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Preparation method of compound nanotube photocatalytic film of titanium dioxide and silicon dioxide

A technology of photocatalytic thin film and silicon dioxide, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficult to solve load problems, loss of catalytic effect, complex process, etc., and achieve excellent Effects of photocatalytic performance, strong process repeatability, and wide application prospects

Inactive Publication Date: 2010-01-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although nano-TiO 2 Photocatalysts are most commonly used for their non-toxic, harmless, strong oxidation ability, and good stability, but there are still some problems in their use: (1) Nano-TiO 2 The particles are so small that it is easy to cause waste with water loss in the process of wastewater treatment, and it is difficult to recycle.
(2) The light absorption efficiency is low, and the preparation of titanium oxide nanotubes with high specific surface area is one of the effective means to improve its light absorption characteristics
(3) Photogenerated hole-electron pairs are very easy to recombine and lose their catalytic effect. Therefore, from an economic point of view, how to improve the performance of nano-TiO 2 photocatalytic efficiency, avoiding recombination is an urgent problem to be solved
However, the process of composite titanium dioxide and silica mesoporous composites prepared by this method is relatively complicated, and generally requires two treatments, that is, to complete the preparation of mesoporous first and then perform composite treatment. Although the nanocomposite powder prepared by this method It can be completed at one time, but it is difficult to solve the load problem in the end, and it is difficult to recycle in the process of sewage treatment, which is easy to cause secondary pollution

Method used

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  • Preparation method of compound nanotube photocatalytic film of titanium dioxide and silicon dioxide
  • Preparation method of compound nanotube photocatalytic film of titanium dioxide and silicon dioxide
  • Preparation method of compound nanotube photocatalytic film of titanium dioxide and silicon dioxide

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Embodiment 1

[0018] Anodize the metal aluminum sheet with H at a concentration of 0.5M 3 PO 4 It is an electrolytic solution, the oxidation voltage is 100V, and the oxidation time is 10h. The aluminum substrate on which the anodized aluminum oxide template (AAO) has been grown after anodic oxidation is taken out and cleaned with deionized water before use. 0.5mol / L (NH 4 ) 2 TiF 6 and 0.5mol / L (NH 4 ) 2 SiF 6 The mixed solution was mixed according to the ratio of atomic content Si:Ti=5% to form a liquid phase deposition solution, which was fully stirred and placed in a water bath at 30°C for later use. Dip the AAO template into (NH 4 ) 2 TiF 6 and (NH 4 ) 2 SiF 6 After 15 minutes of deposition in the mixed solution, take it out, wash it with deionized water and dry it. Then heat up at 400°C for 3 hours and cool to room temperature with the furnace.

Embodiment 2

[0020] Anodize the metal aluminum sheet with H at a concentration of 0.5M 3 PO 4 It is an electrolytic solution, the oxidation voltage is 80V, and the oxidation time is 12h. The aluminum substrate on which the anodized aluminum oxide template (AAO) has been grown after anodic oxidation is taken out and cleaned with deionized water before use. 0.1mol / L (NH 4 ) 2 TiF 6 and 0.1mol / L (NH 4 ) 2 SiF 6 The mixed solution is mixed according to the ratio of atomic content Si:Ti=10% to form a liquid phase deposition solution, which is fully stirred and placed in a 35°C water bath for later use. Dip the AAO template into (NH 4 ) 2 TiF 6 and (NH 4 ) 2 SiF 6 After stirring and depositing in the mixed solution for 20 minutes, take it out, wash it with deionized water and dry it. Then heat up at 500°C for 2 hours and cool to room temperature with the furnace.

Embodiment 3

[0022] Anodize the metal aluminum sheet with H at a concentration of 1M 3 PO 4 It is an electrolytic solution, the oxidation voltage is 100V, and the oxidation time is 10h. The aluminum substrate on which the anodized aluminum oxide template (AAO) has been grown after anodic oxidation is taken out and cleaned with deionized water before use. 0.05mol / L (NH 4 ) 2 TiF 6 and 0.05mol / L (NH 4 ) 2 SiF 6 The mixed solution is mixed according to the ratio of atomic content Si:Ti=20% to form a liquid phase deposition solution, which is fully stirred and placed in a water bath at 40°C for later use. Dip the AAO template into (NH 4 ) 2 TiF 6 and (NH 4 ) 2 SiF 6 After stirring and depositing in the mixed solution for 30 minutes, take it out, wash it with deionized water and dry it. Then heat up at 500°C for 3 hours and cool to room temperature with the furnace.

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Abstract

The invention relates to a preparation method of a compound nanotube photocatalytic film of titanium dioxide and silicon dioxide, which belongs to the field of nanofilms. At present, the problem of easy compound of photo-excited holes and electron pairs of a titanium dioxide photocatalytic film causes that the titanium dioxide photocatalytic film has lower efficiency when being applied to sewage treatment. The preparation method comprises the following steps: adopting anodic aluminum oxide (AAO) as a template and dipping the AAO into a mixed solution of (NH4)2TiF6 and (NH4)2SiF6 at 30-40 DEG C for co-deposition in-situ growth by utilizing a liquid-phase deposition method so as to prepare the compound nanotube photocatalytic film of titanium dioxide and silicon dioxide with a good appearance; after cleaning and drying the prepared film, preparing the compound nanotube photocatalytic film of titanium dioxide and silicon dioxide with high photocatalytic performance by carrying out heat treatment and preserving heat for 2-4 hours at 400-600 DEG C. The preparation method completes the nanofilm and compound treatment at one time, and the film has strong repeatability, is convenient for mass production and can get a treatment efficiency of 70-95 percent after being applied to a photocatalytic reaction of a methyl blue solution of 100mg / L (0.1wt%).

Description

Technical field: [0001] The invention discloses a method for preparing a titanium dioxide silicon dioxide composite nanotube photocatalytic film, more specifically, using an anodized aluminum oxide AAO template to co-deposit a titanium dioxide silicon dioxide composite nanotube photocatalytic film, which belongs to the field of nanometer films. Background technique: [0002] Energy and environmental pollution are the primary issues facing mankind in the 21st century. The combination of nanotechnology and semiconductor photocatalysis technology, applied to environmental protection and governance, has brought new opportunities to environmental pollution and governance. Nano-TiO 2 With its excellent photocatalytic performance, it has attracted extensive attention from the material science community at home and abroad, and has become one of the hot spots of development and research. [0003] Although nano-TiO 2 Photocatalysts are most commonly used for their non-toxic, harmle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/03B01J35/00B01J21/08B01J21/06
Inventor 王金淑李洪义王珍珍陈欣崔云涛
Owner BEIJING UNIV OF TECH
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