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Removal of cadmium and copper ions from aqueous solution with cellulose graft copolymers

机译:纤维素接枝共聚物去除水溶液中的镉和铜离子

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摘要

Cellulosic materials containing various amounts of grafted polyacrylonitrile and poly(acrylic acid)molecules were used to remove Cd(II)and Cu(II)ions from aqueous solution.It was found,that grafting enhanced the metal ion binding capacity of the cellulosic material; the extent of enhancement depended on the metal ion type,the level and nature of the incorporated graft polymer.The equilibrium sorption data fitted the Langmuir isotherm equation and values of maximum metal ion binding capacity,A_s and binding constant k,determined for the grafted cellulosic materials were markedly higher than for the unmodified cellulosic material.Reuse of the grafted cellulosic materials after one sorption cycle resulted in less than 10% reduction in the sorption capacity of the material,suggesting that the grafted cellulosic materials is a multiple-use adsorbent.Recovery of the adsorbed metal ions from the grafted cellulosic materials using 2%(v/v)HNO_3 was quantitative.
机译:使用含有多种接枝聚丙烯腈和聚丙烯酸分子的纤维素材料从水溶液中去除Cd(II)和Cu(II)离子,发现接枝可以增强纤维素材料的金属离子结合能力。增强的程度取决于金属离子的类型,结合的接枝聚合物的含量和性质。平衡吸附数据符合Langmuir等温线方程以及最大金属离子结合能力,A_s和结合常数k的值,由接枝纤维素确定该材料明显高于未改性的纤维素材料。一个吸附循环后对接枝纤维素材料的再利用导致该材料的吸附能力降低不到10%,这表明该接枝纤维素材料是一种多用途吸附剂。使用2%(v / v)HNO_3定量分析了从接枝纤维素材料中吸附的金属离子。

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