Method for Producing Tungsten Trioxide Powder for Photocatalyst

Disclosed is a method for producing a tungsten trioxide powder for photocatalysts, which is characterized by comprising a sublimation step wherein a tungsten trioxide powder is obtained by subliming a tungsten metal powder or a tungsten compound powder by inductively coupled plasma processing in an oxygen atmosphere, and a heat treatment step wherein the tungsten trioxide powder obtained in the sublimation step is heated at 300-1000 DEG C for 10 minutes to 2 hours in an oxidizing atmosphere. A tungsten trioxide powder obtained by such a method for producing a tungsten trioxide powder for photocatalysts has high photocatalytic activity under visible light.

For the production of the photocatalyst powder, tungsten trioxide, said method comprising: a step of sublimation, in an oxygen atmosphere by using the following types of processing in the distillation of at least ー tungsten powder or the tungsten compound powder to obtain the tungsten trioxide powder : inductively coupled plasma processing, arc discharge processing, laser processing and electron beam processing; and the heat treatment step, in an oxidizing atmosphere at 300 ° C to 1000 ° C in said heat treatment step, the sublimation of the tungsten trioxide powder obtained 10 minutes to 2 hours inches, wherein said powder has a crane crab oxide selected from the monoclinic crystal, rhombic crystal and monoclinic crystal brother of at least two crystal structures, wherein the tungsten trioxide powder has a BET specific surface area of ​​8. 2m2 / g to 820m2 / g, wherein the tungsten trioxide powder obtained by the image analysis of particle size distribution (D90-D10) / D50 in the 0.3 to 2 range, and wherein said catalyst is a visible light photocatalyst and The wavelength of visible light of 390 to 830nm.




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