"EQUILIBRIUM AND THERMODYNAMIC STUDIES FOR DYE REMOVAL USING PLANT LEAVES (CEIBA PENTANDRA) AS SORBEBNT"

Authors

Dr. CH. A. I. Raju, Assistant Professor, J. Anitha, Research Scholar
Department of Chemical Engineering, Andhra University, Visakhapatnam – 530 003, AP, INDIA

Abstract

The efficacy of Ceiba Pentandra (CP) prepared from plant waste materials was investigated in this study as a novel sorbent for the elimination of dye molecules. The influence of variables including pH, concentration of the dye and amount of sorbent, particle size, contact time and temperature on the dye removal has been investigated. The kinetic models were used to describe the decolorization process. Three isotherm models were applied to evaluate the decolorization equilibrium, and its thermodynamic parameters were calculated. More than 40% removal efficiency was obtained within 30 min at adsorbent dose of 1.5 g per 50 mL for initial dye concentration of 100 mg L−1. The maximum decolorization capacity was found to be at pH 5 and at 303 K. The decolorization kinetic data were found to be in accordance with pseudo-first order kinetics. Calculations of various thermodynamic parameters indicate the endothermic and spontaneous nature of the decolorization process.