Effect of Heat Treatment on Growth Adsorption Nano-Hydroxyapatite Used in Removal Heavy Metals

The development of new products which are abundant in nature, low in cost and have minimal environmental impact for restoration or remediation of natural resources is an important area of material sciences. The use of hydroxyapatite materials as potential sorbents for the removal of heavy metals has been emphasized in recently decade. Nanocrystalline hydroxyapatite powder was synthesized by calcium nitrate hydrated and di-ammonium hydrogen phosphate via the solutionprecipitation method followed by heat treatment. Phase evolution, were studied by XRD. TEM technique was used for estimate crystal size and morphology. Moreover, a simple kinetic growth investigation was performed on the nanocrystalline growth process during heat treatment. Results have shown nanocrystalline hydroxyapatite with hexagonal system can be successfully prepared from raw materials by the precipitation technique to 1200 °C and growth rate to increase exponentially with temperature and also the growth rate constants to increase with time.