Abstract
Being no more use than fertilizer, eggshells are generally considered as garbage. A large number of eggshell wastes are produced from food processing, baking, and hatching industries every year. As a bio-waste, the eggshell with porous structure can still be fully utilized. In this study, eggshell was used as calcium source and template to induce hydroxyapatite (HA) mineralization in hydrothermal reaction. The effects of different calcium sources and phosphorus sources on the morphology and structure of HA were examined. The synthesized particles have been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy apparatuses. The results showed that the porous of eggshell was beneficial for the infiltration of soluble phosphorus and slowly synthesis of HA under hydrothermal conditions. Porous eggshells and creatine phosphate disodium tended to induce the mineralization of spherical HA. Thus HA derived from biological sources can be a possible material in converting bio-waste into value added products by a simple and effective way.
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