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Preparation method of bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane

A technology of titanium oxide nanotubes and composite photocatalysis, applied in the field of photocatalysis, can solve the problems of low activity, easy agglomeration, difficult recycling, etc., achieve good photocatalytic performance, reduce interfacial tension, and facilitate wetting

Inactive Publication Date: 2013-09-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing a bismuth oxyhalide-titanium oxide nanotube array composite photocatalytic film, by loading bismuth oxyhalide on the titanium oxide nanotube array to solve the problem of existing photocatalysts. Low activity, easy to agglomerate, difficult to recycle and other shortcomings

Method used

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  • Preparation method of bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of TiO nanotube array film

[0028] Mix ethylene glycol and deionized water at a mass ratio of 4:1, and use the mixed solvent to prepare a 0.25% ammonium fluoride solution. Add the ammonium fluoride solution into the reaction vessel, use the titanium sheet (99.9%) as the anode, and the platinum sheet (99.99%) as the cathode, and anodize at 40°C and 40V for 3 hours, and magnetic stirring is always carried out during the oxidation process. After the reaction, the oxidized titanium sheet, that is, the sample sheet, was washed with deionized water, dried, and annealed at 460° C. for 2 hours to obtain a titanium oxide nanotube array film.

[0029] (2) BiOBr-TiO 2 Preparation of Nanotube Array Composite Photocatalytic Thin Film

[0030] Use 40% acetic acid aqueous solution to prepare 0.5M bismuth nitrate solution, use 0.25M ammonium acetate aqueous solution to prepare 0.25M NH 4 Br solution. Put the annealed sample into a 100ml flask, add 25ml of 0.5M bism...

Embodiment 2

[0034] A titanium dioxide nanotube array film was prepared according to the steps of Example 1 (1).

[0035] Use 50% acetic acid aqueous solution to prepare 0.5M bismuth nitrate solution, and use 0.25M ammonium acetate aqueous solution to prepare 0.3M NH 4 Br solution. Put the annealed sample into a 100ml flask, add 25ml of 0.5M bismuth nitrate solution into the flask, fully immerse the sample under the liquid surface, and vacuum-impregnate it for 60min under reduced pressure to below 10kPa. Then the sample piece was taken out from the bismuth nitrate solution, immersed in 50ml, 0.3M NH 4 Br solution, standing at room temperature for 5h. Finally, send the samples from NH 4 Br solution was taken out, fully washed with deionized water, and dried at 110 °C for 1 h to obtain BiOBr-TiO 2 Nanotube array composite photocatalytic film.

Embodiment 3

[0037] A titanium dioxide nanotube array film was prepared according to the steps of Example 1 (1).

[0038] Use 45% acetic acid aqueous solution to prepare 0.2M bismuth nitrate solution, and use 0.25M ammonium acetate aqueous solution to prepare 0.3M NH 4 Br solution. Put the annealed sample into a 100ml flask, add 25ml of 0.2M bismuth nitrate solution into the flask, fully immerse the sample under the liquid surface, and vacuum-impregnate it for 60min under reduced pressure to below 10kPa. Then the sample piece was taken out from the bismuth nitrate solution, immersed in 50ml, 0.3M NH 4 Br solution, standing at room temperature for 5h. Finally, send the samples from NH 4Br solution was taken out, fully washed with deionized water, and dried at 110 °C for 1 h to obtain BiOBr-TiO 2 Nanotube array composite photocatalytic film.

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Abstract

The invention belongs to the field of photo-catalysis, and in particular relates to a preparation method of a bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane. The method comprises the steps of: first, preparing a titanium dioxide nanotube array membrane by adopting an anode oxidization method; then, enabling bismuth ions to enter nanotubes by vacuum impregnation; and at last, with a solution containing halide ions as a precipitator, enabling the halide ions to react with the bismuth ions to generate bismuth oxide halide, wherein the bismuth oxide halide is deposited in the nanotubes and on the surface of the nanotube of the titanium dioxide nanotube array so as to obtain the bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane. The preparation method disclosed by the invention combines the advantages of the titanium dioxide nanotube array and the advantages of the bismuth oxide halide, is convenient to use, and can be used for preparing composite photo-catalytic membranes with different bismuth oxide halide load capacities by changing the concentration of bismuth ions, etc; and the prepared composite photo-catalytic membrane has good photo-catalysis performance, large adjustability and high controllability,.

Description

Technical field: [0001] The invention belongs to the field of photocatalysis, in particular to a method for preparing a photocatalysis thin film. Background technique: [0002] Photocatalyst is a substance that does not change itself under the irradiation of light, but can promote chemical reactions. It is widely used in the degradation of pollutants, air purification, self-cleaning, antibacterial, deodorization, etc. [0003] There are many types of photocatalysts, and the forms of photocatalysts mainly include powder and film. The advantage of powder is its large specific surface area, but its disadvantages are easy agglomeration and difficulty in recycling. The film is simple and convenient to use, which can overcome the disadvantages of powder. [0004] Titanium oxide is a photocatalyst with stable properties, no toxic and side effects, and cheap and easy-to-obtain raw materials. The morphology of the photocatalyst has a great influence on its performance. Although the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C25D11/26B82Y40/00
Inventor 赵建玲王西新杨静徐幸如杨盛英
Owner HEBEI UNIV OF TECH
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