Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

被引：43

作者：

Li, Wei ^{[1
]}

Zhang, Shuzhen ^{[1
]}

Shan, Xiao-quan ^{[1
]}

机构：

[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 293卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

phosphate; goethite; modification; adsorption; copper; cadmium;

D O I：

10.1016/j.colsurfa.2006.07.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

In order to understand the role of phosphate in the reactions of heavy metals on mineral surfaces, phosphate was used to modify goethite and then adsorption of copper and cadmium on the pristine and phosphate-modified goethite was investigated. Compared with the pristine goethite, the phosphate-modified goethite had a higher adsorption capacity and a faster adsorption rate. Surface characteristics, such as specific surface area, pore size distribution, zeta potential and surface charges, were then systematically investigated in order to examine the relevant mechanism for the enhancement of copper and cadmium adsorption onto the phosphate-modified goethite. It was found that the decreased surface charge contributed most to the higher adsorption capacity and the enlarged average pore size was mainly responsible for the fast adsorption kinetics, while there was no direct link between specific surface area and the adsorption capacity. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：13 / 19

页数：7

共 32 条

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Adsorption of some heavy metal ions on sulfate- and phosphate-modified kaolin [J].