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Process for preparing nm crystal TiO2 photocatalyst carried by metallic wire screen skeleton

A technology of wire mesh and skeleton materials, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low activity and poor bonding strength, and achieve high photocatalytic efficiency and gas resistance The effect of small size and simple process

Inactive Publication Date: 2002-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to study a preparation method of nanocrystalline titanium dioxide thin film photocatalyst loaded with wire mesh skeleton material, solve the light utilization efficiency, improve the effective area of ​​light, fluid and catalyst and reduce the air resistance and improve airspeed problem
The shortcomings of poor bonding strength and low activity can be overcome by transition layer and nanonization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of the transition layer sol: n-butyl titanate is used as a precursor, and the ratio of the precursor solution is n-butyl titanate: ethanol: diethanolamine: water = 1:8:0.1:0.05 (volume ratio) Dubbed into a solution. The order of adding the four substances is as follows: 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. It was airtight and allowed to stand for 3 days for gelation to obtain a transparent sol with a certain viscosity.

[0020] (2) At room temperature, clean the stainless steel wire mesh with a cleaning agent, and finally clean it with deionized water and dry it. Immerse the wire mesh in the sol of the transition layer, then pull it at a speed of 20cm / min, centrifugally shake off the excess sol attached to the surface of the mesh, and let it dry naturally. ...

Embodiment 2

[0022] (1) Preparation of the transition layer sol: n-butyl titanate is used as a precursor, and the ratio of the precursor solution is: n-butyl titanate: ethanol: diethanolamine: water = 1: 10: 0.12: 0.055 (volume ratio ) into a solution. 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. Stand still for 5 days for gelation to obtain a transparent sol with a certain viscosity.

[0023] (2) At room temperature, clean the ordinary aluminum alloy screen with a cleaning agent, and finally clean it with deionized water and dry it. Immerse the wire mesh in the sol solution of the transition layer, then pull it at a speed of 20cm / min, centrifugally shake off the excess sol attached to the surface of the mesh, and let it dry naturally. Then re-immerse in t...

Embodiment 3

[0025] (1) Preparation of the transition layer sol: n-butyl titanate is used as the precursor, and the proportioning ratio of the precursor solution is: n-butyl titanate: ethanol: diethanolamine: water = 1: 12: 0.15: 0.06 (volume ratio ) into a solution. The order of adding the four substances is as follows: 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. Sealed and left to stand for 7 days for gelation to obtain a transparent sol with a certain viscosity.

[0026] (2) Preparation of the active layer suspension: add 1 g of nano-titanium dioxide powder to 50 ml of deionized water, then add about 3-4 drops of 2 mol / 1 nitric acid, and stir for 24 hours at 50° C. to obtain an active suspension.

[0027] (3) At room temperature, clean the stainless steel wire mesh with a cleaning agent, and final...

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Abstract

A metallic wire screen skeleton material-carried nm-clas cystol TiO2 photocatalyst is prepared through preparing transistion layer sol from n-butyl titanate as precursor, preparing active layer sol from n-butyl titanium or TiCl4 and pore-forming agent, coating the transition layer sol on the cleaned metallic wire screen skeleton-shaped carrier, directly coating the active layer sol, drying and calcining; or preparing nm TiO2 powder suspension, and attaching it the said carrier to form the photocatalyst. Its advantages include high adhesion, low gas resistance and high photocatalytic efficiency and activity.

Description

Technical field: [0001] The invention relates to a method for preparing a nanocrystalline titanium dioxide photocatalyst supported by a wire mesh skeleton material, belonging to the field of chemistry and chemical engineering. Background technique: [0002] There are three main types of existing methods for preparing supported photocatalysts: (1) using sol-gel to directly prepare TiO on the surface of the carrier 2 The method of film; (2) the method of using nano powder to disperse into suspension and load it on the surface of the carrier; (3) the method of using inorganic and organic glue to load nano photocatalyst on the screen. Wherein in method (1) owing to adopting the TiO prepared by sol-gel method 2 Photocatalyst film, non-porous structure, small specific surface, poor activity. The photocatalyst prepared by the method (2) is difficult to put into practical use because the combination of the secondary particles and the base material is very loose, and the catalyst i...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J37/02
Inventor 朱永法何俣李巍
Owner TSINGHUA UNIV
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