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Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species
Wei Ding;   Jing Xu;   Tao Chen;   Chengshuai Liu;   Jinjun Li;   Feng Wu
2018
Source PublicationWater Research
Volume143Pages:599-607
Abstract

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(Ill) 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, K-Fe(II)(-As(III))=10(3.86) 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. 

KeywordFe(Ii)/Fe(Iii) As(Iii) Complex As(Iii) Oxidation Fenton-like Reaction Fe(Iv) Intermediate Direct Electron Transfer
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8863
Collection环境地球化学国家重点实验室
Affiliation1.Hubei Key Lab of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, P. R. CHINA
2.Guangdong Key Laboratory of Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou, 510650, PR China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, PR China
Recommended Citation
GB/T 7714
Wei Ding; Jing Xu; Tao Chen; Chengshuai Liu; Jinjun Li; Feng Wu. Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species[J]. Water Research,2018,143:599-607.
APA Wei Ding; Jing Xu; Tao Chen; Chengshuai Liu; Jinjun Li; Feng Wu.(2018).Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species.Water Research,143,599-607.
MLA Wei Ding; Jing Xu; Tao Chen; Chengshuai Liu; Jinjun Li; Feng Wu."Co-oxidation of As(III) and Fe(II) by oxygen through complexation between As(III) and Fe(II)/Fe(III) species".Water Research 143(2018):599-607.
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