| 摘要 |
PURPOSE:To remove nitrogen oxide of low concentration, etc., in the environmental atmosphere. CONSTITUTION:A cleaning material 13 in the form of a sheet or a panel is constituted by fixing a photocatalyst mainly consisting of titanium dioxide or a mixture of titanium dioxide and active carbon by using fluororesin, etc., and it is installed outdoors by using the external wall of a building, etc. The photocatalyst irradiated with near ultraviolet rays having a 300-400nm wavelength range of sunlight is activated to turn nitrogen oxide, etc., in the air into nitric acid, etc., which is captured on the surface. On the other hand, the photocatalyst which has lowered in activity by the accumulation of products is washed by a precipitation to restore its function. And volatile contaminants transferred to gas out of water by using the cleaning material 13 or contaminants in water are decomposed by titanium dioxide. |
