壳聚糖(改性)-沸石对农田土壤重金属镉钝化技术研究  

Immobilizing Cadmium in Paddy Soil by Using Modified Chitosan-Zeolite

作　　者：罗宁临 李忠武[1] 黄梅[1] 文佳骏 LUO Ninglin;LI Zhongwu;HUANG Mei;WEN Jiajun(College of Environmental Science and Technology,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2020年第4期132-140,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51521006);湖南省科技重点研发资助项目(2015SK2004)。

摘　　要：土壤中镉的污染严重威胁着人类的身体健康.采用壳聚糖(改性)-沸石作为土壤修复剂具有成本低、材料范围广等特点.本文通过将改性后的壳聚糖负载到沸石上,制得壳聚糖(改性)-沸石(N-亚甲基壳聚糖次磷酸酯-沸石(ZHC)、N-亚甲基壳聚糖亚磷酸酯-沸石(ZPC))钝化剂,并进行相应的钝化实验.通过实验数据分析,得到污染土壤基本理化性质、Cd形态和修复剂的各种特性.通过比较不同的土壤性质和钝化效果,两种钝化剂均能有效提高土壤的p H值,水稻土中酸可提取态的Cd含量都有明显降低,随着时间的推移,污染土壤中钝化剂的钝化效应显著增加,钝化效果最好的添加量为3.2%ZHC,采用TCLP提取法,钝化后红壤水稻土中重金属浓度下降了48.9%.By selecting the red paddy soil,taking the chitosan(modified)-zeolite(N-methylene chitosan hypophosphate-zeolite(ZHC),N-methylene chitosan phosphite-zeolite(ZPC))as passivation agent and considering the factors of different processing time and amount of passivator added,the effect of chitosan(modified)-zeolite on passivation of Cd in soil was compared and analyzed.The results showed that pH value of soil could effectively increase by using the both passivants.The content of Cd in acid extractable in paddy soil reduced obviously.The passivating effect of passivating agent increased significantly with the passage of time.By comparing different types and different doses of passivation agents,the best passivation effect was that the additive amount was 3.2%ZHC.Using toxicity characteristic leaching procedure(TCLP)extraction,the concentration of heavy metals in red paddy soidecreased by 48.9%.

关 键 词：壳聚糖(改性) 沸石 土壤修复 镉 红壤水稻土 BCR提取法 TCLP提取法 

分 类 号：X53[环境科学与工程—环境工程]