Removal of dyes from aqueous solution using fly ash and red mud

Wang, S.B., Boyjoo, Y., Choueib, A. and Zhu, Z.H. (2005) Removal of dyes from aqueous solution using fly ash and red mud. Water Research, 39 1: 129-138. doi:10.1016/j.watres.2004.09.011

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Author Wang, S.B.
Boyjoo, Y.
Choueib, A.
Zhu, Z.H.
Title Removal of dyes from aqueous solution using fly ash and red mud
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.watres.2004.09.011
Volume 39
Issue 1
Start page 129
End page 138
Total pages 10
Place of publication London, United Kingdom
Publisher I W A Publishing
Language eng
Abstract Fly ash and red mud have been employed as adsorbents for the removal of a typical basic dye, methylene blue, from aqueous solution. Heat treatment and chemical treatment have also been applied to the as-received fly ash and red mud samples. It is found that fly ash generally shows higher adsorption capacity than red mud. The raw fly ash and red mud show adsorption capacity at 1.4 x 10(-5) and 7.8 x 10(-6) mol/g, respectively. Heat treatment reduces the adsorption capacity for both fly ash and red mud but acid treatment by HNO3 induces a different effect on fly ash and red mud. Nitric acid treatment results in an increase in adsorption capacity of fly ash (2.4 x 10(-5) mol/g) while it decreases the adsorption capacity for red mud (3.2 x 10(-6) mol/g). The adsorption data have been analysed using Langmuir, Freundlich and Redlich-Peterson isotherms. The results indicate that the Redlich-Peterson model provides the best correlation of the experimental data. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. For fly ash and red mud, adsorption of methylene blue is endothermic reaction with DeltaH(0) at 76.1 and 10.8 kJ/mol, respectively. (C) 2004 Elsevier Ltd. All rights reserved.
Keyword Adsorption
Basic dyes
Fly ash
Red mud
Q-Index Code C1
Additional Notes Available online 22 October 2004.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Created: Wed, 17 Oct 2007, 13:23:22 EST