The new adsorbent was prepared from the Moroccan oil shale of Timahdit (layer Y) by a chemical activation with sulfuric acid H2SO4 for the removal of Pb (II) from dilute aqueous solution. The effect of experimental parameters such as pH and contact time on the adsorption was studied. The obtained data were fitted with the Langmuir and Freundlich equations to describe the equilibrium isotherms. The characteristic parameters for each isotherm have been determined. It was found that pH played a major role in the adsorption process. The maximum adsorption capacity for Pb (II) on Moroccan oil shale of Timahdit calculated from Langmuir isotherm was more than 84.7 mg g-1. The optimum pH range for the removal of Pb (II) was 2.30-7.88. The Langmuir isotherm model was found to best describe the experimental data.
