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Effects of cobalt doping on the reactivity of hausmannite for As(Ⅲ)oxidation and As(Ⅴ)adsorption

Journal of Environmental Sciences 2022年第12期34卷 217-226页

作者： Shuang Zhang Hui Li Zhongkuan Wu Jeffrey EPost Bruno Lanson Yurong Liu Biyun Hu Mingxia Wang Limei Zhang Mei Hong Fan Liu Hui Yin Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River) Ministry of Agriculture and Rural affairsCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China State Environmental Protection Key Laboratory of Soil Health and Green Remediation Ministry of Ecology and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Department of Crop and Soil Sciences North Carolina State UniversityRaleighNorth Carolina 27695USA College of Environment Zhejiang University of TechnologyHangzhou 310014China Department of Mineral Sciences NHB 119Smithsonian InstitutionWashington DC 20013-7012USA UniversitéGrenoble Alpes Grenoble F-38000France CNRS IRDUniversity of Savoy Mont BlancFrance ISTerre UniversitéGustave EiffelFrance The Forestry Prospect Design Institute Of Hubei Province Wuhan 430070China College of Grassland Resources and EnvironmentInner Mongolia Agricultural UniversityHohhot 010018China

Hausmannite is a common low valence Mn oxide mineral,with a distorted spinel structure,in surficial *** natural Mn oxides often contain various impurities of transitional metals(TMs),few studies have addressed the effect and related mechanism of TM doping on the reactivity of hausmannite with metal ***,the reactivity of cobalt(Co)doped hausmannite with aqueous As(Ⅲ)and As(Ⅴ)was *** doping decreased the point of zero charge of hausmannite and its adsorption capacity for As(Ⅴ).Despite a reduction of the initial As(Ⅲ)oxidation rate,Co-doped hausmannite could effectively oxidize As(Ⅲ)to As(Ⅴ),followed by the adsorption and fixation of a large amount of As(Ⅴ)on the mineral *** K-edge EXAFS analysis of the samples after As(Ⅴ)adsorption and As(Ⅲ)oxidation revealed that only As(Ⅴ)was adsorbed on the mineral surface,with an average As-Mn distance of 3.25–3.30 A,indicating the formation of bidentate binuclear *** results provide new insights into the interaction mechanism between TMs and low valence Mn oxides and their effect on the geochemical behaviors of metal pollutants.

关键词： Mn oxide Hausmannite Transition-metal Cobalt arsenate adsorption Arsenite oxidation

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