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E-Journal of Chemistry
Volume 9, Issue 1, Pages 137-144

Kinetic, Thermodynamic and Equilibrium Studies on Uptake of Rhodamine B onto ZnCl2 Activated Low Cost Carbon

N. Bhadusha1 and T. Ananthabaskaran2

1Department of Chemistry, Government Arts College, Salem-7, India
2Department of Chemistry (DDE), Annamalai University, India

Received 7 June 2011; Accepted 12 August 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A carbonaceous adsorbent prepared from biomass waste like wood apple outer shell (Limonia acidissima) by ZnCl2 treatment was investigated for its efficiency in removing Rhodamine B (RDB). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 46.7 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm model and pseudo second order kinetic model. Desorption studies showed that ion exchange mechanism might be involved in the adsorption process.