What is photocatalysis?
What is photocatalysis?
Photocatalyst [PHOTOCATALYSIS] is a compound of light [Photo=Light] + catalyst (catalyst) [catalyst]. Photocatalyst is a kind of substance that can not promote change under the illumination of light, but can promote chemical reaction. Photocatalyst uses the energy of natural light to convert into the energy required for chemical reaction to produce catalysis to make the surrounding oxygen and Water molecules are excited into freely negative ions that are highly oxidizing. Almost all organic substances and some inorganic substances harmful to the human body and the environment can be decomposed, which not only accelerates the reaction, but also uses the natural world to determine the waste of resources and additional pollution. A representative example of zui is the "photosynthesis" of plants, which absorbs carbon dioxide that is toxic to animals and uses light energy to convert into oxygen and water.
Twilight Catalyst was discovered in 1967 by Professor Fujishima Sho, who was a graduate student at the University of Tokyo. In a test, a single crystal of titanium oxide placed in water was irradiated with light, and it was found that water was decomposed into oxygen and hydrogen. This effect is known as the "Honda-Fujishima Effect", which combines the name of Professor Fujishima and his then instructor, the president of Tokyo University of Technology, Bento Kenichi.
Since titanium is promoted by the force of light, the titanium oxide in this phenomenon is called a photocatalyst. This phenomenon is equivalent to the conversion of light energy into chemical energy. At the time of the oil crisis, the world’s expectations for new energy sources were very strong. Therefore, this technology has attracted attention as an epoch-making method for extracting hydrogen from water. Since it is difficult to extract a large amount of hydrogen in a short period of time, the development of the new energy source cannot be realized after all, so the temperature is rapidly cooled after a sensation.
î ‹î ‹The 1992 International Conference on Titanium Dioxide Photocatalyst was held in Canada. Japanese research institutes published many new ideas about photocatalyst and proposed research results for nitrogen oxide purification. Therefore, the number of patents related to titanium dioxide is also large, and other catalyst related technologies cover the process of catalyst polymerization, catalyst structure, catalyst carrier, catalyst fixing method, and catalyst performance test. Taking this as an opportunity, the research on the application of photocatalyst in the fields of antibacterial, antifouling, and air purification has increased dramatically. From 1971 to June 2000, a total of 10,717 photocatalyst related patents were filed. The wide application of titanium dioxide photocatalyst will bring people a clean environment and a healthy body.
The length of the î ‹î ‹ object is called micrometer (mm), and 10 -9 meters is called nanometer (nm). Various application materials will also gradually enter the nano age from micron. The nanomaterial consists of particles with a size of 1 to 100 nm. The particle size is extremely fine, has a very large specific surface area, and as the particle size decreases, the surface atomic percentage increases. A phenomenon of high surface energy due to incompleteness of a large number of atomic coordinates on the surface. The ratio of surface energy to total energy is greatly increased, and the nanomaterial has characteristics such as adsorption, light absorption, and melting point change. Using the technology and characteristics of nano-ultrafine particles, we have developed a material that does not participate in the reaction at all, but promotes and enhances the reaction energy. The catalytic technology that catalyzes the target reaction has been applied to environmental cleaning to promote the reaction of harmful or toxic substances. Become a stable and harmless substance and achieve environmental protection.
Nano-TiO2 Photocatalyst is a substance that does not change itself under the illumination of light, but can promote chemical reactions, just like the chlorophyll in photosynthesis of plants. Photocatalyst can produce antibacterial, deodorizing, oily decomposition, mildew proof, algae-proof and air purification under the illumination of sunlight or indoor fluorescent lamps.
Photocatalytic reaction of photocatalyst
î ‹
Photocatalyst
Antibacterial: Kill E. coli, Staphylococcus aureus, Klebsiella pneumoniae,
绿 Pseudomonas aeruginosa, virus, etc.
î ‹Air purification: Decompose organic compounds and toxic substances in the air: benzene, formaldehyde, ammonia, TVOC, etc.
Deodorization: Remove stench of cigarette odor, garbage smell, life odor.
î ‹Moldproof and anti-algae: Prevent mold, prevent algae, and prevent scale adhesion.
î ‹ Anti-fouling and self-cleaning: Decompose oil and clean itself.
Photocatalyst characteristics
î ‹ 1. Security
As a food and drug additive, it is certified by the US FDA and is very safe to use.
î ‹ 2. Persistence
î ‹î ‹Because the photocatalyst only provides a place for reaction, it does not participate in the chemical reaction itself, so its effect is long-lasting.
Photocatalyst application
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