Method for improving photocatalysis function of nano film using optical interference method

A nano-film, photocatalytic technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems affecting photocatalytic efficiency, poor stability, easy hole-electron recombination, etc.

Inactive Publication Date: 2009-08-05
陆晓唯
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the hole-electron pairs generated by the excitation of visible titanium oxide above have a strong oxidation function, they have their disadvantages: (1) wide band gap light absorption is limited to the ultraviolet region; (2) holes-electrons are easily recombined and affected Photocatalytic efficiency
In addition, dye sensitization can also be added to improve visible light absorption, but the stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Single-material silver-doped titanium dioxide coating method: the absorption wavelength of silver-doped nano-film is 365-413nm. Considering the use of visible light as much as possible, 410nm can be selected as the design wavelength λ, and the quarter wavelength is 102.5nm. According to the principle of optical interference, we'd better choose the optical thickness of the film layer to be 205nm, 410nm, 615nm, 820nm... In actual film production, because the film layer is too thin, the photocatalytic effect is not very good, and the effect should be improved layer by layer. When the film layer is gradually thickened to 410nm, the first best effect appears; if the thickness continues to increase, the photocatalytic effect will decline again. decline…….

[0039] When the optical thickness of the film layer is 410nm or 615nm, the photocatalytic sterilization rate (irradiated by 20W fluorescent lamp for 2 hours) can reach about 90%.

Embodiment 2

[0041] The multilayer interference film of this embodiment is composed of titanium dioxide and silicon dioxide interference films.

[0042] According to TiO 2 and SiO 2 Solution Formulation Using TiO 2 —SiO 2 —TiO 2 ......—SiO 2 —TiO 2 High reflection film system design, each layer is coated with λ 0 (650nm) quarter thickness, that is, the optical thickness of each layer is 162.5nm, usually coated with 7 layers; in addition, the outermost layer of TiO 2 It can also be doubled, that is, twice as thick as 162.5nm (325nm). The light transmission of this kind of film is blue and the reflection is golden yellow.

[0043] The photocatalyst film prepared in this example is irradiated with the above-mentioned light source, and the sterilization rate can reach about 98% in less than two hours.

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Abstract

The invention relates to a method for improving the function of photocatalysis of a nanofilm by the principle of interference of light. The method is to coat a nanometer material with the function of photocatalysis on a substrate material according to a certain optical thickness to prepare the film with a nanometer structure, wherein the nanofilm is made of a single material layer or two materials alternately; and when the nanofilm is coated, the substrate material to be coated makes relative motion with a colloid solution, the coating speed is at about 0.02 to 2.0cm/s, each film is baked for 3 to 20 minutes at a temperature of between 400 and 550 DEG C, and the other layer is coated when the film is cooled to room temperature. The method uses the relative motion of the surface of the colloid solution and the substrate material to achieve film thickness control, and the prepared photocatalyst nanofilm is more useful to prepare a film which sterilizes and degrades harmful gases and has certain requirement on transparency.

Description

technical field [0001] The invention relates to a method for improving the photocatalytic function of a nanometer thin film, in particular to a method for improving the photocatalytic function of a nanometer thin film by utilizing the principle of light interference. Background technique [0002] There are records of using silver for disinfection in ancient my country. In the 1930s, German and Chinese researchers successively found that silver in water with 0.005-0.01% mg / L can play a bactericidal effect, making cells lose their activity, but the cells are killed. After that, it can release pyrogenic and toxic substances, such as endotoxin, which is a deadly substance that can cause typhoid, cholera and other diseases. One of the main manifestations of the photocatalytic function of nano-film is bactericidal effect, and nano-titanium dioxide has bactericidal effect under ultraviolet light irradiation. Titanium oxide is a wide bandgap semiconductor. When light with energy gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/08B01J37/02A61L9/22A61L2/08
Inventor 陆晓唯陆镝莱陆治国
Owner 陆晓唯
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