PHOTOCATALYSIS AND INFLUENCE ON THE RESIN OF Ti(IV) DOPED HYDROXYAPATITE

抄録

Photocatalytic apatite(PCAP) particles doped with Ti(IV) ions were synthesized by a coprecipitation method. Adsorption and decomposition of methylene blue were examined by spectrophotometry. Under dark conditions, PCAP showed higher adsorption of methylene blue than TiO₂ did. The particles were irradiated with black light after reaching adsorption equilibrium, and absorbance was decreased by the photocatalyst reaction of the PCAP as well as by the TiO₂. Decrease in absorbance of PCAP was larger than in TiO₂, and consequently the decomposition of methylene blue was seen to be much more effective by PCAP. Further, the photocatalysts were kneaded separately into resin, effects of photocatalysis by both PCAP and TiO₂ were observed in the resin, and influence on the resin was examined. Chalking occurred on the surface of the resin with TiO₂. but was not observed on the resin with PCAP, and it was determined that PCAP had little overall influence on the resin.