Hydroxyapatite Synthesis Using Chicken Eggshell as Calcium Precursor (original) (raw)

This work describes the synthesis of hydroxyapatite from calcium carbonate from organic materials such as eggshells. In the performed synthesis, the biological origin of calcium carbonate was used as the precursor and, through a precipitation reaction with phosphoric acid, was converted into calcium hydroxide. Sequentially, the precipitate was aged, filtered, washed, dried and calcined, and then transformed into hydroxyapatite. The characterization of the produced powders has been performed by XRD (X-ray diffraction), BET (Brunauer, Emmett, Teller) adsorption isotherm and SEM (scanning electron microscopy). The XRD technique has determined the presence of a hydroxyapatite calcium phosphate phase and SEM has revealed a morphology of finely divided particles. The BET method has allowed the calculation of the specific area and volume of micropores, which were consistent with the literature. The results of the characterizations have proved that it is feasible to use organic materials for obtaining hydroxyapatite with the performed reactions.

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