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It is believed that the theoretical basis of nano-TiO 2 as a photocatalyst is: the absorption edge migration caused by the quantum size confinement; the spectral absorption and emission behavior structuring caused by the scattering energy level and transition; compared with the semiconductor material, the quantum well The hot carrier cooling rate decreases, and the quantum yield increases. The quantum size effect of nano-TiO 2 causes the conductive and valence power levels to change to different energy levels, the energy gap becomes wider, and the conduction potential becomes more negative. The valence potential becomes more positive. This gives it a stronger redox capacity, which is very advantageous for the catalytic reaction.
In the space of human life, there are a variety of microorganisms. Among these microorganisms, there are a large number of pathogenic bacteria, which can directly cause human diseases, and can also decompose human and animal metabolites into various low-grade fatty acids and amines. The odorous volatile compounds, together with the secretions of the bacteria themselves and the volatilized gases of the rot, release a disgusting odor. How to kill harmful bacteria in the air and remove bad odor is also an important task of air purification. Since the bacteria are composed of organic matter and the like, the nano-TiO 2 photocatalyst has a very strong oxidizing ability under the action of light, and can directly oxidize and destroy the components in the cell wall, the cell membrane or the cells to generate CO 2 and H 2 . O, thereby killing bacteria and eliminating malodor in a short time. Experiments show that the photocatalytic action of TiO 2, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus yellow, Salmonella, Aspergillus and Verticillium teeth and so has a strong ability to kill. It can be used in hospital operating tables and walls, bathtubs, tiles and toilets. Japan has applied the bactericidal properties of nano-TiO 2 to tableware, which greatly reduces the possibility of disease-borne diseases in tableware.
The antibacterial and antifungal mechanism of nano-TiO 2 is: due to the characteristics of the electronic structure of TiO 2 , it generates chemically active superoxide anion radicals and hydroxyl radicals when exposed to light, attacking organic matter and achieving degradation. The role of organic pollutants. 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. Commonly used fungicides such as silver and copper can inactivate bacterial cells, but after the bacteria are killed, the body releases harmful components such as endotoxin. Nano-TiO 2 can not only affect the bacterial fecundity, but also destroy the cell membrane structure of bacteria, to completely degrade bacteria and prevent secondary pollution caused by endotoxin. Nano-TiO 2 is a non-dissolving material. It decomposes organic pollutants and kills bacteria. It does not decompose and dissolve itself, has long-lasting photocatalysis, and has long-lasting sterilization and degradation of pollutants.
Since the nano TiO 2 structure has high ultraviolet absorbing property, the electron-hole pair can be separated more effectively, and the amount of active oxygen species generated is more, so that the photon yield is higher, so that the cancer cells are inactivated, The effect of killing gastric cancer cells is obvious. Zhang Aiping other anatase titanium coated with a TiO 2 catalyst was prepared, under ultraviolet light (300 ~ 400nm), destruction of photocatalytic oxidation rate of 80% of gastric cancer cells.
Japan's Nagoya Institute of Industrial Technology has developed a safe nano-TiO 2 dental bleach. Teeth will become black and yellow due to pathological changes, smoking, drinking tea, etc., thus affecting the appearance. To date, the teeth use a high concentration of H 2 O 2 bleach, but this will damage the enamel on the tooth surface to varying degrees. TiO 2 nanoparticles using characteristics of the light labile, sodium silicate with magnesium as a tackifier, a trace amount of TiO aqueous H 2 O 2 2 and is made of a low concentration of a novel dental bleaching agent. This bleaching agent was applied to discolored teeth and irradiated with light having a wavelength of 400 nm, resulting in a good bleaching effect without damaging the enamel.