Table of Contents
Indian Journal of Materials Science
Volume 2013 (2013), Article ID 248138, 6 pages
http://dx.doi.org/10.1155/2013/248138
Research Article

The Sorption of Ni(II) by Grape Shell Ash from Aqueous Solution: Kinetic and Thermodynamic Studies

Department of Chemistry, Sciences Faculty, Islamic Azad University, Arak Branch, P.O. Box 38135-567, Arak, Iran

Received 20 July 2013; Accepted 24 August 2013

Academic Editors: W. Cantwell and J. M. Deitzel

Copyright © 2013 Nahid Ghasemi 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

The sorption of Ni(II) onto grape shell ash (GSA) was studied by performing batch kinetic sorption experiments. The influences of major parameters in Nickel(II) ions sorption on GS such as initial of pH, initial concentration of Ni(II) ions, the initial temperatures of solution, and contact time were investigated. The maximum increase in the rate of sorption of Ni(II) ions on GS was observed at an initial pH = 5, initial concentration of nickel 50 mgL−1, temperature of solution (328 K), and  min. The rate constants and the equilibrium sorption capacities were calculated. The results indicate that the sorption process follows the second-order kinetics and the values of rate constants were found to be 0.224, 0.402, 0.193 and 0.123 min−1 at 298, 308, 318, and 328 K, respectively. The values of correlation coefficients for the adsorption of Ni(II) on GSA from all the systems were found to be 0.999, and the values of predicted equilibrium sorption capacities showed good agreement with the experimental equilibrium uptake values. The thermodynamic parameters (, , and ) of the adsorption process were calculated, and these parameters showed that the adsorption process is spontaneous.