Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis

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	Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis
	Xiao, Jiadong 1,3,4; Xie, Yongbing 1,2,4; Cao, Hongbin 1,2,4; Nawaz, Faheem 3; Zhang, Shanshan 1; Wang, Yueqiu 2
刊名	JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
	2016-01-15
卷号	315 期号:JAN 页码:59-66
关键词	Photocatalysis Metal ion doping TiO2 Oxalic acid Reactive oxygen species
ISSN号	1010-6030
英文摘要	The key standpoint favors the role of doped metal ions as electron traps in enhancing surface-charge separation during TiO2 photocatalysis. Besides that, this study demonstrated two disparate impacts of metal ion doping on reactive species generation during TiO2 photocatalysis. Ag+ and Cu2+ outperformed other dopants in photooxidation of oxalic acid (OA), while further increasing their doping amount from the optimum value produced a negligible impact on the photocatalytic performance. This implied other dominant roles of doped metal ions other than electron captors, because an excessive amount of traps can serve as charge-recombination centers and largely decrease the photocatalytic activity. N-2 purging and NaF (a scavenger for surface-radicals) markedly reduced the mineralization rate after Ag+ doping, verifying the significance of dissolved oxygen (DO) in reactive species generation upon TiO2 surface. Non-(OH)-O-center dot reactive oxygen species (ROS) were found to account for 75% in OA mineralization, attributed to enhanced DO adsorption towards TiO2 surface by Ag+ doping. However, Cu2+ doping could facilitate the oxidation by h(vb)(+) plus (OHads)-O-center dot, which took as dominant a part as 53%. Ag+-Cu2+ co-doping integrated these two positive sides and more inclined to the role of Ag+. Correspondingly, surface oxidation dominated whereas liquid-phase oxidation weakened. (C) 2015 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
关键词[WOS]	VISIBLE-LIGHT ; OXALIC-ACID ; AQUEOUS-SOLUTION ; ORGANIC POLLUTANTS ; TITANIUM-DIOXIDE ; HYDROTHERMAL SYNTHESIS ; WASTE-WATER ; DEGRADATION ; NANOPARTICLES ; IRRADIATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000366230700008
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/20145]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	1.Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Being Engn Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Jiadong,Xie, Yongbing,Cao, Hongbin,et al. Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2016,315(JAN):59-66.
APA	Xiao, Jiadong,Xie, Yongbing,Cao, Hongbin,Nawaz, Faheem,Zhang, Shanshan,&Wang, Yueqiu.(2016).Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,315(JAN),59-66.
MLA	Xiao, Jiadong,et al."Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 315.JAN(2016):59-66.