Antibacterial mechanism of nano titanium dioxide

Nano Titanium white powder product lasting antibacterial effect, the mechanism is different from the general inorganic and organic antimicrobial agent, and not by bleeding free drug antibacterial effect is generated, but in photocatalysis. After absorbing light energy, the particles generate electron-hole pairs, and the generated electron-hole pairs migrate very fast, quickly reach the surface of the nanoparticles, and react with water and air adsorbed on the surface, such as O ₂ +e→.O ^- ₂ and H. ₂ O+e ^- →.OH+H ^-, etc., generates highly reactive hydroxyl radicals (·OH) and superoxide anion radicals (·O ₂ ^- ), attacking organic matter. When bacteria are encountered, the cells of the bacteria are directly attacked, causing the organic matter in the bacterial cells to degrade, thereby killing the bacteria and decomposing them.
The general nano titanium dioxide product must have ultraviolet light to excite electrons to generate electron-hole pairs, which acts as an antibacterial and decomposes organic pollutants. The excitation light source is only limited to the ultraviolet light source, which makes the application of the product limited, and it is difficult to obtain a good photocatalytic oxidation effect. At present, inorganic and organic multi-layer surface coating technology has been adopted to develop nano titanium dioxide powder series products with broad antibacterial spectrum, strong antibacterial power, no discoloration and low cost. The product is characterized in that as long as there is a natural light source, whether it is a long-wave source or a short-wave source, it can be used as an excitation source for the nano-titanium white photocatalyst, so that the material acts as an antibacterial and degrading organic pollutant. When the nano titanium dioxide with high safety is sterilized, the electron-hole pair is activated to activate the surface adsorbing substance, and a strong oxidizing agent and a strong reducing agent are generated to attack the bacterial organism and play a bactericidal action. Commonly used fungicides such as silver and copper can inactivate bacterial cells, but after the bacteria are killed, the corpse can release seven harmful components, such as endotoxin, which can affect not only the bacterial fertility, but also It can attack the outer layer of bacterial cells, penetrate the cell membrane, destroy the cell membrane structure of the bacteria, completely degrade the bacteria, and further prevent the endotoxin from causing secondary pollution.
The toxicity test of nano titanium dioxide was tested by the disinfection testing center of the Chinese Academy of Preventive Medicine. The results are as follows:

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