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Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO(2(Anatase))/WO(3)/TiO(2(Rutile)) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light

[Image: see text] 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...

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Detalles Bibliográficos
Autores principales: Pinedo-Escobar, José Alfonso, Fan, Junpeng, Moctezuma, Edgar, Gomez-Solís, Christian, Carrillo Martinez, Cristina Jared, Gracia-Espino, Eduardo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8154020/
https://www.ncbi.nlm.nih.gov/pubmed/34056338
http://dx.doi.org/10.1021/acsomega.0c06054
Descripción
Sumario:[Image: see text] 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.