铁铝柱撑蒙脱土对典型土壤重金属的稳定化  

Stabilization of typical soil heavy metals using Fe-Al pillared-supported montmorillonite

作　　者：李惠民 樊艳春 梅子奇 文琛 杨秀琼 易芳 赵刚 LI Huimin;FAN Yanchun;MEI Ziqi;WEN Chen;YANG Xiuqiong;YI Fang;ZHAO Gang(Jiangxi Provincial Key Laboratory of Environmental Pollution Control,Jiangxi Academy of Eco-Environmental Sciences and Planning,Nanchang 330000,China;Jiangxi Ecological Environment Monitoring Center,Nanchang 330006,China)

机构地区：[1]江西省生态环境科学研究与规划院环境污染防治江西省重点实验室,江西南昌330000 [2]江西省生态环境监测中心,江西南昌330006

出　　处：《南昌大学学报(工科版)》2025年第1期25-30,共6页Journal of Nanchang University(Engineering & Technology)

基　　金：国家重点研发计划项目(2022YFD1700800);江西省重大科技研发专项(20194ABC28010)。

摘　　要：利用钠基蒙脱土分别制得了羟基铁、羟基铝、羟基铁铝柱撑蒙脱土。X射线衍射、红外光谱、扫描电镜测试表征结果表明铁铝柱撑改性没有破坏蒙脱土原有层状结构,但蒙脱土表面形貌发生较大变化,改性后材料层间距增大,柱撑结构的红外特征峰明显。浸出毒性浸出方法实验分析结果显示铁铝柱撑改性蒙脱土的添加对土壤中Ni^(2+)、Cr^(6+)、Cu^(2+)的稳定化效果较高。针对污染质量分数为0.40 g/kg的Ni^(2+)、Cr^(6+)、Cu^(2+)混合污染土壤,改性蒙脱土的最佳投加量为0.40 g/g时,土壤中Ni^(2+)、Cr^(6+)、Cu^(2+)的稳定化效率最高可以分别达到53.2%、99.2%、43.0%。Sodium-based montmorillonite was used to produce hydroxyferric,hydroxyaluminium and hydroxyferroaluminium pillar-supported montmorillonite,respectively.The results of X-ray diffraction,infrared spectroscopy and scanning electron microscopy showed that the modification of Fe-Al pillar-supported montmorillonite did not destroy the original layered structure of montmorillonite,but the surface morphology of the montmorillonite changed considerably,and the spacing of the layers of the modified material increased,and the infrared characteristic peaks of the pillar-supported structure were obvious.The results of toxicity characteristic leaching procedure analysis showed a better stabilization efficiency of Fe-Al pillar-supported modification for Cu^(2+),Ni^(2+),Cr^(6+)in soil.The optimum dosage of modified montmorillonite was 0.40 g/g for the mixed Ni^(2+),Cr^(6+)and Cu^(2+)contaminated soil with a pollution concentration of 0.40 g/kg,and the stabilization efficiencies of Ni^(2+),Cr^(6+)and Cu^(2+)in soil could reach up to53.2%,99.2%,and 43.0%,respectively.

关 键 词：土壤重金属 稳定化 蒙脱土 铁铝柱撑蒙脱土 

分 类 号：X53[环境科学与工程—环境工程]