Visible light photocatalytic activity enhancement and mechanism of AgBr/Ag3PO4 hybrids for degradation of methyl orange
Visible light photocatalytic activity enhancement and mechanism of AgBr/Ag3PO4 hybrids for degradation of methyl orange
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AgBr/Ag3PO4杂化物降解甲基橙的可见光光催化活性增强及机理
DOI：
10.1016/j.jhazmat.2012.03.002
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发表时间：
2012-05-30
影响因子：
13.6
通讯作者：
Chen, Shifu
中科院分区：
文献类型：
--
作者：
Cao, Jing;Luo, Bangde;Chen, Shifu
采用原位阴离子交换法制备了新型AgBr/Ag3PO4杂化材料，并用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)、能谱仪(EDS)和紫外-可见漫反射光谱(DRS)对其进行了表征。在可见光(波长420 nm)下，AgBr/Ag3PO4对甲基橙(MO)具有较高的光催化活性。X-射线光电子能谱(XPS)分析表明，AgBr/Ag3PO4在5次循环实验后仍保持良好的光催化活性，为Ag@AgBrAg3PO4@Ag体系。此外，不同清除剂的猝灭效果证明，反应中心点H和h(+)对MO的降解起主要作用。AgBr/Ag3PO4光催化活性的提高与AgBr和Ag3PO4之间匹配的带势所产生的电子-空穴对的有效分离以及在光催化反应过程中在AgBr和Ag3PO4颗粒表面原位形成的银纳米颗粒具有良好的电子捕获作用密切相关。(C)2012爱思唯尔B.V.保留所有权利。
Novel AgBr/Ag3PO4 hybrids were synthesized via an in situ anion-exchange method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and UV-vis diffuse reflectance spectroscopy (DRS). Under visible light (lambda > 420 nm), AgBr/Ag3PO4 degraded methyl orange (MO) efficiently and displayed much higher photocatalytic activity than that of pure AgBr or Ag3PO4. X-ray photoelectron spectroscopy (XPS) suggests that AgBr/Ag3PO4 transformed to be Ag@AgBr/Ag3PO4@Ag system while remained good photocatalytic activity after 5 times of cycle experiments. In addition, the quenching effects of different scavengers proved that reactive center dot H and h(+) played the major role for the MO degradation. The photocatalytic activity enhancement of AgBr/Ag3PO4 is closely related to the efficient separation of electron-hole pairs derived from the matching band potentials between AgBr and Ag3PO4, as well as the good electron trapping role of Ag nanoparticles in situ formed on the surfaces of AgBr and Ag3PO4 particles during the photocatalytic reaction. (C) 2012 Elsevier B.V. All rights reserved.