How to understand the purification functions such as photocatalyst UV lamps?

by:Funglan     2022-01-25
You must have heard a lot of the words photocatalyst and ultraviolet light, but what does it mean? Here is a brief description for you. 1. Photocatalyst Photocatalyst: It is a photo-semiconductor material with photocatalytic function represented by nano-scale titanium dioxide TiO2. When coated on the surface, under the action of ultraviolet light, it absorbs light energy and converts water or oxygen into strong oxidative active groups to degrade air pollutants. Note: Photocatalyst is only a catalyst and does not have a purification function by itself. And its catalytic effect is related to the diameter of the material.>50nm, not photoactive, cannot be used. <30nm has catalytic effect. The fineness of 8-10nm is the best, so the general nanometer fineness of high-quality photocatalysts is 5-10 nanometers. 2. Ultraviolet Ultraviolet () UV) refers to light with a wavelength of 10-400nm. According to the wavelength from long to short, it is divided into: long-wave ultraviolet, near-ultraviolet, medium-wave ultraviolet, medium-ultraviolet, short-wave ultraviolet, far-ultraviolet, vacuum ultraviolet, shallow ultraviolet, ultra-ultraviolet, and extreme ultraviolet. The purification function is short ultraviolet wave UVC, with a wavelength of 280 nm to 100 nm. Short-wavelength ultraviolet rays with wavelengths < 200nm can decompose oxygen molecules O2, and produce ozone O3. Ultraviolet rays and ozone have strong oxidative decomposition ability, which can purify volatile organic VOCs with peculiar smell (such as formaldehyde, benzene, toluene, ethanol, chloroform, etc.). Therefore, through these definitions, it can be known that the photocatalyst UV lamp has the effect of sterilization and disinfection, but the effect on fine dust PM2.5 is relatively poor. Therefore, consumers should consider comprehensively when purchasing.
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...
Thank you for your enquiry, we will get back to you ASAP