Special functions of nano titanium dioxide

Nano titanium dioxide (TiO2), as a new type of photocatalyst, UV resistant agent and photoelectric effect agent, will display broad application prospects in the fields of antibacterial, mildew proof, exhaust purification, deodorization, water treatment, antifouling, weathering, anti-aging, automobile topcoat and so on With the development of industrial production and functional application of its products, it will play an important role in the technological revolution in the fields of environment, information, materials, energy, medical and health Due to the characteristics of TiO2 electronic structure, the antibacterial and anti mildew mechanism of nano-TiO2 can generate superoxide anion radicals and oxyhydrogen radicals with strong chemical activity when exposed to light, which attack organic matters and degrade organic pollutants When encountering bacteria, it directly attacks the cells of bacteria, causing the degradation of organic matter in the cells of bacteria, so as to kill bacteria and make them decompose Commonly used fungicides such as silver and copper can make bacterial cells inactive, but after bacteria kill, the body releases toxic components such as endotoxin Nano titanium dioxide can not only affect the bacterial fecundity, but also destroy the cell membrane structure of bacteria, so as to completely degrade bacteria and prevent the secondary pollution caused by endotoxin Nano titanium dioxide is an insoluble material, which can degrade organic pollutants and kill bacteria, but also can not decompose and dissolve itself, has a long-term photocatalytic effect, and has a long-term sterilization and degradation of pollutants Effect As nano materials, in addition to meeting the requirements of nano size, they must also have functionality and application TiO2 with nanometer scale distribution can fully reflect quantum size effect, surface effect, volume effect and macro quantum tunneling effect, so it has a series of special application characteristics, such as antibacterial, air purification, sewage purification, etc In the field of nano titanium dioxide application, there are various harmful bacteria in people's living environment, which have a bad impact on human life Various building decoration materials in the room, such as wood-based panel, wood composite floor, laminated wood panel furniture and adhesives, will emit toxic pollutants such as formaldehyde, halogenated hydrocarbon and aromatic hydrocarbon, which will harm human health If nano titanium dioxide is added to the interior wall coating, floor covering materials, wall decoration materials, furniture finish and other materials, it can not only kill bacteria and mildew, but also degrade organic pollutants, so that people live in a healthy environment In addition, the antibacterial plastics with about 1% nano titanium dioxide can be widely used in food packaging, electrical appliances, furniture, tableware, public facilities, etc to prevent the multiplication and cross infection of bacteria Antibacterial fiber can be used to make medical products, health textiles and so on, which can resist bacteria and deodorize, so as to provide safe and effective health care functions TiO2 photocatalysis technology has the advantages of simple process and low cost It can catalyze the decomposition of bacteria and pollutants by using natural light, normal temperature and pressure It has the characteristics of high activity, no secondary pollution, no stimulation, safety and non-toxic, good chemical stability and thermal stability It is one of the most promising green environmental protection catalysts The treatment of organic wastewater with nano-TiO2 photocatalyst can effectively detoxify, decolorize and mineralize the halogenated aliphatic hydrocarbon, halogenated aromatic hydrocarbon, nitroaromatic hydrocarbon, polycyclic aromatic hydrocarbon, phenols, dyes and pesticides, and finally degrade them into carbon dioxide and water At present, the research in this field has made progress, and photocatalytic degradation of wastewater will become an effective treatment method Using the excellent ultraviolet shielding and high weather resistance of rutile nano titanium dioxide, as well as the photocatalytic effect to degrade oxides (NOx) and sulfur oxides (SOx), etc., it can also effectively control the air pollution caused by industrial exhaust gas and automobile exhaust emission Its principle is to carry out the oxidation-reduction reaction of organic or inorganic pollutants to generate water, carbon dioxide, salt, etc And clean the air The results show that the nano titanium dioxide photocatalytic air purification coating, ceramics and other materials have a good prospect in eliminating nitrogen oxides In addition, nano titanium dioxide has been widely used in magnetic materials, light colored conductive materials, gas sensors, humidity sensors and other fields With the deepening of application research, its application field will be more and more extensive At present, the production and application of nano titanium dioxide in China is still in the primary stage of development The author believes that the research in this field should start with solid basic theoretical research, advocate multi-disciplinary cooperation, and develop to a deeper and higher level, so that it has a broader application field.