Abstract
The hydroxyapatite nanoparticles were synthesized and used for adsorption of cadmium ions from its aqueous solution. The experiment for adsorption of cadmium ions from its aqueous solutions were carried out at room temperature and initial concentration of cadmium ions as well as after adsorption were determined by UV-Visible spectrophotometer. The effects of solution initial concentration, and temperature were studied in batch experiments. The experimental results were fitted to the Langmuir and Freundlich model to obtain the characteristic parameters of each model. The equilibrium process was described well by the Langmuir isotherm model. The enthalpy of adsorption was endothermic and the increase in cadmium ions uptake with rise in temperature. The initial uptake was rapid and equilibrium was established in less than 200 min. The maximum cadmium ions adsorbed was found to be 61.72 mg/g.
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