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Preparation method of carbon nanotube-loaded titanium oxide photocatalyst

A technology of photocatalysts and carbon nanotubes, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. Problems such as difficulty in powder recovery, to achieve the effect of improving superiority, stable structure, and good cycle stability

Active Publication Date: 2021-08-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, TiO 2 The stable crystal form of anatase is the anatase type, and its band gap is about 3.2eV, so it can only absorb and utilize ultraviolet light with a wavelength of less than 380nm, and the utilization rate of sunlight, which is inexhaustible for human beings, is very low , because sunlight contains only about 5% of ultraviolet light; moreover, like other semiconductors, TiO 2 The conductivity of the nano-TiO is poor, and the photogenerated electrons and holes generated in the photocatalytic reaction are easy to recombine and deactivate; thirdly, nano-TiO 2 The powder is easy to agglomerate, which makes it difficult to expose the active sites, and the recovery of nano-powder is difficult, which easily leads to secondary pollution
These factors limit the TiO 2 Wide application of photocatalyst

Method used

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  • Preparation method of carbon nanotube-loaded titanium oxide photocatalyst
  • Preparation method of carbon nanotube-loaded titanium oxide photocatalyst
  • Preparation method of carbon nanotube-loaded titanium oxide photocatalyst

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preparation example Construction

[0048] The preparation method of the titanium oxide photocatalyst supported by carbon nanotubes proposed by the present invention comprises the following steps and content:

[0049] (1) First, dissolve 1-2.5g of analytically pure polyacrylonitrile powder with a molecular weight of 100,000-150,000 and 0.03-0.15g of ammonium fluoride in 15mL of N,N-dimethylformamide, and keep warm at 50-60°C Stir magnetically for 10-12 hours under the same conditions to obtain a transparent solution that is fully dissolved and uniformly dispersed;

[0050] (2) Then the solution obtained in step (1) is placed in a syringe, and the polyacrylonitrile fiber membrane containing ammonium fluoride is prepared by electrospinning, and it is set aside;

[0051] (3) Then mix 1.8-9.6g of analytically pure tetrabutyl titanate and 3-5mL of analytically pure glacial acetic acid in 40-80mL of absolute ethanol, and stir magnetically at room temperature for 20-40min to obtain a uniformly mixed solution; (2) 0.1-...

Embodiment

[0061]Example: 1.5 g of analytically pure polyacrylonitrile powder with a molecular weight of 150,000 and 0.1 g of ammonium fluoride were dissolved in 15 mL of N,N-dimethylformamide, and magnetically stirred at 60° C. for 12 hours to obtain a transparent solution. Then use a 10mL syringe to draw 10mL of the above-mentioned solution, install No. 22 flat metal needles, set the spinning parameters as: spinning voltage 18kV, spinning temperature 35°C, humidity 45%, the distance between the syringe needle and the receiving device for spinning is 15cm, the rotational speed of the receiving roller is 55rpm, and the flow rate of the solution is 0.0016mm / s; spin to obtain a white fiber membrane for use. Then, add 50mL of absolute ethanol, 4mL of glacial acetic acid and 6.6g of tetrabutyl titanate into a 100mL beaker, stir magnetically for 40min at room temperature and mix well; then transfer to a hydrothermal reaction kettle with a capacity of 100mL, and add The ammonium fluoride polya...

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Abstract

The invention relates to a preparation method of a carbon nanotube-loaded titanium oxide photocatalyst, belonging to the technical field of preparation and application of photocatalytic materials. The titanium oxide photocatalyst is in the shape of a nanotube in appearance, and is formed by nitrogen-and-fluorine co-doped anoxic titanium oxide loaded with a fluorine-doped carbon nanotube; and the titanium oxide material can be directly used for simulating photocatalytic degradation of pollutants under sunlight, and is a photocatalyst with excellent performance. The method comprises the following steps: firstly, with polyacrylonitrile as a raw material, adding ammonium fluoride, and preparing polyacrylonitrile nanofibers containing ammonium fluoride through an electrostatic spinning technology; then with tetrabutyl titanate as a titanium source, adding glacial acetic acid, and preparing a polyacrylonitrile fiber-loaded titanium oxide sample through a solvothermal method; and finally, performing high-temperature heat treatment in a vacuum tube furnace in an inert atmosphere to obtain the titanium oxide photocatalyst. The method has the advantages of easily available raw materials, high product yield, low cost and simple and safe production process, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a titanium oxide photocatalyst supported by carbon nanotubes, and belongs to the technical field of photocatalytic material preparation and application thereof. Background technique [0002] Since the British Industrial Revolution in the mid-18th century, the rapid development of industrialization has profoundly changed the production and lifestyle of human society; but at the same time, environmental pollution has accompanied industrialization, especially water pollution, which has a wide range of impacts and lasts for a long time , so the development of effective water pollution treatment technology is imminent. Compared with traditional wastewater treatment methods, photocatalytic wastewater treatment technology has the advantages of abundant energy (solar energy), mild conditions, high efficiency in degrading pollutants, no secondary pollution, low cost, and simple operation. extensive research has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/38B01J35/00
CPCB01J27/24C02F1/30C02F2101/38C02F2305/10B01J35/39B01J35/40Y02W10/37
Inventor 彭志坚陈燕符秀丽
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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