【摘要】 通过等温吸附试验,研究了粘土矿物膨润土和沸石对Cd²⁺的吸附状况,并与土壤对Cd²⁺的吸附状况进行了对比。结果表明:随溶液中Cd²⁺浓度的增大,膨润土、沸石和土壤对Cd²⁺的吸附量增大,对Cd²⁺的吸附率随Cd²⁺浓度的增大而降低,其中膨润土的降低的较慢,沸石次之,土壤的降低最快。膨润土、沸石和土壤对Cd²⁺的吸附等温曲线符合Langmuir方程,三者对Cd²⁺的最大吸附量膨润土>沸石>土壤。粘土矿物膨润土和沸石对Cd²⁺有很好的吸附作用,可用于重金属污染土壤的治理。更多还原

【Abstract】 The adsorption cadmium ions of bentonite and zeolite of clay minerals was studied by isothermal adsorption test,and eompared with that of soil.The results showed that,the adsorption of bentonite,zeolite and soil to Cd²⁺increased with increasing of Cd²⁺in solution,but adsorption rate to Cd²⁺declined,bentonite’s was relatively slow,then is zeolite’s and soil’s was the fastest.Adsorption isothermal of bentonite,zeolite and soil to Cd²⁺correspond with Langmuir equation.The order of adsorption to Cd²⁺was bentonite’s>zeolite’s>soil’s.Clay minerals had a high affinity to cadmium ions and might be used to remedy heavy metals contaminated soil.更多还原