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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Chelating adsorbent for heavy metal ions prepared by loading anion-exchange resin with thacalix[4]arenetetrasulfonate
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Chelating adsorbent for heavy metal ions prepared by loading anion-exchange resin with thacalix[4]arenetetrasulfonate

机译：载有噻唑[4]亚芳基四磺酸盐的阴离子交换树脂制备的重金属离子螯合吸附剂

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摘要

A chelating adsorbent for heavy metal ions has been prepared by loading an anion-exchange resin with thiacalix[4]arenetetrasulfonate (TCAS). Batchwise extraction studies have revealed a high adsorption ability of the TCAS-loaded resin toward heavy metal ions with high selectivity. The present resin strongly retained the heavy metal ions tested here [Co(II), Ni(II),Zn(II), Cd(II), Hg(II), and Pb(II)] in a slightly acidic to neutral pH region, while no adsorption was observed for alkaline earth metal ions, Mg(II) and Ca(II), in this pH region. These adsorption characteristics of the present resin should be ascribed to the contribution of the bridging sulfur of the loaded TCAS to selectively coordinate to metal ions categorized to be soft to intermediate Lewis acids by the Hard and Soft Acids and Bases (HSAB) rule. A continuous column adsorption system with the present resin allowed the selective and almost quantitative (more than 99.98%) removal of heavy metal ions.
机译：重金属离子的螯合吸附剂已通过在阴离子交换树脂中加入噻唑烷[4]芳烃四磺酸盐（TCAS）制备。间歇萃取研究表明，负载TCAS的树脂对重金属离子具有高选择性，并且具有很高的吸附能力。本发明的树脂在弱酸性至中性pH值下强力保留了此处测试的重金属离子[Co（II），Ni（II），Zn（II），Cd（II），Hg（II）和Pb（II）]。在此pH范围内，没有观察到碱土金属离子Mg（II）和Ca（II）的吸附。本发明树脂的这些吸附特性应归因于负载的TCAS的桥连硫对通过硬和软酸和碱（HSAB）法分类为软至中间路易斯酸的金属离子的选择性配位的贡献。用本发明的树脂进行的连续柱吸附系统允许选择性和几乎定量（大于99.98％）去除重金属离子。

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