International Journal of Chemical Studies
Vol. 1, Issue 3 (2013)
Adsorption of Lead, Nickel, and Cobalt Ions onto Libyan Bentonite Clay
Author(s): Hamdi. A. M. Bennour
Abstract: In environmental studies it is important to know the adsorption process of heavy metals in clay minerals, since they are able to immobilize these metals. Knowing the cations adsorption is influenced by several factors, the objective of this research was to study the adsorption process of Lead, Nickel, and Cobalt on natural bentonite clay and to evaluate the concentration of metal ions and the influence of pH on this process. In order to quantify the adsorbed (Pb, Ni, and Co), 1 g of bentonite clay, dried at room temperature and sieved at ~200 mesh (74 μ), were equilibrated for 24 hours with 50 mL of water containing different quantities of metal ions (100, 200, 400, 600, 800, and 1000 mg / L) as background solutions of pH values 4.5 and 6.9. Maximum adsorption was obtained at pH 6-6.5. The relationship between the amounts of metal cations adsorbed was found to follow the Freundlich adsorption isotherm. Freundlich’s adsorption equation in its linearized form was applied. The results showed that Freundlich equation was adequate to describe the metal ions adsorption at different pH values and concentrations.
Fig. 1: Freundlich adsorption isotherms for Pb+2 at pH 6.5
Fig. 2: Freundlich adsorption isotherms for Ni+2 at pH 6.5
Pages: 118-128 | 1159 Views 9 Downloads
How to cite this article:
Hamdi. A. M. Bennour. Adsorption of Lead, Nickel, and Cobalt Ions onto Libyan Bentonite Clay. Int J Chem Stud 2013;1(3):118-128.