Ti-Substituted Hydroxylapatite Precipitated in the Presence of Titanium Sulphate: A Novel Photocatalyst?
Hydroxylapatite (HAp) doped with about 10 mol.% Ti (TiHAp) has recently been reported to be successfully synthesized by the co-precipitation method coupled to heat treatment and attracted attention as a novel photocatalyst. The formation of TiHAp was re-investigated using the same method and materials. The synthesis products were analysed by Raman spectroscopy and X-ray diffraction. It is demonstrated that the product obtained by the co-precipitation method is a composite material that consists of nano-crystalline anatase and subordinately perovskite (CaTiO3) along with nano-crystalline, slightly Ca-deficient HAp. It follows that the observed photocatalytical properties of TiHAp obtained by this synthesis method are related to the formation of such a composite material rather than to Ti-doped HAp. The experimentally observed photocatalytical properties of TiHAp samples must thus be related to other product properties (e.g., Ti phase composition, crystallite size, and/or surface state) that are controlled by both the presence of Ti in solution and the synthesis method.
Hydroxylapatite, TiHAp, Ca-deficient HAp, Titanium Sulphate, Raman Spectroscopy, X-ray Diffraction
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