted as CN-AA-0.05) using a hydrothermal method with KBr as the bromine source. The CN-AA-0.05 photocatalyst shows an excellent photocatalytic degradation performance, and a rhodamine B (RhB) degradation ratio of 96.3% in 40 min, and 2-mercaptobenzothiazole (MBT) degradation ratio of 99.2% in 18 min are achieved. Mechanistic studies show that the remarkable performance of CN-AA-0.05 is not only attributed to the enhanced light absorption caused by the Ag SPR effect, but also the efficient charge transfer and separation with Ag nanoparticles as the bridge. Our work provides a reference for the design and construction of efficient visible-light-responsive Z-scheme photocatalysts, and an in-depth understanding into the mechanism of Z-scheme photocatalysts.
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Wang, Jiaquan, and Chunyin Zhu. "Visible-light photocatalyst design." Chem Catalysis 2, no. 10 (2022): 2414–16. http://dx.doi.org/10.1016/j.checat.2022.09.032.

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Hussin, Faisal, Hendrik Oktendy Lintang, Siew Ling Lee, and Leny Yuliati. "Highly efficient zinc oxide-carbon nitride composite photocatalysts for degradation of phenol under UV and visible light irradiation." Malaysian Journal of Fundamental and Applied Sciences 14, no. 1-2 (2018): 159–63. http://dx.doi.org/10.11113/mjfas.v14n1-2.974.

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In order to utilize solar light in an efficient way, a good photocatalyst shall absorb both UV and visible light. In this study, a series of composite photocatalyst consisting of zinc oxide (ZnO) and carbon nitride (CN) was successfully prepared through a physical mixing method. The ZnO is an ultraviolet (UV)-based photocatalyst, while the CN is known as a visible light-driven photocatalyst. The effect of zinc to carbon mol ratio (Zn/C) towards the properties and photocatalytic activities was investigated. X-ray diffraction (XRD) patterns revealed that the prepared ZnO-CN composite photocatalysts composed of wurtzite ZnO and graphitic CN. The presence of ZnO and CN made the composites have absorption at both UV and visible region, suggesting the potential application as photocatalysts under both UV and visible light. Fluorescence studies revealed that all ZnO-CN composites showed emission peaks at 445 and 460 nm when excited at 273 nm, but with lower intensity as compared to those of the CN. The lower emission intensity suggested the role of ZnO to reduce the charge recombination and improve the charge separation on the CN. The ZnO-CN composites were further evaluated for photocatalytic degradation of phenol. The amount of degraded phenol was determined by a gas chromatography, in which a flame ionization detector was used in this study (GC-FID). The composite photocatalyst with an optimum content of 1% Zn/C gave almost 1.15 times higher activity than the CN under visible light irradiation. On the other hand, the composite photocatalyst with an optimum content of 50% Zn/C showed 2.6 times higher activity than the CN under UV light. The improved photocatalytic efficiency on the ZnO-CN composite photocatalysts was caused by the synergic effect between ZnO and CN. The ZnO would boost the separation efficiency of photogenerated electrons on the CN, while the CN would enable ZnO to absorb visible light region as the ZnO-CN composites.
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Yang, Ying Chun, Xin Zhi Wang, and Jing Qu. "Preparation and Photocatalytic Degradation of Malachite Green by Photocatalyst SrBi4O7 under Visible Light Irradiation." Applied Mechanics and Materials 522-524 (February 2014): 411–15. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.411.

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Visible-light responsive SrBi4O7 photocatalyst was prepared by a traditional copreparation method. The photocatalyst was characterized by XRD and UV-Vis diffuse reflectance spectra. The as-prepared photocatalysts were used for the photocatalytic degradation of malachite green (MG) under visible light irradiation. Preparation conditions of catalysts, concentration of malachite green, photocatalyst dosage, irradiation time and photocatalytic reaction kinetics have been investigated. Under the optimized reaction conditions, decolourization ratio and COD removal rates of MG were 99.62% and 95.6%, respectively. The results indicate that SrBi4O7 has good photocatalytic activities for the decomposition of MG. And it has the potential higher visible light photocatalytic activity with a band gap of 2.44 eV.
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LEI, YONGQIAN, GUANHUA WANG, PENGRAN GUO, and HUACAN SONG. "SILVER PHOSPHATE BASED PLASMONIC PHOTOCATALYST: HIGHLY ACTIVE VISIBLE-LIGHT-ENHANCED PHOTOCATALYTIC PROPERTY AND PHOTOSENSITIZED DEGRADATION OF POLLUTANTS." Functional Materials Letters 05, no. 04 (2012): 1250047. http://dx.doi.org/10.1142/s1793604712500476.

