1.Degrade harmful organic matter in the atmosphere
With the advancement of human science and technology, industrial development has become increasingly large, and it has also brought serious air pollution problems, among which serious pollutants are N0, H2s, and SO. , Volatile Organic Compounds (VOCS), etc., they can cause a series of major disasters such as photochemical smog, acid rain, ozone layer destruction. How to degrade these harmful substances has aroused the attention of all mankind. Nano TiO2 in purple
Under the irradiation of external light, the adsorbed NO, H2S, s0: etc. on the surface of the catalyst can be decomposed. The researchers loaded TiO2 on activated carbon fAc1, and under suitable conditions, the purification rate of low-concentration NOx reached 90%. And the photocatalytic oxidation method can decompose the organic matter in the atmosphere into carbon dioxide water and other inorganic matter under normal conditions. Measured through experiments, when the pH=7 formaldehyde solution is 40mg/L, the degradation rate of TiO2 with a ratio of TiO2 anatase to rutile of 1:15g/l to formaldehyde in newly renovated houses reaches 96.72%; TiO2 is used for Five pollutants of benzene, ethylbenzene, o-xylene, meta-xylene, and p-xylene undergo photocatalytic oxidation within the range of air humidity, and the degradation rate is nearly 100% without causing secondary pollution.

2.Treatment of organic sewage

Water pollution is widespread in all industries, mainly chemical wastewater, printing and dyeing wastewater, oily wastewater, organic pesticides and other pollution. The compounds that cause sewage are complex and have a wide variety, mainly including phenols, aromatic hydrocarbons, heterocycles and their derivatives, etc. These pollutants have a large content and are highly toxic. It has always been a difficult problem in the sewage treatment process. Nano-TiO2 has a large specific surface area. By fully contacting wastewater, organic matter can be adsorbed to a large extent. At the same time, relying on its strong oxidizing ability under photocatalytic conditions, it can quickly oxidize and degrade organic matter. Some scholars use TiO2 composite powder to dye dyes. Degradation of compounds, that is, dye compounds absorb photons to form an excited state under visible light irradiation. The dye molecules in the excited state can be injected into the conduction band of TiO2

One electron generates a positive carbon radical by itself, and the electron injected into the conduction band interacts with O adsorbed on the surface of TiO2 to generate 02_, which further forms active radicals such as HO0. Active free radicals attack the positive carbon free radicals of the dye to form hydroxyl compounds, which are oxidized to generate small molecules. Make the degradation rate of dye wastewater reach 74.7%.

3.Degradation of domestic waste and medical sterilization

Degradation and treatment of domestic waste, but biodegradation cannot degrade all substances, and the strong oxidizing property of TiO2 is almost non-selective to the degradation of all organic substances. It can degrade some biodegradable substances such as pigments, COD, etc., which are difficult to degrade. This treatment method is not only It is fast, effective and economical and effective in alleviating the huge pressure on the environment caused by municipal waste. The application principle of TiO2 in the medical field is also based on its own semiconductor photocatalytic properties. TiO2 photocatalyst has bactericidal ability against Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus.

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