Enhancement of copper and cadmium adsorption on kaolin by the presence of humic acids

被引：245
作者：
Arias, M
Barral, MT
Mejuto, JC
机构：
[1] Univ Vigo, Fac Ciencias Ourense, Dept Quim Fis, Orense 32004, Spain
[2] Univ Santiago de Compostela, Fac Farm, Dept Edafol & Quim Agr, Santiago De Compostela 15706, Spain
[3] Univ Vigo, Fac Ciencias Ourense, Area Edafol & Quim Agr, Orense 32004, Spain
来源：
CHEMOSPHERE | 2002年 / 48卷 / 10期
关键词：
cadmium; copper; kaolin; HA; adsorption; freundlich;
D O I：
10.1016/S0045-6535(02)00169-8
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The competitive adsorption equilibrium isotherms of Cu2+ and Cd2+ on kaolin have been measured at 298 K, in the presence and the absence of humic acids (HAs). HAs were found to enhance the metal adsorption capacity of mineral surfaces, in particular kaolin. This enhancement was also observed in the competitive adsorption of copper and cadmium on kaolin and kaolin-HA complex. This competitive adsorption shows that the presence of Cd2+ has not an important effect on Cu2+ adsorption, whereas a dramatic decrease is observed on the adsorption of Cd2+ in the presence of Cu2+. The Freundlich isotherm equation was found to provide an excellent fit to the experimental data. These results were compared with the independent adsorption of both heavy metals. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1081 / 1088
页数：8
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