Pedosphere 33(1): 185--193, 2023
ISSN 1002-0160/CN 32-1315/P
©2023 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Chemical oxidation of arsenic in the environment and its application in remediation: A mini review
Chaolei YUAN1, Qi LI1, Zhaoyang SUN1, Wenjun ZHANG1, Jiangrong CHEN2, Zheng CHEN3, Shuo NA1, and Hongwen SUN1
1 Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350(China)
2 The Institute of Seawater Desalination and Multipurpose Utilization, Ministry of Natural Resources, Tianjin 300192(China)
3 Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou 215123(China)
Corresponding Author:Chaolei YUAN
      Arsenic (As) contamination in soil and water poses a serious threat to the ecosystem health and human beings, and is of widespread concern. The main As species found in soil and water are arsenite As(III) and arsenate As(V). Because As(III) is more toxic and often more mobile than As(V), many remediation strategies aim to oxidize As(III) to As(V). In the environment, the reduction of As(V) under anaerobic conditions is mainly mediated by microorganisms, but the oxidation of As(III) under aerobic conditions can be mediated primarily by chemical processes. This article first reviews the existing knowledge on chemical oxidation of As(III) in the environment, with an emphasis on the roles of iron (Fe) and manganese (Mn) oxides. The application of Fe and Mn oxides for the remediation of As-contaminated soil and water is then summarized. The oxidation of As(III) by oxygen is very slow in the absence of catalysts. Many Mn oxides, on the other hand, can efficiently oxidize As(III). Although the oxidation of As(III) by Fe(III) is also slow, this process can be accelerated by light or Fe(II). Iron and Mn oxides are widely used for the remediation of As-contaminated soil and water, with Fe oxides generally acting as absorbents while Mn oxides as oxidants. To better understand and regulate As transformation and transport in the environment, further study is needed on the mechanisms and influencing factors of As(III) oxidation by Fe and Mn oxides, and the development of innovative methods and materials based on Fe and Mn oxides are desired.
Key Words:  As contamination,iron oxide,manganese oxide,soil,water
Citation: Yuan C L, Li Q, Sun Z Y, Zhang W J, Chen J R, Chen Z, Na S, Sun H W. 2023. Chemical oxidation of arsenic in the environment and its application in remediation: A mini review. Pedosphere. 33(1): 185-193.
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