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

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 pHsolution, pHZPC, surfa...

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Bibliographic Details
Published inJournal of environmental management Vol. 69; no. 3; p. 229
Main Authors Al-Ghouti, M A, Khraisheh, M A M, Allen, S J, Ahmad, M N
Format Journal Article
LanguageEnglish
Published London Academic Press Ltd 01.11.2003
Subjects
Dyes
Environmental cleanup
Industrial wastes
Water treatment
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Summary: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 pHsolution, pHZPC, surface area, Fourier transform infrared, and scanning electron microscopy were investigated. The surface area of diatomite was found to be 27.80 m2 g-1 and the pHZPC 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 (10-11). 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.
ISSN:0301-4797
1095-8630