Preparation and characterization of nanocrystalline hydroxyapatite from egg shell and K2HPO4 solution

• Published in: Materials letters 2013-04, Vol.97, p.148-150
• Main Authors: Chaudhuri, Biswadeep, Mondal, Bholanath, Modak, D.K., Pramanik, K., Chaudhuri, B.K.
• Format: Article
• Language: English
• Subjects: calcium oxide; egg shell; Egg shells; Fourier transform infrared spectroscopy; Grain size; Hydroxyapatite; Lattice strain; Low cost; Nanocrystals; Nanoparticle; Phosphates; scanning electron microscopy; Shells; soaking; Synthesis; temperature; X-ray diffraction
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2013.01.082

Ca10(PO4)6(OH)2 (or HAP) was prepared from egg shell and dipotassium phosphate (K2HPO4). Appropriate amount of egg shells derived CaO was soaked in K2HPO4 solution (with Ca/P∼1.67) at 37°C for different soaking times (ST) to obtain nanocrystalline HAP which was characterized by XRD, SEM, HRTEM and FTIR studies. Both grain size and pH showed very little decreasing tendency with increasing ST. The lattice strain estimated from the XRD data also showed similar behavior with increasing ST. The present process of low temperature HAP synthesis is simple, low cost and environment friendly for the large scale production of pure HAP. ► Developed a simple and low cost method for the predation of naocrystalline hydroxyapatite (HAP). ► CaO obtained from egg shell when soaked in appropriate K2HPO4 produced HAP nanoparticles. ► Obtained HAP powder is suitable for making composite scaffold with biodegradable polymers.