The adsorption of Cu(II) ions on bentonite - a kinetic study

被引：106
|
作者：
Al-Qunaibit, MH
Mekhemer, WK
Zaghloul, AA
机构：
[1] King Saud Univ, Coll Sci, Dept Chem, Women Student Med Studies Sect, Riyadh 11495, Saudi Arabia
[2] King Saud Univ, Coll Sci, Dept Chem, Women Student Sci Sect, Riyadh 11495, Saudi Arabia
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2005年 / 283卷 / 02期
关键词：
bentonite; sorption; kinetics; desorption; Cu2+ ions;
D O I：
10.1016/j.jcis.2004.09.022
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：
The kinetics of sorption of Cu2+ on a Saudi clay mineral (bentonite) was investigated at 20 +/- 0.5degreesC using different weights of the clay (0.5, 1.0, 1.5, and 2 g). Each weight represents a certain sample size. The order of the process appeared to be 1 with respect to the Cu2+, and 1 1/2 with respect to the clay surface area. The rate was found to depend on internal diffusion., which produced a decrease in the specific rate of sorption as a function of time. Sorption characteristics were described using two site Langmuir isotherms. The desorption experiments proved that Cu2+ ions are chemisorbed on the bentonite surface. The maximum adsorption obtained was 909 mg Cu2+/g clay. This value is of great significance, as it is much higher than any reported one. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码：316 / 321
页数：6
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