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Adsorption Behaviour of Ni (II) from Water onto Zeolite X: Kinetics and Equilibrium Studies

The optimal parameters affecting the adsorption of nickel ions, Ni (II) on Zeolite X are determined. The adsorption of Ni (II) is strongly dependent on pH, temperature and initial adsorbate concentration. The equilibrium adsorption data follow the Langmuir and the Freundlich isotherms. The maximum adsorption capacity of Zeolite X is estimated to be 46mg/g. The optimum pH for Ni (II) removal is found out to be 5.2. The equilibrium data show the endothermic nature of adsorption. The thermodynamic parameters are obtained from the equilibrium data. Kinetics data show that at higher temperatures, the rate of adsorption is higher for Zeolite X. Kinetics studies show that Lagergren, and second order equations successfully describe the adsorption process.