About this Journal Submit a Manuscript Table of Contents
Advances in Physical Chemistry
Volume 2013 (2013), Article ID 842425, 6 pages
http://dx.doi.org/10.1155/2013/842425
Research Article

Sorption of from Aqueous Solution unto Modified Rice Husk: Isotherms Studies

1Department of Chemistry, Landmark University, P M B 1001, Kwara State, Omu-Aran 370102, Nigeria
2Department of Agricultural and Biosystems Engineering, Landmark University, P M B 1001, Kwara State, Omu-Aran 370102, Nigeria
3Department of Chemical Engineering, Landmark University, P M B 1001, Kwara State, Omu-Aran 370102, Nigeria

Received 23 November 2012; Revised 3 February 2013; Accepted 12 February 2013

Academic Editor: Leonardo Palmisano

Copyright © 2013 A. O. Dada et al. 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

Investigation of the sorption potential of rice husk, an agricultural waste, as an adsorbent was carried out. The rice husk was modified with orthophosphoric acid and was used for adsorption of lead (II) ions (Pb2+) from aqueous solution. Physicochemical properties of the modified rice husk were determined. Equilibrium sorption data were confirmed with Langmuir, Freundlich and Temkin adsorption isotherms. On the basis of adsorption isotherm graphs, values were determined to be 0.995, 0.916, and 0.797 for Langmuir, Temkin, and Freundlich isotherms, respectively, indicating that the data fitted well into the adsorption isotherms, but Langmuir isotherm is a better model. The maximum monolayer coverage from Langmuir studies,  mg/g, Langmuir isotherm constant,  L/mg, and the separation factor, at 100 mg/L of lead(II) ions indicating that the sorption process, was favourable. The suitability of modified rice husk as an adsorbent for the removal of lead ions from aqueous solution and its potential for pollution control is established.