A kind of piezoelectric antibacterial nano film air filter membrane and preparation method thereof

Abstract

The invention provides a piezoelectric antibacterial nano- film air filter film and a preparation method thereof. The preparation method comprises the following steps: dissolving PVDF in a solvent, and performing uniform mixing to obtain a PVDF solution; electrospinning the PVDF solution by using a filter cloth as a support material to obtain a PVDF composite fiber film, and drying the PVDF composite fiber film for later use; immersing and treating the electrospun PVDF fiber film in a polydopamine buffer solution to obtain a electrospun PVDF fiber film with a dopamine-coated surface; and immersing the electrospun PVDF fiber film with the dopamine-coated surface in a lysozyme buffer solution, and carrying out a grafting reaction to obtain an electrospun PVDF fiber film with a lysozyme-grafted surface. The piezoelectric filter material intercepts and adsorbs fine particles by the electrostatic effect, so the material has the advantages of realization of effective improvement of the filtering efficiency under the premise of non-obviously increasing the filtration resistance, long-lasting filtering effect, antibacterial property, effectiveness in prevention of clogging of film holes, and prolonged service life.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a piezoelectric antibacterial nano film air filter membrane and a preparation method thereof. Background technique [0002] In recent years, the harm of air pollution to human health has been increasing, and it is necessary to develop high-efficiency, low-resistance and durable air filter materials. At the same time, with the continuous improvement of people's environmental protection and health awareness, the inhibition and killing of microbial pathogens is particularly important. At present, the filter materials used for protection on the market are mainly melt blown electrostatic electret nonwoven materials and electrospun nanofiber nonwoven materials. Among them, electret refers to a solid dielectric material with long-term storage space and polarized charge ability. The dipole charges contained in the piezoelectric electret are usually in the absence o...

AI Technical Summary

Problems solved by technology

[0006] Compared with traditional filter materials, the filtration efficiency of melt-blown nonwoven materials is lower, only 60%-80%; it is easily affected by the use time and ambient temperature and humidity, resulting in unstable filtration effects, which affects the dust resistance of nanofibers. Commercial applications in protection

At the same time, there is a significant phenomenon of membrane fouling in the filtration process. Contaminated particles pass through the filter membrane and are trapped on the surface of the filter membrane through physical and chemical operations or mechanical action, resulting in membrane fouling, which affects filtration efficiency and maintenance costs.

[0007] In addition, due to the strong reproductive ability of microorganisms, even if the filter membrane can intercept 99.999% of bacteria, viruses and other microorganisms, the remaining microorganisms are enough to cause serious consequences

Moreover, microorganisms can reproduce, and the secreted microbial products form a biological pollution layer on the surface of the membrane to block the membrane pores, thereby reducing the flux of the filter membrane and increasing energy consumption, which in turn increases the operating cost of the filter membrane.

Images