With the development of industrial economy, the increasingly serious problem of environmental pollution and more prominent in our country, according to authorities world estimates,environmental pollution problems Chinese ranks first in the world, 20 of the world's most pollutedcity, China accounted for half, the issue of environmental protection has become a pressing matter of the moment problem. Transparent glass building materials this tradition in the modern building industry, automobile industry and the family is most widely used, because of increasing air pollution, but also makes them clean work becomes increasingly difficult. Self cleaning glass is to solve the above problem, the function of building glass a new concept proposed by. It isthrough the TiO2 thin film doped in the glass surface plating on the smooth, to solve the aboveproblem, made a powerful probe to reduce air pollution. Heterogeneous photocatalyst photocatalytic oxidation reaction for Chalcogenide Semiconductor, we chose TiO2 because it is nontoxic, insoluble, good photo catalytic activity and low cost etc.

In 1969 Japan trees and Ren (Hashimoto) and Toshima Aki (Fujishima) found TiO2photocatalysis and hydrophilicity.

In 1972 Japan by TiO2 photocatalyst made a lot of research work.

In 1995 the United States Paz development of photocatalytic TiO2 film on the surface of the glass, the same year the Tokyo auto show car manufacturers on display on the car with self-cleaning glass assembly is the windshield.

In 2001 the British Pilkington company produced by chemical vapor deposition (CVD) coated with TiO2 film self-cleaning glass, sales in the market with Pilkington Actiw grades.