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Preparation method of titanium dioxide film photocatalyst loaded on surface of flexible base material

A flexible substrate and titanium dioxide technology, which is applied in the direction of catalyst activation/preparation, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of narrow application range, and achieve low product cost, high photocatalytic activity, and low-cost raw materials Effect

Inactive Publication Date: 2003-02-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to study a method for preparing a nanocrystalline titanium dioxide thin film photocatalyst supported by a flexible substrate material, through a flexible material skeleton structure, to solve the problems of light utilization efficiency, increase the effective area of ​​light, fluid and catalyst, and narrow application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of the active layer sol: titanium tetrachloride is used as a precursor, and the ratio of the precursor solution is titanium tetrachloride:ethanol:water=1:10:0.12 (volume ratio). Addition sequence: first add water to the ethanol solution, then dropwise add titanium tetrachloride to form a light yellow transparent solution, and finally add 10% PEG400 (polyethylene glycol, molecular weight 400) to the solution, and keep it sealed for 3 days for formation. Gelling to obtain a yellow transparent sol with a certain viscosity.

[0023] (2) At room temperature, clean the non-woven fabric with a cleaning agent, immerse the material in the above-mentioned active layer sol, soak for 1 minute, and then centrifuge at high speed to remove the sol attached to the surface of the non-woven fabric, and dry it naturally. Then re-immerse in the sol solution of the active layer, centrifuge at high speed after 1 minute to remove the sol attached to the surface of the non-wove...

Embodiment 2

[0025] (1) Preparation of active layer sol: titanium tetrachloride is used as a precursor, and the ratio of the precursor solution is titanium tetrachloride:ethanol:water=1:12:0.15 (volume ratio). Addition sequence: first add water to the ethanol solution, then dropwise add titanium tetrachloride to form a light yellow transparent solution, and finally add 15% PEG400 to the solution, seal it and let it stand for 5 days to gel, and obtain a yellow color with a certain viscosity transparent sol.

[0026] (2) At room temperature, clean the non-woven fabric with a cleaning agent, immerse the non-woven fabric in the above-mentioned active layer sol, soak for 2 minutes, and then centrifuge at high speed to remove the sol attached to the surface of the non-woven fabric, and let it dry naturally. Then re-immerse in the active layer sol solution, centrifuge at high speed after 2 minutes to remove the sol attached to the surface of the non-woven fabric, and dry naturally to prepare two ...

Embodiment 3

[0028] (1) Preparation of active layer sol: using n-butyl titanate as a precursor, the volume ratio of each component in the precursor solution is: n-butyl titanate: ethanol: diethanolamine: water = 1: 10: 0.12: 0.06 , the order of adding the four substances is: first add water to the ethanol solution, then add diethanolamine as a stabilizer, and then add the n-butyl titanate solution dropwise to the above mixed solution, so that a light yellow uniform and transparent solution can be obtained , and finally, 20% PEG400 was added to the solution as a pore-forming agent, and the solution was left to stand for 7 days for gelation to obtain a transparent sol with a certain viscosity.

[0029](2) At room temperature, clean the non-woven material with a cleaning agent, immerse the non-woven material in the above-mentioned active layer sol, soak for 1 minute, and then centrifuge at high speed to remove the sol attached to the surface of the non-woven material, and dry naturally. Then ...

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Abstract

The preparation method of TiO2 film photocatalyst includes the following steps: firstly, using n-butyl titanate or titanium tetrachloride as precursor, adding pore-forming agent to prepare active layer sol, utilziing pulling-plating process to directly apply the active layer sol on the cleaned flexible base body, centrifugal removing excess sol, then placing the flexible base body with loaded gel into a water hot still, and using water-ethyl alcohol mixed solvent to form nano crystal TiO2 film photocatalyst at low temp.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of using a flexible material as a substrate and loading a titanium dioxide film on its surface as a photocatalyst. Background technique [0002] The existing preparation of titanium dioxide (TiO 2 ) There are three main types of methods for supporting photocatalysts: (1) using sol-gel to directly prepare TiO on the surface of the carrier 2 (2) the method of using nano-powder to disperse into a suspension and load it on the surface of the carrier also needs high-temperature calcination; (3) using inorganic and organic glue to load the nano-photocatalyst on the wire mesh. Wherein in method (1) owing to adopting the TiO prepared by sol-gel method 2 The photocatalyst thin film has a non-porous structure, small specific surface, poor activity, and the calcination temperature is generally above 400°C, which requires certain high temperature resistance fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01D53/86B01J21/06B01J21/08B01J23/10B01J35/00B01J37/00B01J37/02B01J37/03B01J37/10C09D1/00C09D5/00C09D185/00
CPCB01J23/10B01J37/036B01J37/10B01J37/0018B01J21/063B01J37/0215B01D2255/802B01J37/033B01J35/004B01J35/06B01D53/8668B01J35/58B01J35/39
Inventor 朱永法何俣喻方
Owner TSINGHUA UNIV
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