Corncob, which is the main waste from corn agricultures in Egypt, has been used as a raw material for the preparation of different activated carbons. Activated carbons (ACs) were prepared by chemical activation with concentrated H"3PO"4 acid; followed by pyrolysis at 400, 500 and 600^oC. Different ACs have been used for the removal of methylene blue (MB) dye from aqueous solutions. Batch adsorption experiments were performed as a function of initial dye concentration, contact time, adsorbent dose and pH. Adsorption data were modeled using the Langmuir and Freundlich adsorption isotherms. Adsorption of MB on AC1 (R^2=0.9868) and AC2 (R^2=0.9810) followed Langmuir model with maximum monolayer sorption capacity of 28.65 and 17.57mg/g, respectively. Adsorption onto AC3 was better fitted to Freundlich isotherm model (R^2=0.9823).
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