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Simultaneous removal of Cu(Ⅱ) and Cr(Ⅵ) by Mg–Al–Cl layered double hydroxide and mechanism insight

查看全文 作　　者：Xianyang [1]Yue;Weizhen [2]Liu;Zuliang [3]Chen;Zhang [1,2]Lin 高影响力作者 机构地区：[1]Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences;[2]School of Environment and Energy,South China University of Technology;[3]Centre for Environmental Risk Assessment and Remediation,University of South Australia高影响力机构 出　　处：《Journal of Environmental Sciences》索引2017年第29卷第3期,共11页高影响力期刊 基　　金：supported by the National Basic Research Program (973) of China (No.2010CB933501);the National Natural Science Foundation of China (No.21477128);The National Science Fund for Distinguished Young Scholars (No.21125730) 摘　　要：Mg–Al–Cl layered double hydroxide(Cl-LDH) was prepared to simultaneously remove Cu(Ⅱ)and Cr(VI) from aqueous solution. The coexisting Cu(Ⅱ)(20 mg/L) and Cr(VI)(40 mg/L) were completely removed within 30 min by Cl-LDH in a dosage of 2.0 g/L; the removal rate of Cu(Ⅱ) was accelerated in the presence of Cr(VI). Moreover, compared with the adsorption of single Cu(Ⅱ) or Cr(VI), the adsorption capacities of Cl-LDH for Cu(Ⅱ) and Cr(VI) can be improved by 81.05% and 49.56%, respectively, in the case of coexisting Cu(Ⅱ)(200 mg/L) and Cr(VI)(400 mg/L). The affecting factors(such as solution initial p H, adsorbent dosage, and contact time) have been systematically investigated. Besides, the changes of p H values and the concentrations of Mg^(2+) and Al^(2+)in relevant solutions were monitored. To get the underlying mechanism, the Cl-LDH samples before and after adsorption were thoroughly characterized by X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. On the basis of these analyses, a possible mechanism was proposed. The coadsorption process involves anion exchange of Cr(VI) with Cl-in Cl-LDH interlayer, isomorphic substitution of Mg^(2+) with Cu^(2+), formation of Cu_2Cl(OH)_3precipitation, and the adsorption of Cr(VI) by Cu_2Cl(OH)_3. This work provides a new insight into simultaneous removal of heavy metal cations and anions from wastewater by Cl-LDH. 关 键 词：ADSORPTION Heavy metals Layered double hydroxide Anion exchange PRECIPITATION
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