磁性固体螯合剂(MSC-IDA)对土壤镉污染的移除净化  

Cd removal from contaminated soil by magnetic solid chelator microparticles(MSC-IDA)

作　　者：范力仁[1,2] 宋吉青[3] 周洋[1,2] 赵攻城 白文波[3] 李枭铭 栗海峰[1] 张引[1,2] 周小丹[1,2] 刘路[1,2] 

机构地区：[1]中国地质大学(武汉)材料与化学学院,武汉430074 [2]武汉中地金盾环境科技有限公司,武汉430206 [3]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《环境化学》2017年第6期1204-1212,共9页Environmental Chemistry

基　　金：国家863项目基金(2011AA100503);催化材料科学湖北省重点实验室开放基金(CHCL06008)资助~~

摘　　要：为解决磁性粉末易被土壤颗粒吸附包覆影响其吸附效果的问题,提出一种基于磁选移除净化的土壤修复方法.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,接枝亚胺二乙酸官能团,制备了直径为10—100μm的磁性固体螯合剂(MSC-IDA);并表征了其结构、形貌、组成和性质.结果表明,经包覆修饰后的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Qmax=22.8 mg·g^(-1);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 was reported. In order to solve the problem that Nano-MSC-IDA is easily adsorbed and covered with the soil particles,and loses its adsorption capacity, micro-MSC-IDA was prepared via inorganic-organic and organic synthesis reactions with core-shell microspheres Fe3O4@ Si O2 by graft IDA with 10—100 μm. The structure,morphology,composition and property of the composite were characterized. Results showed that MSC-IDA had a good magnetic separation performance. The max adsorption capacity of MSC-IDA for Cd（Ⅱ） was 22.8 mg·g^-1at pH 7.0; MSC-IDA had the ability of chelating various from of Cd2＋in soil including water-soluble, ion-exchangeable, carbonate-bound, iron-manganese oxide-bound from,and transforming the ions into magnetic solid chelates（MSC-IDA-M） that was easily separatedmagnetically,resulting in the removal rate of approximately 84.9% for Cd.

关 键 词：磁性固体螯合剂 螯合捕集 土壤重金属污染 镉 移除净化 

分 类 号：X53[环境科学与工程—环境工程]