Abstract—In this research, the Acacia tortilis leaves was utilized as an adsorbent material for the removal of lead ions from aqueous solution. Batch experiments were used to predict the adsorption capacity of lead ions onto Acacia tortilis leaves. Different parameters affecting the adsorption process were tested including initial pH of adsorbate, adsorbent dose, contact time and contact temperature. Three kinetic models, including first order, pseudo-second order and intra-particle diffusion were used to analyze the adsorption process. The adsorption process was investigated using Langmuir and Freundlich isotherm models. The maxima adsorption capacities were 704.8, 632.3, 437 and 332 at 303, 313, 323 and 323 K, respectively. Thermodynamic parameters such as gibbs free energy, enthalpy and entropy were calculated to predict the nature of the adsorption. Langmuir and Freundlich models were applied to describe the adsorption isotherm.

Index Terms—Lead ions, adsorption, acacia tortilis, langmuir isotherm, thermodynamic parameters.

M. A. Ackacha is with Chemistry Department, Faculty of Science, Sebha University, Libya (e-mail: ackacha57@yahoo.com).
L. A. Elsharif is a chemist with the Secondary school, Samno, Sebha, Libya.

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Cite: M. A. Ackacha and L. A. Elsharif, "Adsorption Removal of Lead Ions by Acacia Tortilis Leaves: Equilibrium, Kinetics and Thermodynamics," International Journal of Environmental Science and Development vol. 3, no. 6, pp. 584-589, 2012.