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

A sol-gel method and titanium dioxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unavailable raw materials, unfavorable popularization and application, and high requirements for experimental equipment and reaction conditions. Achieve the effects of low cost, enhanced catalytic activity, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2007-09-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
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  • 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. 0.22 g of thiourea and ammonium fluoride (the molar ratio of Ti:F is 1:1.81) are dissolved in a mixed alcohol solution of methanol and ethanol (the volume ratio is 1:1). Under the condition of continuous stirring, the solution was added dropwise to the butyl titanate alcohol solution, and the pH value was adjusted with nitric acid. After continuous stirring for about 24 hours, it was placed in a 60 degree oven to slowly evaporate the solvent, and finally a whole piece of dry gel was obtained, crushed, and calcined at 500 degrees for 3-4 hours to obtain a light yellow powder. Use 1.0 g of the product to degrade methylene blue solution, at room temperature, magnetic stirring, dark reaction for 30 minutes, light reaction for 2 hours, and the degradation rate is 86.7%.

Embodiment 2

[0021] The other conditions were the same as in Example 1. The nitrogen source was replaced with 0.178 g urea, and the final product was 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, add excess triethylamine, then add dropwise ammonium fluoride alcohol solution at a molar ratio of Ti:F=1:1.36, and adjust the pH value with nitric acid. After stirring for about 24 hours, place it in an oven at 60 degrees to evaporate the solvent to obtain a whole piece of dry gel, crush it, and calcinate 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 material and 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 and fluorine co-doped anatase type titanium dioxide nano powder. Background technique [0002] After mankind enters the 21st century, the control and treatment of environmental pollution is a major issue that human society faces and needs to be solved urgently. Among the many environmental pollution control technologies, the heterogeneous photocatalytic process using inorganic semiconductor oxides as catalysts has become a kind of process due to its reaction at room temperature and the direct use of sunlight as a light source to drive oxidation-reduction reactions. Ideal environmental pollution control technology. Titanium dioxide photocatalyst is currently one of the most promising photocatalysts. It has the advantages of good chemical stability, abrasion resistance, light corrosion resistance, low cost and non-toxicity, so it is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(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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