Abstract
Diagnostics of nanoagglomerates of hydroxyapatite Ca10(PO4)6(OH)2 and of hierarchic structures based on them by the method of adsorption of tritium-labeled sodium succinate is made. The adsorption kinetics is one-step in the case of hydroxyapatite nanocrystals and two-step in the case of textured hydroxyapatite. The parameters of the S-shaped sorption isotherms are calculated; they are described by the Guggenheim-Fowler-Frumkin equation. The specific surface area of hydroxyapatite nanoagglomerates is 650–700 m2 g−1, which is close to the theoretical density of individual nanocrystals (900 m2 g−1), and the specific surface area of textured hydroxyapatite (macrospheroids) is 250–300 m2 g−1. Adsorption of succinate ions on the surface of hydroxyapatite nanocrystals leads to the formation of a tightly bound monolayer, which may lead to structural rearrangement of the sorbent.
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