Abstract
The interaction of oxovanadium(IV) in aqueous solution with crystalline calcium hydroxyapatite has been studied by chemical analysis, XRD, ESR and IR spectra. Results show that oxovanadium(IV) ions are adsorbed on the surface of calcium hydroxyapatite by coordination to OH groups, without modification of the crystalline lattice. At pH values lower than 2.5 the adsorption is negligible. The maximum adsorption is observed at pH 3.5 and 288 K. It is concluded that VO 2+ is indeed adsorbed on calcium hydroxyapatite and that the adsorption is dependent upon pH and temperature. The changes in the electrophoretic mobility of hydroxyapatite with adsorbed VO 2+ were also studied.
Published Version
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