Useful. Photocatalyst technology is 1967. Professor Kenichi Bento of the University of Tokyo and Fujishima Akira, a graduate student at that time, accidentally discovered that titanium dioxide electrode can decompose water into hydrogen and oxygen under the irradiation of ultraviolet rays. 1972 published a paper on photocatalyst effect in the British magazine Science, and photocatalyst technology came into being.

Under the irradiation of sunlight, photocatalyst will produce a photocatalytic reaction similar to photosynthesis, which can oxidize and decompose various organic compounds and some inorganic substances, and decompose organic pollutants into pollution-free water (H2O) and carbon dioxide (CO2), so it has strong functions of deodorization, mildew prevention, pollution prevention, self-cleaning and air purification. Photocatalyst can not only decompose organic molecules floating in the air, but also have a certain sterilization and disinfection effect.

However, photocatalyst also has its limitations, because a very important condition for photocatalyst to play its role is that under the condition of light, ordinary indoor conditions often lack light, which leads to photocatalyst not playing a good role. Later light green is a new material developed on the basis of photocatalyst. Without the participation of light, it can be directly decomposed with formaldehyde, and can penetrate into the interior of the board to achieve the function of root decomposition without secondary pollution.