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Rotating, soaking and pulling process of preparing photocatalyst film on circular tube as substrate

A photocatalyst, rotary impregnation technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of uneven coating of round tube substrates

Inactive Publication Date: 2004-06-23
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is in order to overcome the shortcoming that existing plating (coating) film method is not uniform to the coating film of round tube base material, provide a kind of rotating immersion pulling method that prepares photocatalyst thin film on round tube base material, thereby can in A uniform and smooth titanium dioxide film is formed on a cylindrical substrate

Method used

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  • Rotating, soaking and pulling process of preparing photocatalyst film on circular tube as substrate
  • Rotating, soaking and pulling process of preparing photocatalyst film on circular tube as substrate
  • Rotating, soaking and pulling process of preparing photocatalyst film on circular tube as substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Preparation of titanium dioxide solution: firstly mix n-tetrabutyl titanate, diethanolamine, water and absolute ethanol, and stir for 1 hour to obtain solution (1). Distilled water was mixed with the remaining ethanol to obtain solution (2). Then slowly add the solution (2) which has been transferred into the separatory funnel dropwise into the solution (1) under vigorous stirring, and continue stirring for half an hour to obtain a titanium dioxide solution. Among them, Ti(OC 4 h 9 ) 4 :EtOH:H 2 O:NH(C 2 h 5 Oh) 2 =1:26.5:1:1 (molar ratio), the concentration of titanium dioxide in this solution is 0.5 mol / liter.

[0023] The pretreatment process of ordinary glass round tubes (200mm×40mm (outer diameter)×2mm): Soak ordinary glass pieces (200mm×34mm×2mm) in concentrated nitric acid solution for two days, take them out, wash them, and then soak them in lotion After about two hours, wash it with distilled water, and then dry it in an oven to complete the pretreatme...

Embodiment 2

[0027] The concentration of titanium dioxide is 1.5 mol / L (Ti(OC 4 h 9 ) 4 :EtOH:H 2 O:NH(C 2 h 5 Oh) 2 =3:26.5:1:1 (molar ratio)), the pulling speed is 3mm s -1 , with a rotation speed of 200 rpm -1 , the rest of the method is the same as in Example 1, a titanium dioxide photocatalyst film is prepared on an ordinary glass tube, and the prepared titanium dioxide photocatalyst film is bright and uniform in film formation and has good photocatalytic performance.

Embodiment 3

[0029] The concentration of titanium dioxide is 0.3 mol / L (Ti(OC 4 h 9 ) 4 :EtOH:H 2 O:NH(C 2 h 5 Oh) 2 =0.6:26.5:1:1 (molar ratio)), the pulling speed is 3mm s -1 , with a rotation speed of 400 rpm -1 , after the wet film was dried in an oven at 100°C for 18min, the above operation was repeated 5 times, and then baked at 550°C for 1 hour. The obtained titanium dioxide photocatalyst thin film is bright and uniform in film formation and has good photocatalytic performance.

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Abstract

The rotating, soaking and pulling process of preparing photocatalyst film on circular tube as substrate includes the following steps: cleaning and drying the circular tube as substrate; preparing SiO2 bottom layer film according to the requirement of the photocatalyst film structure, if necessary; compounding photocatalyst solution of 0.2-2.5 mol / L concentration via sol-gel process; rotating, soaking and pulling the circular tube as substrate inside the photocatalyst solution at axial speed of 1-5 mm / s to the power -1, radial rotary speed of 100-400 rpm to form film; drying the wet film at 50-70 deg.c for 10-20 min and cooling; repeating the foregoing steps until reaching the required thickness; and finally roasting at 300-600 deg.c for 0.5-3 hr. The said process can produce bright and homogeneous TiO2 photocatalyst film.

Description

technical field [0001] The invention relates to a rotary dipping and pulling method for preparing a photocatalyst film on a circular tube substrate. Background technique [0002] Since the end of the 1990s, the United States, Japan and other countries have carried out research on the immobilization of titanium dioxide powder and / or the preparation of titanium dioxide thin films. So far, the feasibility of various membrane preparation techniques has been tested. The Chinese invention patent 00101041 applied by Japan Vacuum Technology Co., Ltd. provides a method for coating a photocatalytic film by vacuum magnetron sputtering. Chinese invention patent 98103510.8 uses a spin coating method to coat semiconductor thin films, but does not introduce specific methods and steps. The Chinese invention patent 96193834 applied by Japan Toto Machinery Co., Ltd. provides sol-gel method, sol method, coating method and magnetron sputtering method for preparing photocatalytic thin films. ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/889B01J35/02B01J37/02
Inventor 梁园园何明兴李新军王良焱张琦黄琮郑少健
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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