A. Maximova, B. Koumanova Journal of the University of Chemical Technology and Metallurgy, 43, 1, 2008, 101-108
EQUILIBRIUM AND KINETICS STUDY OF ADSORPTION OF BASIC DYES ONTO PERFIL FROM AQUEOUS SOLUTIONS
A. Maximova, B. Koumanova
University of Chemical Technology and Metallurgy 8 Kl. Ohridski, 1756 Sofia, Bulgaria E-mail: bogdana@uctm.edu
Received 05 May 2007 Accepted 12 December 2007
ABSTRACT Adsorption of two basic dyes, Basic Red 18 and Basic Blue 5, onto two fractions, Perfil M-100 and Perfil M-150, has been investigated. The effect of initial concentrations, mass of adsorbent and agitation speed to assess the possibility of using perfil for removing cationic dyes from aqueous solutions has been evaluated. The equilibrium sorption isotherms have been analyzed by Langmuir, Freundlich and Redlich-Peterson models. The experimental data were correlated reasonably well by the Langmuir and Redlich-Peterson isotherms for Basic Blue 5 and by the Freundlich model - for Basic Red 18. The adsorption capacity of two sorbents for Basic Red 18 follows the order Perfil M-100 > Perfil M-150 and for Basic Blue 5 it was Perfil M-150 > Perfil M-100. The kinetics models of the sorption were analyzed using pseudo-first order and pseudo-second order kinetic models. The data showed that the second-order kinetic model was more appropriate for both studied dyes. Keywords: sorption, basic dyes, equilibrium isotherms, kinetics.
INTRODUCTION Colour removal from textile effluents has been the subject of great attention not only because of its toxicity but mainly due to its visibility [1]. Through hundreds of years, the scale of production and the nature of dyes have changed drastically, consequently the negative impact of dyes on the environment has increased [2]. Adsorption processes which produce good quality effluents that are low in concentration of dissolved organic compounds, such as dyes [3, 4], are rapidly gaining importance as treatment processes [5]. Activated carbon is the most effective and widely used adsorbent for wastewater treatment [6] but it is expensive. Consequently, new materials, such as chitin, [7] silica gel [8] wood [9], natural materials [10-15], bagasse

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