Preparation and visible light photocatalytic activity of Bi2O3/Bi2WO6 heterojunction photocatalysts

3rd International Conference on Energy Equipment Science and Engineering

Yan, C.Y.^1 ; Yi, W.T.^1 ; Xiong, J.^1 ; Ma, J.^1

College of Chemistry, Chemical Engineering and Material Science, Zaozhuang University, Zaozhuang, China^1

关键词: Photocatalytic activities;    Photocatalytic reactions;    Photoexcited electrons;    Powder X ray diffraction;    Two-step hydrothermal method;    UV-Vis diffuse reflectance spectroscopy;    Visible light photocatalytic activity;    Visible-light irradiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012086/pdf
DOI  :  10.1088/1755-1315/128/1/012086

来源: IOP

【 摘 要 】

The Bi2O3nanorods, flower-like Bi2WO6and Bi2O3/Bi2WO6heterojunction composites with the molar ratio of nBi:nWfrom 2:1, 2.5:1, to 3:1 have been synthesized via one-step hydrothermal method and two-step hydrothermal method, respectively. The products are characterized by powder X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and scanning electron microscopy (SEM). Photocatalytic experiments indicate that such Bi2O3/Bi2WO6composite possesses higher photocatalytic activity for RhB degradation under visible-light irradiation in comparison with pure Bi2O3and Bi2WO6. The enhancement of the photocatalytic activity of the Bi2O3/Bi2WO6heterojunction catalysts can be ascribed to the reduced recombination of the photoexcited electrons and holes during the photocatalytic reaction. The effect of the molar ratio of nBi:nWon the catalytic performance of the heterojunction catalysts was also investigated. And the optimal molar ratio of nBi:nWis 2.5:1 which was synthesized by one-step hydrothermal method.