DOI: 10.1016/j.watres.2018.06.072
Scopus记录号: 2-s2.0-85053183682
论文题名: Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species
作者: Ding W. ; Xu J. ; Chen T. ; Liu C. ; Li J. ; Wu F.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 599
结束页码: 607
语种: 英语
英文关键词: As(III) oxidation
; Direct electron transfer
; Fe(II)/Fe(III)−As(III) complex
; Fe(IV) intermediate
; Fenton-like reaction
Scopus关键词: Electron transitions
; Enzymes
; Molecular oxygen
; Oxidation
; Reaction intermediates
; Redox reactions
; As oxidation(III)
; Direct electron transfer
; Fenton reactions
; Fenton-like reactions
; Ferric hydroxide
; Formation constants
; Partial oxidations
; Super oxide dismutase
; Iron compounds
; arsenic
; complexation
; hydrogen peroxide
; iron
; oxidation
; phosphate (inorganic)
; redox conditions
; scavenging (chemistry)
英文摘要: Previous studies have shown that the oxidation of Fe(II) by molecular oxygen can lead to the co-oxidation of As(III) at neutral pH. However, the mechanism of As(III) oxidation in the presence of Fe(II) with respect to the interaction between As(III) and Fe(II) is still unclear. In this work, we examined the oxidation of As(III) in the presence of Fe(II) in air-saturated water, which is affected by pH, co-existing phosphate, and scavengers (tert-butanol, superoxide dismutase, catalase and dimethylsulfoxide). Results confirm that the formation of the Fe(II)–As(III) complex (formation constant, KFe(II)–As(III) = 103.86 M–1) plays an extremely important role in the initial stage of As(III) oxidation at pH 7.25. The oxidation of Fe(II)–As(III) promotes the production of H2O2 and colloidal ferric hydroxide. H2O2 reacts with the Fe(II)–As(III) complex through oxidizing Fe(II) to Fe(IV), which then causes the partial oxidation (ca. 50%) of As(III). The other part of As(III) oxidation by H2O2 occurs, in the form of Fe(III)–As(III) complex, through direct electron transfer from As(III) to H2O2 but not through Fe(IV). This work provides new mechanistic insight into arsenic and iron redox chemistry in the environment and furthers our understanding of Fenton reactions at neutral pH. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112595
Appears in Collections: 气候减缓与适应
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作者单位: Hubei Key Lab of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, China; Guangdong Key Laboratory of Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou, 510650, China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
Recommended Citation:
Ding W.,Xu J.,Chen T.,et al. Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species[J]. Water Research,2018-01-01,143