Removal of Cr (VI) from aqueous solution using new adsorbent starting from the Moroccan oil shale of Timahdit (layer Y) by a chemical activation with sulfuric acid H2SO4 under different experimental conditions was investigated in this study. The effects of agitation time, pH on the removal of Cr (VI) were studied. In order to investigate the adsorption isotherm, two equilibrium models, Langmuir, and Freundlich isotherm models, were analyzed. The effect of solution pH on the adsorption onto this adsorbent was studied in the pH range 2.1-7.89. Adsorption of Cr (VI) is highly pH dependent and the results indicate that the optimum pH for the removal was found to be 2.1 for this adsorbent.