Method for preparing nitrogen doped nanometer titanium dioxide visible light photocatalyst

A nano-titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high drying temperature, reduced catalytic activity, easy collapse of pores, etc., and increase the diameter of pores. , The effect of increasing the specific surface area and preventing collapse

Inactive Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH
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  • Description
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  • Application Information

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Problems solved by technology

However, the drying temperature of the preparation methods disclosed in the above-mentioned patents is relatively high, and there is a large amount of water or other alcohols in a liquid state between the pores of the titanium-containing precipitate. Due to the relatively large tension between th

Method used

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  • Method for preparing nitrogen doped nanometer titanium dioxide visible light photocatalyst
  • Method for preparing nitrogen doped nanometer titanium dioxide visible light photocatalyst
  • Method for preparing nitrogen doped nanometer titanium dioxide visible light photocatalyst

Examples

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Example Embodiment

[0021] Example 1

[0022] 1) Prepare a 0.01mol / L titanium sulfate solution, add the surfactant triethanolamine under stirring conditions, the mass of the surfactant accounts for 0.1% of the mass of the titanium sulfate solution, stir evenly, add 1mol / L ammonia to make the sulfuric acid Titanium is completely precipitated, continue to stir for 0.5h, stand for aging for 20h;

[0023] 2) Wash the precipitation in step 2) with deionized water until the total concentration of anions in the washed water is less than 0.1 mol / L, and then vacuum dry the precipitate in an environment with a pressure below 1000 Pa and a temperature below -10°C;

[0024] 3) After the precipitate is completely dried, it is heated to 450° C. and calcined for 1.5 hours to obtain a nitrogen-doped nano titanium dioxide photocatalyst. The color of the sample is light yellow, which is recorded as 1# sample.

[0025] The structure of 1# sample was detected by XRD, the sample is anatase nitrogen-doped nano titanium di...

Example Embodiment

[0026] Example 2

[0027] 1) Prepare a 1mol / L titanium sulfate solution, add surfactant Tween under stirring conditions, and add Tween with a mass of 0.2% of the mass of the titanium sulfate solution. After stirring, add 5mol / L ammonia to completely precipitate the titanium sulfate , Continue to stir for 2h, stand and age for 10h;

[0028] 2) Wash the precipitate with deionized water until the total concentration of all anions in the washed water is below 0.1 mol / L, and then dry the precipitate in an environment where the pressure is below 800 Pa and the temperature is below -5°C;

[0029] 3) After the precipitate is completely dried, it is heated to 800° C. and calcined for 0.5 h to obtain a nitrogen-doped titanium dioxide photocatalyst. The color of the sample is single yellow, which is recorded as 2# sample.

[0030] The structure of sample 2# was tested by XPS, and the result showed that N doping was incorporated into TiO 2 Within the lattice.

Example Embodiment

[0031] Example 3

[0032] 1) Prepare a 10mol / L titanium tetrachloride solution, add the surfactant polyethylene glycol under stirring conditions, the surfactant mass accounts for 0.3% of the total mass of the titanium tetrachloride solution, and add 2mol / L after stirring evenly The ammonium bicarbonate aqueous solution completely precipitates the titanium tetrachloride, continue to stir for 2h, and stand for 24h;

[0033] 2) Wash the precipitate with deionized water until the total concentration of all anions in the washed water is below 0.1 mol / L, and then dry the precipitate in an environment with a pressure below 200 Pa and a temperature below -30°C;

[0034] 3) After the precipitate is completely dried, it is heated to 500° C. and calcined for 1 hour to obtain a nitrogen-doped titanium dioxide photocatalyst. The color of the sample is bright yellow, which is recorded as 3# sample.

[0035] The 3# sample adopts ultraviolet visible diffuse reflectance to detect its spectral perf...

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Abstract

The invention provides a method for preparing a nitrogen doped nanometer titanium dioxide visible light photocatalyst and belongs to the field of titanium dioxide photocatalysis. The invention aims to solve the problem of low catalytic activity and the collapse of porous channels in the preparation process in the prior catalyst. The method comprises the followings steps that: 1), inorganic titanate reacts with a nitrogen containing compound in the presence of a surfactant to generate a sediment, the reaction solution is stirred for 0.5 to 10h and then stood and aged for 0 to 48h; 2), the sediment is subjected to vacuum freeze drying to form a precursor of the nanometer titanium dioxide visible light photocatalyst; and 3), the precursor is calcined at a temperature of between 250 and 800 DEG C for 0.5 to 10h to form the nitrogen doped nanometer titanium dioxide visible light photocatalyst. The method can avoid the collapse of the porous channels, and the prepared catalyst has the advantages of high number of surface active sites, big specific surface area, high catalytic activity, and the like.

Description

technical field [0001] The invention belongs to the field of titanium dioxide photocatalysis, and in particular relates to a preparation method of nitrogen-doped nano titanium dioxide visible light photocatalyst. Background technique [0002] Since 1972, Fujishima and Honda reported the use of TiO 2 Since the single crystal electrode photolysis of water (Fujishima A.Honda K.Electrochemical photolysis of waterata semiconductor electrode.[J].Nature, 1972,238:37-38.), people have studied the semiconductor photocatalyst TiO 2 A lot of research has been done on the application. TiO 2 It has shown good development prospects in wastewater treatment, air purification, photochemical cells, and hydrogen production by electrolysis of water. As early as 1977, Frank and Bard began experimenting with TiO 2 Degradation of cyanide in water (S.N.Frank, A.J.Bard, J.Am.Chem.Soc.99 (1977) 303.), since then the application of TiO2 in the environmental field has aroused great interest. After...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/06C02F1/30
Inventor 张敬畅张国良曹维良
Owner BEIJING UNIV OF CHEM TECH
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