Tetraethyl Orthosilicate Coated Hydroxyapatite Powders for Lead Ions Removal from Aqueous Solutions

Abstract

The goal of this study was to synthetize and characterize a porous material based on tetraethyl orthosilicate (TEOS) coated hydroxyapatite (HApTh) after removal experiments of Pb2+ions from aqueous solutions. In order to study the morphology and composition, the samples obtained after removal experiments of Pb2+ions from aqueous solution with the initial Pb2+ion concentrations of the aqueous solutions were 0.1 g·L−1(HApTh-50) and 0.9 g·L−1(HApTh-450) have been investigated by scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). Removal experiments of Pb2+ions were carried out in aqueous solutions with controlled concentration of Pb2+. After the removal experiment of Pb2+ions from solutions, porous hydroxyapatite nanoparticles were transformed into HApTh-50 and HApTh-450 due to the adsorption of Pb2+ions followed by a cation exchange reaction. The obtained results show that the porous HApTh nanopowders could be used for Pb2+ions removal from aqueous solutions.