Removal of nickel (II)‎ from aqueous solutions by using nano-crystalline calcium hydroxyapatite

Abstract EN

The potential of the synthesized nano-hydroxyapatite to remove Ni2+ from aqueous solutions was investigated in batch reactor under different experimental conditions.

The study also investigates the effects of process parameters such as initial concentration of Ni2+ ion, temperature, and adsorbent mass.

Various thermodynamic parameters, such as AG°, ΔH°and ΔS° have been calculated.

The thermodynamics of Ni2+ ion onto nano-HAp system indicates spontaneous and endo-thermic nature of the process.

Nickel uptake was quantitatively evaluated using the Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich model.

The adsorption data follow the adsorption equilibrium was described well by the Langmuir isotherm model with maximum adsorption capacity of 46.17 mg / g of Ni2+ ions on nano-HAp.