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A stable silver phosphate based plasmonic photocatalyst ( Ag-Ag3PO4 ) was successfully fabricated, which can drive catalytic reaction under low-intensity visible light. The synthesized plasmonic photocatalyst shows high performance and stability on the photodegradation of RhB under visible-light irradiation, and represents obviously enhanced photocatalytic activity than the pure Ag3PO4 sample. The photosensitization process was carried out in the photodegradation of 2,4-DCP and RhB mixture, of which the photocatalyst shows the enhancement activity for 2,4-DCP while weaker for RhB . The investigation is likely to open up a new sight for the preparation of high efficient and stable plasmonic photocatalysts which utilizes visible light.
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Trang, Ton Nu Quynh, Le Thi Ngoc Tu, Tran Van Man, and Vu Thi Hanh Thu. "Photocatalytic activity enhancement for removal of dye molecules based on plasmonic Ag grafted TiO2 nanocubes under visible light driven." Science and Technology Development Journal 23, no. 4 (2020): 743–51. http://dx.doi.org/10.32508/stdj.v23i4.2455.

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Introduction: Finding a novel photocatalyst for photocatalytic degradation operating in the wavelength range from UV to visible light has been considered a great potential for environmental remediation. Herein, TiO2 nanocubics (NCs) decorated Ag nanoparticles (NPs) with various concentrations were developed.
 Methods: The crystal structure, morphological and chemical characteristics of prepared photocatalysts were thoroughly analyzed by a series of main analyses (X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and UVVis spectra).
 Results: The results revealed that a significantly promoting visible-light photocatalytic behavior of TiO2NCs@Ag photocatalyst was observed. The photocatalytic methyl orange (MO) degradation of the as-synthesized Ag anchored TiO2NCs photocatalyst (85% and 62% under UV light and visible light, respectively) exhibited outstanding photocatalytic efficacy compared with pristine TiO2 NCs. The achieved results could be assigned to the synergistic effects between TiO2NCs and Ag- NPs, leading to enhanced charge carrier separation and improved absorption ability in visible-light response.
 Conclusion: This work facilitates designing and developing high-efficiency heterostructure photocatalysts for practical works related to environmental deterioration.
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Dissertations / Theses on the topic "Visible light photocatalyst"

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Chen, Xi. "Noble metal photocatalysts under visible light and UV light irradiation." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47008/1/Xi_Chen_Thesis.pdf.

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One of the greatest challenges for the study of photocatalysts is to devise new catalysts that possess high activity under visible light illumination. This would allow the use of an abundant and green energy source, sunlight, to drive chemical reactions. Gold nanoparticles strongly absorb both visible light and UV light. It is therefore possible to drive chemical reactions utilising a significant fraction of full sunlight spectrum. Here we prepared gold nanoparticles supported on various oxide powders, and reported a new finding that gold nanoparticles on oxide supports exhibit significant activity for the oxidation of formaldehyde and methanol in the air at ambient temperature, when illuminated with visible light. We suggested that visible light can greatly enhance local electromagnetic fields and heat gold nanoparticles due to surface plasmon resonance effect which provides activation energy for the oxidation of organic molecules. Moreover, the nature of the oxide support has an important influence on the activity of the gold nanoparticles. The finding reveals the possibility to drive chemical reactions with sunlight on gold nanoparticles at ambient temperature, highlighting a new direction for research on visible light photocatalysts. Gold nanoparticles supported on oxides also exhibit significant dye oxidation activity under visible light irradiation in aqueous solution at ambient temperature. Turnover frequencies of the supported gold nanoparticles for the dye degradation are much higher than titania based photocatalysts under both visible and UV light. These gold photocatalysts can also catalyse phenol degradation as well as selective oxidation of benzyl alcohol under UV light. The reaction mechanism for these photocatalytic oxidations was studied. Gold nanoparticles exhibit photocatalytic activity due to visible light heating gold electrons in 6sp band, while the UV absorption results in electron holes in gold 5d band to oxidise organic molecules. Silver nanoparticles also exhibit considerable visible light and UV light absorption due to surface plasmon resonance effect and the interband transition of 4d electrons to the 5sp band, respectively. Therefore, silver nanoparticles are potentially photocatalysts that utilise the solar spectrum effectively. Here we reported that silver nanoparticles at room temperature can be used to drive chemical reactions when illuminated with light throughout the solar spectrum. The significant activities for dye degradation by silver nanoparticles on oxide supports are even better than those by semiconductor photocatalysts. Moreover, silver photocatalysts also can degrade phenol and drive the oxidation of benzyl alcohol to benzaldehyde under UV light. We suggested that surface plasmon resonance effect and interband transition of silver nanoparticles can activate organic molecule oxidations under light illumination.
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Su, Yang. "Copper oxide nano photocatalyst for wastewater purification using visible light." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277730.

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This thesis presents the synthesis and characterization of copper oxide nano photocatalyst for wastewater purification using visible light. The presented copper oxide nano material can serve as a low-cost and green technology for environmental applications. Uniform cubic, octahedral and rhombic dodecahedral Cu2O nano crystals with a size of 300-600 nm were synthesized using a simple hydrothermal method. The rhombic dodecahedral Cu2O nano crystals are highly active when driven by low-power white LEDs as a light source. In comparison with other reported photocatalysts, the Cu2O nano crystals in this work show a much higher reaction rate and lower electrical energy per order. The reaction rate and photoefficiency are found to be highly correlated with the irradiated photon flux. The surface termination and facet orientation of Cu2O nano particles were accurately tuned by adjusting the amount of hydroxylamine hydrochloride and surfactant. It is found that Cu2O nano particles with Cu-terminated (110) or (111) surfaces show high photocatalytic activity, while other exposed facets show poor reactivity. The density functional theory simulations confirm that the sodium dodecyl sulfate surfactant can lower the surface free energy of Cu-terminated surfaces, increasing the density of exposed Cu atoms at the surfaces, and thus benefiting the photocatalytic activity. It also shows that the poor reactivity of Cu-terminated Cu2O (100) surface is due to the high energy barrier of holes at the surface region. Amorphous CuxO nano flakes with a thickness of 10 to 50 nm were prepared through the dye-assisted transformation of rhombic dodecahedral Cu2O nano crystals under facile hydrothermal condition. The amorphous CuxO nano flake consists of a combination of Cu(I) and Cu(II) with a ratio close to 1:1. It shows enhanced photocatalytic reactivity towards the degradation of methyl orange compared to rhombic dodecahedral Cu2O nano crystals with all active (110):Cu facets. The chemical composition and architecture remain the same after repeating degradation tests. The high surface-to-volume ratio contributes to its better photocatalytic performance while its low surface energy calculated by the density functional theory simulations explains its improved stability. The as-obtained photocatalysts are able to degrade a wide range of aromatic organics including toluene, chlorobenzene and nitrobenzene effectively. We also demonstrate the capability of decontaminating a wide range of aromatic organics in industrial wastewater that comes from an oil company.
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De, La Fuente Garcia Elena Luisa. "Visible Light Photocatalyst for Water Purification and Self-Cleaning Coatings." Doctoral thesis, Università degli studi di Bergamo, 2018. http://hdl.handle.net/10446/108456.

