Synthesis and Characterization of Hydroxyapatite from Duck Eggshell by Wet Precipitation Process

Abstract

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely used in various medical applications, mainly in orthopedics and dentistry due to its close similarities with the inorganic mineral component of bone and teeth. This study aims to synthesize hydroxyapatite from duck eggshell using the precipitation method. The duck eggshell was calcined, hydrated (slaking) and underwent carbonation to form Precipitated Calcium Carbonate (PCC). Afterwards, (NH4)2HPO4 was added to produce HAp by varying the molar ratio of Ca/P by 1.67, 1.77 and 1.87 and stirring speed by 200, 250, 300rpm under basic condition (pH 10 – 11). The best results were obtained at a molar ratio of 1.77 with 200rpm stirring speed. Furthermore, the X-ray Diffraction (XRD) analysis showed that its crystals were hexagonal with sizes of 23.062nm, in the absence of other crystalline phases. Therefore, the hydroxyapatite was obtained in the agglomerates form with a specific surface area of ??55.929m2/g.

Evaluating synthesis of Novel Hydroxyapatite from Egg Shell Compared with Chemically Synthesized HAP for Orthopedic application

“…Synthesis of Novel Hydroxyapatite chemically is a time consuming process and it is cost effective. For synthesis of HAP, the pH of the solution was maintained at 11 in order to get only monophasic nano HAP (Azis et al 2021). A milky suspension was obtained which was then filtered and this filtrate washed with ethanol and finally with distilled water several times in order to remove contaminated ions and surfactant (Toibah et al 2019).…”