To provide a method for producing black titanium dioxide anatase composite powder for a visible light-responsive photocatalyst, which powder is developed on the ground that the scope of application of a photocatalyst product is expanded into ultraviolet light-poor places where solar energy is utilized effectively, exhibits a photocatalytic function to visible light and ultraviolet light and has a black hue unpublished up to now and to provide a method for producing a solution composition for producing the black titanium dioxide anatase composite powder.
The solution composition suitable for producing the visible light-responsive black titanium dioxide anatase composite powder can be synthesized from an organic solvent containing an anionic complex obtained by coordinating a carbonate ion and a peroxide ion to titanium and an amine cation. The visible light-responsive black titanium dioxide anatase composite powder can be obtained by heat-treating the powder, which is obtained by removing the organic solvent from the solution composition, in an air atmosphere.
NAGAI HIROMI
KIYONO CHIHIRO
SATO TERUBUMI
Tadao Noguchi