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Preparing method for nitrogen mixed titania light catalyst

A technology of titanium dioxide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., and can solve the problems of high risk and pollution, high price, and large scale of magnetron sputtering method devices, etc. problems, to achieve great social and economic benefits, and to improve environmental quality

Inactive Publication Date: 2006-05-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetron sputtering method has a large scale and high price, and is not suitable for the preparation and doping modification of nano-powder materials
Utilize NH 3 Same as TiO 2 The reaction can also synthesize nitrogen-doped titania photocatalyst, but NH 3 dangerous and polluting
Therefore, the above method is inconvenient to realize large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh titanium dioxide powder (ST-01 photocatalytic titanium dioxide powder) and urea (H 2 NCONH 2 ) each of 1.5 g and 4.5 g, mixed with an agate mortar for 10 minutes, put into a ceramic crucible, calcined at 350° C. for 120 minutes, and slowly cooled to room temperature to obtain the desired substance. The obtained powder was pale yellow, indicating that TiO2 absorbs visible light due to the incorporation of nitrogen. Measured by the diffuse reflectance spectrum of the UV-visible spectrophotometer, its absorption edge extends from the original 390nm to 470nm.

Embodiment 2

[0017] Measure 100ml of titanium tetrachloride solution (analytically pure), and slowly drop it into 500ml of distilled water under the action of magnetic stirring. After continuing to stir for 1 hour, 50 ml of aqueous ammonia was slowly added to form a white flocculent titanium hydrate. Then the white floc obtained after separation with a centrifugal separator was dried at 80°C for 2 hours to obtain the precursor of titanium dioxide Ti(OH) 4 .

[0018] Weigh respectively 3.0 grams and 0.16 grams of the above-obtained product and urea (molar ratio 1.0:0.1), grind and mix them with an agate mortar for 10 minutes, put them into ceramic crucibles respectively, and calcinate them at 300°C for 180 minutes in an electric furnace , slowly cooled to room temperature. Measured by the diffuse reflectance spectrum of the ultraviolet-visible spectrophotometer, it produces certain light absorption in the range of visible light from 390nm to 500nm.

Embodiment 3

[0020] Measure 100ml of titanium tetrachloride solution (analytically pure), and slowly drop it into 500ml of distilled water under the action of magnetic stirring. After continuing to stir for 1 hour, 50 ml of aqueous ammonia was slowly added to form a white flocculent titanium hydrate. Then the white floc obtained after separation with a centrifugal separator was dried at 80°C for 2 hours to obtain the precursor of titanium dioxide Ti(OH) 4 .

[0021] Weigh 3.0 grams and 4.8 grams of the above obtained product and urea respectively (molar ratio 1.0:3.0), grind and mix them with an agate mortar for 10 minutes, put them into ceramic crucibles respectively, and calcinate them at 650°C for 60 minutes in an electric furnace , slowly cooled to room temperature. Measured by the diffuse reflectance spectrum of the UV-visible spectrophotometer, its absorption edge extends from about 600nm.

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Abstract

The invention discloses a preparation method of a nitrogen-doped titanium dioxide photocatalyst, which is used in the technical field of semiconductor photocatalysis. The invention adopts a solid phase reaction method to replace some oxygen elements in titanium dioxide with nitrogen, uses urea as a nitrogen source, and reacts with titanium dioxide powder or its precursor to generate nitrogen-doped titanium dioxide photocatalyst. The invention uses urea as nitrogen source, has simple process and safe operation. The bandgap width of the titanium dioxide photocatalyst is reduced by nitrogen doping, it has the ability to absorb visible light, the photocatalytic activity is improved, and it can effectively degrade pollutants and produce hydrogen by photolysis of water.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a nitrogen-doped titanium dioxide photocatalyst. It is used in the technical field of semiconductor photocatalysis. Background technique [0002] Photocatalysis is an emerging technology for environmental purification and energy conversion. Photocatalyst can effectively oxidize or reduce harmful gas molecules adsorbed on its surface, kill bacteria, inhibit viruses, and convert harmful organic matter and bacteria into harmless substances such as water and carbon dioxide without any secondary pollution; at the same time , the use of photocatalytic technology can be used to photolyze water to produce hydrogen, and directly convert solar energy into hydrogen energy. [0003] A typical representative of a practical photocatalyst is titanium dioxide. Titanium dioxide has the ability to absorb ultraviolet rays with a wavelength of 400nm or below, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06
Inventor 上官文峰袁坚陈铭夏施建伟刘震炎罗璇
Owner SHANGHAI JIAOTONG UNIV
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