NDLI: Synthesis of BiVO4–TiO2–BiVO4 three-layer composite photocatalyst: effect of layered heterojunction structure on the enhancement of photocatalytic activity

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Wenjun Wang, Mingzhu Li, Hongda Gu, Shaonan Wang, Fangzhi Zhao, Yanjun Liu, Xintong Ren, Chaojun
Copyright Year	2016
Abstract	BiVO4–TiO2–BiVO4 three-layer heterostructure photocatalyst was successfully synthesized by a simple sol–gel method with a glass substrate. The structural and optical properties of the as-prepared samples were relatively characterized. UV-vis diffuse reflectance spectroscopy indicated that the BiVO4–TiO2–BiVO4 three-layer composite possessed strong visible-light absorption. Compared to pure TiO2, BiVO4 and BiVO4–TiO2 bilayer composites, the BiVO4–TiO2–BiVO4 three-layer composite photocatalyst exhibited much higher photocatalytic activity in decomposition of methylene blue and rhodamine B under visible light irradiation. The results of photoluminescence spectroscopy and photocurrent measurement indicated that three-layer structure could distinctly improve the separation and transmission of the photogenerated charges, which led to the enhanced activity. Moreover, the active species trapping experiments demonstrated holes (h+) and superoxide radicals (˙O2−) were major active species in the degradation process. Then, a possible reaction mechanism accounting for the excellent photocatalytic activity was proposed on the basis of the energy band structure of the composites.
Starting Page	75482
Ending Page	75490
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	79
Journal	RSC Advances
DOI	10.1039/c6ra16796a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy Rhodamine Oxygen Photocurrent Photocatalysis Electronic band structure Photoluminescence Reaction mechanism Superoxide Heterojunction Methylene blue
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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