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Pollution in water and atmosphere is a growing concern in the current society and demands short-term solutions. Conventional purification techniques like biological treatment, direct oxidation, etc. cannot eliminate low concentrations or some of the so-called emerging pollutants (hormones, detergents, pharmaceuticals, etc.) thus calling for the use of advanced oxidation processes (AOP), namely, techniques in which highly oxidising agents (mostly OH radicals) are produced to degrade organics compound, bacteria and viruses, reaching the complete mineralization or, at least, producing nontoxic by-products. One of these techniques is heterogeneous photocatalysis: redox reactions are developed on the surface of a solid catalyst that is activated by light. Nowadays the more employed and studied photocatalyst is titanium dioxide (TiO2). Its commercial applications are very diverse, including self-cleaning materials (cements, paints), antifogging materials (mirrors, glasses) and water and air purification devices. The operating limits of this effective photocatalyst are in the fact that it needs UV radiation to be activated, due to its relatively wide band gap (3.2 eV). This is a significant problem in economic terms, for high energy costs, in healthy terms, since UV radiation is dangerous for sight and skin, and it is a limit to the use of sunlight, as only 4 % of the solar spectrum that reaches the Earth surface is in the UV range. To overcome this problem, investigations are focused on TiO2 modifications to render it active with visible light (doping with metal and non-metal ions, coupling with other semiconductors, etc) as well as on the use of other semiconductors with narrower band gap. A ceramic material, lanthanum orthoferrite (LaFeO3), with ionic and electronic semiconductor properties, is synthesized in our laboratory since 2008 and it is studied for its application in the combustion cells. Knowing that it also works as photoconductor under visible light [3], it can be considered a good candidate to be used as visible light photocatalyst. Its effectiveness in the degradation of organic dyes and other molecules has been reported. After the successful degradation of organic compounds in the slurry tests carried up with the LaFeO3 powders, our group started to develop deposition systems in order to avoid filtration problems, such as loss of catalyst and costs, thus rendering the reuse of the photocatalyst easier to achieve a practical applicability. In the present thesis two deposition methods were studied: the preparation of a photocatalytic paint and the deposition of the catalyst over a ceramic foam by dip-coating process. In the first part of the work, LaFeO3 was added to a commercial water based paint. This innovative photocatalytic paint has been tested to prove two aspects: • Its self-cleaning performances, following the degradation of an azo dye under visible light irradiation. • The paint durability, executing accelerated ageing tests in a climatic chamber, and subsequently verifying visible alterations and possible diminution of its self-cleaning performances. In the second part, the objective was the application of the material for the wastewater treatment. In collaboration with the Universidad de Las Palmas de Gran Canaria a handy and resistant photocatalytic foam was developed, to avoid the vigorous continuous stirring required to keep powder in slurry and the necessary filtration after the reactions to reuse the photocatalyst. The support chosen was a commercial ceramic inert porous material (foam) and the deposition method was the dip-coating technique. To apply this coating technique high quantities of catalyst had to be used because it required the preparation of a very concentrate solution. For this reason and for a possible scaling up, the production rate of the photocatalyst in our laboratory had to be increased. The quality of the catalyst had been largely tested for low production rates. Theoretically the results of the synthesis must be the same; however, a complete characterization and determination of photocatalytic performances were carried out on three batches of catalyst prepared on a large scale. The photocatalytic foam and the different batches in slurry were tested in the degradation of 4-Nitrophenol. A comparison between the slurry test and the fixed bed test is presented.
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Wang, Fan. "Visible light photocatalysis with supported metal nanoparticles for organic synthesis." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103567/1/Fan_Wang_Thesis.pdf.

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This project was a step forward in developing new effective photocatalysts for fine organic synthesis under visible light irradiation. These kind of new photocatalysts are able to facilitate reaction rates by using visible light under moderate reaction conditions through a green, economical and environmentally friendly pathway. This thesis investigated the catalyst synthesis, characterization and the application in organic reactions with high activity and selectivity. The discovery of these new metal nanoparticle photocatalysts may inspire further studies on other efficient photocatalysts and enhance the potential to utilize sunlight via a controlled and environmentally friendly process.
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Liu, Zhe. "Visible light driven fine organic synthesis using plasmonic materials as photocatalyst." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/206452/1/Zhe_Liu_Thesis.pdf.

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This research focuses on plasmonic materials as photocatalyst in fine organic synthesis under visible light irradiation. It was illustrated that noble metal (silver) nanoparticles performed well as photocatalyst in toluene oxidation reaction, which was not only achieved in mind reaction condition, but also controlled with high selectivity of product. In addition, titanium nitride (TiN) material and transition metal (Pd) nanoparticles both can be applied in the cleavage of lignin models with two different reaction pathway and product selectivity. Finally, the analysis of all the reaction mechanism is significant for the further study of related organic synthesis.
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Ramírez, Nieves P. "Visible light-promoted transformations of carboxylic acids using organic photocatalysts." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/110279.

