Journal
MATERIALS
Volume 2, Issue 4, Pages 1508-1519Publisher
MDPI
DOI: 10.3390/ma2041508
Keywords
HaP/ MCM-41; HaP/ SBA-15; nanocomposites; F- retention; water
Categories
Funding
- Conicet
- CONICET Argentina [112-200801-00388]
- MINCyT Cba. [1210/07]
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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 Al-27 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.
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