Abstract
Titanium dioxide coated with apatite (AP–TiO2) was produced by stirring commercial TiO2 (ST-01) into a simulated body fluid (SBF). Radicals generated at the surface of photoaccelerated ST-01 and AP–TiO2 were analyzed by electron spin resonance (ESR) spectroscopy in a spin-trapping experiment. During photoirradiation for 0–60 s, photogenerated [DMPO–OH] for ST-01 and AP–TiO2 increased with irradiation time. On the other hand, during photoirradiation for 60–500 s, [DMPO–OH] for ST-01 decreased but [DMPO–OH] for AP–TiO2 did not. On the basis of these phenomena, it was suggested that DMPO trapped photogenerated OH• and was converted into DMPO–OH which then decomposed to H2O2 upon further photoirradiation. The decomposition of DMPO–OH and generation of H2O2 were prevented by apatite at the surface of TiO2. Additionally, the adsorptive nature of AP–TiO2 for methylene blue and photocatalytic activity for bleaching were improved by apatite at the surface of TiO2.
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