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E-Journal of Chemistry
Volume 5, Issue 2, Pages 224-232
http://dx.doi.org/10.1155/2008/261637

Removal of Phenol and o-Cresol by Adsorption onto Activated Carbon

A. Edwin Vasu

Post Graduate and Research Department of Chemistry, St. Joseph's College (Autonomous), Tiruchirappalli-620 002, Tamil Nadu, India

Received 25 July 2007; Accepted 20 September 2011

Copyright © 2008 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.

Abstract

A commercial activated carbon was utilized for the adsorptive removal of phenol and o-cresol from dilute aqueous solutions. Batch mode adsorption studies were performed by varying parameters such as concentration of phenol solution, time, pH and temperature. The well known Freundlich, Langmuir and Redlich-Peterson isotherm equations were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated. The Langmuir monolayer adsorption capacities were found to be 0.7877 and 0.5936 mmole/g, respectively, for phenol and o-cresol. Kinetic studies performed indicate that the sorption processes can be better represented by the pseudo-second order kinetics. The processes were found to be endothermic and the thermodynamic parameters were evaluated. Desorption studies performed indicate that the sorbed phenol molecules can be desorbed with dil. HCl.