Synthesis of Nanocrystalline β-Tricalcium Phosphate from Chicken Eggshells by Precipitation Method

摘要

Nanocrystalline β-TCP was successfully synthesized by simple precipitation method using calcium nitrate obtained eggshell as the calcium source, ammonium phosphate as the phosphate source and ammonia solution as agents for pH adjustment via our synthesis condition. Also, the effect of calcination temperature in range of 200-1200°C on phase transformation was investigated. The synthesized powders were characterized by X-Ray Diffraction (XRD), Rietveld refinements and Fourier transform infrared (FT-IR) techniques. The results indicate that β-TCP was observed at the calcination temperature of 700°C and above. Furthermore, their crystallinity and crystalline size increase with increasing temperature. The a/c ratio of lattice parameter at temperature of 700-1200°C is similar to the standard phase of β-TCP. The chemical structure confirmed via FT-IR showed the band positions and functional groups, which are similar to that of stoichiometric β-TCP. Finally, eggshells are the potential material for synthesizing nanostructured BCP and may be possible in a low-cost production.