What is the function of photocatalyst?
2 Answers
Photocatalyst effectively prevents mold, removes odors, sterilizes, and inhibits bacteria. Photocatalyst is a nanoscale metal oxide material (titanium dioxide is commonly used). It is applied to the surface of a substrate and forms a thin film after drying. Under the action of light, it produces a strong catalytic degradation function: it can effectively degrade toxic and harmful gases in the air; it can effectively kill various bacteria, with an antibacterial rate of up to 99.99%, and can decompose and detoxify toxins released by bacteria or fungi; it also has functions such as odor removal and anti-pollution. Under light irradiation, photocatalyst produces a photocatalytic reaction similar to photosynthesis, generating highly oxidizing free hydroxyl radicals and reactive oxygen species. It has strong photo-oxidation and reduction capabilities, enabling the oxidation and decomposition of various organic compounds and some inorganic substances. It can destroy bacterial cell membranes and solidify viral proteins, killing bacteria and decomposing organic pollutants, breaking them down into non-polluting water (H2O) and carbon dioxide (CO2). Thus, it has powerful functions such as sterilization, odor removal, mold prevention, self-cleaning, and air purification.
I've driven many cars, and nowadays a lot of vehicles come equipped with photocatalysts. Simply put, they can purify the air inside the car. For example, under light, photocatalysts can break down odors and mold, much like how they automatically sterilize and deodorize on sunny days, keeping the cabin air fresh. This feature is particularly useful in cars, especially those that have been parked for a long time, where seats or carpets might develop mildew—photocatalysts make dealing with these issues much easier. When driving, I also make sure not to let dust accumulate too much and regularly clean the interior to prolong its effectiveness. If you accidentally spill a drink, it can help eliminate residual odors. Overall, it's a common application in car interiors and air conditioning systems, but remember not to use it recklessly in dark places, as the effect diminishes with less light.