Adsorption of Pb(II) from aqueous solution to MX-80 bentonite: Effect of pH, ionic strength, foreign ions and temperature

被引：258

作者：

Xu, D. ^{[1
]}

Tan, X. L. ^{[1
]}

Chen, C. L. ^{[1
]}

Wang, X. K. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

来源：

APPLIED CLAY SCIENCE | 2008年 / 41卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Pb(II); adsorption; MX-80; bentonite; pH; ionic strength; temperature;

D O I：

10.1016/j.clay.2007.09.004

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 adsorption of Pb(II) from aqueous solution to MX-80 bentonite was studied using batch technique under ambient conditions. Removal percent (%) and distribution coefficient (K-d) were determined as a function of shaking time, pH, ionic strength and temperature. The results showed that the adsorption behavior of Pb(II) on bentonite was strongly dependent on pH and ionic strength. The presence of complementary cations depressed the adsorption of Pb(II) on bentonite in the order of Li+ approximate to Na+ > K+ at pH 2-5. The adsorption isotherms were simulated by the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) models very well. The thermodynamic parameters (Delta H degrees, Delta S degrees, and Delta G degrees) for the adsorption of Pb(II) were determined at three different temperatures of 291 K, 308 K and 328 K. The adsorption reaction was exothermic and the process of adsorption was favored at low temperature. The results suggest that bentonite is suitable as a sorbent material for the recovery and adsorption of Pb(II) from aqueous solution. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：37 / 46

页数：10

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