Process for preparing large particle surface loaded nano crystal titanium dioxide light catalyst

A surface-loaded, photocatalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low activity, poor bonding strength, etc., and achieve product cost reduction, small air resistance, The effect of simple process

Inactive Publication Date: 2003-04-09
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 photocatalyst loaded on the surface of large particles. Through the skeleton structure of large particles, the light utilization efficiency can be solved, the effective area of ​​light, fluid and catalyst can be improved, and the air resistance can be reduced. speed 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 the precursor, and the ratio of the precursor solution is: n-butyl titanate: ethanol: diethanolamine: water=1:8:0.1:0.05 (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. 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 oil stain on the surface of the glass ball with a cleaning agent, then roughen the surface of the glass ball with 4% HF solution, wash with deionized water, and dry. Immerse the glass ball in the sol of the transition layer, then pull it at a speed of 20cm / min, centrifuge to shake off the excess sol attac...

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 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 5 days for gelation to obtain a transparent sol with a certain viscosity.

[0023] (2) Preparation of active suspension: Add 1 g of nano-titanium dioxide powder into 50 ml of deionized water, then add about 3-4 drops of 2 mol / l nitric acid, and stir for 24 hours at 50° C. to obtain active suspension.

[0024] (3) At room temperature, clean the oil stain on the surface of the glass ball with a cleaning agent, then roughen the s...

Embodiment 3

[0027] (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.

[0028](2) The preparation of the active layer sol: with n-butyl titanate as the precursor, the proportion 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 a...

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PUM

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Abstract

The preparation process of the photocatalyst includes preparing transition layer sol with butyl titanates as precursor, preparing active layer sol with butyl titanate as precursor, coating the transition layer sol onto the large grain carrier via pulling to film, cold drying of the wet gel film, calcination to form TiO2 film, coating the active layer sol onto the large grain carrier with coated transition layer via pulling to film, drying and calcination to form TiO2 film photocatalyst. Or, nano TiO2 powder is compounded directly into suspension and coated via pulling process to large grain carrier to prepaer the photocatalyst. The photocatalyst of the present invention has the advantages of high binding strength, small gas resistance, easy to separate, high photocatalytic efficiency and high activity.

Description

Technical field: [0001] The invention relates to a method for preparing a nanocrystalline titanium dioxide photocatalyst loaded on the surface of large particles, 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 is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/02
Inventor 朱永法何俣
Owner TSINGHUA UNIV
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