Nano titanium dioxide (TiO2) as a new type of photocatalyst, anti-ultraviolet agent, photoelectric effect agent, etc., with its magical function, will be in antibacterial and anti-mildew, exhaust purification, deodorization, water treatment, anti-pollution, weathering and anti-aging, automotive Topcoats and other fields show broad application prospects. With the maturation of its industrialized production and functional applications, it will play an important role in the technological revolution in the fields of environment, information, materials, energy, medical care and health.
Antibacterial and antibacterial mechanism of nano titanium dioxide
Due to the characteristics of the electronic structure of TiO2, when it is exposed to light, superoxide anion radicals and hydroxyl radicals, which are highly chemically active, are generated to attack organic substances and degrade the organic pollutants. When bacteria are encountered, they directly attack the bacteria's cells, causing degradation of the organic matter in the bacteria's cells, which kills the bacteria and causes them to break down. Commonly used fungicides such as silver and copper can inactivate bacterial cells, but after the bacteria are killed, the body releases endotoxins and other harmful components. Nano-titanium dioxide not only can affect the fertility of bacteria, but also can destroy the cell membrane structure of bacteria to completely degrade the bacteria and prevent secondary pollution caused by endotoxin. Nano-titanium dioxide is a non-dissolution type material, which degrades organic pollutants and kills bacteria while killing , It does not decompose or dissolve, it has a long-lasting photocatalytic effect and it has a long-lasting effect of sterilizing and degrading pollutants.
As nanomaterials, in addition to satisfying the requirements of nanometer size, they must also be functional and applicable. The nanoscale distribution of TiO2 can fully reflect the quantum size effect, surface effect, volume effect and macroscopic quantum tunneling effect, and therefore has a series of special application characteristics of nano-particles, such as antibacterial, air purification, and sewage purification.
Nano titanium dioxide applications
In people's living environment, there are various harmful bacteria that have adverse effects on human life. Indoor decoration of various building materials, such as wood-based panels, wood laminate flooring, laminate wood furniture and adhesives will emit formaldehyde, halogenated hydrocarbons, aromatic hydrocarbons and other toxic pollutants, endanger human health. If titanium dioxide is added to the interior wall paint, floor covering materials, wall decoration materials, furniture finishes and other materials in buildings, it will not only kill bacteria but also degrade organic contaminants and make people live in a healthy and healthy environment.
In addition, the addition of about 1% nano titanium dioxide antimicrobial plastic can be widely used in food packaging, electrical appliances, furniture, tableware, public facilities, etc., in order to prevent the breeding of bacteria and cross-infection. Antimicrobial fiber can be used to make medical supplies, and it can also produce antibacterial and deodorant health-care textiles, sanitary textiles, etc. to provide safe and effective health care functions.
TiO2 photocatalysis technology is simple, low cost, natural light, normal temperature and pressure can be used to catalyze the decomposition of pathogens and pollutants, with high activity, no secondary pollution, no stimuli, safe, non-toxic, chemical stability and thermal stability Good features are one of the most promising green environmental protection catalysts. The use of nano-TiO2 photocatalysts to treat organic wastewater can effectively detoxify, decolorize, and mineralize halogenated aliphatic hydrocarbons, halogenated aromatic hydrocarbons, nitroaromatic hydrocarbons, polycyclic aromatic hydrocarbons, phenols, dyes, and pesticides in water. Carbon dioxide and water, the current research in this area has made progress, photocatalytic degradation of sewage will become an effective means of treatment.
Utilizing rutile-type nano-titanium dioxide for UV screening and high weather resistance, as well as photocatalytic effect to degrade oxides (NOX), sulfur oxides (SOX), etc., can also effectively control the atmosphere caused by industrial exhaust gas and automobile exhaust emissions. Pollution, the principle is to redox organic or inorganic pollutants, generate water, carbon dioxide, salt, etc., thus purifying the air. The research results show that nano titanium dioxide photocatalytic air purification coatings, ceramics and other materials have good prospects in the application of elimination of nitrogen oxides.
In addition, nano-titanium dioxide has been well applied in the fields of magnetic materials, light-colored conductive materials, gas sensors, humidity sensors, and the like. With the deepening of applied research, its application areas will become more and more extensive.
