Study on Structural Characters of Nano-sized Hydroxyapatite Prepared from Limestone

In recent years, hydroxyapatite nanoparticles have exhibited excellent characters especially related to biomedical applications. Therefore, it is important to conduct the synthesis route development in simple and inexpensive ways. This work aimed to study the structural and optical characters of the hydroxyapatite nanoparticles prepared by precipitation route from natural limestone. The characterization results presented that the sample formed a pure hydroxyapatite with the hexagonal structure and sized in nanometric scale with the respective primary and secondary particles of 5 nm and 29 nm. The vibrational investigation exhibited that the prepared sample had functional groups of the hydroxyapatite originating from phosphate, carbonate, and hydroxyl. Furthermore, the hydroxyapatite had an optical bandgap of 3.38 eV.