The working principle of the photo-catalytic air purification equipment: Under the action of visible light from the outside or ultraviolet light inside the equipment, a catalytic oxidation process occurs. The photo-catalytic oxidation reaction uses nano-TiO2 (titanium dioxide) and air as catalysts, with light as energy, to break down organic matter into CO2 and H2O. During the photo-catalytic oxidation process, under the illumination of ultraviolet light at 253.7nm, the nano-TiO2 catalyst plate absorbs light energy and simultaneously generates electron and hole jumps. The strong combination of these jumps produces electron-hole pairs, which generally react with surface adsorbed H2O and O2 to form highly reactive hydroxyl radicals (OH-) and superoxide ion radicals (O2-, O-). This process can directly oxidize various harmful gases and other TVOC organic substances in the air into small molecules such as H2O and CO2. Since the oxidizing agents used are H2O and O2 from the air, there is no secondary pollution.For example, using the ultraviolet light beam at 185nm to decompose oxygen molecules in the air into free oxygen, or reactive oxygen species (ROS). Due to the unbalanced positive and negative electrons in the free oxygen, it needs to bind with oxygen molecules to produce ozone. UV + O2 + O- + O* (reactive oxygen) → O + O2 + O3 (ozone). As is well-known, ozone has a strong oxidizing effect on organic matter, providing immediate purification effects on industrial waste gases and other small molecules. After treatment by a photo-oxidation catalytic waste gas purification device, organic waste gases can be decomposed into H2O and CO2, etc., with an efficiency of over 85%.