Activated carbon prepared from waste wheat husk was used to remove Ni (II) from aqueous solution by adsorption. Batch adsorption studies were carried out by varying the contact time, initial Ni (II) ion concentration in the aqueous solution, adsorbent dosage, pH and temperature. Maximum adsorption was observed with the pH of 6.0, contact time of 4.0 h, adsorbent dosage of 1.50 g/150 ml and at the temperature of 30°C. It was indicated from the results that the effective removal of Nickel (II) ion was obtained by activating the carbon prepared from wheat husk which was heated to 600 °C.Langmuir and Freundlich isotherms were used to describe the equilibrium nature of Ni (II) adsorption. The adsorption capacity (q_e ) calculated from Langmuir and Freundlich isotherms were found to be 11.83 mg /g and 11.96 mg/g at pH 6.0 at 303 K. The removal of Ni (II) was found to be 80.1% for the initial Ni (II) concentration of 10 mg/l and adsorbent dosage of 0.50g/150ml. In the isotherm studies, the experimental adsorption data fitted well the Freundlich isotherm for the activated carbon from wheat husk. The results of the thermodynamic investigations indicate that the adsorption reactions are spontaneous (G<0), slightly endothermic (H >0) and irreversible (S>0)

KEYWORDS: Nickel (II) removal,Activated carbon, Wheat husk,Adsorption isotherm, Thermodynamics