Production of heterostructured TiO2/WO3 Nanoparticulated photocatalysts through a simple one pot method

Castro, Isabela Alves de; Oliveira, Jéssica A.; Paris, E. C.; Giraldi, Tania R.; Ribeiro, Cauê

doi:10.1016/j.ceramint.2014.11.001

Cited by 23 publications

(14 citation statements)

References 32 publications

(14 reference statements)

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“…The latter is possible due to the small standard reduction potential (−0.03 eV) between W(VI) and W(V). 39 Subsequently, WO 3 can transfer electrons to adsorbed oxygen molecules on TiO 2 , resulting in enhanced photocatalytic degradation of organic molecules. 13 …”

Section: Introductionmentioning

confidence: 99%

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

et al. 2021

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Nanoparticulate double-heterojunction photocatalysts comprising TiO 2(Anatase) /WO 3 /TiO 2(Rutile) were produced by a sol–gel method. The resulting photocatalysts exhibit clear synergistic effects when tested toward the degradation of methyl orange under both UV and visible light. Kinetic studies indicate that the degradation rate on the best double-heterojunction photocatalyst (10 wt % WO 3 -TiO 2 ) depends mainly on the amount of dye concentration, contrary to pure oxides in which the degradation rate is limited by diffusion-controlled processes. The synergistic effects were confirmed through systematic and careful studies including holes and OH radical formation, X-ray diffraction, electron microscopy, elemental analysis, UV–vis diffuse reflectance spectroscopy, and surface area analysis. Our results indicate that the successful formation of a double heterojunction in the TiO 2(Anatase) /WO 3 /TiO 2(Rutile) system leads to enhanced photoactivity when compared to individual oxides and commercial TiO 2 P25.

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Section: Introductionmentioning

confidence: 99%

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

et al. 2021

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“…However, its photocatalytic activity remains insufficient for practical applications because of the high recombination rate of photogenerated electronhole pairs (e --h + ) [2][3]. Thus, TiO2 is coupled with other metal oxides, such as ZrO2, CeO2, NiO, WO3 and Al2O3 in order to improve the photocatalytic activity [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Guerrero-Araque

Ramírez-Ortega

Acevedo–Peña

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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2 Graphical abstract Highlights: ZrO2-TiO2 heterojunction with high photocatalytic activity were obtained by solgel. Energy states at heterojunction interface altered the semiconducting properties. 5 mol% ZrO2 in ZrO2-TiO2 heterojunction propitiated a better electron-hole separation. Photocatalytic activity is improved by favoring the charge transfer process. Direct and indirect charge transfer process involved in phototocatalytic process. Abstract.In this paper, ZrO2-TiO2 composites were synthesized by sol-gel method with different ZrO2:TiO2 molar ratios (01:99, 05:95 and 10:90). The results identified two trends; at a low ZrO2 content, the incorporation of Zr 4+ into the TiO2 lattice was possible provoking generation of oxygen vacancies (1 mol % of ZrO2); while at higher ZrO2 contents, ZrO2-TiO2 heterojunctions were created (5 and 10 mol % of ZrO2). The photocatalytic activity was evaluated by measuring photodegradation of phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid or 4-chlorophenol solutions. The ZT-5 composite shows the best performance attributed to surface states at the interface of ZrO2-TiO2 heterojunctions.These surface states act as traps for charge carriers favoring the spatial separation of electron-hole pairs until reaching a maximum in the composite with 5 mol% of ZrO2. The ZT-5 composite showed the most negative flat band potential and the highest donor density indicating that these surface states are in optimal concentration. At higher ZrO2 contents, charge carrier separation is less effective, which decreases the photocatalytic activity.Nevertheless, the molecule structure has an impact on the direct or indirect charge transfer process as was evidenced by EIS measurements.

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“…O crescimento simultâneo permite que a heteroestrutura seja obtida em apenas uma etapa de síntese, sendo essa a principal vantagem, especialmente quando se considera a viabilidade da rota sintética para plantas industriais. [29][30][31][32] Entretanto, esse processo além de requerer que as fases sejam formadas em condições similares, pode levar à formação de fases segregadas, dopagem indesejada, além do baixo controle morfológico.…”

Section: Obtenção De Heteroestruturas Por Crescimento Simultâneo Das unclassified

“…Esse método se baseia na formação de uma rede de polímeros tridimensionais que mantem os cátions dispersos de forma homogênea em toda a sua estrutura, impedindo a precipitação de óxido/hidróxido e a separação de fases na etapa de calcinação. 24 Castro e colaboradores, 29 por exemplo, sintetizaram heteroestruturas de TiO 2 /WO 3 com propriedades físico--químicas superiores àquelas apresentadas pelas fases individuais ou pela mistura física.…”

Section: Obtenção De Heteroestruturas Por Crescimento Simultâneo Das unclassified

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Bueno¹,

Lopes²,

Carvalho³

et al. 2019

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The study of the heterostructures aim the development of physico-chemical and photocatalytic properties higher than their isolated phases, which makes it possible to obtain higher efficiency and lower cost in several technological processes. Recently the heterostructured materials have been extensively used in the development of alternative technologies either for environmental pollution control or for renewable energy production, among other applications. However, the obtaining of a heterostructure with suitable features is not trivial. In this way, this review article presents a broad discussion about methods of obtaining heterostructures formed by semiconductors and their applications in the photochemical processes, mainly in the environmental field. It will be addressed the use of the heterostructures in photocatalytic application for the organic pollutants degradation, heavy metals removal, the inactivation of pathogenic microorganisms, beyond of the volatile organic compounds (VOC's) photooxidation and the photocatalytic abatement of nitrogen oxide (NO x) in gaseous phase. Finally, a discussion about the carbon dioxide (CO 2) photoreduction and hydrogen (H 2) production focusing mainly in the chemical energy production will be presented.

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Production of heterostructured TiO2/WO3 Nanoparticulated photocatalysts through a simple one pot method

Cited by 23 publications

References 32 publications

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

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Production of heterostructured TiO2/WO3 Nanoparticulated photocatalysts through a simple one pot method

Cited by 23 publications

References 32 publications

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO2(Anatase)/WO3/TiO2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO2(Anatase)/WO3/TiO2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

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Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO_2(Anatase)/WO₃/TiO_2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light