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E-Journal of Chemistry
Volume 5, Issue 4, Pages 666-678
http://dx.doi.org/10.1155/2008/109398

Adsorption of Cr(VI) onto Activated Carbons Prepared from Indigenous Materials

G. Karthikeyan and S. Siva Ilango

Department of Chemistry, Gandhigram Rural University, Gandhigram-624 302, Tamilnadu, India

Received 22 December 2007; Accepted 20 February 2008

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

The adsorption of chromium(VI) on activated carbons prepared from low cost materials has been studied by batch process. The influences of various parameters like contact time, dosage, pH, pHzpc and co-ions were experimentally verified. The adsorption of Cr(VI) is maximum at strongly acidic medium (pH 3). Adsorption is explained using Langmuir and Freundlich isotherms with help of chi-square analysis. Thermodynamic parameters like ΔG°, ΔH° and ΔS° were calculated to understand the nature of adsorption. The surface morphology of the three activated carbons before and after metal sorption was verified using scanning electron microscope (SEM) and X-ray diffraction studies (XRD).