At present, the production and application of domestic nano-titanium dioxide is still in the initial development stage. The author believes that research in this area should begin with a solid foundation of theoretical research, promote multidisciplinary collaboration, and develop at a high level of depth, so that it has a broader application area.
Antibacterial and antibacterial mechanism of nano titanium dioxide
Due to the characteristics of the electronic structure of TiO2, when it is exposed to light, superoxide anion radicals and hydroxyl radicals, which are highly chemically active, are generated to attack organic substances and degrade the organic pollutants. When bacteria are encountered, they directly attack the bacteria's cells, causing degradation of the organic matter in the bacteria's cells, which kills the bacteria and causes them to break down. Commonly used fungicides such as silver and copper can inactivate bacterial cells, but after the bacteria are killed, the body releases endotoxins and other harmful components. Nano-titanium dioxide not only can affect the fertility of bacteria, but also can destroy the cell membrane structure of bacteria to completely degrade the bacteria and prevent secondary pollution caused by endotoxin. Nano-titanium dioxide is a non-dissolution type material, which degrades organic pollutants and kills bacteria while killing , It does not decompose or dissolve, it has a long-lasting photocatalytic effect and it has a long-lasting effect of sterilizing and degrading pollutants.
As nanomaterials, in addition to satisfying the requirements of nanometer size, they must also be functional and applicable. The nanoscale distribution of TiO2 can fully reflect the quantum size effect, surface effect, volume effect and macroscopic quantum tunneling effect, and therefore has a series of special application characteristics of nano-particles, such as antibacterial, air purification, and sewage purification.
Nano titanium dioxide applications
In people's living environment, there are various harmful bacteria that have adverse effects on human life. Indoor decoration of various building materials, such as wood-based panels, wood laminate flooring, laminate wood furniture and adhesives will emit formaldehyde, halogenated hydrocarbons, aromatic hydrocarbons and other toxic pollutants, endanger human health. If titanium dioxide is added to the interior wall paint, floor covering materials, wall decoration materials, furniture finishes and other materials in buildings, it will not only kill bacteria but also degrade organic contaminants and make people live in a healthy and healthy environment.
In addition, the addition of about 1% nano titanium dioxide antimicrobial plastic can be widely used in food packaging, electrical appliances, furniture, tableware, public facilities, etc., in order to prevent the breeding of bacteria and cross-infection. Antimicrobial fiber can be used to make medical supplies, and it can also produce antibacterial and deodorant health-care textiles, sanitary textiles, etc. to provide safe and effective health care functions.
TiO2 photocatalysis technology is simple, low cost, natural light, normal temperature and pressure can be used to catalyze the decomposition of pathogens and pollutants, with high activity, no secondary pollution, no stimuli, safe, non-toxic, chemical stability and thermal stability Good features are one of the most promising green environmental protection catalysts. The use of nano-TiO2 photocatalysts to treat organic wastewater can effectively detoxify, decolorize, and mineralize halogenated aliphatic hydrocarbons, halogenated aromatic hydrocarbons, nitroaromatic hydrocarbons, polycyclic aromatic hydrocarbons, phenols, dyes, and pesticides in water. Carbon dioxide and water, the current research in this area has made progress, photocatalytic degradation of sewage will become an effective means of treatment.
Utilizing rutile-type nano-titanium dioxide for UV screening and high weather resistance, as well as photocatalytic effect to degrade oxides (NOX), sulfur oxides (SOX), etc., can also effectively control the atmosphere caused by industrial exhaust gas and automobile exhaust emissions. Pollution, the principle is to redox organic or inorganic pollutants, generate water, carbon dioxide, salt, etc., thus purifying the air. The research results show that nano titanium dioxide photocatalytic air purification coatings, ceramics and other materials have good prospects in the application of elimination of nitrogen oxides.
In addition, nano-titanium dioxide has been well applied in the fields of magnetic materials, light-colored conductive materials, gas sensors, humidity sensors, and the like. With the deepening of applied research, its application areas will become more and more extensive.
At present, the production and application of domestic nano-titanium dioxide is still in the initial development stage. The author believes that research in this area should begin with a solid foundation of theoretical research, promote multidisciplinary collaboration, and develop at a high level of depth, so that it has a broader application area.
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