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E-Journal of Chemistry
Volume 8, Issue 1, Pages 185-195
http://dx.doi.org/10.1155/2011/606850

Kinetics of Adsorption of Ferrous Ion onto Acid Activated Carbon from Zea Mays Dust

P. K. Baskaran,1 B. R. Venkatraman,2 and S. Arivoli3

1Department of Chemistry Government Arts College, Dharmapuri-636705, India
2P.G & Research Department of Chemistry, Periyar E V R College (Autonomous), Thiruchirapalli-620 023, India
3Department of Chemistry Thiru. Vi. Ka. Government College, Thiruvarur-610003, India

Received 6 June 2010; Revised 18 August 2010; Accepted 1 September 2010

Copyright © 2011 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 batch removal of ferrous ion from aqueous solution using low cost adsorbents such as zea mays dust carbon(ZDC) under different experimental conditions were investigated in this study. The process parameters studied include agitation time, initial metal ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to 37.17, 38.31, 39.37 and 40.48 mg/g. The temperature variation study showed that the ferrous ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the ferrous ion solutions. The Langmuir and Freundlich adsorption isotherms obtained positive ΔH0 value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of ferrous ion on ZDC involves physisorption mechanism.