Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 29, Pages 11073-11090Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01628a
Keywords
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Funding
- European Union [241718]
- Fonds Europeen de Developpement Regional (FEDER)
- CNRS
- Region Nord-Pas-de-Calais
- Ministere de l'Education Nationale de l'Enseignement Superieur et de la Recherche
- French-Italian research project PHC Galilee [25955PK]
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Carbonate-containing hydroxyapatites with different Ca/P ratios and optionally containing Na+ cations were successfully synthesized using a precipitation method. The solids were extensively characterized by XRD, LEIS, XPS, IR, TGA and NMR. Further, their acid-base properties were determined by NH3-TPD, PEA-XPS, CO2-TPD and by pulsed liquid chromatography using benzoic acid as a probe. The so-obtained structural, textural and acid-base properties could be finely correlated to give a clear picture of the system. The acidic properties of hydroxyapatites were attributed to Ca2+, surface HPO42- and OH- vacancies and the basic properties were attributed to PO43-, OH- and CaO species. The fine-tuning of the amount, of the nature and the strength of acid-base properties derived by varying the carbonate content in hydroxyapatites can find applications in catalysis, which was illustrated by isopropanol reactivity.
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