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Characterization of natural- and organobentonite by XRD, SEM, FT-IR and thermal analysis techniques and its adsorption behaviour in aqueous solutions

Published online by Cambridge University Press:  09 July 2018

G. A. Ikhtiyarova ,
A. S. Özcan ,
Ö. Gök  and
A. Özcan
G. A. Ikhtiyarova
Affiliation:
Department of General Chemistry, Faculty of Natural Science, Bukhara State University, 705017 Bukhara, Uzbekistan
A. S. Özcan
Affiliation:
Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskisşehir, Turkey
Ö. Gök
Affiliation:
Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskisşehir, Turkey
A. Özcan*
Affiliation:
Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskisşehir, Turkey
*
*E-mail: aozcan@anadolu.edu.tr
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Abstract

In this study, natural bentonite was modified with hexadecyltrimethylammonium (HDTMA) bromide to obtain organobentonite (HDTMA-bentonite). Bentonite and HDTMA-bentonite were then characterized using XRD, XRF, SEM, FT-IR, thermogravimetric (TG) analysis, elemental analysis and Brunauer-Emmett-Teller (BET) surface area techniques. The HDTMA+ cation was found to be located on the surface and enters the interlayer spaces of smectite according to the XRD and SEM results. FT-IR spectra indicated the existence of HDTMA functional groups on the bentonite surface. The BET surface area significantly decreased after the modification due to the coverage of the pores of natural bentonite. After the characterization, the adsorption of a textile dye, Reactive Blue 19 (RB19), onto bentonite and HDTMA-bentonite was investigated. The maximum adsorption capacity of HDTMA-bentonite for RB19 was 502 mg g-1 at 20°C. The adsorption process followed a pseudo-second-order kinetic model and it was exothermic and physical in nature.

Keywords

bentoniteorganobentonitemodificationcharacterizationadsorptionreactive dye
Type
Research Article
Information
Clay Minerals , Volume 47 , Issue 1 , March 2012 , pp. 31 - 44
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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