Adsorption of some heavy metal ions on sulfate- and phosphate-modified kaolin

被引：117

作者：

Adebowale, KO ^{[1
]}

Unuabonah, IE ^{[1
]}

Olu-Owolabi, BI ^{[1
]}

机构：

[1] Univ Ibadan, Dept Chem, Ibadan, Nigeria

来源：

APPLIED CLAY SCIENCE | 2005年 / 29卷 / 02期

关键词：

kaolin; heavy metal ions; adsorption;

D O I：

10.1016/j.clay.2004.10.003

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 ; 081704 ;

摘要：

Kaolin (bright white lumps) from Ubulu-Ukwu in Delta State of Nigeria was modified with 200 mu g mL(-1) of phosphate and sulphate anions to give phosphate- and sulfate-modified adsorbents, respectively. The adsorption of four metal ions (Pb2+, Cd2+ Zn2+, and Cu2+) was studied as a function of metal ions concentration. The metal ions showed stronger affinity for the phosphate-modified adsorbent with Pb2+, Cu2+, Zn2+, and Cd2+ giving an average of 93.28%, 80.94%, 68.99%, and 61.44% uptake capacity. The order of preference for the various adsorbents shown by the metal ions was as follows: Pb2+> Cu2+> Zn2+> Cd2+ Desorption studies showed that the phosphate-modified adsobent had the highest affinity for the metal ions, followed by the sulfate-modified clay while the unmodified clay had the least affinity. The experimental data were fitted by both the Langmuir and Freundlich models. (c) 2004 Published by Elsevier B.V.

引用

页码：145 / 148

页数：4

共 13 条

[1] ADSORPTION OF LEAD, COPPER, ZINC, COBALT, AND CADMIUM BY SOILS THAT DIFFER IN CATION-EXCHANGE MATERIALS [J].