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Nitrogen-doped titanium dioxide solvent thermal preparation method

A titanium dioxide, solvothermal technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effect of particle reduction, reduction of catalytic activity, and particle uniformity

Inactive Publication Date: 2007-03-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, there are no reports at home and abroad that directly use titanium dioxide and nitrogen-containing organic compounds in the liquid phase to prepare nitrogen-doped TiO by solvothermal synthesis. 2

Method used

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preparation Embodiment 1

[0023]Add 1.0 g of titanium dioxide to the flask, add 20 g of triethanolamine, and then add 20 g of distilled water, that is, the weight ratio of titanium dioxide: nitrogen-containing organic matter (triethanolamine): solvent (water) is 1:20:20, and ultrasonically vibrate for 0.5 h. Pour the above mixture into a corrosion-resistant stainless steel hydrothermal reactor at room temperature, raise the temperature to 180°C, and reflux for 12 hours. The suspension was filtered, the solid was washed with distilled water and ethanol, and finally dried at 80° C. for 24 hours to obtain the nitrogen-doped titanium dioxide of the present invention. The nitrogen-doped titanium dioxide of the present invention has a nitrogen-doped mass of 8%, and the nitrogen-doped titanium dioxide of the present invention has high photocatalytic activity in evaluating the catalytic degradation of methyl orange under sunlight, and the degradation rate reaches 85% within 30 minutes.

preparation Embodiment 2

[0025] Add 1.0 g of titanium dioxide to the flask, add 10 g of triethanolamine, and then add 40 g of ethanol, that is, the weight ratio of titanium dioxide: nitrogen-containing organic matter (triethanolamine): solvent (ethanol) is 1:10:40, and ultrasonically vibrate for 1 h. Pour the above mixture into a corrosion-resistant stainless steel hydrothermal reactor at room temperature, raise the temperature to 140°C, and reflux for 36h. The suspension was filtered, the solid was washed with distilled water and ethanol, and finally dried at 120° C. for 12 hours to obtain the nitrogen-doped titanium dioxide of the present invention. The nitrogen-doped titanium dioxide of the present invention has a nitrogen-doped mass of 5%, and the nitrogen-doped titanium dioxide of the present invention has high photocatalytic activity in evaluating the catalytic degradation of methyl orange under sunlight, and the degradation rate reaches more than 90% within 30 minutes.

preparation Embodiment 3

[0027] Add 1.0 g of titanium dioxide to the flask, add 50 g of triethylamine, and then add 10 g of water, that is, the weight ratio of titanium dioxide: nitrogen-containing organic matter (triethylamine): solvent (water) is 1:50:10, and ultrasonically vibrate for 0.5 h. Pour the above mixture into a corrosion-resistant stainless steel hydrothermal reactor at room temperature, raise the temperature to 120°C, and reflux for 8 hours. The suspension is filtered, the solid is washed with distilled water and ethanol, and finally dried at 100° C. for 10 h to obtain the nitrogen-doped titanium dioxide of the present invention. The nitrogen-doped titanium dioxide of the present invention has a nitrogen-doped mass of 10%, and the nitrogen-doped titanium dioxide of the present invention has high photocatalytic activity in the catalytic degradation evaluation of methyl orange under sunlight, and the degradation rate reaches more than 90% within 30 minutes.

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Abstract

The invention provides a solvent-heat preparing method of N-doped TiO2, comprising: adding TiO2 into the solvent of N-containing organic alkali and water or alcohol, ultrasonic vibrating, pouring the mixture into a corrosion-resistant stainless steel hydrothermal reactor at room temperature, raising temperature to make solvent heat reaction, filtering, washing and drying and making it. And the invention overcomes the aggregation growth in the high temperature gas-phase reacting course, directly adopts TiO2 to one-step synthesize it by simple solvent heat synthesis process. And it has good dispersivity, small and uniform particles, high nitrogen doping quantity, high catalytic activity in the sun, etc.

Description

technical field [0001] The invention relates to a preparation method of nitrogen-doped titanium dioxide, which belongs to the field of new materials. Background technique [0002] As a wide bandgap semiconductor, titanium dioxide has wide application prospects due to its stable properties, non-toxicity, and high photocatalytic activity. But since TiO 2 (Anatase) has a forbidden band width of 3.2eV, and can only show catalytic activity under the excitation of ultraviolet light. However, the energy of ultraviolet light in sunlight accounts for only 4%, while the energy of visible light accounts for 43%. Therefore, in order to effectively utilize sunlight, it is very meaningful to study catalytic materials with high-efficiency photocatalytic activity under visible light. It is inevitable to seek cheap, environmentally friendly and high-performance visible light photocatalytic materials for the further development of photocatalysis. trend. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B01J21/06
Inventor 彭峰蔡领峰余皓黄垒王红娟
Owner SOUTH CHINA UNIV OF TECH
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