蛭石在重金属离子废水处理中的应用

蛭石是黏土矿物的一种,具有较大的比表面积和较强的阳离子交换容量,能有效去除废水中的重金属。文章总结了近年来蛭石吸附Cu2+、Cd2+、Ni2+、Pb2+等重金属离子的研究状况,发现其去除重金属离子的机理主要是离子交换和表面络合作用。分析了溶液pH值、吸附时间、蛭石粒径、蛭石投加量、溶液浓度对吸附效果的影响。指出应进一步加深对蛭石吸附机理和吸附后处置技术的研究,以及蛭石在实际工程上的应用推广。

Application of vermiculite in treatment of heavy metal ion-containing wastewater

Vermiculite is a kind of clay mineral which has big specific surface area and strong cation exchange capacity and can effectively remove heavy metal ions from wastewater.The research status on vermiculite adsorbing heavy metal ions such as Cu2+, Cd2+, Ni2+, Pb2+ and so on were summarized, it was found that, the main mechanism of vermiculite removing heavy metal ions were ion exchange and surface complexation.The influences of solution pH value, adsorption time, granular diameter and dosage of vermiculite, solution concentration on the adsorption effect were analyzed.It was pointed out that, it should deepen the study of the vermiculite adsorption mechanism and the disposal technology after the adsorption, and promote the application of vermiculite in actual projects.