Enhancement of photocatalytic activity of TiO2 film electrode by in situ photoelectro-generating active chlorine

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	Enhancement of photocatalytic activity of TiO2 film electrode by in situ photoelectro-generating active chlorine
	X. F. Cheng; W. H. Leng; O. Y. Pi; Z. Zhang; J. Q. Zhang; C. N. Cao
	2007
发表期刊	Transactions of Nonferrous Metals Society of China
ISSN	1003-6326
卷号	17 期号:5 页码:1087-1092
摘要	The photoelectrocatalytic activity of TiO2 film electrodes in the degradation of nitrite ion was greatly enhanced in the presence of chlorine ion. The influences of NaCl concentration and initial pH value on the degradation rate of NO2- and active chlorine production were studied. The results show that the decay rate of NO2- and the accumulation rate of active chlorine increase with increasing NaCl concentration. At pH<8, both the decay of NO2- and active chlorine formation rates are enhanced with increasing NaCl concentration, while at pH>10, they are suppressed. In addition, contrast to conventionally accepted view, in which an advantage of anatase over the rutile modification of TiO2 is in terms of photoactivity, it is found that a thermal oxidation rutile TiO2 electrode is more suitable for both photogenerating active, chlorine and degrading NO2- in the presence of Cl-. The correlative mechanism was also discussed in detail. Specific adsorption of Cl- on the electrode causes its energy band edges to move towards positive value and also lower the photocurrent, thus less OH center dot radicals are produced. However; more active species of Cl- that have longer lifetime are available to take part in the oxidation ofNO(2)(-), thus improving its degradation rate.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, state key lab corros & protect met, inst met res, shenyang 110016, peoples r china.;leng, wh (reprint author), zhejiang univ, dept chem, hangzhou 310027, peoples r china;lengwh@css.zju.edu.cn
关键词	Tio2 Photoelectrocatalysis Active Chlorine Nitrite Ion Aqueous-solution Nitrite Ion Degradation Oxidation Kinetics Aniline Water Dye
URL	查看原文
WOS记录号	WOS:000250788400037
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33483
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. F. Cheng,W. H. Leng,O. Y. Pi,et al. Enhancement of photocatalytic activity of TiO2 film electrode by in situ photoelectro-generating active chlorine[J]. Transactions of Nonferrous Metals Society of China,2007,17(5):1087-1092.
APA	X. F. Cheng,W. H. Leng,O. Y. Pi,Z. Zhang,J. Q. Zhang,&C. N. Cao.(2007).Enhancement of photocatalytic activity of TiO2 film electrode by in situ photoelectro-generating active chlorine.Transactions of Nonferrous Metals Society of China,17(5),1087-1092.
MLA	X. F. Cheng,et al."Enhancement of photocatalytic activity of TiO2 film electrode by in situ photoelectro-generating active chlorine".Transactions of Nonferrous Metals Society of China 17.5(2007):1087-1092.