磁性纳米S-ZnFe_(2)O_(4)作用下土壤Cd(Ⅱ)的淋溶释放  

Leaching release behavior of soil Cd(Ⅱ)under the magnetic nano-S-ZnFe_(2)O_(4)

作　　者：肖鑫 霍婷婷[1,2] 张伟 黄强 张义烽 马源聪 郭铭 雷艳 尹菟囡[1,2] XIAO Xin;HUO Tingting;ZHANG Wei;HUANG Qiang;ZHANG Yifeng;MA Yuancong;GUO Ming;LEI Yan;YIN Tunan(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Eduacation,Mianyang 621010,China;Analytical Test Center,Southwest University of Science and Technology,Mianyang 621010,China;Ecological Environment Monitoring Central Station,Mianyang 621050,China)

机构地区：[1]西南科技大学环境与资源学院,绵阳621010 [2]固体废物处理与资源化教育部重点实验室,绵阳621010 [3]西南科技大学分析测试中心,绵阳621010 [4]四川省绵阳生态环境监测中心站,绵阳621050

出　　处：《环境工程学报》2024年第7期1977-1986,共10页Chinese Journal of Environmental Engineering

基　　金：四川省自然科学基金项目(2022NSFSC1223)。

摘　　要：通过土柱淋溶实验探究了S-ZnFe_(2)O_(4)磁性纳米材料作用下,镉污染土壤中Cd(Ⅱ)的转化及淋溶释放行为。结果表明:S-ZnFe_(2)O_(4)对土壤镉有较好的钝化效果;在淋溶液pH为5,S-ZnFe_(2)O_(4)用量为1.5%(wt)的条件下,镉含量为5.69 mg·kg^(-1)的污染土壤中Cd(Ⅱ)的淋溶释放量较空白组减少96.02%,S-ZnFe_(2)O_(4)的平均磁选回收率可达77.94%;SZnFe_(2)O_(4)主要通过表面络合、离子交换及静电吸引等作用实现土壤Cd(Ⅱ)的吸附,土壤中大量高活性镉转变为铁锰氧化态及有机结合态,可交换态和碳酸盐结合态镉占比分别降低34.13%和22.65%。共存Pb(Ⅱ)、Zn(Ⅱ)、Cr(Ⅲ)、Ni(Ⅱ)离子促进材料对Cd(Ⅱ)的滞固作用,而Cu(Ⅱ)使Cd(Ⅱ)的淋溶量增加了12.92%。所制备的S-ZnFe_(2)O_(4)磁性纳米材料具有高吸附性、可磁选回收性及制备方法简单的优点,可大大降低土壤Cd(Ⅱ)的活性,降低土壤镉释放污染地下水的风险,研究可为镉污染土壤的修复提供参考。A soil column leaching test was carried out to study the leaching release behavior of Cd(Ⅱ)in cadmium-contaminated soil under the S-ZnFe_(2)O_(4) magnetic nanomaterials.The results showed that S-ZnFe_(2)O_(4) had a superior passivation effect on soil Cd.Cd(Ⅱ)leaching release from contaminated soil with Cd content of 5.69 mg·kg^(-1)was reduced by 96.02%compared with that of the blank group,when the leaching solution pH was 5,and the dosage of S-ZnFe_(2)O_(4) was 1.5%(wt),and the average effective recovery with magnetic separation recovery of S-ZnFe_(2)O_(4) could reach 77.94%.The adsorption of soil Cd(Ⅱ)by S-ZnFe_(2)O_(4) was mainly through surface complexation,ion exchange,and electrostatic attraction,a large amount of cadmium with high activity in the soil was transformed into Fe-Mn oxides-bound forms and organic matter-bound forms,and the proportion of cadmium in exchangeable forms and carbonate-bound forms decreased by 34.13%and 22.65%,respectively.The coexistence of Pb(Ⅱ),Zn(Ⅱ),Cr(Ⅲ),and Ni(Ⅱ)ions promoted the immobilization of Cd(Ⅱ)of the material,while Cu(Ⅱ)increased the leaching of Cd(Ⅱ)by 12.92%.The as-prepared S-ZnFe_(2)O_(4) magnetic nanomaterials have the advantages of being highly adsorptive,recoverable by magnetic separation and simple preparation method,which can greatly reduce soil Cd(Ⅱ)activity and lower the risk of groundwater contamination by soil Cd release.This study provides valuable insights for the remediation of cadmiumcontaminated soil.

关 键 词：土柱淋溶 镉污染土壤 S-ZnFe_(2)O_4 钝化 

分 类 号：X53[环境科学与工程—环境工程]