Tungsten Oxide Photocatalyst Producing Method

Titanium oxide is a material which is widely known as a photocatalyst, but almost nonfunctional in a place without ultraviolet rays. Therefore, extensive research has been conducted on a tungsten oxide photocatalyst which can use visible light.

A photocatalyst using tungsten oxide particles singly generates holes in a valence band and electrons in a conductive band, respectively, by light excitation under irradiation of visible lights. However, since the conductive band has an energy level lower than a redox potential, the oxygen cannot be reduced with the electrons excited in the conductive band and the generation of active oxygen species is not sufficient. As a result, the photocatalyst does not show photocatalyst activity in an environment under visible light irradiation.

A tungsten oxide photocatalyst having titanium oxide and copper ion supported thereon, which is obtained by dissolving urea in a solution in which copper-ion supporting tungsten oxide particles are uniformly dispersed in a titanium oxide sol, thermally decomposing the urea to thereby allow the titanium oxide to precipitate on the surface of copper ion-supporting tungsten oxide and to be supported thereon, wherein the change of diffuse reflectivity (at wavelength of 700 nm) is less than 3% after the irradiation of ultraviolet at center wavelength of 365 nm in air with irradiance of 1 mW/cm2 for 72 hours.
 

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