Abstract
The influence of the anionic substitution and the thermal treatment on the acid/base properties of hydroxyapatite was studied by temperature-programmed desorption of ammonia (TPD-NH 3). Stoichiometric hydroxyapatite, A-type and B-type carboapatites have been synthesized. Substitution of OH − by the CO 3 2− (Carbo-A) modifies the acid strength distribution, increases the overall acidity and acid site density (μmol/m 2). Substitution of the PO 4 3− (B-site) by the CO 3 2− did not lead to noticeable changes on the adsorption sites. These results suggest that the Ca 2+ ions are the most significant sites for ammonia adsorption.
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