To sharply lighten clogging of a film owing to pollutant or the like while the pollutant in water or air is efficiently decomposed by dispersing a photocatalyst in a porous film.
A phototransmittable porous film is formed by dispersing a photocatalyst in it. In this case, the photocatalyst is at least one selected from the group consisting of titanium oxide and zinc oxide. The photocatalyst is preferably dispersed in a porous film of which a pore diameter is set especially at 40-1,000 . Further, water or air is allowed to permeate the porous film. Titanium oxide, zinc oxide or the like is exemplified as the photocatalyst, and those can be used independently or in combination of two or more kinds. Besides, as the porous film may be the one having high phototransmittability (light transmission property), of which transparency can be visually confirmed, and which has preferably a high light transmission property to near ultraviolet radiation, for example, in a wavelength region of approx. 350-450 nm.
JIN TETSUO
AKIYAMA SUMIO
MUTSUSHIRO MINORU
KUBO NORIAKI
NIHON HELS INDUSTRY CORP
Eiji Saegusa