Preparation of titanium oxide photocatalyst film The titanium oxide photocatalyst film is usually coated on quartz glass or soda lime glass, and is applied to paper or brick in other fields. The film forming method includes a spray method, a dipping method, a sputtering method, and the like. The spraying method is to form a titanium oxide film by a spraying method on a heated substrate by using a titanium salt solution dissolved in an ethanol solution or an organic titanium compound solution dissolved in an organic solvent when the furnace temperature reaches 300 to 600 ° C; Immersing the glass bottom plate in a pre-formed immersion liquid of titanium alkoxide or ethyl acetate dissolved in an organic solution, and elevating it to a strictly managed atmosphere at a certain speed for drying for a certain period of time, and then sintering into a film; The shooting method is to collect the sputtered material in the vicinity of the surface of the sputtering crucible by a magnetic field in the form of a high-density plasma, and to obtain a uniform film of a large area at a high speed. A schematic diagram of a transparent film of titanium oxide. The quasi-transparent photocatalyst glass with a light transmittance of 80% developed by the University of Tokyo and the company of Cao Da was successfully put into practical use.
Manufacture of titanium oxide transparent film 3 Photocatalyst light source Titanium photocatalyst film can only have photocatalytic effect under ultraviolet radiation of 350-400 nm. For various lighting fixtures installed outdoors, there is sufficient ultraviolet light due to sunlight. Irradiation, so any light source in the luminaire, including a source that does not emit ultraviolet light, can be used.
The photocatalytic effect of the phosphor-coated lamp is also related to the type of phosphor and the amount of powder. For example, a three-wavelength fluorescent lamp has a higher conversion efficiency than an ultraviolet light-phosphor of an ordinary fluorescent lamp, and the effect of the photocatalyst is low. Since the low-pressure sodium lamp and the liquid crystal display emit almost no ultraviolet light; the device coated with the photocatalyst does not have a photocatalytic effect when the lamp is used to ignite indoors. Ultraviolet light emission is used in the ignition points of high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps. As a light source of the photocatalyst, there is a significant photocatalytic effect even when used indoors.
The mechanism of photocatalyst-adsorbent mixture, street lighting in street lighting usually installs the light source into the luminaire and is installed on the elevated frame. The luminaire consists of a curved glass cover and a lamp housing, which can withstand the sun and rain and is durable. After a long period of time, the street lamp often has a layer of dirt on the glass cover, which gives the driver and surrounding residents a dirty visual impression, and the light output of the street lamp is also greatly reduced. Now through the street lamp experiment of photocatalyst film, the glass lamp cover and the casing with 3% inclination angle are partially coated with photocatalyst material, and some are not coated with photocatalyst material. After 15 months of use, the effect of road light catalyst can be seen. The part directly exposed to sunlight on the lamp housing is smooth and free of dirt, and there is also a photocatalytic effect in the horizontal portion of the lamp cover, but there is dirt on the lower part of the lamp cover, because the part of the sun is not exposed to the sun, and the dust is drenched after the rain Caused by the accumulation of stagnation.
The use of photocatalyst tunnel illumination device for photocatalyst changes in the transmittance of glass. 5 The oxidation and deodorization application of thermal catalysts, in addition to the decontamination and deodorization applications of photocatalysts, recently promoted the oxidation and deodorization of thermal catalysts in home appliances. Here is a brief introduction. The thermal catalyst oxidation method is a deodorization method in which an odor is decomposed into CO 2 and water at a relatively low temperature of 300 to 400 ° C using a catalyst such as platinum, palladium, nickel or cobalt. In order for this catalyst to function, the catalyst must undergo activation treatment and maintain the temperature of the catalyst.
Conclusion The more widely used applications of catalytic technology, in addition to the application of catalysts in the oxidation and deodorization of infrared heater writers, the application of photocatalyst in the field of lighting has also entered the practical stage. This paper mainly introduces the reaction characteristics, manufacturing methods, various light sources and lighting places of photocatalyst films represented by titanium oxide. The application of photocatalyst technology on traffic lights is a typical application. In addition to purifying air and sterilizing, it can also remove dirt on lighting fixtures, improve the light transmittance of lamps and direct illumination of roads, ensure normal traffic and safety, and save lighting. The cleaning and maintenance costs of lamps have broad application prospects. At present, the application of photocatalytic technology in lighting fixtures has not yet begun in China. In order to improve the optical performance of lighting devices, reduce pollution and protect the environment, we should pay attention to the application of photocatalyst technology in lighting devices, and strengthen research and popularization applications.
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