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E-Journal of Chemistry
Volume 6, Issue 3, Pages 693-704
http://dx.doi.org/10.1155/2009/587159

Comparative Study on Adsorption of Mn(II) from Aqueous Solutions on Various Activated Carbons

K. A. Emmanuel1 and A. Veerabhadra Rao2

1Department of Chemistry, Sir C. R. R. Autonomous College, Eluru, West Godavari, District Andhra Pradesh, India
2Department of Physics, Sir C. R. R. Autonomous College, Eluru, West Godavari, District Andhra Pradesh, India

Received 23 September 2008; Revised 20 November 2008; Accepted 1 December 2008

Copyright © 2009 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 Mn(II) on indigenously prepared activated carbons (IPAC) from Bombax malabaricum, Pithecelobium dulse, Ipomea batatas and Peltaforum ferraginium have been studied. The effects of various experimental parameters have been investigated using batch adsorption technique. The extent of Mn(II) removal increased with decrease in initial concentration of the Mn(II), particle size of the adsorbent and increased with increase in contact time, amount of adsorbent used and the initial pH of the solution. Adsorption data were modeled using Freundlich and Langmuir adsorption isotherms and first order kinetic equations. The kinetics of adsorption was found to be first order with regard to intra-particle diffusion rate. The results indicate that such carbons could be employed as low cost adsorbents in waste water treatment for the removal of Mn(II).