アナターゼ型チタニア固溶体ナノ粒子の水熱条件下における創製

Abstract

Anatase-type titania (TiO_2) solid solution nanoparticles doped with transition metal cations were directly synthesized from aqueous solutions under hydrothermal conditions. Scandium was doped into anatase nanoparticles up to 10 mol% by hydrothermal crystallization from amorphous co-precipitates. Niobium-doped anatase-type titania nanoparticles were also directly formed under mild hydrothermal conditions using the hydrolysis of urea. The prominent effects of forming solid solutions with niobium oxide for anatase-type TiO_2 on the enhancement of photo-decomposition of MB under UV irradiation and adsorptivity in the dark were confirmed. The anatase-type Ti_<1-2X>Nb_XAl_XO_2 solid solutions, that were directly formed under mild hydrothermal conditions using the hydrolysis of urea, showed improved photocatalytic activity.