The impact of silver modification on the catalytic activity of iodine-doped titania for p-chlorophenol degradation under visible-light irradiation

被引：33
作者：
He, Zhiqiao [1 ]
Xie, Lei [1 ]
Song, Shuang [1 ]
Wang, Cheng [1 ]
Tu, Jinjun [1 ]
Hong, Fangyue [1 ]
Liu, Qi [2 ]
Chen, Jianmeng [2 ]
Xu, Xinhua [3 ]
机构：
[1] Zhejiang Univ Technol, Coll Biol & Environm Engn, Hangzhou 310032, Zhejiang, Peoples R China
[2] Zhejiang Univ Technol, Inst Environm Sci & Engn, Hangzhou 310032, Zhejiang, Peoples R China
[3] Zhejiang Univ, Dept Environm Engn, Hangzhou 310027, Peoples R China
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2010年 / 319卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
Photodegradation; Titanium dioxide; Silver; Iodine; 4-Chlorophenol; ENHANCED PHOTOCATALYTIC ACTIVITY; ANATASE TIO2; AG; MECHANISM; DIOXIDE; FILMS; NANOPARTICLES; PHOTODEGRADATION; 4-CHLOROPHENOL; TRANSFORMATION;
D O I：
10.1016/j.molcata.2009.12.003
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Iodine-doped titania photocatalysts (I-TiO2) were improved by doping the catalysts with different contents of silver (Ag-I-TiO2) to investigate the effect of silver modification on the structure and activity of the photocatalysts. The chemical and physical properties of the catalysts were determined by X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET) method, transmission electron microscopy (TEM), selected area electron diffraction pattern (SAED). X-ray photoelectron spectroscopy (XPS), and OV-vis diffuse reflectance spectra. The impact of silver modification on the photocatalytic activity was investigated via the photodegradation of p-chlorophenol (PCP) under visible-light irradiation. The significant enhancement of PCP degradation using Ag-I-TiO2, with an optimum silver content of 3% can be ascribed to the fact that the doped silver trapped photogenerated electrons and promoted the formation of Ti3+ and, hence, the inhibition of the recombination of electron-hole pairs. The probable pathway of PCP mineralization was mainly a surface charge process, caused by adsorbed (OH)-O-center dot radicals (center dot OHads), valence band holes (h(vb)(+)) and electrons (e(cb)(-)), which was verified by studying the effects of scavengers and nitrogen purging. (C) 2009 Elsevier B.V. All rights reserved.
引用
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页码：78 / 84
页数：7
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