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Preparation method and applications for precious metal doped PVDF nanofiber composite film

A technology of nanofibers and composite membranes, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of limiting residents' personal protection, difficult and efficient interception, low air filtration pressure resistance, etc., and achieve a significant sterilization effect , the effect of improving the removal efficiency

Inactive Publication Date: 2019-08-06
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for ultrafine particles (PM0.5) with a characteristic size of less than 0.5 microns in the air, it is still difficult for the air filter membrane with a single nanofiber structure to achieve high-efficiency interception and extremely low air filtration pressure resistance before and after filtration, which severely limits Residents' personal protection needs

Method used

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  • Preparation method and applications for precious metal doped PVDF nanofiber composite film
  • Preparation method and applications for precious metal doped PVDF nanofiber composite film
  • Preparation method and applications for precious metal doped PVDF nanofiber composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Ag + The preparation method of the PVDF nanofiber composite membrane of ion doping, comprises the following steps,

[0031] (1) Preparation of nanofiber composite membrane substrate: Deposit silver metal with a thickness of 150nm on the ultra-thin and high-transmittance non-woven fabric by magnetron sputtering; enhancing the conductivity of the substrate can improve the final filter membrane Uniformity of thickness. A filter membrane that is too thick will greatly enhance the value of the pressure difference, while a filter membrane that is too thin will seriously affect the improvement of filtration performance. Therefore, this step is a relatively critical step, and the non-uniform filtration membrane thickness will seriously restrict the improvement of the filtration performance of later products;

[0032] (2) Preparation of PVDF precursor solution: After uniformly mixing 7mL N,N-dimethylformamide and 3mL acetone, add 1.6g PVDF powder, after ultrasonic treatment fo...

Embodiment 2

[0035] The same as the above example 1, the difference is that in step (2) after "... constant temperature magnetic stirring for 12 hours to make the solution transparent and clear", then add 50 mg of silver nitrate powder, after ultrasonic treatment for 0.5 min, constant temperature magnetic stirring for 1 hour.

Embodiment 3

[0037] Same as above Example 2, the difference is that 100 mg of silver nitrate powder is added in step (2).

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Abstract

The invention discloses a preparation method and applications for a precious metal doped PVDF nanofiber composite film. The preparation method is characterized in that the method includes the following steps: (1) adopting a magnetron sputtering method to deposit silver metal whose thickness can reach 150 nm on ultra-thin high light transmission non-woven fabric so that a filtering film frame can be obtained; (2) mixing N,N-dimethyl formamide and acetone according to a ratio of 7 : 3, performing stirring and adding a certain amount of PVDF powder and silver nitrate powder, performing constant temperature magnetic stirring after ultrasonic treatment, and obtaining a precursor solution after 24 h of standing; and (3) connecting a high voltage direct current power live wire to the outer wall of a syringe needle, connecting a zero line to the filtering film frame to be as an electrospinning collection substrate, adding the precursor solution into a syringe, and obtaining a precious metal doped PVDF nanofiber composite film through an electrospinning manner. The preparation method has advantages of being ultrahigh in PM0.5 filtering efficiency, low in air filtering piezoresistance, highin quality factor and good in filtering stability.

Description

technical field [0001] The present invention relates to a preparation method of a PVDF nanofiber composite membrane, in particular to a preparation method of a precious metal-doped PVDF nanofiber composite membrane and its air suspension in PM0.5, PM1.0, PM2.5 and PM10, etc. applications in particle filtration. Background technique [0002] With the continuous improvement of the level of modern industrialization, the combustion process of coal and motor vehicle fuel in the city, as well as the diffusion process of dust and chemical solvents, have inevitably produced a large number of suspended fine particle pollutants in the air. PM2.5 refers to airborne particulate pollutants with a diameter less than or equal to 2.5 microns. As a major airborne particulate pollutant, PM2.5 suspended particulate pollutants seriously threaten the lives of the people, and are even the chief culprit for the deterioration of the climate and ecological environment. In recent years, severe smog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D69/02B01D67/00B01D46/54
CPCB01D46/0001B01D46/0028B01D46/543B01D46/546B01D67/0079B01D69/02B01D69/12B01D71/34B01D2323/39B01D2325/38B01D2325/48
Inventor 解凯贺张晓伟张涵赵静章晶荣车锦铭陈凯旗陈若望
Owner NINGBO UNIV
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