Desorption of cadmium from goethite (alpha-FeOOH)

被引：47

作者：

Davis, AP

Upadhyaya, M

机构：

[1] Environmental Engineering Program, Department of Civil Engineering, University of Maryland, College Park

来源：

WATER RESEARCH | 1996年 / 30卷 / 08期

关键词：

cadmium; goethite; desorption; adsorption;

D O I：

10.1016/0043-1354(96)00076-0

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Factors influencing the desorption behavior of cadmium from goethite in aqueous solution are investigated using batch desorption experiments. Less cadmium was desorbed with increasing pH from 5 to 7. The presence of calcium increased the desorption at high Cd(II) loadings due to competition between cadmium and calcium for goethite surface sites. Limited effects of ionic strength are noted. EDTA at concentrations less than that of total Cd(II) present are found to inhibit cadmium desorption, especially at pH 5. Minimum Cd(II) desorption occurred near a 1:1 EDTA:Cd(II) total concentration ratio. Additions of chloride and NTA also suppress Cd(II) desorption. The inhibited desorption is attributed to re-adsorption of metal-ligand complexes onto the goethite. Copyright (C) 1996 Elsevier Science Ltd.

引用

页码：1894 / 1904

页数：11

共 24 条

[1] THE ADSORPTION OF CU, PB, ZN, AND CD ON GOETHITE FROM MAJOR ION SEA-WATER [J].