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1、1Analysis of nano-TiO2 photocatalyst materials to be used in the field of howKeywords field, building materials, application, analysis, nano, how to, TiO2, paint, glass, oxygen TiO2 is an n-type semiconductor material, its band gap 3.2ev (anatase), when it is less than or equal to 387.5nm by the wav
2、elength of light (UV) irradiation, the valence band of the electron-photon will be energy and the transition to the conduction band, the formation of photo-electron (e-); and the valence band corresponding to the formation of photogenerated holes (h +), shown in Figure 1. TiO2 surface electron optic
3、al dissolved oxygen and other e-susceptible oxidizing substances are captured, while the hole h + can be adsorbed on the TiO2 surface oxidation of organic matter or the first adsorbed on the TiO2 surface oxidation of OH-and H2O into OH radicals, OH radicals can react with 402.8MJ/mol , can damage th
4、e organic matter in the CC, CH, CN, CO, NH bond, and thus has the ability to efficiently decompose organic matter, a bactericidal, deodorant, photocatalytic degradation of organic 2pollutants in the function. Second, the characteristics of nano-TiO2 photocatalyst Nano-TiO2 with high photocatalytic a
5、ctivity, the adsorption capacity is also strong, with full exposure to pollutants is more, they are great extent adsorbed on the particle surface. Main features are: (1) the role of broad-spectrum, in the light catalytic reaction process, not only can damage the biological factors, but also can dest
6、roy a variety of organic substances; (2) in the photocatalytic reaction process, the reaction of titanium dioxide does not participate, only play a catalytic role of the media, does not in itself with time consuming, Therefore, a lasting life; (3) Process through nanotechnology catalyst, may contain
7、 a weak ultraviolet light, natural light, sunlight and other light sources play a role; (4) completely harmless, because titanium dioxide itself does not release harmful material and the reaction itself does not participate in the reaction process will be the role of the material is completely oxidi
8、zed into harmless carbon dioxide and water and other harmless substances, so the role of photocatalyst completely harmless to the 3environment. Third, the field of nano-TiO2 photocatalyst in building materials in the application (A) the photocatalyst coating 1 anti-bacterial coating In recent years,
9、 with the strengthening of peoples environmental awareness, green paint coatings industry has become the mainstream of development, water-based paint as the main species has also been considerable development, but its mold, bacteria problems are more prominent, such as during storage mildew, bacteri
10、a make long lower quality paint, mildew in the applicator after the film, making a long-coated bacteria are aging, the appearance of stained, and even cracking, peeling, so the loss of the original paint protection and decorative features. Under nano-TiO2 photocatalysis decomposition of pathogens an
11、d toxins with function, as a new type of additives used in bactericidal coatings, given the product durable, long-lasting anti-bacterial, bactericidal capacity, new attention is being mineral functional materials 1. Nano-TiO2 coating of titanium dioxide compared with 4the traditional, to overcome th
12、e anti-bacterial products, broad-spectrum resistance, heat resistance and defects in processing and other aspects, an important value. Rui-Fen Xu et al 2 laboratory-made anti-bacterial nano-TiO2 added to benzene - acrylic emulsion, the surface treatment of antibacterial nano-TiO2 in the emulsion can
13、 be uniformly dispersed, can take advantage of the bactericidal effect of nano-TiO2. TiO2 nanoparticles not only has the ability to break down bacteria, the bacteria can effectively break down the toxins released from the Tokyo University of grant Akira Fujishima 3 on the glass coated with a thin la
14、yer of TiO2, irradiation to kill E. coli 3h reaching effects , toxin levels controlled at 5% or less. In addition, nano-TiO2 itself non-toxic, odorless, harmless to human security, anti-bacterial nano-TiO2 coating can be coated on the hospital wards, operating rooms and other places on the walls, ca
15、n be quickly eliminated bacteria play a sterilization effect. (2) air purification coatings Urban atmosphere 5of nitrogen oxides (NOx) and sulfur oxides (SOX) of pollution, environmental protection has become a serious problem one study, the preparation of nano-TiO2 photocatalytic air purification g
16、reen paint, the use of TiO2 photocatalysts produce active oxygen, and with the role of rainwater into these pollutants can be HNO3, H2SO4 and get rid of. In other countries, nano-TiO2 photocatalysis in the application has been rapid development, General Motors Corporation Donald Beek Japanese study nano-TiO2 to remove such vehicle exhaust (including H2S) sulfur capacity at 500 under the conditions by the exhaust from a car after 7h The total sulfur removal
