Photocatalytic air treatment process under room light

Details Photocatalytic air treatment process under room light Photocatalytic air treatment process under room light

A - Human Necessities

61

L

A61L 2/232 (2006.01) A61L 9/20 (2006.01) B01D 53/86 (2006.01) B01D 53/88 (2006.01) B01J 19/08 (2006.01) B01J 21/06 (2006.01) C04B 41/85 (2006.01)

Patent

CA 2127552

A process for photocatalytically treating a hospital room contaminated by bacteria or an interior environment bearing airborne malodorous substances. A thin film of photocatalyst made of semiconductor such as titanium dioxide is disposed on the inner wall of the hospital room or living space. The photocatalytic thin film is irradiated by a light source of general lighting applications, such as a fluorescent lamp, and is photoexcited by a small amount of ultraviolet radiations included in the light of fluorescent lamp. The wattage of the fluorescent lamp as well as the distance between the photocatalytic thin film and the lamp are selected such that the intensity of those UV radiations which have a higher energy than the band gap energy of the photo-catalyst is 0.001-1 mW/cm2, preferably, 0.01-0.1 mW/cm2. The bacteria and chemical compounds deposited on the photoexcited thin film are photodecomposed.

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