%0 Journal Article
%T Hydroxyapatite/MCM-41 and SBA-15 Nano-Composites: Preparation, Characterization and Applications
%A Oscar A. Anunziata
%A Maria L. Mart¨ªnez
%A Andrea R. Beltramone
%J Materials
%D 2009
%I MDPI AG
%R 10.3390/ma2041508
%X 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.
%K HaP/ MCM-41
%K HaP/ SBA-15
%K nanocomposites
%K F- retention
%K water
%U http://www.mdpi.com/1996-1944/2/4/1508