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 CaCO_3, 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 PO₄^3- with significant characteristic peaks at 1026.5 and 563.9 cm^-1.

• Periodical: Applied Mechanics and Materials (Volume 866)
• Pages: 73-76
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.866.73
• Online since: June 2017
• Authors: Thitiyada Taewana*, Rewadee Wongmaneerung
• Keywords: Calcium Carbonate, Eggshell, Hydroxyapatite, Precipitation

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