フッ素化アパタイト被覆二酸化チタンにおける合成条件の最適化(テクニカルレポート)

Abstract

An acid resistant fluoroapatite coated titanium dioxide (FAp-TiO_2) was synthesized by adding a fluoride ion (F^-) to hydroxyapatite (HAp), in order to avoid dissolution of the HAp at an acidic atmosphere. In this study, the optimization of synthetic conditions of FAp-TiO_2 was investigated in terms of the amount of the fluorine (F^-) added to the simulated body fluid, the reaction temperature and the time. The addition of F^- to simulated body fluid was performed after coating HAp on the surface of TiO_2 surface. The crystallinity of FAp phase generated on the TiO_2 was strongly affected by changing the reaction conditions. The optimized synthetic conditions of FAp-TiO_2 as photocatalyst were the addition of 0.25mM-0.5mM F^- in the fluid and then the reaction time for 3h at 60℃. The adsorptivity and the photocatalytic activity of the FAp-TiO_2 in the optimum conditions were investigated using the butyric acid and trimethylamine as model solutions. Consequently, the FAp-TiO_2 could obtain higher adsorptivity and photocatalytic activity for trimethylamine, rather than the uncoated TiO_2.