Radionuclide sorption diagnostics of nanoagglomerates and textures based on them

Diagnostics of nanoagglomerates of hydroxyapatite Ca 10 (PO 4 ) 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 m 2 g −1 , which is close to the theoretical density of individual nanocrystals (900 m 2 g −1 ), and the specific surface area of textured hydroxyapatite (macrospheroids) is 250–300 m 2 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.