Adsorption of a cationic dye (methylene blue) onto spent activated clay

被引：245

作者：

Weng, Chih-Huang ^{[1
]}

Pan, Yi-Fong ^{[1
]}

机构：

[1] Dept Civil & Ecol Engn, Kaohsiung 84008, Taiwan

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2007年 / 144卷 / 1-2期

关键词：

adsorption; dye; spent activated clay; methylene blue;

D O I：

10.1016/j.jhazmat.2006.09.097

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The adsorption characteristics of methylene blue (MB) onto spent activated clay (SAC), a waste produced from an edible oil manufacturer was investigated. Results showed that the adsorption increased with increasing MB concentration, temperature, and pH. The adsorption equilibrium data was well fitted by multilayer adsorption isotherm. The maximum adsorption capacities for MB ranged from 0.94 x 10(-4) to 3.41 x 10(-4) mol/g between 5 and 45 degrees C. Thermodynamic parameters suggest that the adsorption is spontaneous and endothermic. We proposed a modified double exponential equation accounting both with chemical and mathematical point of view to describe the adsorption kinetic data. The increases of mass transfer and adsorption capacity were mainly. attributed to the interlayer of the SAC expanding at higher temperature. An activation energy of 13.5 kcal/K mol was determined suggesting that the adsorption involved a chemical reaction mechanism. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：355 / 362

页数：8

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