期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 688, 期 -, 页码 1080-1087出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.07.128
关键词
Composite microrods; Bi2O3-BiVO4; Porous structure; p-n heterojunction; Solvothermal method; Z-scheme mechanism
资金
- Natural Science Foundation of China [21171146, 21371152]
- Zhejiang Provincial Natural Science Foundation of China [LR14B010001]
- Zhejiang Provincial Public Welfare Project [2016C31015]
- State Key Laboratory of Silicon Materials at Zhejiang University [2015-10]
- open project from State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology
In the present work, high-quality porous Bi2O3-BiVO4 composite microrods (CMRs) with a uniform size distribution have been successfully prepared through a facile solvothermal method followed by an annealing treatment, in which Bi(OH) C2O4-BiVO4 precursors were first synthesized using Na2C2O4 and NaVO3 as starting materials and then thermally decomposed to produce porous Bi2O3-BiVO4 p-n heterojunction CMRs. The as-prepared Bi2O3-BiVO4 product was characterized by UV-Vis diffuse reflectance spectroscopy (DRS) and valence-band X-ray photoelectron spectroscopy (XPS). Significantly enhanced photocatalytic activity in degrading colorless organic phenol under visible-light illumination (lambda > 420 nm) was observed with the porous CMRs, more than 48 times higher than that of the mixture of BiVO4 and Bi2O3, and 192 and 160 times higher than pure BiVO4 and Bi2O3, respectively. A direct Z-scheme mechanism was employed to describe the transfer of photogenerated electrons and holes in the Bi2O3-BiVO4 CMR system, and the dramatically enhancement of the observed photoactivity may be attributed to the high separation efficiency of electron-hole pairs, resulting from the p-n heterojunction formed in the porous structure. (C) 2016 Elsevier B.V. All rights reserved.
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