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In this doctoral thesis, we have studied the oxidation of carboxylic acids to obtain the corresponding acyloxy radicals, using visible light and non-toxic and inexpensive organic dyes, as photocatalysts. On the one hand, we study the photooxidation of aromatic carboxylic acids to obtain acyloxy radicals, whose decarboxylation is relatively slow (Chapter I and Chapter II). On the other hand, we describe the photooxidation of aliphatic carboxylic acids, to take advantage of the rapid decarboxylation of the corresponding acyloxy radicals, to generate nucleophilic radicals that were trapped by different reagents (Chapter III to Chapter V). It should be noted that all the protocols are free of expensive and toxic noble metals, the reactions were promoted with visible light at room temperature and the scalability of some reactions was demonstrated in batch conditions or using flow chemistry. In addition, mechanistic studies were carried out to propose plausible photocatalytic routes to all the reactions studied.
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Liu, Zhe. "New supported metal photocatalysts for synthesis of fine organic chemicals driven by visible light." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95889/1/Zhe%20Liu%20Thesis.pdf.

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This project is to develop a series of new photocatalyst for fine organic synthesis in irradiation of visible light under mild conditions. To achieve this goal, the detailed study of photocatalytic properties of plasmonic metal nanoparticles supported on zirconium dioxide was carried out, including the catalyst synthesis, characterization and application in redox reactions with high activity. The discovery of these new plasmonic metal nanoparticle photocatalyst may inspire further studies on other efficient photocatalysts and enhance the potential to utilize sunlight via a controlled and environmentally friendly process.
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Chen, Chao. "Visible light photocatalysts for synthesis of fine organic chemicals on supported nanostructures." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/66437/1/Chao_Chen_Thesis.pdf.

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This thesis is focus on developing new photocatalysts for synthesis of fine organic chemicals on supported nanostructures. These photocatalysts can facilitate reactions by using visible light, moderate temperature and atmospheric pressure which is suitable for a sustainable, green and eco-friendly modern chemical industry. Both Semiconductor Photocatalyst and Noble Metal Photocatalysts are designed to facilitate the homocouplings reaction of imine generation by amines.
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Li, Haitao. "Synthesis of Titanium Dioxide Photocatalyst with the Aid of Supercritical Fluids." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4912.

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Titanium Dioxide (TiO2) emerged as one of the most popular photocatalysts since 1970's. However, its photocatalytic activity requires UV irradiation due to its large band gap unless further functionalization or modifications are performed. Furthermore, recovery issue has always been a major drawback, if the more effective form nano particles are utilized. The key objectives of this research were synthesizing new TiO2 based photocatalyst systems that are effective with both the UV and the visible light while utilizing novel superior environmentally friendly techniques enabling development of nano-structured photocatalysts that can be easily recovered. In this dissertation research, highly porous nano-structured TiO2/WO3/Fe3+ aerogel composite photocatalyst are prepared, characterized, and tested for model photocatalytic reactions. The photocatalyst structure is tailored to capture environmental pollutants and enable their decomposition in-situ under both UV and visible light through photodecomposition to smaller benign substances. A novel and green method is applied to prepare unique surfactant templated aerogel photocatalysts with highly porous nano-structure, high surface area, and tailored pore size distribution. Sol-gel process followed by supercritical fluids extraction and drying allowed synthesis of highly porous composite TiO2/WO3 aerogel. The surfactant template was completely removed with the aid of a supercritical solvent mixture followed with heat treatment. Fe3+ ion was incorporated within the composite aerogel photocatalyst as dopant either at the sol-gel co-precipitation step or at a subsequent supercritical impregnation process. Supercritical drying followed with heat treatment results in titanium dioxide with the most profound anatase crystal structure. Neutral templates were used to further enhance retention and tuning of the nano-pore structure and the surface properties. The Nitrogen adsorption-desorption isotherms methods were used to follow the removal of solvents and templates as well as tracking the textural properties of the synthesized aerogel. Surfactant-templated aerogels, which show remarkable thermal stability and uniform pore size distribution, exhibit specific surface areas three times more than the highly optimized commercial nano-particles, industry standard TiO2 photocatalyst Degussa P-25, even after heat treatment. The synthesized catalysts were characterized by using SEM, FIB, EDS, XRD, XPS and porosimetry prior to post photocatalytic activity evaluation through a model photocatalytic reaction. The band gaps of the catalysts were also determined by using diffuse reflectance spectroscopy. The model reaction employed Methylene Blue (MB) photo-oxidation under UV and visible light. Resulting aerogel TiO2/WO3/Fe3+ photocatalyst exhibited comparable photocatalytic capability to Degussa P25 under UV light exposure and offered much superior photocatalytic capability under visible light exposure.
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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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Books on the topic "Visible light photocatalyst"

