Photocatalytic reduction of U(Ⅵ) in aqueous solution by CuO/BiFeO3 heterojunction under visible light irradiation

被引：0
|
作者：
Li X.-Y. [1 ]
Chen C. [2 ]
Liu Y.-B. [1 ]
Liu C. [1 ]
Li X. [1 ]
Guan F.-F. [1 ]
Xiao H. [1 ]
机构：
[1] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang
[2] China Institute for Radiation Protection, Taiyuan
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2020年 / 30卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Bismuth ferrite; Copper oxide; Heterojunction; Photocatalytic; Reduction; Uranium;
D O I：
10.11817/j.ysxb.1004.0609.2020-35805
中图分类号：
学科分类号：
摘要：
CuO/BiFeO3 heterojunction catalysts were prepared by wetness impregnation method and the structures, morphologies and optical properties of the samples were characterized by SEM, XRD, XPS and UV-Vis. The photocatalytic reduction of U(Ⅵ) in aqueous solution by CuO/BiFeO3 heterojunction catalyst was investigated under visible light irradiation at room temperature and analyzed the mechanism of photocatalytic reduction of U(Ⅵ). The results show that the CuO particles are spherical and smooth in surface, they are monoclinic. BiFeO3 particles are irregular and agglomerated into layers, which are perovskite structure. CuO/BiFeO3 containing 10% CuO exhibited the lowest photoluminescence intensity and the maximum photocatalytic reduction of U(Ⅵ) than pure CuO and BiFeO3 and the removal rate of U(Ⅵ) reached above 96% after 100 min under visible-light irradiation. The improvement of photocatalytic activity of the catalyst is mainly due to the p-n heterostructure formed on the interface of CuO and BiFeO3, which effectively inhibits the recombination of photogene rated electronics and holes, enhances the transfer efficiency of interfacial charge, and improves the photocatalytic efficiency. The removal rate of U(Ⅵ) is above 80% after four cycles, which indicates that CuO/BiFeO3 composite catalyst has an excellent photocatalytic stability. © 2020, Science Press. All right reserved.
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页码：1389 / 1398
页数：9
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