Aluminum doped titanium dioxide nano tube visible-light responsive photocatalyst and preparation method

A titanium dioxide and nanotube technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high processing cost, achieve the effect of reducing processing cost and improving visible light excitation function

Inactive Publication Date: 2009-05-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the processing cost is relatively high in the photocatalysis process, and the catalyst needs to be photocatalyzed under ultraviolet light, and to provide an aluminum-doped titanium dioxide nanotube visible light catalyst

Method used

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  • Aluminum doped titanium dioxide nano tube visible-light responsive photocatalyst and preparation method
  • Aluminum doped titanium dioxide nano tube visible-light responsive photocatalyst and preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing an aluminum-doped titanium dioxide nanotube visible light catalyst, comprising the steps of:

[0027] (1) Add 0.7g of titanium dioxide powder and 0.10g of aluminum oxide powder to 17mL of 10mol / L aqueous sodium hydroxide solution, stir for 0.8h; transfer to a reaction kettle lined with polytetrafluoroethylene, and heat to 110°C , react for 25h;

[0028] (2) cooling to normal temperature, washing the product with water until the pH is 7;

[0029] (3) Use 0.1mol / L hydrochloric acid aqueous solution to adjust the pH of the solution obtained in step (2) to be 2, soak for 0.5h, and then wash with water until the pH is 7;

[0030] (4) Filter the solution prepared in step (3), and dry the intercepted concentrated solution at 60° C. under normal pressure for 6 hours to obtain a solid;

[0031] (5) Calcining the solid described in step (4) at 500° C. for 6 hours to produce an aluminum-doped titania nanotube visible light catalyst.

[0032] In this examp...

Embodiment 2

[0035] An aluminum-doped titanium dioxide nanotube visible light catalyst is made by the following method:

[0036] (1) Add 1.0g of titanium dioxide powder and 0.30g of aluminum oxide powder to 15mL of 10mol / L potassium hydroxide aqueous solution, stir for 0.5h; heat to 120°C, and react for 20h;

[0037] (2) cooling to normal temperature, washing the product with water until the pH is 7.5;

[0038] (3) Use 0.5mol / L sulfuric acid aqueous solution to adjust the pH of the solution obtained in step (2) to be 3, soak for 1h, and then wash with water until the pH is 7.5;

[0039] (4) Filter the solution prepared in step (3), and dry the intercepted concentrated solution at 70° C. under normal pressure for 5 hours to obtain a solid;

[0040] (5) Calcining the solid described in step (4) at 400° C. for 6 hours to produce an aluminum-doped titania nanotube visible light catalyst.

Embodiment 3

[0042] An aluminum-doped titanium dioxide nanotube visible light catalyst is made by the following method:

[0043] (1) Add 0.5g of titanium dioxide powder and 0.20g of aluminum oxide powder to 20mL of 10mol / L potassium hydroxide aqueous solution, stir for 0.8h; heat to 100°C, and react for 30h;

[0044] (2) cooling to normal temperature, washing the product with water until the pH is 6.5;

[0045] (3) Use 0.3mol / L phosphoric acid aqueous solution to adjust the pH of the solution obtained in step (2) to 1, soak for 0.4h, and then wash with water until the pH is 6.5;

[0046] (4) Filter the solution prepared in step (3), and dry the intercepted concentrated solution at 50° C. under normal pressure for 7 hours to obtain a solid;

[0047] (5) Calcining the solid described in step (4) at 700° C. for 5 hours to produce an aluminum-doped titania nanotube visible light catalyst.

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Abstract

The invention discloses an aluminum-doped titanium dioxide nanotube visible light catalyst and a preparation method thereof. The aluminum-doped titanium dioxide nanotube visible light catalyst is prepared by the following method: (1) titanium dioxide powder and aluminum oxide powder are added into a sodium hydroxide water solution to be stirred, heated and react; (2) the mixture is cooled to normal temperature and is washed until the pH value is between 6.5 and 7.5; (3) an inorganic acid aqueous solution is used to adjust the pH value, the soaking is performed, and then the washing is performed until the pH value is between 6.5 and 7.5; (4) a trapped concentrated solution is dried to obtain a solid after the filtration; and (5) the calcination is performed for 5 to 7 hours at a temperature of between 300 and 700 DEG C to obtain the aluminum-doped titanium dioxide nanotube visible light catalyst. The catalyst can reduce the treatment cost for photocatalytic reactions, and fully utilize solar resources; the removal rate of the catalyst to humic acid TOC under visible light irradiation is high up to more than 70 percent and is only reduced by 10 percent or so compared with that of under ultraviolet lamp condition, thereby showing a good visible light excitation function.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method, in particular to a visible light catalyst and a preparation method. Background technique [0002] Because photocatalysis can generate hydroxyl radicals with strong oxidation ability, which can degrade pollutants non-selectively, so the development of new and efficient photocatalysts has become a hot spot. As a photocatalyst, titanium dioxide nanotubes, as products with a larger specific surface area in the titanium dioxide series, have become a research hotspot for photocatalysts and ozone catalysts. [0003] However, due to the limitations of catalysts, most of the light sources used to study photocatalytic reactions are ultraviolet light sources. In actual use, the processing cost is relatively high, which is harmful to the human body, and the practical value is limited. At present, the solution to this problem is generally to dope the catalyst with elements, so that the catalyst can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/04
Inventor 季民潘留明
Owner TIANJIN UNIV
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