Title: Adsorption of Acid Yellow 99 onto DEDMA-sepiolite from aqueous solutions

Authors: A. Safa Ozcan, Adnan Ozcan

Addresses: Faculty of Science, Department of Chemistry, Anadolu University, 26470 Eskisehir, Turkey. ' Faculty of Science, Department of Chemistry, Anadolu University, 26470 Eskisehir, Turkey

Abstract: The adsorption of Acid Yellow 99 (AY99) onto dodecylethyldimethylammonium (DEDMA)-sepiolite was investigated in aqueous solution in a batch system with respect to pH, contact time and temperature. The surface modification of DEDMA-sepiolite was examined by the FTIR technique. The experimental data fitted very well with the pseudo-second-order kinetic model with the correlation coefficients above 0.985. The Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption isotherm models agree well with experimental data. The Langmuir-isotherm constant (K_L) was used to evaluate the thermodynamic parameters for the adsorption of AY99 onto DEDMA-sepiolite.

Keywords: sepiolite; adsorption; acid dyes; surfactant; kinetics; isotherms; dye removal; DEDMA; kinetic modelling; thermodynamics; wastewater treatment; water pollution; sorption.

DOI: 10.1504/IJEP.2008.020800

International Journal of Environment and Pollution, 2008 Vol.34 No.1/2/3/4, pp.308 - 324

Published online: 16 Oct 2008 *

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