Synthesis Hydroxyapatite from Three Types Eggsshells by Co-Precipitation Method

Abstract

In the present work, hydroxyapatite (HAp) were synthesised from three types eggshells (hen eggshells, duck eggsshells and quail eggsshells) by co-precipitation method. By using recycled eggshells, there were calcined at 700-900 °C for 2 h to form calcium carbonate (CaCO3). Then, CaCO3 and ammonium dihydrogenphosphate (NH4H2PO4) were used as precursor to produce HAp. The molar ratio of Ca to P was 1.67 : 1. In order to determine the most suitable calcination temperature to produce HAp based on purity of CaCO3, HAp were investigated over the temperatures range of 800-1100 °C for 2 h. Phase formation and microstructure evolution of HAp samples were determined by using (XRD), (SEM) and (FTIR) respectively. The results showed that CaCO3 formed at 700 °C for 2 h of all eggshell types. XRD investigations show that HAp powder were stable up to 1100 °C with hexagonal structure. SEMinvestigations demonstrate that the HAp powder obtained with a sphere morphology and FTIR confirmed that the HAp powder calcined at 1100 °C corresponded to the phosphate group in PO43- with significant characteristic peaks at 1026.5 and 563.9 cm-1.