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磁性固体螯合剂(MSC-IDA)对土壤镉污染的移除净化
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摘要
一种基于磁选净化的土壤修复方法已经被报道了,为了弄清其螯合转化机理,通过无机-有机杂化反应对核壳结构Fe_3O_4@SiO_2进行表面修饰亚胺二乙酸官能团,制备了磁性固体螯合剂;并表征了其结构、形貌、组成和性质.结果表明,经SiO_2包覆修饰后MSC-IDA仍具有良好的磁分离性能;在pH=7.0的水溶液中对Cd~(2+)的最大吸附容量Q_(max)=22.8mg/g;MSC-IDA能螯合捕集农田土壤中水溶态、离子交换态、碳酸盐结合态、铁锰氧化物结合态的镉,转化成MSC-IDA-Cd磁性固体螯合物,对指定土壤中镉重金属污染去除率高达84.9%,能够实现土壤中非磁性重金属污染的磁选移除净化.
A soil remediation method based on magnetic beneficiation has been reported. In order to research on the adsorption mechanics of MSC-IDA, MSC-IDA was prepared via inorganic-organic and organic synthesis reactions with Core-shell microspheres Fe3O4@Si O2 by graft iminodiacetic acid(IDA).The structures,morphology, component and property of the composites were characterized by means of modern testing techniques. Results showed that MSC-IDA has a good magnetic separation performance. The max adsorption capacities of MSC-IDA for Cd(Ⅱ)was 22.8 mg/g with the p H=7.0; MSC-IDA has the ability to chelate heavy metal ions(M) such as water-soluble, interchangeable, carbonate-bound, iron-manganese oxide-bound, into soluble magnetic solid that was easy to separate magnetically, resulting in the removal rate of approximately 84.9% for Cd.
引文
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