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Preparation method for nano-titanium dioxide film photocatalyst

A nano-titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of fast formation of titanium gel, complex synthesis methods, large types and quantities of organic reagents, etc. To achieve the effect of delaying hydrolysis and polycondensation reactions, easy control of reaction conditions, and reduction of types and dosages

Inactive Publication Date: 2009-02-18
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems with the use of strong acid catalysts. One is that the formation of titanium gel in the inorganic acid medium is fast and difficult to control. The particle size of the formed product titanium dioxide is relatively large, resulting in a decline in photocatalyst activity; Experimental equipment has greater pollution and corrosion
Therefore, conventional synthetic methods are more complicated, and the types and amounts of organic reagents used in the synthetic process are relatively large, causing environmental pollution and unnecessary waste.
In addition, the titanium dioxide immobilized film prepared by the conventional sol-gel method is prone to defects such as shedding cracks.

Method used

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  • Preparation method for nano-titanium dioxide film photocatalyst
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  • Preparation method for nano-titanium dioxide film photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 0.5g of n-butyl titanate dropwise to 5mL of 10% acetic acid solution by volume percentage, and stir continuously for 3h to obtain an acetic acid solution of n-butyl titanate; add 0.1g of non-ionic templating agent (Polyoxyethylene-polyoxypropylene-polyoxyethylene) was dissolved in 5mL of absolute ethanol, stirred until dissolved to obtain an ethanol solution of a non-ionic templating agent, and then added dropwise to the acetic acid solution of n-butyl titanate Stirring was continued for 1 hour to obtain a titanium sol, which was ultrasonically dispersed for 5 minutes, then transferred to an airtight container for aging for 24 hours to obtain a titanium gel.

[0020] (2) Clean the pre-cut ITO coated glass with a size of 12×5.7cm, dry it, immerse it in the titanium gel prepared above for 1min, and dip and pull it to form a film at a pulling speed of 1mm / s. Dry at 120°C for 10 minutes to obtain the precursor membrane.

[0021] (3) The precursor film was calcined ...

Embodiment 2

[0023] (1) Add 2.0g of n-butyl titanate dropwise to 10mL of 50% acetic acid solution by volume percentage, and stir continuously for 8h to obtain the acetic acid solution of n-butyl titanate; add 0.3g of nonionic template (Polyoxyethylene-polyoxypropylene-polyoxyethylene) was dissolved in 5mL of absolute ethanol, stirred until dissolved to obtain an ethanol solution of a non-ionic templating agent, and then added dropwise to the acetic acid solution of n-butyl titanate Stirring was continued for 3 hours to obtain a titanium sol, which was ultrasonically dispersed for 5 minutes, and then transferred to an airtight container for aging for 48 hours to obtain a titanium gel.

[0024] (2) Clean the pre-cut ITO coated glass with a size of 12×5.7cm, dry it, immerse it in the titanium gel prepared above for 5min, dip and pull it into a film at a pulling speed of 4mm / s, and Dry at 60°C for 360 minutes to obtain the precursor membrane.

[0025] (3) The precursor film was calcined at a ...

Embodiment 3

[0027] (1) Add 5.0g of n-butyl titanate dropwise to 100mL of 10% acetic acid solution by volume, and stir continuously for 6h to obtain the acetic acid solution of n-butyl titanate; add 0.3g of nonionic template (Polyethylene glycol) was dissolved in 5 mL of absolute ethanol, stirred until dissolved to obtain an ethanol solution of a non-ionic template agent, and then added dropwise to the acetic acid solution of n-butyl titanate and continued to stir for 12 hours to obtain a titanium sol , after ultrasonically dispersing the titanium sol for 10 min, transfer it to an airtight container and age it for 1 h to obtain a titanium gel.

[0028] (2) Clean the pre-cut ITO coated glass with a size of 12×5.7cm, dry it, immerse it in the titanium gel prepared above for 10 minutes, dip and pull it at a pulling speed of 4mm / s to form a film, and Dry at 120°C for 10 minutes to obtain the precursor membrane.

[0029] (3) The precursor film was calcined at a high temperature of 250° C. for ...

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Abstract

The invention relates to the technical field of photocatalyst, and discloses a method for preparing a nanometer titanium dioxide film photocatalyst through a sol gel method on the weak acid condition. The method comprises the following steps of: mixing and stirring the acetate solution of titanium acid dinbutyl phthalate and the alcohol solution of a non-ion type template agent to prepare titanium sol; and dipping and extracting a processed substrate, drying the substrate into a former body film, and calcining the former body film at a high temperature to obtain the nanometer titanium dioxide film photocatalyst. The method has a simple and easily controlled preparation process, the low cost of the preparation technology, little damage to equipment and environment, and no secondary pollution. The nanometer titanium dioxide film photocatalyst which is formed by compact and even nanometer level particles in ordered arrangement has the flat film and high photocatalysis efficiency. The nanometer titanium dioxide film photocatalyst can be repeatedly used with a certain practical application value.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to the preparation of nano titanium dioxide (TiO2) by sol-gel method under weak acid conditions. 2 ) Preparation method of thin film photocatalyst. Background technique [0002] Photocatalytic technology using semiconductor oxides as catalysts has been one of the hotspots in environmental research in the past 20 years. The use of semiconductor photocatalytic oxidation method to degrade water-phase organic pollutants and gas-phase organic pollutants has carried out fruitful research. It is a new technology of pollution control that has received increasing attention in recent years. Titanium dioxide has broad application prospects due to its stable chemical properties, strong photocorrosion resistance, low cost, non-toxicity and high photocatalytic activity. In view of the high cost, poor stability, difficult recycling and easy to cause secondary pollution of susp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C03C17/22
Inventor 安太成孙蕾李桂英
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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