Method for preparing nitrogen doped nano titanium dioxide photocatalyst with visible light activity by direct heat treatment method

A technology of nano-titanium dioxide and nitrogen doping, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of complex magnetron sputtering devices and high prices

Inactive Publication Date: 2006-02-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnetron sputtering device is relatively complicated and expensive, and it is not suitable for nano-TiO 2 Preparation of powder materials

Method used

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  • Method for preparing nitrogen doped nano titanium dioxide photocatalyst with visible light activity by direct heat treatment method
  • Method for preparing nitrogen doped nano titanium dioxide photocatalyst with visible light activity by direct heat treatment method
  • Method for preparing nitrogen doped nano titanium dioxide photocatalyst with visible light activity by direct heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First dissolve urea with distilled water to obtain a 0.5M aqueous solution, take 50ml of urea solution, add 15g of commercially available TiO 2 powder, followed by magnetic stirring at room temperature for 30 minutes. Dry in a water bath at 70°C to obtain a white precursor. Heat treatment at 350°C for 6 hours. A yellow powder was obtained after grinding.

Embodiment 2

[0021] First dissolve guanidine carbonate with distilled water to obtain a 0.1M aqueous solution, take 50ml of guanidine carbonate solution, add 15g of commercially available TiO 2 powder, then magnetically stirred at room temperature for 30 minutes. Dry in a water bath at 90°C to obtain a white precursor. Heat treatment at 350°C for 5 hours. A yellow powder was obtained after grinding.

Embodiment 3

[0023] First dissolve triethanolamine with distilled water to obtain a 6M aqueous solution, take 50ml of triethanolamine solution, add 15g of commercially available TiO 2 powder, then magnetically stirred at room temperature for 30 minutes. Dry in a water bath at 90°C to obtain a white precursor. Heat treatment at 650°C for 3.5 hours. A yellow powder was obtained after grinding.

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Abstract

The invention provides a method for preparation of photo-catalytic nitrogen doped nano titanium oxide having visible light activity, belonging to the art of preparing titanium oxide powder. With directive thermal treatment, mix nano TiO2 powder, TiO2 colloid or Ti (OH) 4 with nitrogen source and water proportionally to prepare mixture suspension, mix around for among 0.5- 1h in among 10- 30Deg. C, dry for among 30- 90Deg. C, thermally treat for among 300- 650Deg. C and keep 0.5- 6h, then the anatase- type nitrogen doped nano titanium oxide powder is prepared. The merit is characterized in that: the property simulation of the prepared anatase- type nitrogen doped nano titanium oxide powder contains: measuring the phase constituent and the grain size number by X- ray diffraction, measuring light absorption by ultraviolet- visible light defuse reflection. measuring the absorption spectrum of photodegradation methyl blue solution with ultraviolet- visible light spectrophotometer.

Description

technical field [0001] The invention belongs to the technical field of preparation of titanium dioxide powder, in particular to a preparation method of a nitrogen-doped nano titanium dioxide photocatalyst with visible light activity. Background technique [0002] Since Fujishima discovered n-type semiconductor TiO in 1972 2 Since the electrode can decompose water into oxygen and hydrogen when illuminated, photocatalysts represented by it have received extensive attention and research. TiO has been found 2 In the photocatalytic decomposition of organic matter, the reduction of N 2 It has great application prospects in the field of waste water treatment and so on. with TiO 2 The prepared photocatalyst has the functions of purifying air, sterilizing, deodorizing and so on. [0003] TiO 2 As a photocatalyst, under the irradiation of light with a wavelength of less than 387.5nm, the internal electrons are excited and interact with oxygen and water molecules in the air to ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/24B01J37/08
Inventor 曹文斌李艳红冉凡勇张小宁韦祎
Owner UNIV OF SCI & TECH BEIJING
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