期刊
APPLIED SURFACE SCIENCE
卷 316, 期 -, 页码 93-101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.07.185
关键词
Nanomaterials; Bismuthyl carbonate; Hydrothermal synthesis; Photocatalysis; Heterojunction
类别
资金
- NSFCQ [cstc2012jjB0006]
- SRFDP [20110191110034, 20120191120039]
- NSFC [11204388]
Structure engineering enables us to design novel photocatalysts with high efficiency and stability. Here visible light absorbing Fe2O3 semiconductor is chosen as sensitizer to modify wide band-gap Bi2O2CO3 semiconductor in order to enhance its photocatalytic properties by shifting the UV-driven catalytic activity to visible-light-driven catalytic activity. The Bi2O2CO3@Fe2O3 nanosheets with exposed active {0 0 1} facet were fabricated by a facile one-step modified hydrothermal method. The thermal stability, crystal structure, morphology and optical band gap were characterized. The photocatalytic activities of the Bi2O2CO3 and Bi2O2CO3@Fe2O3 with different molar ratio of Fe2O3 to Bi2O2CO3 were compared. It was found that the Bi2O2CO3@Fe2O3 catalyst can degrade rhodamine-B within 25 min under the simulated sunlight, displaying greatly enhanced photocatalytic activity with respect to the Bi2O2CO3 catalyst. The photocatalyst showed good photostability and recyclability. A mixture of multi-colored dyes including rhodamine-B, methylene blue and methyl orange can be completely degraded by the Bi2O2CO3@Fe2O3 catalyst (5 mol% Fe2O3) within 45 min under the simulated sunlight irradiation. The photocatalytic mechanism was discussed in detail. (C) 2014 Elsevier B.V. All rights reserved.
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