ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Hydroxyapatite modified with silica used for sorption of copper(II)

Erzsébet-Sára Bogya, Réka Barabás, Alexandra Csavdári, Valentina Dejeu, and Ioan Bâldea

Department of Physical-Chemistry, Babes-Bolyai University, Cluj-Napoca, Romania

E-mail: bogyaes@chem.ubbcluj.ro

Received: 14 October 2008  Revised: 1 March 2009  Accepted: 3 March 2009

Abstract: This paper aims to increase the sorption capacity of hydroxyapatite and to find the best apatite-based material for metal ions sorption. The sorption process of copper ions from water solutions by HAP and structurally modified HAP was carried out in this work. Structural modifications of HAP were realized in the preparation phase by an addition of sodium silica into the reaction medium. The prepared materials were characterized by physical-chemical methods: IR, electron-microscopy and X-ray diffraction. The composites characterized were tested in kinetic studies regarding ion exchange and adsorption of Cu²⁺. It was revealed that the silica content, particle size and initial copper ion concentration influence the process rate.

Keywords: hydroxyapatite - silica addition - sorption capacity - sorption efficiency

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-009-0059-x

Chemical Papers 63 (5) 568–573 (2009)