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| 1.
論文 |
論文
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中根, 久志 ; 青木, 早苗 ; 野浪, 亨 ; 田中, 一彦 ; 森, 勝伸 ; 幸本, 和人 ; 刀根, 如人 ; 亀山, 哲也
概要:
application/pdf<br />Journal Article<br />An acid resistant fluoroapatite coated titanium dioxide (FAp-TiO_2) was synthe
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sized 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.
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| 2.
論文 |
論文
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中根, 久志 ; 青木, 早苗 ; 野浪, 亨 ; 田中, 一彦 ; 森, 勝伸 ; 刀根, 如人 ; 亀山, 哲也
概要:
application/pdf<br />Journal Article<br />An acid resistant fluoroapatite (FAp) coated titanium dioxide (TiO_2) was synthesized by adding a fluoride ion (F^-) to hydroxyapatite (HAp), in order to avoid dissolution of the HAp at an acidic
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atmosphere. In this study, different methods of adding F^- to the apatite in a simulated body fluid were tested; one was synthesized by coating a simulated body fluid including Ca^<2+>, PO_4^<3-> and F^- to the TiO_2 (method 1), and another method was by mixing the F^- after coating a simulated body fluid without the F^- to the TiO_2 (method 2). The apatite crystalline phase of the coated TiO_2 was found to increase with F^-, by using a XRD and a FT-IR. The size of crystalline apatite was strongly affected by the method of adding F^-. The size of the crystalline synthesized by method 1 was larger than that by method 2. The photocatalytic activities of the apatite coated photocatalysts to organic substrates such as propionic acid were evaluated using an ion chromatography. The deterioration of FAp coating during photooxidation of the propionic acid with an UV-irradiation was largely suppressed compared with that of the HAp coating.
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