The light catalyst is any

　　The light catalyst so long as receives the ultraviolet ray the illumination, all can decompose from the bacterium to atmosphere in deleterious substance. Its application scope already developed to the environment purification domain, like produced has exempted the dirt wall and exempts the dirty glass and so on.

　　The light catalyst was discovered in 1967. At that time graduate student's University of Tokyo cane island illustrious professor to put in the water in an experiment the titamium oxide list crystallization in motion light illumination, finally discovered the water is decomposed into the oxygen and the hydrogen. This effect achievement "this are many?The cane island effect "but is world famous, this name combined cane island professor and at that time his instruction teacher ---- Tokyo craft university principal this healthy name. Because is draws support from the light the strength promote the oxidation decomposition reaction, therefore afterwards was called as this phenomenon in titamium oxide the light catalyst.

　　The titanium dioxide light catalyst when receives the sunlight the illumination, on the titanium atom electron by the photoexcitation, is formed the electronic hole, in the air water, the oxygen can by resolve into O2- With OH-, has the greatly strengthened oxidizing power, this kind of oxidized ability, can cause the organic matter to decompose the carbon dioxide and the water, also can degrade the partial inorganic compounds, thus achieved the sterilization, deodorizes, the purification air effect.

　　About the light catalyst, the recent people displayed the strong interest to "the visible light reply light catalyst". This kind of light catalyst under the weak ultraviolet ray also can have the response in the room. The visible light reply light catalyst was adopts in the original titamium oxide promoted measure and so on surface treatment which the ultraviolet ray absorbed, in under the light also might carry on the response. Starts from 2001, had many manufacturers to start to put into the use, some even applications in interior trim material. These products not only may in the cleaning cell the air, but also may eliminate causes to appear the office syndrome the deleterious substance - - formaldehyde.

　　The light catalyst has the very strong oxidizing power, may the air in organic matter, NOX, H2S, as well as in the room in the air formaldehyde, the benzene, the ammonia and so on the deleterious substance.