Adsorption of basic dye from aqueous solution onto fly ash

被引：161

作者：

Lin, J. X. ^{[1
,2
]}

Zhan, S. L. ^{[1
]}

Fang, M. H. ^{[1
]}

Qian, X. Q. ^{[1
]}

Yang, H. ^{[2
]}

机构：

[1] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Coll Mat & Chem Engn, Hangzhou 310027, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2008年 / 87卷 / 01期

关键词：

fly ash; methylene blue; adsorption; wastewater; kinetics model;

D O I：

10.1016/j.jenvman.2007.01.001

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The fly ash treated by H2SO4 was used as a low-cost adsorbent for the removal of a typical dye, methylene blue, from aqueous solution. An increase in the specific surface area and dye-adsorption capacity was observed after the acid treatment. The adsorption isotherm and kinetics of the treated fly ash were studied. The experimental results were fitted using Langmuir and Freundlich isotherms. It shows that the Freundlich isotherm is better in describing the adsorption process. Two kinetic models, pseudo-first order and pseudo-second order, were employed to analyze the kinetic data. It was found that the pseudo-second-order model is the better choice to describe the adsorption behavior. The thermodynamic study reveals that the enthalpy (Delta H-0) value is positive (5.63 kJ/mol), suggesting an endothermic nature of the adsorption. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：193 / 200

页数：8

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