| 摘要 |
PROBLEM TO BE SOLVED: To develop a metal-carrying titanium dioxide photocatalyst which is highly active for sun rays and rays from fluorescent lamps and to obtain an industrial method for the mass production of the catalyst with simple production processes and less hazard. SOLUTION: In the metal-carrying titanium dioxide photocatalyst, at least one metal ultrafine particle having <=2 nm average particle size is deposited on the surface of one rutile type titanium dioxide fine particle. If at least one metal ultrafine particle is present, the wave function of the electrons in the metal intrudes deep in the titanium dioxide fine particle and induces photo-excited electrons produced in a wide range to the outside of the metal by the quantum tunnel effect. Thus, the catalyst has high photocatalytic activity equal to a catalyst carrying many metal ultrafine particles. Since the rutile type is used, the catalyst is effective for both of blue visible rays and UV rays, and as a whole, the photocatalytic efficiency is much higher than that of an anatase type. In the mass production of the catalyst, an org. metal compd. is dissolved in an org. solvent, to which titanium dioxide is added, and the mixture is dried and calcined. Therefore, by using a single solvent, the obtd. mass production method is easily controlled, low-cost and safe.
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