光触媒在紫外线光的照射下，会产生类似光合作用的光催化反应，产生出氧化能力极强的自由氢氧基和活性氧，具有很强的光氧化还原功能，可氧化分解各种有机化合物和部分无机物，能破坏细菌的细胞膜和固化病毒的蛋白质，可杀灭细菌和分解有机污染物，把有机污染物分解成无污染的水（H2O）和二氧化碳（CO2），因而具有极强的杀菌、除臭、防霉、防污自洁、净化空气功能。
Photocatalyst can produce photocatalysis reaction similar to photosynthesis under the irradiation of ultraviolet light, and produce free hydrogen and active oxygen with strong oxidation ability. It has strong photo oxidation-reduction function, can oxidize and decompose various organic compounds and some inorganic substances, can destroy the cell membrane of fine bacteria and solidify the protein of virus, can kill bacteria and decompose organic pollutants The organic pollutants are decomposed into non polluted water (H2O) and carbon dioxide (CO2), so it has strong functions of sterilization, deodorization, mildew prevention, pollution prevention and self-cleaning, and air purification.