Adsorption of acid dyes from aqueous solutions onto acid-activated bentonite

被引:572
作者
Özcan, AS [1 ]
Özcan, A [1 ]
机构
[1] Anadolu Univ, Fac Sci, Dept Chem, TR-26470 Eskisehir, Turkey
关键词
adsorption; acid dyes; kinetics; clays; activated bentonite;
D O I
10.1016/j.jcis.2004.03.043
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 two dyes, namely, Acid Red 57 (AR57) and Acid Blue 294 (AB294), onto acid-activated bentonite in aqueous solution was studied in a batch system with respect to contact time, pH, and temperature. Acidic pH was favorable for the adsorption of these dyes. The surface characterization of acid-activated bentonite was performed using the FTIR technique. The pseudo-first-order and pseudo-second-order kinetic models and the intraparticle diffusion model were used to describe the kinetic data and the rate constants were evaluated. The dynamic data fitted the pseudo-second-order kinetic model well and also followed the intraparticle diffusion model up to 90 min, but diffusion is not the only rate controlling step. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms and the isotherm constants were determined. The Freundlich model agrees very well with experimental data. The activation energies of adsorption were also evaluated for the adsorption of AR57 and AB294 onto activated bentonite. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:39 / 46
页数:8
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