RODICA ELENA PATESCU, CLAUDIA MARIA SIMONESCU, GHEORGHE NECHIFOR, CHRISTU TARDEI, IONELA CAMELIA IONASCU THE INFLUENCE OF SYNTHESIS CONDITIONS ON HYDROXYAPATITE ADSORPTION CHARACTERISTICS IN THE PROCESS OF ZN(II) AND PB(II) REMOVAL FROM SINGLE AND BINARY SOLUTIONS Two types of nanohydroxyapatite samples have been obtained by wet chemical precipitation synthesis, involving calcium nitrate tetrahydrate and diammonium hydrogen phosphate as precursors in different conditions. Powders obtained were characterized by X-ray diffraction (XRD) and FTIR spectroscopy. The equilibrium isotherm models related with lead and zinc ions removal from synthetic aqueous solutions have been also investigated. According to this research study, it has been found that the nanohydroxyapatite samples show good heavy metals adsorption capacity, and selectivity for lead ions. It was also observed a slow decreasing of sorption capacity of heavy metal ions from binary solutions compared to that registered from single heavy metal ion solutions.
Keywords: synthetic nanohydroxyapatite, wet chemical precipitation, sorption capacity, lead and zinc removal