In addition to TVOC product series Photocatalyst generates photocatalytic reaction under ultraviolet radiation, which effectively degrades TVOC and other macromolecular gases, eventually producing carbon dioxide and water. Photocatalyst was discovered by Kenichi Honta and Akira Fujishima in Japan in 1967. With the breakthrough of nanotechnology in 1999, the activity of photocatalyst has been solved.Has studied the photocatalyst materials TiO2, ZnO, CdS, WO3, Fe2O3, PBS, SnO3, In2O3, ZnS, SrTiO3 and SiO2, which is represented by nano TIO ₂, with cheap, acid and alkali corrosion resistance, non-toxic, catalytic ability, good stability, will not produce secondary pollution characteristics, is a good air purification materials. The oxidation energy of hydrogen and oxygen radicals generated by photocatalyst under UV irradiation in a specific band is about 140 kcal/mol, and the oxidation energy of highly reactive oxygen negative ions is as high as 120kcal/mol, which is far higher than the ...