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Photo catalyst made in Japan

 

1.What is photo catalyst?

1-1.History of photo catalyst

Basic theory of photo catalyst was invented by Japanese chemists in1972. They invented that water decomposed only by light(UV) using TiO2 & platinum electrodes. In 1992, coating method of TiO2(Titanium dioxide) was developed. And it was found that organic materials were decomposed by radicals coming from photo catalyst reaction. In 1997, hydrophilicity of photo catalyst was invented. All of these inventions were done in Japan and it is said photo catalyst is a technology from Japan.

 

1-2.Theory of photo catalyst

There are following two functions in photocatalyst.TiO2 is widely used as photo catalyst material.

(1)Decomposition of harmful organic materials

(2)Hydrophilicity

 

(1)Decomposition of harmful organic materials

When TiO2 is exposed to UV (Ultraviolet rays), it makes electrons and holes, which means TiO2 is ionized. Electron and holes react with oxygen and water in the air, and make O2 and OH2 radicals. These radicals decompose harmful organic materials.

(2)Hydrophilicity

When TiO2 is exposed to UV, the surface becomes hydrophilic. Hydrophilicity

Prevent from fogging of glasses and mirrors. In addition, soils on the surface can be easily removed with water(Self-cleaning).

 

1-3.Application of photo catalyst

Using photo catalyst technology, there are a lot of application as follows. However,

most of the photo catalyst needs UV to make reaction at the moment. To expand the application of photo catalyst, many of Japanese companies are developing new photo catalyst which can be react even with normal light(radiant energy)

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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