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Carbon nitride photocatalytic activity nano fiber membrane and preparation method thereof

A nanofiber membrane, catalytic activity technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems that have not been reported yet, achieve strong visible light absorption, large specific surface area, The effect of high practical value

Active Publication Date: 2015-07-15
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon nitride and carbon nitride composite photocatalytic materials have been widely reported (CN201410743566.3, CN201310726501.3, CN201410148267.5, CN201310240111.5), by changing the nano-morphology of The practical value of the catalyst, especially the electrospun nanofiber membrane properties to achieve morphological changes, the preparation of carbon nitride photocatalytically active nanofiber membranes has not been reported

Method used

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  • Carbon nitride photocatalytic activity nano fiber membrane and preparation method thereof
  • Carbon nitride photocatalytic activity nano fiber membrane and preparation method thereof

Examples

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Effect test

no. 1 example

[0026] Weigh 2g of polypyrazinamide, dissolve it in 10g of dichloromethane, stir at room temperature until it is completely dissolved, and keep it at 5°C for 12 hours to ripen polyazinamide so that its polymer chains are fully expanded in the solution to form a spinnable Spinning solution with good properties, add 5 drops of trifluoroacetic acid dropwise during spinning to improve the conductivity of spinning solution, place the high-voltage electrospinning device in a closed system, and remove the oxygen in the system with magnesium powder in advance to reach the mass concentration Less than 1% and heat the receiving screen to 550°C, add the above spinning solution to the spinning head, adjust the spinning head to 15cm away from the receiving screen, apply the electric field voltage to 50 kV, start spinning, and spin for 10 minutes , slowly reduce the surface temperature of the receiving screen at a rate of 5°C / min, anneal the carbon nitride fiber until the receiving screen dr...

no. 2 example

[0029] The second embodiment is a modified example of the first embodiment, using 2 g of 1,3,5-polytriazine aromatic amide, dissolving it in 24 g of dichloromethane, adding 5 drops of trifluoroacetic acid dropwise during spinning, and using aluminum powder Deoxidation, electrospinning electrode spacing 10cm, applied voltage 40kV, after spinning for 15 minutes, the temperature of the receiving screen was lowered at 2°C / min, and the rest of the conditions were the same as those of the first embodiment, and will not be repeated here. Treat pentachlorophenol (10mg / L) in water with this fiber membrane, and removal rate is 83.2% in 30 minutes (see attachment figure 2 ).

no. 3 example

[0031]The second embodiment is a modified example of the first embodiment. 1.5 g of polybenzoxazine is used, dissolved in 12 g of methylene chloride, and 4 drops of trifluorobutyric acid are added dropwise during the spinning process, deoxidized with zinc powder, and electrospun The distance between the wire plates is 12.5 cm, the applied voltage is 30 kV, and after 12 minutes of spinning, the temperature of the receiving screen is lowered at 3.5° C. / min, and other conditions are the same as those of the first embodiment. The fiber membrane was used to treat chloroform (5.0 mg / L) in water, and the removal rate was 99.7% in 2 hours.

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Abstract

The invention belongs to the technical field of photocatalytic water treatment, and particularly relates to a carbon nitride photocatalytic activity nano fiber membrane and a preparation method thereof. According to the carbon nitride photocatalytic activity nano fiber membrane, polypiperazine-amide acts as a spinning precursor, and a dichloromethane spinning solvent acts as a raw material, and a nano fiber membrane is prepared by electrostatic spinning in the high-voltage electrostatic field effect under oxygen insulation condition, and the nano fiber membrane is further subjected to in-situ high-temperature polycondensation. The nano fiber membrane has the advantages of small fiber diameter, high specific surface area, obvious quantum effect and the like, can obtain a relatively good degradation effect when being applied to pentachlorophenol visible light catalysis treatment, and still keeps the complete morphology and relatively high catalysis activity after being recycled for 10 times. The invention provides a novel utilizing mode of carbon nitride photocatalyst, which has a relatively good application prospect in the field of water pollution control.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic water pollution control, and in particular relates to a carbon nitride photocatalytically active nanofiber membrane and a preparation method thereof. Background technique [0002] Photocatalytic technology is a new type of efficient and clean water treatment technology. Due to its remarkable advantages such as low energy consumption, environmental friendliness, and complete mineralization of pollutants, it has received extensive attention and in-depth research in the field of water pollution control. In the 1970s, Carey et al first reported TiO 2 Under the irradiation of near ultraviolet light, polychlorinated biphenyls in water can be completely dechlorinated and detoxified, which has opened a new chapter in the field of photocatalysis for water treatment. Since then, a large number of in-depth studies have shown that the use of photocatalytic technology can not only treat a variety of re...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/06C02F1/30
Inventor 殷立峰牛军峰谢利利黄大弘代云容
Owner BEIJING NORMAL UNIVERSITY
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