The removal of dyes from textile wastewater: a study of the physical characteristics and adsorption mechanisms of diatomaceous earth

被引：574

作者：

Al-Ghouti, MA ^{[1
]}

Khraisheh, MAM ^{[1
]}

Allen, SJ ^{[1
]}

Ahmad, MN ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Chem Engn, Belfast BT9 5AG, Antrim, North Ireland

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2003年 / 69卷 / 03期

关键词：

diatomite; adsorption; methylene blue; reactive dyes;

D O I：

10.1016/j.jenvman.2003.09.005

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The feasibility of using diatomite for the removal of the problematic reactive dyes as well as basic dyes from textile wastewater was investigated. Methylene blue, Cibacron reactive black and reactive yellow dyes were considered. Physical characteristics of diatomite such as pH(solution), pH(ZPC), surface area, Fourier transform infrared, and scanning electron microscopy were investigated. The surface area of diatomite was found to be 27.80 m(2) g(-1) and the pH(ZPC) occurred around pH of 5.4. The results indicated that the surface charge of diatomite decreased as the pH of the solution increased with the maximum methylene blue removal from aqueous solution occurring at basic pH of around (1011). Adsorption isotherms of diatomite with methylene blue, hydrolysed reactive black and yellow dyes were constructed at different pH values, initial dye concentrations and particle sizes. The experimental results were fitted to the Langmuir, Freundlich, and Henry models. The study indicated that electrostatic interactions play an important role in the adsorption of dyes onto diatomite. A model of the adsorption mechanism of methylene blue onto diatomite is proposed. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：229 / 238

页数：10

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