Disparate roles of doped metal ions in promoting surface oxidation of TiO2 photocatalysis
Xiao, Jiadong1,3,4; Xie, Yongbing1,2,4; Cao, Hongbin1,2,4; Nawaz, Faheem3; Zhang, Shanshan1; Wang, Yueqiu2
2016-01-15
发表期刊JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN1010-6030
卷号315期号:JAN页码:59-66
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.
关键词Photocatalysis Metal Ion Doping Tio2 Oxalic Acid Reactive Oxygen Species
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.jphotochem.2015.09.013
收录类别SCI
语种英语
关键词[WOS]VISIBLE-LIGHT ; OXALIC-ACID ; AQUEOUS-SOLUTION ; ORGANIC POLLUTANTS ; TITANIUM-DIOXIDE ; HYDROTHERMAL SYNTHESIS ; WASTE-WATER ; DEGRADATION ; NANOPARTICLES ; IRRADIATION
WOS研究方向Chemistry
WOS类目Chemistry, Physical
项目资助者National Natural Science Foundation of China(21207133) ; National Key Technology RD Program(2011BAC06B09)
WOS记录号WOS:000366230700008
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20145
专题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
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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.
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