功能化磁性海泡石修复重金属污染土壤的研究

Study on Remediation of Heavy Metals Contaminated Soil by Using Functional Magnetic Sepiolite

首先采用盐酸改性增大纯化海泡石原土的比表面积和孔容,然后用化学共沉淀法对其负磁,再用硼氢化物还原法对负磁后的海泡石负载纳米零价铁的工艺技术制备了功能化磁性海泡石.然后利用比表面积孔径测定仪对功能化磁性海泡石的比表面积、孔容及孔径进行了表征,并研究了功能化磁性海泡石对污染土壤中重金属镉、铅、铬的去除修复特性.实验结果表明:功能化磁性海泡石对污染土壤中重金属镉、铅、铬具有良好的去除修复效果,在污染土壤修复工程中具有较大的应用潜力.

Firstly,the specific surface area and pore volume of purified sepiolite were increased by hydrochloric acid modification,and then the modified sepiolite was magnetized by chemical coprecipitation.Secondly,the functional magnetic sepiolite was prepared by the reduction of orohydride on the magnetized sepiolite loaded with nanoscale zero-valent iron.The specific surface area,pore volume and pore size of functionalized magnetic sepiolite were characterized by using a specific surface area pore diameter analyzer.And the removal of cadmium,lead and chromium from contaminated soil by functional magnetic sepiolite were studied.The results show that the functional magnetic sepiolite has a good effect on the removal and remediation of heavy metals cadmium,lead and chromium in contaminated soil,and has a great application potential in the remediation of contaminated soil.