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Titanium cation was introduced into calcium hydroxyapatite by three different procedures; (A) stepwise precipitation, (B) coprecipitation, and (C) surface treatment with aqueous titanium. The solids (Ti-CaHAp) thus obtained were employed as a photo-catalyst for the decomposition of methylene blue. No photo-catalytic activities were observed on Ti-CaHAp obtained from the surface treatment. Although rather great photo-catalytic activities have been already reported on Ti-CaHAp prepared with the stepwise precipitation, the decomposition of methylene blue on Ti-CaHAp depended on the atomic ratio of Ti/Ca in the catalysts. The photo-catalytic activities on Ti-CaHAp obtained from the coprecipitation were evidently greater that those on the solids obtained with the stepwise precipitation.

phosphorus research bulletin

EFFECTS OF INCORPORATION PROCEDURE OF TITANIUM CATIONS INTO CALCIUM HYDROXYAPATITES ON THE PHOTO-CATALYTIC ACTIVITIES FOR THE DECOMPOSITION OF METYLENE BLUE