改性凹凸棒土对土壤中Cd^(2+)吸附解吸及钝化效果影响  

EFFECT OF MODIFIED ATTAPULGITE ON THE ADSORPTION,DESORPTION AND IMMOBILIZATION OF Cd^(2+) IN SOIL

作　　者：章绍康 弓晓峰 申钊颖[1,2] 易佳璐 邱滋璐 ZHANG Shao-kang;GONG Xiao-feng;SHEN Zhao-ying;YI Jia-lu;QIU Zi-lu(School of Resources, Environmental and Chemical Engineering, Nanchang University , Nanchang 330031 , China;Key Laboratory of Poyang Lake Environment and Resource Utilization of MOE , Nanchang University, Nanchang 330047 , China;Zhejiang Land Consolidation and Rehabilitation, Hangzhou 310007 , China)

机构地区：[1]南昌大学资源环境与化工学院,南昌330031 [2]南昌大学鄱阳湖环境与资源利用教育部重点实验室,南昌330047 [3]浙江省土地整理中心,杭州310007

出　　处：《环境工程》2019年第3期192-197,共6页Environmental Engineering

基　　金：国家自然科学基金项目(41761095);江西省研究生创新项目(YC2017-B003)

摘　　要：以凹凸棒土为原材料进行了热改性、酸改性、壳聚糖负载改性,并采用SEM、FT-IR、XRD表征其结构变化。通过改性凹凸棒土对土壤Cd^(2+)吸附解吸及土柱淋溶实验表明:凹凸棒土及改性凹凸棒土均能有效提高土壤对Cd^(2+)的吸附容量,减少Cd^(2+)的纵向迁移,降低淋溶风险。改性凹凸棒土主要是通过降低土壤中Cd的交换态和碳酸结合态含量增加土壤中Cd的铁锰氧化结合态及有机态含量,达到钝化土壤中Cd效果,综合处理效果优劣顺序为热改性凹凸棒土>酸改性凹凸棒>凹凸棒土>壳聚糖改性凹凸棒土>空白。Thermal modification,acid modification and chitosan loading modification were performed using attapulgite as a raw material. The structure was characterized by SEM,FT-IR and XRD. Adsorption and desorption of soil and soil column leaching experiments by modified attapulgite showed that attapulgite and modified attapulgite could effectively increase the Cd^2+ adsorption capacity of the soil,reduce the longitudinal migration of Cd^2+ and risk of leaching. The modified attapulgite mainly increased the oxidized and organic iron-manganese content of Cd by reducing the exchangeable state and carbonation-bound content of Cd to immobilization Cd in soil. Comprehensive treatment showed that thermal modified attapulgite>acid modified attapulgite>attapulgite>chitosan loading modified attapulgite>Blank.

关 键 词：改性凹凸棒土 Cd2+ 土壤 吸附解吸 土柱淋溶 

分 类 号：X53[环境科学与工程—环境工程]