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Composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and preparation method thereof

A photocatalytic material, titanium dioxide technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the problem of low light utilization rate and achieve high catalytic activity , the effect of improving visible light utilization, high surface area and water resistance

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

Problems solved by technology

Its advantages are fast elimination speed, good effect, long duration, basically no secondary pollution, and the photocatalyst itself is not lost as a catalyst; the disadvantage is that it needs ultraviolet light to excite, the utilization rate of visible light is low, and weak indoor light will affect the catalytic effect

Method used

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preparation example Construction

[0028] In addition, the present invention also provides a preparation method of composite nano-phosphotungstic acid-titanium dioxide photocatalytic material, which specifically includes steps:

[0029] A, prepare the titania sol that concentration is 1% in advance;

[0030] The specific process includes:

[0031] a1, obtaining a titanic acid solution by hydrolyzing the inorganic titanium salt;

[0032] a2. Precipitating titanium dioxide particles from the above titanic acid solution by microwave, and washing the precipitate with water;

[0033] a3. Adding additives and catalysts to the solution after precipitation and washing, after step-by-step temperature treatment, after cooling, adding a precipitant to precipitate non-titanium inorganic impurities to obtain a pure water-based titanium oxide sol.

[0034] B. Mix titanium dioxide sol, phosphotungstic acid and propylene glycol methyl ether with a mass ratio of 20:3:50 to obtain a composite sol;

[0035] Firstly, phosphotun...

Embodiment 1

[0039] Preferred embodiment one, first calculate the quality of titanium dioxide by inorganic titanium salt according to molar ratio, then weigh 2 grams of inorganic titanium dioxide sol (1%), 0.3 gram of phosphotungstic acid, 5 gram of propylene glycol methyl ether to make composite sol, and then spray the composite sol to form a film on the glass substrate, and treat the above coating at 300° C. for 30 minutes to obtain a photocatalytic coating.

[0040] Degradation experiments were carried out on the photocatalytic coating formed above: 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 control the coating area. The photocatalytic coating of 1m×1m was excited for 24 hours, after which the formaldehyde degradation rate was 63%.

Embodiment 2

[0041] Preferred embodiment two, first calculate the quality of titanium dioxide by inorganic titanium salt in molar ratio, weigh 4 grams of inorganic titanium dioxide sol (1%), 0.6 gram of phosphotungstic acid, 10 grams of propylene glycol methyl ether are mixed to obtain a composite sol, and the mixed The sol was treated at 300°C for 30 minutes to obtain a xerogel with photocatalytic properties, and the xerogel was mechanically ball milled for two hours to obtain a nanoscale phosphotungstic acid-titanium dioxide composite photocatalyst material.

[0042] 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 ra...

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Abstract

The invention discloses a composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: firstly, titanium dioxide collosol, phosphotungstic acid and propylene glycol methyl ether, of which the mass ratio is 20 to 3 to 50, are uniformly mixed to form composite collosol; secondly, the composite collosol is heated for 30 minutes at the temperature of 300 DEG C to form dried gel; and finally, the dried gel is mechanically processed for two hours by ball milling so as to obtain phosphotungstic acid-titanium dioxide photorecombination photocatalyst materials. Compared with the prior art, the phosphotungstic acids of the invention are combined into a stable netty structure in the form of W-O-P molecular linkages, thereby reducing the oxidation-reduction potential, enabling a titanium dioxide composite membrane photoabsorption wavelength to generate redshift, and improving the utility ratio of titanium visible light; and further more, after the subsequent step of heating photocatalysis materials is accomplished, the keggin structure of the phosphotungstic acid is not affected, and high catalytic activity can still be maintained.

Description

Technical field: [0001] The invention relates to a photocatalyst material, in particular to a composite nano-phosphotungstic acid-titanium dioxide photocatalyst material which can be used for indoor air pollution control, and at the same time, 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 other daily necessities have continuously entered the room, and the resulting indoor environmental pollution has become increasingly serious. At present, the main indoor pollutants formaldehyde, benzene, toluene and other volatile organic compounds (voc) seriously exceed the standard, which brings great harm to people's health. [0003] Regarding the control of indoor pollutants, there are many methods at home and abroad, such as: physical method, chemical method, biological metho...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/188B01J31/02A61L9/00A61L9/18
Inventor 王韶锋王欣文秋红
Owner UNIVERSTAR SCI & TECH SHENZHEN
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