SORPTION STUDY OF C.I. ACID RED 88 FROM AQUEOUS SOLUTIONS ONTO SAWDUST

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 795-802 pp

ABSTRACT

The present study deals with the decolorization of C.I. Acid Red 88 (AR88) as a model
contaminant from textile industry using sawdust as an adsorbent. The effects of initial
AR88 concentration, adsorbent dosage, pH, contact time and stirring rate were studied
in a batch mode. The variation of pH from 3 to 10 showed no considerable change in
decolorization rate. The desired conditions for decolorization of 84.46% were obtained
to be 20 min of contact time, stirring rate of 400 rpm with 30 g L-1 of adsorbent.
Freundlich, Redlich-Peterson and Langmuir adsorption models were used for the
mathematical description of the equilibrium data and the equilibrium process confirmed
well with all the models attaining correlation coefficients 0.970, 0.969 and 0.958,
respectively.

Keywords: Adsorption; Sawdust; Isotherm; C.I. Acid Red 88; Decolorization