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Composite nanometer titanium dioxide photocatalysis material and preparation method thereof

A technology of nano-titanium dioxide and photocatalytic materials, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve problems such as low light utilization rate and affecting catalytic effect , to achieve the effects of improving hydrophilicity, improving photocatalytic efficiency, and improving visible light utilization

Active Publication Date: 2009-09-02
UNIVERSTAR SCI & TECH SHENZHEN
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AI Technical Summary

Problems solved by technology

The disadvantage is that ultraviolet light is required for excitation, the utilization rate of visible light is low, and weak indoor light will affect the catalytic effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] In addition, the present invention also provides a preparation method of composite nano titanium dioxide photocatalytic material, which comprises steps:

[0025] A. Take tetraethyl orthosilicate with a mass ratio of 17:5:4, deionized water, and silane coupling agent for mixed acidification reaction to obtain silica sol.

[0026] Among them, the modified organic silica sol is mainly obtained by hydrolyzing tetraethyl orthosilicate, and then adding a silane coupling agent under acid catalysis. At the same time, it is necessary to prepare a titanium dioxide sol with a concentration of 1%. The main preparation process is: First, the inorganic titanium salt is hydrolyzed to obtain a titanic acid solution; then the above-mentioned titanic acid solution is precipitated by microwaves to form titanium dioxide particles, and the precipitated water is washed; finally, additives and catalysts are added to the solution after the precipitated water washing, and the step-by-step temper...

Embodiment 1

[0035] Preferred embodiment one, first calculate the quality of titanium dioxide by inorganic titanium salt in molar ratio, then take by weighing 2 grams of inorganic titanium dioxide sol (1%), 8 grams of silica sol, 20 grams of propylene glycol methyl ether mix and make composite sol , and then the composite sol was sprayed to form a film on the glass substrate, and the coating was treated at 300° C. for 30 minutes to obtain a photocatalytic coating.

[0036] Then, the photocatalytic coating formed above was subjected to a degradation experiment: in a closed room (2×1.5×1.5m), formaldehyde was generated by a formaldehyde generator, the air flow was accelerated by a fan, and four 200W ultraviolet lamps were used to degrade the coating The photocatalytic coating with an area of ​​1m×1m was excited for 24 hours, after which the formaldehyde degradation rate was 45%.

Embodiment 2

[0037] Preferred embodiment two, first calculate the quality of titanium dioxide by inorganic titanium salt in molar ratio, take by weighing 2 grams of inorganic titanium dioxide sol (1%), 8 grams of silicon dioxide sol, 10 grams of propylene glycol methyl ether mix and make composite sol, Then soak the porous ceramic in the composite sol for 30 minutes, take it out and treat the ceramic at 300°C for 30 minutes to obtain a photocatalytic ceramic loaded titanium dioxide material.

[0038] Degradation experiments were carried out on the photocatalyst material formed above: in a closed room (2×1.5×1.5m), formaldehyde was generated by a formaldehyde generator, and the air flow was accelerated by a fan, and four 200W ultraviolet lamps were used at the same time, and then one square meter The amount of composite sol required for spraying on glass is exposed to light for 24 hours, and the formaldehyde degradation rate is 53%.

[0039] From the above data, it can be seen that the comp...

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Abstract

The invention discloses a composite nanometer titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: titanium dioxide collosol, silicon dioxide collosol and propylene glycol monomethyl ether, of which the mass ratio is 1 to 4 to 10, are uniformly mixed to form composite collosol; porous ceramics are soaked in the composite collosol for 30 minutes; and the porous ceramics are taken out to be heated for 30 minutes at the temperature of 300 DEG C so as to obtain photocatalysis ceramics loaded titanium dioxide materials. Compared with the prior art, the invention has the technical scheme that modified silicon dioxide collosol is mixed in the titanium dioxide collosol, and the existing Ti-O-Ti bond is replaced by a Ti-O-Si bond, thereby reducing the titanium oxidation-reduction potential, enabling titanium dioxide light absorption wavelength to generate redshift, and improving the visible light utility ratio of titanium as well as the adhesive power and the hardness of a coating.

Description

Technical field: [0001] The invention relates to a photocatalyst material, in particular to a composite nano-titanium dioxide photocatalyst material which can be used for indoor air pollution control, and simultaneously the invention also relates to a method for preparing the material. Background technique: [0002] In recent years, with the improvement of people's living standards, a large number of new decorative materials and luxurious and fashionable modern furniture and daily necessities have continuously entered the room, and the resulting indoor environmental pollution has become increasingly serious. The main indoor pollutants formaldehyde, benzene, toluene and other volatile organic compounds (VOC) seriously exceed the standard and the diseases caused by people are attracting great attention from all over the world. [0003] Regarding the control of indoor pollutants, there are many methods at home and abroad, such as: physical method, chemical method, biological me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/08B01J31/02A61L9/00A61L9/18
Inventor 王韶峰王欣王小仙
Owner UNIVERSTAR SCI & TECH SHENZHEN
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