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Arsenic and cadmium removal from water by a calcium-modified and starch-stabilized ferromanganese binary oxide

查看全文 作　　者：Huxing [1]Chen;Fangnan [1]Xu;Zhengzheng [2]Chen;Ouyuan [2]Jiang;Williamson [3]Gustave;Xianjin [2]Tang 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;[2]Institute of Soil and Water Resources and Enuironmental Science,Zhejiang Prouincial Key Laboratory of Agricultural Resources and Enuironment,Zhejiang Uniuersity,Hangzhou 310058,China;[3]School of Chemistry,Enuironmental&Life Sciences,Uniuersity of The Bahamas,New Prouidence,Nassau,The Bahamas高影响力机构 出　　处：《Journal of Environmental Sciences》索引2020年第32卷第10期,共8页高影响力期刊 基　　金：supported by the National Key Technology R&D Program (No.2018YFD0800202)。 摘　　要：A new calcium-modified and starch-stabilized ferromanganese binary oxide (Ca-SFMBO)sorbent was fabricated with different Ca concentrations for the adsorption of arsenic (As)and cadmium (Cd) in water.The maximum As(Ⅲ) and Cd(Ⅱ) adsorption capacities of 1%CaSFMBO were 156.25 mg/g and 107.53 mg/g respectively in single-adsorption systems.The adsorption of As and Cd by the Ca-SFMBO sorbent was pH-dependent at values from 1 to 7,with an optimal adsorption pH of 6.In the dual-adsorbate system,the presence of Cd(Ⅱ) at low concentrations enhanced As(Ⅲ) adsorption by 33.3%,while the adsorption of As(Ⅲ) was inhibited with the increase of Cd(Ⅱ) concentration.Moreover,the addition of As(Ⅲ) increased the adsorption capacity for Cd(Ⅱ) up to two-fold.Through analysis by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR),it was inferred that the mechanism for the co-adsorption of Cd(Ⅱ) and As(Ⅲ) included both competitive and synergistic effects,which resulted from the formation of ternary complexes.The results indicate that the Ca-SFMBO material developed here could be used for the simultaneous removal of As(Ⅲ) and Cd(Ⅱ) from contaminated water. 关 键 词：ARSENIC CADMIUM CALCIUM Fe–Mn binary oxide COMPLEXATION Adsorption
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