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Ghosh, Srabanti. Visible Light-Active Photocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527808175.

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Stephenson, Corey, Tehshik Yoon, and David W. C. MacMillan. Visible Light Photocatalysis in Organic Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527674145.

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Khan, Mohammad Mansoob, Debabrata Pradhan, and Youngku Sohn, eds. Nanocomposites for Visible Light-induced Photocatalysis. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62446-4.

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Martin, David James. Investigation into High Efficiency Visible Light Photocatalysts for Water Reduction and Oxidation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18488-3.

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Nayak, Arpan Kumar, and Niroj Kumar Sahu. Nanostructured Materials for Visible-Light-Photocatalysis. Elsevier, 2021.

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Pradhan, Debabrata, Mohammad Mansoob Khan, and Youngku Sohn. Nanocomposites for Visible Light-induced Photocatalysis. Springer, 2018.

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Stephenson, Corey R. J., Tehshik P. Yoon, and David W. C. MacMillan. Visible Light Photocatalysis in Organic Chemistry. Wiley & Sons, Incorporated, John, 2018.

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Stephenson, Corey R. J., Tehshik P. Yoon, and David W. C. MacMillan. Visible Light Photocatalysis in Organic Chemistry. Wiley & Sons, Limited, John, 2018.

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Pradhan, Debabrata, Mohammad Mansoob Khan, and Youngku Sohn. Nanocomposites for Visible Light-induced Photocatalysis. Springer, 2017.

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Stephenson, Corey R. J., Tehshik P. Yoon, and David W. C. MacMillan. Visible Light Photocatalysis in Organic Chemistry. Wiley & Sons, Incorporated, John, 2018.

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Book chapters on the topic "Visible light photocatalyst"

1

Ullattil, Sanjay Gopal, Soumya B. Narendranath, and Pradeepan Periyat. "Black TiO2 : The New-Generation Photocatalyst." In Visible Light-Active Photocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527808175.ch5.

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Ohno, Teruhisa. "Development of Visible Light Responsive Morphology Controlled TiO2 Photocatalyst." In Nanostructured Photocatalysts. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_4.

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Wang, Zheng, Jiangting Wang, Lianyun Liu, Kai Huang, Jungang Hou, and Hongmin Zhu. "Tatalum Nitride for Efficient Visible-Light-Driven Photocatalyst." In Supplemental Proceedings. John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch4.

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Sirajudheen, P., K. B. Sanoop, and Muhammed Rashid. "Visible Light Induced ZnTiO3 Photocatalyst Synthesized by Co-Precipitation Process." In Recent Advances in Chemical Engineering. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1633-2_25.

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E, Lei, Ming Xia Xu, Lei Ge, Yu Ming Tian, Yan Li, and Tiantian Xu. "Preparation and Properties of Titanium Oxide Photocatalyst with Visible Light Activity." In High-Performance Ceramics III. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.377.

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Zargazi, Mahboobeh, and Mohammad Chahkandi. "Bismuth-Based Compounds as Visible Light Photocatalyst for Remediation and Water Splitting." In Water Pollution and Remediation: Photocatalysis. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54723-3_10.

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Sharma, Nikita, Zsolt Pap, Seema Garg, and Klara Hernadi. "Photocatalyst Composites from Bi-based and Carbon Materials for Visible Light Photodegradation." In Green Chemistry and Sustainable Technology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77371-7_6.

