Influence of Natural and Synthetic Calcium Precursor on the Synthesis of Pure Phase Hydroxyapatite
Keywords:
biomaterials, natural waste, co-precipitation method, hydroxyapatiteAbstract
Hydroxyapatite (Ca10(PO4)6(OH)2) was proved as a remarkable material in the application of biomedical research because of its chemical composition similar to the human bone mineral. The formation of phase pure Hydroxyapatite from different sources of calcium precursors are investigated. In our study, the co-precipitation method was carried out using three different calcium precursors like eggshell powder, (white clam & scallop) seashell powder, calcium hydroxide (synthetic) by fixing phosphorus precursor as phosphoric acid (H3PO4) for all three reactions. Synthesizing HAP from different chemical sources in the form of calcium hydroxide (Ca(OH)2) and phosphoric acid (H3PO4) has been achieved. The functional groups and phase formation of synthesized HAP powder were investigated by Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD). XRD results revealed the pure form of Hydroxyapatite without any other impurity peak of Ca(OH)2 and secondary Phases like TCP, Ca2P2O7 etc.,. The surface morphology was investigated by Scanning electron microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS). The SEM results indicated that the powders had agglomerated particles due to the presence of highly alkaline condition and poor water soluble nature of Ca(OH)2, agglomerated particles are formed when compared to natural precursors.
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