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

被引：30
作者：
Chen Yong-gui [1 ]
Zhang Ke-neng
Zou Yin-sheng
Deng Fei-yue
机构：
[1] Changsha Univ Sci & Technol, Sch Bridge & Struct Engn, Changsha 410076, Peoples R China
[2] Cent S Univ, Sch Geosci & Environm Engn, Changsha 410083, Peoples R China
[3] Hunan Univ, Sch Civil Engn, Changsha 410082, Peoples R China
[4] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China
来源：
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2006年 / 13卷 / 02期
关键词：
adsorption; clay-solidified grouting curtain; Pb2+; Cd2+; Freundlich model; leachate treatment;
D O I：
10.1007/s11771-006-0150-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
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 Ph2+ and Cd2+ are 16.19 mg/g and 1.21 mg/g. The competitive adsorption coefficients indicate that the adsorption of clay-solidified grouting curtain for Ph2+ stronger than that for Cd2+. The adsorption process conforms to Freundlich's model with related coefficient higher than 0.996.
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页码：166 / 170
页数：5
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