QQ客服 官方微博 反馈留言

	Effects of surface modification of TiO2 with ascorbic acid on photocatalytic decolorization of an azo dye reactions and mechanisms
	Yan Ou ; Jing-Dong Lin ; Lin JD(林敬东) ; Hong-Mei Zou ; Dai-Wei Liao ; Liao DW(廖代伟)
	2005-08
关键词	TiO2 ascorbic acid methyl orange azo bond superoxides
英文摘要	The formation of surface modification on TiO2, which can be easily attained by a simple addition of ascorbic acid to aqueous ToO(2) suspensions, uniquely affects both photocatalytic reactions and mechanisms. Surface modification results in the formation of a colored surface complex that causes red shift of the absorption threshold of TiO2, enhancing utilization of the solar spectrum. The decolorization rate of methyl orange, taken as a model for recalcitrant azo-dye, was observed to be the function of surface modified TiO2 used during the process. It was found that surface modified TiO2 was more effective for oxidation of azo bond than pure TiO2 irradiated by both UV light and solar light. Through investigating the effects of dissolved oxygen, CCl4 and tert-butyl alcohol on the decolorization of methyl orange, the mechanisms are proposed that the superoxides (O-center dot(2)-) mediated oxidation pathways are dominant for cleavage of azo bond of methyl orange on surface modified TiO2 with ascorbic acid, whereas the OH radical mediated oxidation pathways are largely inhibited due to the hindered complexation of ascorbic acid on the surface of TiO2. Finally, elementary charge transfer process on surface modified TiO2 and the implication to photocatalytic reaction pathway are discussed. (c) 2005 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.molcata.2005.06.054]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Yan Ou,Jing-Dong Lin,Lin JD,et al. Effects of surface modification of TiO2 with ascorbic acid on photocatalytic decolorization of an azo dye reactions and mechanisms[J],2005.
APA	Yan Ou,Jing-Dong Lin,林敬东,Hong-Mei Zou,Dai-Wei Liao,&廖代伟.(2005).Effects of surface modification of TiO2 with ascorbic acid on photocatalytic decolorization of an azo dye reactions and mechanisms..
MLA	Yan Ou,et al."Effects of surface modification of TiO2 with ascorbic acid on photocatalytic decolorization of an azo dye reactions and mechanisms".(2005).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。