One of the most pollutants of water is organic dyes, which is usually come from industries of textile, leather and paper. In this work, activated carbon is used as adsorbent, which is prepared from the corn-cob (CCAC) to remove the methyl violet (MV) dye from prepared aqueous solutions. The amount of adsorption dyes were investigated by including the effect of different parameters such as, the agented time, initial dye MV concentration (10-50 g.L-1), effect of pH (3,6,8,10 and 12), temperature (288,308,328) K and adsorbent dosage (0.01-0.1g). The percentage of removal of MV by the CCAC is increased significantly with increasing the amount of the adsorbent and the solution pH, and the maximum was at pH 11.5, but its decreased with increasing the temperature and initial concentration of the dye. The two adsorption isotherm models (Langmuir and Freundlich) were used to investigate the interaction between the dye and prepared activated carbon, while the adsorption equilibrium data were best represented by the Freundlich detect the type of adsorption, which implies that the adsorption of textile dye onto the (CCAC) is heterogeneous with multi – layers.