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Materials 2009, 2(4), 1508-1519; doi:10.3390/ma2041508
Article

Hydroxyapatite/MCM-41 and SBA-15 Nano-Composites: Preparation, Characterization and Applications

* ,
 and
Grupo Fisicoquímica de Nuevos Materiales, Centro de Investigación y Tecnología Química (CITeQ), Facultad Córdoba, Universidad Tecnológica Nacional, 5016 Córdoba, Argentina
* Author to whom correspondence should be addressed.
Received: 29 July 2009 / Revised: 28 September 2009 / Accepted: 29 September 2009 / Published: 30 September 2009
(This article belongs to the Special Issue Composite Materials)
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Abstract

Composites of hydroxyapatite (HaP) and highly ordered large pore mesoporous silica molecular sieves such as, Al-SBA-15 and Al-MCM-41 (denoted as SBA-15 and MCM-41. respectively) were developed, characterized by XRD, BET, FTIR, HRTEM and NMR-MAS, and applied to fluoride retention from contaminated water. The proposed procedure by a new route to prepare the HaP/SBA-15 and HaP/MCM-41, composites generates materials with aluminum only in tetrahedral coordination, according to the 27Al NMR-MAS results. Free OH- groups of HaP nanocrystals, within the hosts, allowed high capacity fluoride retention. The activity of fluoride retention using HaP/MCM-41 or HaP/SBA-15 was 1-2 orders of magnitude greater, respectively, than with pure HaP.
Keywords: HaP/ MCM-41; HaP/ SBA-15; nanocomposites; F- retention; water HaP/ MCM-41; HaP/ SBA-15; nanocomposites; F- retention; water
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Anunziata, O.A.; Martínez, M.L.; Beltramone, A.R. Hydroxyapatite/MCM-41 and SBA-15 Nano-Composites: Preparation, Characterization and Applications. Materials 2009, 2, 1508-1519.

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