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Method of preparing nitrogen fluorine codope titanium dioxide photocatalyst by using sol-gel method

A sol-gel method, titanium dioxide technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems that raw materials are not readily available, unfavorable for popularization and application, and high requirements for experimental equipment and reaction conditions. Achieve the effect of low cost, enhanced catalytic activity, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2010-07-28
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this doping method has high requirements on experimental equipment and reaction conditions, and the raw materials are not easy to obtain, which is not conducive to popularization and application in production practice.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 2.0 ml of butyl titanate in 10 ml of absolute ethanol, and stir well. Dissolve 0.22g of thiourea and ammonium fluoride (the molar ratio of Ti:F is 1:1.81) in the mixed alcohol solution of methanol and ethanol (the volume ratio is 1:1). The solution was added dropwise into the butyl titanate alcohol solution under continuous stirring, and the pH value was adjusted with nitric acid. After continuous stirring for about 24 hours, put it into a 60-degree oven to slowly evaporate the solvent, and finally obtain a whole dry gel, crush it, and calcinate it at 500 degrees for 3-4 hours to obtain a light yellow powder. Use 1.0 g of this product to degrade the methylene blue solution, at room temperature, with magnetic stirring, dark reaction for 30 minutes, light reaction for 2 hours, and the degradation rate is 86.7%.

Embodiment 2

[0021] Other conditions are the same as in Example 1, the nitrogen source is changed into 0.178g urea, and the final product is a yellow powder. The photocatalytic degradation experiment was carried out under the same conditions as in Example 1, and the degradation rate was 15.3%.

Embodiment 3

[0023] Dissolve 2.0 ml of butyl titanate in 15 ml of ethanol and stir well. Under the condition of continuous stirring, excess triethylamine was added, and ammonium fluoride alcohol solution was added dropwise according to the molar ratio Ti:F=1:1.36, and the pH value was adjusted with nitric acid. After stirring for about 24 hours, put it in a 60-degree oven to evaporate the solvent to obtain a whole dry gel, crush it, and calcinate it at 500 degrees for 3-4 hours to obtain a light yellow powder. The photocatalytic degradation experiment was carried out under the same conditions as in Example 1, and the degradation rate was 75%.

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Abstract

The present invention provides process of preparing anatase type nanometer N and F co-doped titania powder with visible light catalysis activity. The preparation process includes the following steps: the alcoholysis reaction and condensation reaction of titanate, nitrogen source and fluorine source in alcohol solution at room temperature, regulating the pH value of the reaction system with water solution of nitric acid, volatilizing solvent slowly to obtain massive gel, and final heat treatment to obtain nanometer N and F co-doped titania powder. The obtained product of the preparation process has anatase type structure and visible light catalysis activity of degrading methylene blue and other organic dye pollutant effectively. The preparation process has simple operation, facile materialand mild reaction condition, and may be used in industrial production.

Description

technical field [0001] The invention relates to a method for preparing new catalyst materials, in particular to a method for preparing nitrogen-fluorine co-doped anatase titanium dioxide nanopowder. Background technique [0002] After mankind entered the 21st century, the control and treatment of environmental pollution is a major issue that human society is facing and needs to be solved urgently. Among many environmental pollution control technologies, the heterogeneous photocatalytic process using inorganic semiconductor oxides as catalysts has become a kind of photocatalytic process due to its reaction at room temperature and the ability to directly use sunlight as a light source to drive oxidation-reduction reactions. Ideal environmental pollution control technology. Titanium dioxide photocatalyst is one of the photocatalysts with the most application potential at present. It has the advantages of good chemical stability, wear resistance, light corrosion resistance, low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/12B01J21/06
Inventor 丁旵明孟艳玲王莹陈剑松
Owner EAST CHINA NORMAL UNIV
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