Photocatalyst is a general term for photocatalytic photo-semiconductor materials represented by nano-scale titanium dioxide. It is an ideal material for the treatment of indoor environmental pollution in the world. It does not consume energy on the earth and is a trace pollutant in the environment. The best choice. Under the illumination of light, the photocatalyst will produce photocatalytic reaction similar to photosynthesis, which can produce free hydroxyl groups and active oxygen with strong oxidizing ability. It has strong redox function and can oxidize and decompose various organic compounds and some inorganics. A protein that destroys bacterial cell membranes and solidifies viruses, kills bacteria and decomposes organic pollutants, and decomposes organic pollutants into non-polluting water (H2O) and carbon dioxide (CO2), thus extremely sterilizing and removing Stinky, anti-mildew, anti-fouling and self-cleaning, purifying air function. The photocatalyst is characterized in that it utilizes oxygen molecules and water molecules in the air to convert the organic matter it contacts into carbon dioxide and water, and the substance that does not change itself, but promotes chemical reaction, can be used theoretically for a permanent use, and the maintenance cost is low. At the same time, the titanium dioxide contained therein is non-toxic and harmless, and has been widely used in various fields such as food, medicine, cosmetics, and the like. The main reaction mechanism of the photocatalyst is that when the nano-sized titanium dioxide ultra-fine particles are irradiated with ultraviolet light having a wavelength of 388 nm or less, the inside thereof is excited by the absorption of light energy to generate electron-hole pairs, that is, photo-generated carriers, and then rapidly migrate to the surface thereof. Activated oxygen and water molecules are activated to produce active free hydroxyl (.OH) and reactive oxygen species. When the contaminants and bacteria adsorb to their surface, chain degradation reactions occur. Photocatalysts are widely used in the following fields: living room, office building, conference room, hotel, internet cafe, cinema, hotel, KTV, etc.; transportation system of cars, trains, subways, airplanes, ships, Vehicles such as elevators; hospitals, health centers, health centers, outpatient departments, emergency centers, epidemic prevention stations, etc.; educational system school classrooms, collective dormitories, training centers, auditoriums, canteens, science museums, libraries, etc.; Application as a raw material combined with the development of various industrial products, such as building materials (ceramics, coatings, glass), household appliances (air conditioners, refrigerators, telephones, washing machines, lighting appliances, air purifiers), textile materials (cotton fabrics, fibers, Photocatalyst masks, etc.), crafts, etc. Photocatalyst can remove all organic pollutants such as formaldehyde, benzene and toluene at low concentrations, and mineralize some inorganic pollutants such as nitrogen monoxide (NO), nitrogen dioxide (NO2) and sulfur dioxide (SO2). ), etc., with efficient air purification, odor removal. It has strong antibacterial effect on microorganisms, and can effectively kill Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Pseudomonas aeruginosa, etc. (antibacterial rate is over 99.99%); photocatalyst It does not contain any heavy metal elements, does not have any chemical toxicity, and is completely safe and reliable to the human body during use. The thorough removal of trace pollutants from the cleaned environment is difficult to replace by other means.
Photocatalyst Application in Air Purify