Z-scheme heterojunction Ag/AgBr/Bi2MoO6 with improved visible-light-induced photocatalytic activity

被引：5
作者：
Chen, Lifang [1 ]
Ding, Li [1 ]
Cheng, Hongye [1 ]
Qi, Zhiwen [1 ]
机构：
[1] East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China
来源：
BULLETIN OF MATERIALS SCIENCE | 2022年 / 45卷 / 03期
基金：
上海市自然科学基金; 中国国家自然科学基金;
关键词：
Bi2MoO6; Ag; AgBr; Z-scheme; visible light; photocatalysis; PLASMONIC PHOTOCATALYST; HYDROTHERMAL SYNTHESIS; E; COLI; COMPOSITE; CONSTRUCTION; DEGRADATION; FABRICATION; BI2MOO6; AG; PERFORMANCE;
D O I：
10.1007/s12034-022-02694-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A hierarchical Ag/AgBr/Bi2MoO6 heterojunction composite was prepared without the addition of any structure-directing agent via a hydrothermal synthesis combined with subsequent deposition-photoreduction. The obtained samples were characterized by X-ray diffraction, field-emission scanning electron microscopy containing an energy X-ray dispersive spectrometer, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The results demonstrate that the Ag/AgBr/Bi2MoO6 composite exhibited enhanced photocatalytic activity under visible-light irradiation for rhodamine B degradation with a rate constant of 0.180 min(-1), which was approximately 2.5 times than that of Ag/AgBr and 22.5 times as high as Bi2MoO6. In addition, the superior visible light removing efficiencies of methylene blue and colourless phenol further confirmed the broad-spectrum photocatalytic degradation abilities of the Ag/AgBr/Bi2MoO6. Moreover, based on band structure analysis and active species trapping experiments, the improved photocatalytic performance of the Ag/AgBr/Bi2MoO6 photocatalyst was ascribed to the construction of Z-scheme bridge using Ag nanoparticles, which could increase the separation efficiency of photogenerated electron-hole pairs and keep them with high reduction and oxidation capability.
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页数：11
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