磁性黏土颗粒对污染土壤中镉去除作用的初步研究  

Preliminary Study on Removal of Cadmium from Contaminated Soil by Magnetic Clay Particles

作　　者：贠豪 李远[1,3] 杨帅 邱炜[2,3] 刘国明 朱侠 司绍诚 骆永明 YUN Hao;LI Yuan;YANG Shuai;QIU Wei;LIU Guoming;ZHU Xia;SI Shaocheng;LUO Yongming(Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Shandong Key Laboratory of Coastal Environmental Processes,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai,Shandong 264003,China;Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所),山东省海岸带环境过程重点实验室,中国科学院烟台海岸带研究所,山东烟台264003 [2]中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008 [3]中国科学院大学,北京100049

出　　处：《土壤》2021年第5期1015-1022,共8页Soils

基　　金：国家自然科学基金重大项目(41991330)资助。

摘　　要：本研究使用了一种毫米级磁性黏土颗粒吸附材料测试其对土壤Cd的去除性能,材料记为巯基改性凹凸棒@沸石(MSAZ)。通过对不同类型人工模拟Cd污染土试验表明,材料最佳施用量为MSAZ与土壤质量比1︰5,此时在人工模拟污染红壤中0.43 mol/L HNO_(3)提取态Cd的单次材料施用去除率高达95%,在人工模拟的棕壤和黑土也可达75%~80%。通过对实际的Cd高背景旱地土壤和Cd污染水稻土的去除试验表明,MSAZ对这两种土壤中0.43 mol/L HNO_(3)提取态Cd的首次施用去除率均约40%;经过5次重复利用后,MSZA对污染水稻土中0.43 mol/L HNO3提取态Cd的累积去除率可达98%,并且该材料依然保持着85%的吸附能力,回收率仍高于80%。本研究的磁性黏土颗粒具有较强的土壤Cd去除性能和应用潜力,可为农田土壤Cd污染的原位修复提供材料及技术支持。A millimeter-level magnetic clay particle adsorption material recorded as MSAZ was used to test its soil Cd removal efficiency.For different simulated Cd-contaminated soils,the results showed that the optimal mass ratio of MSAZ:soil was 1︰5.With this application ratio,the removal rate of 0.43 mol/L HNO_(3) extracted Cd in the simulated red soil was as high as 95% in a single application,and the removal rates could also reach 75%—80% in the brown and black soils.For dryland soils with high Cd background values and Cd-contaminated paddy soils,the results showed that the removal rate of 0.43 mol/L HNO_(3) extracted Cd by MSAZ was about 40% from the two soils in a single application.After five times of repeated use,the cumulative removal rate of 0.43 mol/L HNO_(3) extracted Cd on MSAZ reached 98% from the actual Cd-contaminated paddy soil.The MSAZ still maintained 85% adsorption capacity,and its recovery rate was higher than 80% after five reusing cycles.The magnetic clay particles tested in this study has excellent soil Cd removal performance and showed potential application prospect,which can provide materials and technical supports for subsequent in-situ treatment of Cd pollution in farmland soil.

关 键 词：镉 吸附法 磁性材料 黏土矿物 原位修复 农田土壤 

分 类 号：X53[环境科学与工程—环境工程]