酸化チタン含有カーボンフィルムの調製と光触媒能

Abstract

Carbon films containing photocatalyst TiO_2 powders were prepared from poly(amide acid) with the dispersion of fine particles of TiO_2 in the solution, followed by casting, imidization and carbonization at 800-900℃. In order to get high adsorptivity of methylene blue (MB) in water, activation by air oxidation at 400℃ for 2 h was performed. By the carbonization of polyimide at 900℃, a part of anatase type TiO_2 was transformed to rutile type TiO_2. By the carbonization at 850℃, however, no tranformation to rutile was detected, due to the suppression by coated carbon. By the oxidation of carbon film carbonized at 850℃, high adsorptivity for MB and high rate constant for the decomposition of MB were obtained.