期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 319, 期 1-2, 页码 78-84出版社
ELSEVIER
DOI: 10.1016/j.molcata.2009.12.003
关键词
Photodegradation; Titanium dioxide; Silver; Iodine; 4-Chlorophenol
资金
- National Natural Science Foundation of China [20977086]
- National Basic Research Program of China [2009CB421603]
- Zhejiang Provincial Natural Science Foundation of China [25080207, R5090033]
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.
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