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Poly (styrene sulfonamides) with EDTA-like chelating groups for removal of transition metal ions

机译:具有EDTA类螯合基团的聚(苯乙烯磺酰胺)可去除过渡金属离子

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摘要

Chlorosulfonated styrene-divinyl benzene (10%) resin beads (420-590 mu m), when treated with an excess of triethylene tetramine (TETA), give a corresponding polymeric sulfonamide with three amine functions. The free amine functions of the resin were carboxymethylated almost quantitatively by reacting with 20% excess of potassium chloroacctate in aqueous solution. The resulting resin with iminoacetic acid functions showed rapid chelating abilities for transition metal ions such as Zn (II), Cd (II), Cu (EI), Ni (II), Co (II), and Fe (III) ions. At the neutral pi-Is the chelating resin was able to reduce the metal ion concentrations lower than 1 ppm in about 15 min of the contacting time. Interestingly, when the resin was used in sodium form, metal binding capacities were higher than the theoretical capacity (1.66 mmol.g(-1)), due to simultaneous precipitation of the transition metal hydroxides on bead particles. The resin samples loaded with metal ions can be regenerated more than 10 times by simple acid-base treatments, without activity loss. (C) 2000 John Wiley & Sons, Inc. [References: 16]
机译:当用过量的三亚乙基四胺(TETA)处理时,氯磺化的苯乙烯-二乙烯基苯(10%)树脂珠(420-590μm),得到具有三个胺官能的相应的聚合磺酰胺。通过与水溶液中20%过量的氯乙酸钾反应,几乎定量地将树脂的游离胺官能团羧甲基化。所得具有亚氨基乙酸功能的树脂显示出对过渡金属离子如Zn(II),Cd(II),Cu(EI),Ni(II),Co(II)和Fe(III)离子的快速螯合能力。在中性pi-Is下,螯合树脂能够在约15分钟的接触时间内将金属离子浓度降低至低于1 ppm。有趣的是,当树脂以钠形式使用时,由于过渡金属氢氧化物同时沉淀在珠粒上,因此金属的结合容量高于理论容量(1.66 mmol.g(-1))。负载金属离子的树脂样品可通过简单的酸碱处理再生10次以上,而不会损失活性。 (C)2000 John Wiley&Sons,Inc. [参考:16]

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