期刊
CHEMICAL ENGINEERING JOURNAL
卷 185, 期 -, 页码 91-99出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.01.035
关键词
BiOI/BiOBr; Heterostructure; Chemical etching; Photocatalysis; Methyl orange
资金
- Natural Science Foundation of China [20973071, 51172086]
- youth foundation of Huaibei Normal University [2011xqxm31]
BiOI/BiOBr heterostructures, synthesized by a simple chemical etching method using acetic acid and KI as etching agents to react with BiOBr particles, were characterized by X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), scanning electron microscope (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and Brunauer-Emmett-Teller (BET) surface area. The as-prepared samples exhibited more efficient photocatalytic activities than pure BiOI and BiOBr for the degradation of methyl orange (MO) under visible light irradiation (lambda > 420 nm), which could be attributed to the efficient separation of electron-hole pairs caused by the formation of BiOI-BiOBr heterojunction. Terephthalic acid photoluminescence (TA-PL) probing test and radical scavenger's experiments demonstrated that h(+), center dot O-2(-) and H2O2 were the dominant reactive species while (sic)OH could be negligible. A possible transfer process of photogenerated carriers was proposed based on the band structures of BiOI and BiOBr (c) 2012 Elsevier B.V. All rights reserved.
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