Removal of Pb2+ and Cd2+ by adsorption on clay-solidified grouting curtain for waste landfills

被引：0
|
作者：
陈永贵 [1 ]
张可能 [2 ]
邹银生 [3 ]
邓飞跃 [4 ]
机构：
[1] School of Bridge and Structural Engineering,Changsha University of Science and Technology,Changsha 410076,China,School of Geoscience and Environmental Engineering,Central South University, Changsha 410083,China,School of Civil Engineering,Hunan University,
来源：
Journal of Central South University | 2006年 / 02期
关键词：
adsorption; clay-solidified grouting curtain; Pb2+; Cd2+; Freundlich model; leachate treatment;
D O I：
暂无
中图分类号：
X53 [土壤污染及其防治];
学科分类号：
082803 ; 120405 ;
摘要：
Pb2+ and Cd2+ in leachate were adsorbed on clay-solidified grouting curtain for waste landfills with equilibrium experiment. The cation exchange capacity was determined with ammonium acetate. And the concentration of heavy metal cations in leachate was determined with atomic absorption spectrophotometer. Their equilibrium isotherms were measured, and the experimental isotherm data were analyzed by using Freundlich and Langmuir models. The results show that the adsorption capacities of the heavy metal cations are closely related to the compositions of clay-solidified grouting curtain, and the maximum adsorption appears at the ratio of cement to clay of 2∶4 in the experimental conditions. At their maximum adsorption and pH 5.0, the adsorption capacities of Pb 2+ and Cd 2+ are 16.19mg/g and 1.21mg/g. The competitive adsorption coefficients indicate that the adsorption of clay-solidified grouting curtain for Pb2+ is stronger than that for Cd 2+ . The adsorption process conforms to Freundlich’s model with related coefficient higher than 0.996.
引用
收藏
页码：166 / 170
页数：5
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