Simultaneous oxidation of Mn (Ⅱ) and As (Ⅲ) on cupric oxide (CuO) promotes As (Ⅲ) removal at circumneutral pH  

作　　者：Lingqun Zeng Biao Wan Qian Wang Yupeng Yan Yuanzhi Tang Xionghan Feng 

机构地区：[1]State Environmental Protection Key Laboratory of Soil Health and Green Remediation,College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China [2]School of Earth and Atmospheric Sciences,Georgia Institute of Technology,Atlanta,GA 30332-0340,USA [3]Department of Environmental and Sustainable Engineering,University at Albany,SUNY,1400 Washington Avenue,Albany,NY 12222,USA [4]Geomicrobiology,Center for Applied Geosciences,University of Tuebingen,72076 Tuebingen,Germany. [5]Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province,College of Land Resources and Environment,Jiangxi Agricultural University,Nanchang 330045,China

出　　处：《Journal of Environmental Sciences》2023年第3期691-700,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 42030709, 42167031);the National Key Research and Development Program of China (No. 2017YFD0200201);Y.T. acknowledges support by the U.S. National Science Foundation (NSF) under Grant No. 2108688。

摘　　要：Oxidation of Mn (Ⅱ) or As(Ⅲ) by molecular oxygen is slow at pH<9,while they can be catalytically oxidized in the presence of oxide minerals and then removed from contaminated water.However,the reaction mechanisms on simultaneous oxidation of Mn(Ⅱ) and As (Ⅲ)on oxide mineral surface and their accompanied removal efficiency remain unclear.This study compared Mn (Ⅱ) oxidation on four common metal oxides (γ-Al_(2)O_(3),CuO,α-Fe2O_(3)and ZnO) and investigated the simultaneous oxidation and removal of Mn (Ⅱ) and As (Ⅲ) through batch experiments and spectroscopic analyses.Among the tested oxides,CuO and α-Fe2O_(3)possess greater catalytic activity toward Mn (Ⅱ) oxidation.Oxidation and removal kinetics of Mn (Ⅱ) and As (Ⅲ) on CuO indicate that O_(2)is the terminal electron acceptor for Mn (Ⅱ) and As (Ⅲ) oxidation on CuO,and Mn (Ⅱ) acts as an electron shuttle to promote As (Ⅲ) oxidation and removal.The main oxidized product of Mn (Ⅱ) on CuO is high-valent MnO_(x)species.This newly formed Mn (Ⅲ) or Mn (IV) phases promote As (Ⅲ) oxidation on CuO at circumneutral pH 8 and is reduced to Mn (Ⅱ),which may be then released into solution.This study provides new insights into metal oxide-catalyzed oxidation of pollutants Mn (Ⅱ) and As (Ⅲ) and suggests that CuO should be considered as an efficient material to remediate Mn (Ⅱ) and As(Ⅲ)contamination.

关 键 词：Simultaneous oxidation MN(II) AS(III) CUO Metal oxides 

分 类 号：X703[环境科学与工程—环境工程]