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The mineralized hydroxyapatite (m-HA) was prepared by soaking natural hydroxyapatite (n-HA) extracted from pig bone in the simulated body fluid (SBF) for 3 days. The m-HA was much better in comparison with the n-HA for removing Pb ions from aqueous solution. After 4 hours of adsorption experiments, m-HA material eliminated almost 100% of lead ions while n-HA removes only 65.4%. The adsorption isotherm study was effectuated for the m-HA. The experimental data was fitted for both Langmuir and Freundlich models in which the Langmuir model was more suitable due to the higher value of R coefficient. The maximum adsorption capacity (Qm) of Pb ions on the m-HA was calculated from the Langmuir isotherm equation, which was the high value of 574.1 (mg/L). The mechanism of lead ion removal for m-HA was determined by XRD analysis. The obtained result highlighted the ion exchange between the m-HA and the Pb ions.

The, Mineralization of natural hydroxyapatite for high efficiency of Pb2+ ion removal in aqueous solution