Journal
APPLIED SURFACE SCIENCE
Volume 351, Issue -, Pages 1131-1139Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.06.098
Keywords
p-n heterojunction; BiOBr/BiPO4; Degradation; Photocatalysis
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Funding
- National Natural Science Foundation of China [51202056, 51372068]
- Hebei Natural Science Funds for Distinguished Young Scholar [B2014209304]
- Hebei Provincial Foundation for International cooperation [15391403D]
- Hebei Natural Science Funds for the Joint Research of Iron and Steel [B2014209314]
- Hebei Provincial Foundation for Returned Scholars [D2013005005]
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BiOBr nanoflakes-decorated BiPO4 (BiOBr/BiPO4) composite photocatalysts were prepared by a simple hydrothermal method. The BiOBr nanoflakes were tightly dispersed on the surface of the BiPO4 and formed p-n heterojunctions between BiOBr and BiPO4, as evidenced by characterization of the structure and composition. The p-n heterojunctions BiOBr/BiPO4 composites could greatly improve photocatalytic activity, and the 60 wt% BiOBr/BiPO4 composite showed the highest degrade rate for methylene blue (MB), which was eight times and two times than that of pure BiPO4 and BiOBr, meanwhile, the BiOBr/BiPO4 composite also exhibited superior activities for phenol degradation under visible light. The enhanced photocatalytic performance was attributed to the enhancement of visible-light absorption efficiency as well as the formation of p-n heterojunctions in BiOBr/BiPO4, which could greatly accelerate the separation efficiency of photogenerated charge carriers. In addition, the roles of the radical species were investigated, and the O-2(-) and h(+) were thought to dominate the photocatalytic process. Based on the experimental and theoretical results, the possible photocatalytic mechanism was proposed. (C) 2015 Elsevier B.V. All rights reserved.
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