Effect of Crystallinity of Hydroxyapatite Nanoparticles Prepared from Bovine Bone on Adsorption of Ammonia Gas

Abstract

The adsorption of ammonia gas on nanoparticle hydroxyapatite (HA) prepared from bovine bone was investigated. HA is well known as a good adsorbent for both of gas and liquid adsorbate. In this study, bovine bone was cleaned, calcined at 700 °C for 4 hrs and subsequently ground. The ground bovine bone powder was the starting material for synthesize of nanoparticle HA via precipitation. As-precipitated HA nanoparticles were filtered, washed and finally calcined at 500, 700, 1000 °C. Phase analyses were performed by X-ray diffraction (XRD) and the result showed that the higher the calcined temperature, the higher the degree of crystallinity. The result of ammonia (NH3) gas adsorption indicated that as-precipitated HA with low crystallinity displayed better adsorption activity to NH3 gas than calcined HA with high crystallinity.