The kinetic study has been performed with an initial concentration (C0) of congo red or brilliant green solution equal to 150 mg/L.To build the adsorption isotherms, the mixtures were shaken at room temperature for 240 min to reach equilibrium and C0 has been varied from 10 to 500 mg/L. To investigate the effect of pH on the adsorption, the pH of the dye solution was adjusted to 3 with hydrochloric acid (HCl) or to 10 with sodium hydroxide (NaOH).