摘要
通过等温吸附试验,研究了粘土矿物膨润土和沸石对Cd^(2+)的吸附状况,并与土壤对Cd^(2+)的吸附状况进行了对比。结果表明:随溶液中Cd^(2+)浓度的增大,膨润土、沸石和土壤对Cd^(2+)的吸附量增大,对Cd^(2+)的吸附率随Cd^(2+)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Cd^(2+)的吸附等温曲线符合Langmuir方程,三者对Cd^(2+)的最大吸附量膨润土>沸石>土壤。粘土矿物膨润土和沸石对Cd^(2+)有很好的吸附作用,可用于重金属污染土壤的治理。
The adsorption cadmium ions of bentonite and zeolite of clay minerals was studied by isothermal adsorption test, and compared with that of soil. The results showed that, the adsorption of bentonite, zeolite and soil to Cd^2＋ increased with increasing of Cd^2＋ in solution, but adsorption rate to Cd^2＋ declined, bentonite＇s was relatively slow, then is zeolite＇s and soil＇s was the fastest. Adsorption isothermal of bentonite, zeolite and soil to Cd^2＋ correspond with Langmuir equation. The order of adaorption to Cd^2＋ 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.
出处
《山西农业大学学报（自然科学版）》
CAS
2009年第2期97-99,103,共4页
Journal of Shanxi Agricultural University(Natural Science Edition)
关键词
膨润土
沸石
吸附
Bentonite
Zeolite
Adsorption