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Somekawa, Shouichi, Yoshihumi Kusumoto, Yuji Horie, Katsuichi Miyamae, and Takaomi Kamiwaki. "A Novel Type of Solar Cell Based on Visible-Light Responsive Photocatalyst Films." In Proceedings of ISES World Congress 2007 (Vol. I – Vol. V). Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_269.

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Li, Likun, Junfu Chen, Jiann-Yang Hwang, JiXiong Liu, Yong Zhou, and Lijun Lu. "Photocatalytic H2Production Under Visible Light Irradiation on Novel Heterostructure NiS/ZnS Nanosheet Photocatalyst." In Characterization of Minerals, Metals, and Materials 2015. John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093404.ch98.

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Affam, Augustine Chioma, Wong Chee Chung, Poh Lin Lau, et al. "Design Expert Application for Optimization of Ag/AgBr/TiO2 Visible Light Photocatalyst Preparation." In Lecture Notes in Civil Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6311-3_11.

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Conference papers on the topic "Visible light 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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KUSUMAWARDANI, CAHYORINI, INDRIANA KARTINI, and NARSITO. "SYNTHESIS OF VISIBLE LIGHT ACTIVE N-DOPED TITANIA PHOTOCATALYST." In Proceedings of the International Conference on CBEE 2009. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814295048_0023.

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Pincella, Francesca, Katsuhiro Isozaki, and Kazushi Miki. "Visible Light Photocatalyst Based on Plasmon-enhanced Two-photon Absorption." In JSAP-OSA Joint Symposia. OSA, 2013. http://dx.doi.org/10.1364/jsap.2013.17p_d4_3.

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Wang, Chih-Ming. "Plasmonic CuxO photocatalyst for Solar Water Splitting with Visible Light." In JSAP-OSA Joint Symposia. OSA, 2013. http://dx.doi.org/10.1364/jsap.2013.17p_d4_2.

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Tuan, Vu Anh, Bui Thi Hai Linh, Hoang Yen, et al. "Visible-light-driven TiO 2 photocatalyst synthesis and photocatalytic properties." In Smart Materials, Nano-and Micro-Smart Systems, edited by Jung-Chih Chiao, Alex J. Hariz, David V. Thiel, and Changyi Yang. SPIE, 2008. http://dx.doi.org/10.1117/12.810712.

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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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Wang, Gou-Jen, Wei-Zheng Chen, and Ming-Way Lee. "A Novel Chloroplastmimic Photovoltaics With Full Visible Spectrum Operation." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34322.

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A novel and very simple chloroplastmimic photovoltaic scheme, in which water is photolyzed by a new photocatalyst fabricated by depositing a thin film of TiO2 on an array of carbon nanotubes (CNT), has been made. Multiple reflections within the photocatalyst extend the optical response from the ultraviolet range to the full visible range. Hydrogen ions with various concentrations are separated by an artificial thylakoid membrane, resulting in a transmembrane chemiosmotic potential, generating ion-diffusion-induced electricity. Experimental results demonstrate that the proposed simple chloroplastmimic photovoltaics can produce a photocurrent directly from visible light.
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"Synthesis and Characterization of SnO2 Nano Photocatalyst with High Visible Light Activity." In Oct. 5-6, 2017 Paris - France. EIRAI, 2017. http://dx.doi.org/10.17758/eirai.f1017215.

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Qinglin Yang, Ying Sun, Junxin Su, Lin Guo, and Lei Jiang. "Preparation of visible-light active N-doped nano-TiO2 photocatalyst by hydrothermal method." In Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930604.

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Sahu, Rajesh, S. K. Jain, and Balram Tripathi. "Comparative Study of Visible Light Induced MWCNTs Dispersed CdS and ZnS based Photocatalyst." In 2022 International Conference for Advancement in Technology (ICONAT). IEEE, 2022. http://dx.doi.org/10.1109/iconat53423.2022.9726085.

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Reports on the topic "Visible light photocatalyst"

1

Chuang, Steven S. C. CO2 SEQUESTRATION AND RECYCLE BY PHOTOCATALYSIS WITH VISIBLE LIGHT. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/799755.

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Chuang, Steven S. C. CO2 SEQUESTRATION AND RECYCLE BY PHOTOCATALYSIS WITH VISIBLE LIGHT. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/802825.

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