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Journal of Nanomaterials
Volume 2014, Article ID 176426, 7 pages
Research Article

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

1National Institute of Materials Physics, P.O. Box MG 07, 077125 Magurele, Romania
2ISTO, UMR 7327 CNRS-Université d’Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France
3Faculty of Physics, University of Bucharest, 405 Atomistilor, P.O. Box MG-1, 077125 Magurele, Romania
4Hyperion University of Bucharest, 169 Calea Călăraşilor, 030615 Bucharest, Romania
5Universite Bordeaux, EA 4592 Géoressources & Environnement, ENSEGID, 1 allée F. Daguin, 33607 Pessac Cedex, France

Received 21 June 2014; Accepted 8 July 2014; Published 21 July 2014

Academic Editor: Daniela Predoi

Copyright © 2014 Rodica V. Ghita et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.