Solvothermal synthesis of Bi2O3/BiVO4 heterojunction with enhanced visible-light photocatalytic performances |
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Authors: | Wu Ying Wang Jing Huang Yunfang Wei Yuelin Sun Zhixian Zheng Xuanqing Zhang Chengkun |
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Affiliation: | 1. Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Huaqiao University, Xiamen 361021, China;College of Chemical Engineering, Huaqiao University, Xiamen 361021, China;2. Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Huaqiao University, Xiamen 361021, China;College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China;3. College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China |
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Abstract: | Novel, three-dimensional, flower-like Bi2O3/BiVO4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution
of NaOH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning
electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV-vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and
photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic
activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The
Bi2O3/BiVO4 exhibited much higher photocatalytic activities than pure BiVO4 and conventional TiO2 (P25). The
result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and
hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced
photocatalytic activity. |
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Keywords: | bismuth vanadate bismuth oxide heterojunction photocatalysis visible light |
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