Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1996-04-10
1999-02-23
Tsang, Cecilia J.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
2041582, 20415821, 2041573, 588227, 55279, C07B 6300
Patent
active
058747010
ABSTRACT:
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 a 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 suitable for general lighting applications, such as a fluorescent lamp, and is photoexcited by the small amount of ultraviolet radiation 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 wavelengths which have a higher energy than the band gap energy of the photo-catalyst is 0.001-1 mW/cm.sup.2, preferably, 0.01-0.1 mW/cm.sup.2. The bacteria and chemical compounds deposited on the photoexcited thin film are photodecomposed.
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patent: 5152814 (1992-10-01), Nelson
patent: 5225167 (1993-07-01), Wetzel
H. Kawaguchi, "Photocatalytic Decomposition of Phenol in the Presence of Titanium Dioxide," Environmental Technology Letters, vol. 5, pp. 471-474, 1984.
Allen J. Bard, "Photoelectrochemistry and Heterogeneous Photocatalysis at Semiconductors," Journal of Photochemistry, Oct. (1979), pp. 59-75.
Akira Fujishima et al, "Electrochemical Photolysis of Water at a Semiconductor Electrode," Nature, vol. 238, Jul. 7, 1972, pp. 37-38.
Fujishima Akira
Hashimoto Kazuhito
Kitamura Atushi
Kojima Eiichi
Watanabe Toshiya
Delacroix-Muirheid C.
Toto Co., Ltd.
Tsang Cecilia J.
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