可視光応答型光触媒の合成と環境浄化プロセスの開発

概要

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In this study, to improve the photocatalytic reactivity of TiO2 and to extend its light absorption intothe visible light region, nitrogen (N) and fluorine (F) doped TiO2 and some Perovskite-typeLaTiO2+xN1-x were synthesized. The photocatalytic activity of N,F-doped TiO2 under not onlyvisible irradiation but also UV irradiation exceeded that of commercial anatase type TiO2 (ST-01 byIshihara Sangyo, Ltd.). This high photocatalytic activity under LED irradiation is indispensable todevelopment of photocatalytic environmental purification process. Some Perovskite-typeLaTiO2+xN1-x with anion nonstoichiometry were prepared by heating an oxide precursor underammonia atmosphere and successively annealed under diluted ammonia. Increasing O/N ratioenhances the optical bandgap of the oxynitrides. A series of perovskite-type LaTiO2N materials withcompositions a slightly deviated from the stoichiometric metal composition was also prepared.Increasing Ti/La ratio results in deterioration of reflectivity.
徳島大学の論文