Application of Ultraviolet Radiation and Photocatalyst in air purifiers
Application of Ultraviolet Radiation
Ultraviolet (UV) radiation is a type of electromagnetic radiation divided into three categories based on wavelength: UVA, UVB, and UVC. UVC has a shorter wavelength and strong sterilization and disinfection ability, so it has been widely used in air purifiers.
UVC sterilization: UVC's wavelength range is approximately 200-280 nanometers. It can destroy microorganisms' DNA or RNA structure, causing them to lose their reproductive ability. Thus, UVC plays a role in sterilization and disinfection.
Oxidation: Specific wavelength ultraviolet radiation can also react with oxygen in the air to generate ozone, which has strong oxidizing properties and can further oxidize and decompose organic pollutants. This wavelength of UV is usually not used in household air purifiers.
Application of Photocatalyst
Photocatalyst is a material with photocatalytic activity, and the most commonly used is titanium dioxide (TiO₂). When photocatalysts are exposed to ultraviolet radiation, they generate electron-hole pairs, which can trigger chemical reactions to decompose harmful substances in the air.
It can decompose harmful substances in the air, such as volatile organic compounds (VOCs), formaldehyde, ammonia, etc., into harmless water and carbon dioxide.
Safe and harmless: The photocatalyst does not release harmful substances; the final products are water and carbon dioxide, which will not cause secondary pollution.
Ultraviolet and photocatalytic technologies are both highly effective purification methods in air purifiers. Ultraviolet radiation is mainly used for sterilization and disinfection, while photocatalysts can decompose harmful chemicals in the air. These two technologies are often combined to provide a more comprehensive and efficient air purification effect. Using these technologies, air purifiers can significantly improve indoor air quality and provide users with a healthier and more comfortable living environment.
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