In this work, the efficiency of a Schiff base derived from ethylenediamine and benzaldehyde in the removal of Cr(VI) and Ni(II) ions from their aqueous solution in batch mode was investigated. The FT-IR spectra of the Schiff base before and after adsorption showed bands at 1640 cm-1 and 1644 cm-1which indicate the formation of C=N functional group and coordination of the metal ions respectively. The Schiff base was found to be insoluble in water. SEM results of the Schiff base before and after adsorption revealed different morphology. Adsorption parameters were studied at equilibrium time of 80 min and 60 min for Cr(VI) and Ni(II) respectively. The optimum pH value for the adsorption of Cr(VI) and Ni(II) was 4 and 8 respectively. The thermodynamic parameters such as change in Gibbs free energy ((G), enthalpy ((H) and entropy ((S) were calculated at different temperatures. The values of Gibbs free energy were found to be negative, which that the adsorption process was spontaneous and feasible. The heat for adsorption of Cr(VI) and Ni(II) ions were 80928 J/mol and 47248 J/mol respectively, and this indicates the removal of Cr(VI) and Ni(II) is through chemisorption and endothermic. Furthermore, entropy values 277 J/molK-1 for Cr and 168 J/molK-1 revealed the spontaneity of the process
