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.

ABSTRACT: Nanoparticulate double-heterojunction photocatalysts comprising TiO_2(Anatase)/WO₃/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 % WO₃-TiO₂) 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)/WO₃/TiO_2(Rutile) system leads to enhanced photoactivity when compared to individual oxides and commercial TiO₂ P25.

SUBMITTER: Pinedo-Escobar JA 

PROVIDER: S-EPMC8154020 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature