CN114920971B - Dynamic electret filter element of PVDF composite graphene - Google Patents
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Abstract
The invention belongs to the field of air filtration, and particularly relates to a dynamic electret filter element of PVDF composite graphene. The high-voltage electrostatic field electrode required by dynamic electret is manufactured by the MOFs electrode film prepared by compounding, and the high-voltage electrostatic field electrode is combined with the electret mechanism of the graphene-polyvinylidene fluoride (GR-PVDF) composite electret substrate, so that a novel dynamic electret air purification mechanism is constructed, and meanwhile, the catalytic mechanism of the MOFs is fused with the high-voltage electrostatic field, so that the comprehensive performances of good sterilization, degradation of gaseous pollutants and the like are achieved.
Description
Technical Field
The invention belongs to the field of air filtration, and particularly relates to a dynamic electret filter element of PVDF composite graphene.
Background
With the progress of the age, people have increasingly high requirements on environmental quality. But the rapid development of economy aggravates environmental pollution, and dust, chemical substances, harmful microorganisms and the like in the air have adverse effects on the health of people. Therefore, effective control of harmful substances in the air is a significant problem to be solved. The use of air filters and filter materials is an important means of purifying air. The common air filter material is not thorough for removing fine particles, and harmful microorganisms are easy to grow on the filter material, so that secondary pollution is possible. Since the epidemic situation of the new coronavirus, the national regulatory authorities have strengthened epidemic prevention and disinfection in public places and indoor environments, and respiratory infectious diseases are easy to carry out interpersonal infection through spray and air flowing aerosol, so that the air disinfection in the indoor environments becomes very important.
Electret air filter materials offer the potential to address this difficulty. The electret filter material directly attracts and captures polar particles or polarized particles in the atmosphere by means of electrostatic force on the surface of the electret filter material, and has the effects of inhibiting and killing bacteria. In China, the university of east China Liu Lifang and Ding Bin teach groups to research and develop polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membranes with excellent antibacterial performance by using an electrostatic spinning technology, and the antibacterial rate of the polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membranes on staphylococcus aureus can reach more than 99%, so that the polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membranes have a good antibacterial effect. Polypropylene and polystyrene electret fiber membranes were also synthesized by the professor Jooyoun Kim group of the national university of korea, and the results show that the fluorinated polypropylene fiber membranes have excellent particulate matter filtration performance and antibacterial properties against staphylococcus aureus. However, at present, researchers mostly fuse electret materials such as PVDF into an air purification filter material through an electrostatic spinning technology, so that the defects of high wind resistance pressure, low flame retardant property and the like of a system are caused, and a frequently selected product is a high-voltage electrostatic purification and disinfection device, but the product is large in size and difficult to install, and ozone pollution is easy to generate.
Disclosure of Invention
In order to solve some existing problems, the invention provides a electret substrate and a dynamic electret filter element prepared by adopting the same. The air purifying equipment using the dynamic electret filter element provided by the invention can meet the requirements of disease transmission prevention and control in public places, can eliminate other air pollution in indoor environments, and can be widely applied to indoor (in-car) environments in public places or private places such as rail transit, hospitals, stations, office buildings, families and the like.
In particular, the method comprises the steps of,
on one hand, the invention provides a electret substrate which is formed by depositing graphene on a polymer substrate with good electric polarity.
In some embodiments, the polymer with good electrical properties is PVDF or PANI; PVDF is polyvinylidene fluoride, and PANI is polyacrylonitrile.
In some embodiments, the graphene is graphene oxide.
In some embodiments, the depositing is by instillation.
In some embodiments, the deposition is a uniform coating of graphene aqueous solution onto a polymer substrate with good electrical polarity with the aid of centrifugal force.
In some embodiments, the mass ratio of graphene to polymer with good electrical polarity is 1-4%.
In some embodiments, the mass ratio of graphene to polymer with good electrical polarity is 3%.
In some embodiments, the polymer substrate with good electrical properties is a porous electret substrate.
In some embodiments, the polymer substrate with good electrical properties is a porous W-type electret substrate.
In some embodiments, the polymer substrate with good electrical properties is a porous U-shaped electret substrate.
In some embodiments, the polymer substrate with good electrical properties is a porous honeycomb electret substrate.
In some embodiments, the polymer substrate with good electrical properties is a porous W-type electret substrate, a porous U-type electret substrate or a porous honeycomb-type electret substrate.
On the other hand, the invention also provides a composite material dynamic electret filter element, and the electret substrate is adopted as electret.
In some embodiments, MOFs electrode films are employed as embedded electrodes for the electret substrate.
In some embodiments, the MOFs electrode film is prepared using the following method:
1) Preparing layered MOFs (optionally Co-MOFs, zn-MOFs or Al-MOFs) comprising the steps of: taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; the solution is reacted under the sealing at 70-90 ℃; reflux reacting the obtained product with 2,3,4,5, 6-pentafluorobenzamine and methanol;
2) The steps of the composite MOFs material and polymer include: coating the layered MOFs prepared in the step 1) on carbon cloth, and controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electropolymerization method.
In some embodiments, the MOFs electrode film is prepared using the following method:
1) Preparation of layered MOFs (optionally Co-MOFs, zn-MOFs or Al-MOFs): taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; the solution is reacted for 24 hours at 85 ℃ under sealing; cooling, filtering, washing with methanol, and drying; reacting the dried product with 2,3,4,5, 6-pentafluorobenzamine and methanol at 70 ℃ for 24 hours; filtering, adding methanol, soaking for 1 day, washing with methanol, and drying;
2) Compounding MOFs materials with polymers: coating the layered MOFs prepared in the step 1) on carbon cloth, controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electro-polymerization method, and rapidly and controllably polymerizing to realize electric conduction among Co-MOFs nano-crystalline particles to prepare the conductive porous electrode with joint flexibility and toughness.
On the other hand, the invention also provides an air purification and disinfection device which is characterized in that the composite material dynamic electret filter element is adopted.
Based on the research of the air purification and disinfection technology combining high-voltage static electricity and photocatalytic materials, the invention provides a research scheme combining a specific composite material and a high-voltage static electricity mechanism, and a dynamic electret mechanism constructed by the composite material is used for realizing a good air purification and disinfection effect.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, which are intended to cover all alternatives, modifications and equivalents, which are included within the scope of the invention as defined by the appended claims. Those skilled in the art will recognize that many methods and materials similar or equivalent to those described herein can be used in the practice of the present invention. The present invention is in no way limited to the methods and materials described herein. In the event of one or more of the incorporated references, patents and similar materials differing from or contradictory to the present application (including but not limited to defined terms, term application, described techniques, etc.), the present application controls.
All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All patents and publications referred to herein are incorporated by reference in their entirety.
On the one hand, the invention provides a electret substrate which is characterized in that graphene is deposited on a polymer substrate with good electric polarity.
The term "polymer with good electrode properties" refers to organic polymers with good motor properties, non-limiting examples include polyvinylidene fluoride, polyacrylonitrile.
In some embodiments, the polymer with good electrical properties is PVDF or PANI; PVDF is polyvinylidene fluoride, and PANI is polyacrylonitrile.
In some embodiments, the polymer with good electrical properties is PVDF.
In one aspect, the invention provides a electret substrate obtained by depositing graphene on a polyvinylidene fluoride substrate.
In some embodiments, the graphene is graphene oxide.
In some embodiments, the depositing is by instillation.
In some embodiments, the deposition is a uniform coating of graphene aqueous solution onto a polymer substrate with good electrical polarity with the aid of centrifugal force.
In some embodiments, the deposition is a uniform coating of graphene in aqueous solution onto a polyvinylidene fluoride substrate with the aid of centrifugal force.
In some embodiments, the mass ratio of graphene to polymer with good electrical polarity is 1-4%.
In some embodiments, the mass ratio of graphene to polymer with good electrical polarity is 3%.
In some embodiments, the polymer substrate with good electrical properties is a porous electret substrate.
In some embodiments, the polymer substrate with good electrical properties is a porous W-type electret substrate.
The term "porous W-type electret substrate" refers to a substrate in which the pores are W-type. In some embodiments, the W-type electret substrate is a substrate with W-type holes having a side length of "4-6mm" and a spacing of "4-6 mm".
In some embodiments, the polymer substrate with good electrical properties is a porous U-shaped electret substrate.
The term "porous U-shaped electret substrate" refers to a substrate in which the pores are U-shaped. In some embodiments, the U-shaped electret substrate is a substrate with U-shaped holes with sides of "4-6mm" and a spacing of "0.4-0.6 mm".
In some embodiments, the polymer substrate with good electrical properties is a porous honeycomb electret substrate.
The term "porous honeycomb-type electret substrate" refers to a substrate in which the pores are honeycomb-type. In some embodiments, the honeycomb-type electret substrate is a substrate having "6-7mm" diameter and "4-5mm" height honeycomb-type holes.
In some embodiments, the polymer substrate with good electrical properties is a porous W-type electret substrate, a porous U-type electret substrate or a porous honeycomb-type electret substrate.
In some embodiments, the mass ratio of graphene to polyvinylidene fluoride is 1-4%.
In some embodiments, the mass ratio of graphene to polyvinylidene fluoride is 3%.
In some embodiments, the polyvinylidene fluoride substrate is a porous electret substrate.
In some embodiments, the polyvinylidene fluoride substrate is a porous W-type electret substrate, a porous U-type electret substrate, or a porous honeycomb-type electret substrate.
In some embodiments, the mass ratio of graphene to polyacrylonitrile is 1-4%.
In some embodiments, the mass ratio of graphene to polyacrylonitrile is 3%.
In some embodiments, the polyacrylonitrile substrate is a porous electret substrate.
In some embodiments, the polyacrylonitrile substrate is a porous W-type electret substrate, a porous U-type electret substrate, or a porous honeycomb-type electret substrate.
On the other hand, the invention also provides a composite material dynamic electret filter element, and the electret substrate is adopted as electret.
In some embodiments, MOFs electrode films are employed as embedded electrodes for the electret substrate.
In some embodiments, the MOFs electrode film is prepared using the following method:
1) Preparing layered MOFs (optionally Co-MOFs, zn-MOFs or Al-MOFs) comprising the steps of: taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; the solution is reacted under the sealing at 70-90 ℃; reflux reacting the obtained product with 2,3,4,5, 6-pentafluorobenzamine and methanol;
2) The steps of the composite MOFs material and polymer include: coating the layered MOFs prepared in the step 1) on carbon cloth, and controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electropolymerization method.
In some embodiments, the MOFs electrode film is prepared using the following method:
1) Preparation of layered MOFs (optionally Co-MOFs, zn-MOFs or A1-MOFs): taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; the solution is reacted for 24 hours at 85 ℃ under sealing; cooling, filtering, washing with methanol, and drying; reacting the dried product with 2,3,4,5, 6-pentafluorobenzamine and methanol at 70 ℃ for 24 hours; filtering, adding methanol, soaking for 1 day, washing with methanol, and drying;
2) Compounding MOFs materials with polymers: coating the layered MOFs prepared in the step 1) on carbon cloth, controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electro-polymerization method, and rapidly and controllably polymerizing to realize electric conduction among Co-MOFs nano-crystalline particles to prepare the conductive porous electrode with joint flexibility and toughness.
In some embodiments, the MOFs electrode film is prepared using the following method:
1) Preparation of layered MOFs (optionally Co-MOFs, zn-MOFs or A1-MOFs): taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, dissolving and magnetically stirring; transferring the solution into a polytetrafluoroethylene reaction kettle, sealing the solution by using a stainless steel jacket, and placing the solution in an oven at 85 ℃ for reaction for 24 hours; taking out, cooling to room temperature, filtering to obtain pale yellow powder, washing with absolute methanol, filtering for several times, and vacuum drying at room temperature for 6h to obtain the MOF initial material. Taking the initial synthetic material, putting the initial synthetic material into a single-neck flask with 2,3,4,5, 6-pentafluorobenzamide and methanol, and reacting for 24 hours at 70 ℃; soaking the reacted powder in fresh methanol for 1 day, washing with methanol for several times, and vacuum drying to obtain the superhydrophobic MOFs material;
2) Compounding MOFs materials with polymers: the Co-MOFs nano-crystal is coated on the carbon cloth, then conductive polymer is controllably introduced into the surface of the carbon cloth by adopting an in-situ electro-polymerization method, and the electric conduction among Co-MOFs nano-crystal particles is realized while the quick controllable polymerization is realized, so that the conductive porous electrode with combined flexibility and toughness can be prepared.
On the other hand, the invention also provides an air purification and disinfection device, and the composite material dynamic electret filter element is adopted.
The invention relates to a dynamic electret purifying and disinfecting filter element, which mainly relates to technical researches on the aspects of a processing technology, an application mode and the like of the screened dielectric material and functional material composite.
Graphene (graphene) is a novel carbon nanomaterial, and has wide potential application in transparent conductive films, microelectronic devices, composite materials and electrochemical energy storage devices due to good light transmittance, high electron mobility, high elastic modulus, high specific surface area and flexible surface modification capability, and a plurality of scientific research institutions currently carry out relatively wide composite application research on graphene and high polymer materials in China. According to the invention, after the graphene and PVDF polymer are compounded, the flame retardant property and the dielectric property are improved.
MOFs material is a porous crystallization material, consists of organic framework and metal ion, is a material with the strongest ability (specific surface area) for adsorbing and storing gas molecules, and has the specific surface area up to 8000 square meters per gram, which is 10 times of that of active carbon and molecular sieve. The material decomposes harmful organic matters into carbon dioxide and water in a catalytic mode, and can capture a large amount of fine particles through electrostatic adsorption.
The invention carries out technical attack and production process innovation based on the research of the air purification material combining the original electrostatic electret fiber and photocatalysis, adopts a special processing technology to develop the dynamic electret electrostatic purification filter element with low ventilation resistance and high purification efficiency by compounding graphene, MOFs material and PVDF polymer dielectric material, and is matched with various application devices, so that the newly developed product not only meets the requirements of preventing and controlling disease transmission in public places, but also can eliminate other air pollution in indoor environments, and can be widely applied to the indoor environments such as hospitals, stations, office buildings, families and the like.
The innovation points of the invention are that:
1) Graphene and polyvinylidene fluoride (PVDF) are compounded to prepare an electret (electric) composite substrate: the invention discovers that the matching proportion (mass ratio) of the materials and the corresponding processing technological process can lead the modified PVDF electret substrate to reach the flame retardant requirement and the dielectric property requirement, and generate good PM2.5 and adsorption effect of bacteria-carrying particles under the action of static electricity.
2) Fusion of MOFs electrode films with PVDF electret substrate "dynamic electret" (Dynamic Electric Polarization) mechanism: the invention creatively adopts MOFs electrode film to manufacture embedded high-voltage electrode of high-voltage electric field required by dynamic electret, and makes positive and negative ions generated by high-voltage discharge interact with catalytic mechanism of MOFs material to generate high-efficiency degradation of gaseous pollutants and killing of bacterial viruses.
Drawings
FIG. 1 is a schematic illustration of a processing flow of a electret substrate
FIG. 2 is a schematic diagram of a process flow for compounding MOFs with a specific polymer
FIG. 3 is a schematic diagram of a MOFs electrode film as a dynamic electret embedded electrode
FIG. 4 is a graph showing the comparative advantages of a dynamic electret filter cartridge employing the present invention
FIG. 5 is a schematic U-shaped configuration of a dynamic electret filter cartridge incorporating the present invention.
Description of the preferred embodiments
1. Graphene oxide (PVDF) composite
Graphene oxide is adopted as the graphene in the embodiment. The graphene can be prepared in a liquid phase, and the method can improve the yield, so that a higher amount of graphene is obtained. Graphene oxide is a hydrophilic molecule that can be dissolved in water by means of sound waves or stirring. After centrifugation, the graphene oxide must be re-filtered and the solution is aspirated through the vena cava pump. The deposition of graphene on the surface can be accomplished by a simple instillation method, i.e. dropping the solution onto the PVDF substrate. With the aid of centrifugal force, a more uniform coating process can be achieved to disperse the solution. The schematic of the processing flow is shown in figure 1.
2. MOFs material and specific polymer composite
In the embodiment, MOFs materials with flame retardant elements are selected and combined with cobalt (Co) to prepare layered Co-MOFs: taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, dissolving and magnetically stirring; transferring the solution into a polytetrafluoroethylene reaction kettle, sealing the solution by using a stainless steel jacket, and placing the solution in an oven at 85 ℃ for reaction for 24 hours; taking out, cooling to room temperature, filtering to obtain pale yellow powder, washing with absolute methanol, filtering for several times, and vacuum drying at room temperature for 6h to obtain the MOF initial material. Taking the initial synthetic material, putting the initial synthetic material into a single-neck flask with 2,3,4,5, 6-pentafluorobenzamide and methanol, and reacting for 24 hours at 70 ℃; soaking the reacted powder in fresh methanol for 1 day, washing with methanol for several times, and vacuum drying to obtain the superhydrophobic MOFs material.
In order to further reduce the resistance and improve the conductivity of the MOFs, we have proposed to combine MOFs with specific polymers (such as Polyaniline PANI, polyanline) by electrochemical methods: the Co-MOFs nano-crystal is coated on the carbon cloth, then conductive polymer is controllably introduced into the surface of the carbon cloth by adopting an in-situ electro-polymerization method, and the electric conduction among Co-MOFs nano-crystal particles is realized while the quick and controllable polymerization is realized, so that the conductive porous electrode (PANI-ZIF-67-CC) with combined flexibility and toughness can be prepared.
The composite material was tested to have an area capacitance of up to 2146mF cm-2. The schematic of the processing flow is shown in figure 2.
3. MOFs electrode film is used as a dynamic electret embedded electrode, and a 4-6KV externally-applied pulse electric field is arranged, so that the electrostatic field of a traditional electrostatic precipitator 8KV/cm metal electrode plate is improved to be more than 15KV/cm, the sterilization efficiency of the electrostatic field of a filter element is greatly enhanced, meanwhile, the dynamic electret performance is greatly improved, and the good purification efficiency of removing PM2.5 or bacteria-carrying particles is achieved. In particular as shown in figure 3.
Performance reliability and advancement of dynamic electret filter elements
The sterilization principle of the high-voltage pulse electric field is that an instantaneous high-voltage pulse electric field is generated between two electrodes to act on bacteria-containing substances or particles with viruses for sterilization and disinfection. The mechanism of high-voltage pulsed electric field sterilization has been studied for 40 years, forming the following several representative views:
(1) theory of "cell membrane perforation effect": when an external electric field acts on the cells, the cell membranes of the microorganisms are induced to generate transmembrane potentials under the action of the external electric field. When the entire membrane potential reaches a limit value (about 1V), the membrane breaks, causing the membrane structure to become disordered, forming pores, and the permeability is enhanced. Thus, the permeability of the cells may be increased in accordance with the strength of the applied electric field.
(2) Theory of electrolytic products: when an electric field is applied to the electrode points, the electrolyte in the medium near the electrodes is ionized to generate anions, and the anions and the cations are extremely active under the action of a strong electric field, pass through cell membranes with improved permeability under the action of the electric field, and are combined with living substances of cells such as proteins and ribonucleic acid to denature the living substances.
(3) Theory of ozone effect: the liquid medium is electrolyzed under the action of an electric field to generate ozone, and the ozone can effectively kill bacteria under low concentration. However, in air, excessive ozone tends to cause air pollution and health hazards.
By compounding graphene and polyvinylidene fluoride PVDF, on one hand, the dielectric property (about 15 times improvement) of the PVDF substrate is improved by utilizing the good conductive property of the graphene, on the other hand, the flame retardant property of the PVDF substrate can be greatly improved by the graphene under the compounding configuration of 3% of mass ratio, but the structural plasticity of the PVDF resin material cannot be influenced, and the honeycomb type porous electret substrate (the electret substrate can also be made into other holes, such as W-shaped holes and U-shaped holes) can be prepared through specific melting and thermoplastic processing process flows, so that the material problems of high ventilation resistance and low flame retardant property of the polymer electret material are solved, and meanwhile, the electrostatic adsorption capacity and the sterilization performance are also improved. The composite material dynamic electret filter element of the embodiment not only maintains the high-voltage electrostatic dust removal and sterilization functions, but also absorbs the excellent performance of the MOFs material catalytic mechanism for purifying gaseous pollution, and simultaneously improves the performance of preparing the electret base material by compounding graphene and PVDF material, the constructed dynamic electret electrostatic field not only improves the electric field intensity, but also limits ozone pollution, and the flame retardance and sterilization performance of the composite material dynamic electret filter element exceed the performance of IFD products developed by DARDIN company in the UK. The advantage comparison diagram is shown in fig. 4.
The composite material dynamic electret air purifying and disinfecting filter element has good comprehensive purifying function, is temperature-resistant and corrosion-resistant, can be repeatedly used, has a light structure and small ventilation resistance, and can be widely applied to indoor (in-car) environmental air treatment equipment such as an air purifying and disinfecting machine, a vehicle air conditioner, a central air conditioner, a household air conditioner, a fresh air unit and the like. Based on the technical foundation and the product advantages, corresponding application units and overall solutions are specially developed according to application requirements in specific fields such as public places such as hospital environments and transportation hubs, bus environments and the like.
Claims (5)
1. A composite material dynamic electret filter element adopts an electret substrate as an electret, and is characterized in that the electret substrate is formed by depositing graphene on a polymer substrate with good electric polarity, the polymer with good electric polarity is PVDF or PANI, and the graphene is graphene oxide; the deposition is to drop graphene aqueous solution on a polymer substrate with good electric polarity, and uniformly coat the graphene aqueous solution with the help of centrifugal force; the mass ratio of the graphene to the polymer with good electric polarity is 1-4%; the polymer substrate with good electric polarity is a porous W-type electret substrate, a porous U-type electret substrate or a porous honeycomb type electret substrate; the MOFs electrode film is used as an embedded electrode of a electret substrate, and the MOFs electrode film is prepared by the following method:
1) The preparation method of the layered MOFs comprises the following steps: taking zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; the solution is reacted under the sealing at 70-90 ℃; reflux reacting the obtained product with 2,3,4,5, 6-pentafluorobenzamine and methanol;
2) The steps of the composite MOFs material and polymer include: coating the layered MOFs prepared in the step 1) on carbon cloth, and controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electropolymerization method.
2. The composite dynamic electret filter element of claim 1 wherein the mass ratio of graphene to polymer with good electrical polarity is 3%.
3. The composite dynamic electret filter element of claim 1, wherein the MOFs electrode film is prepared by the following method:
1) Preparation of layered MOFs: taking zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; reacting the solution under sealing at 85 ℃ for 24h; cooling, filtering, washing with methanol, and drying; reacting the dried product with 2,3,4,5, 6-pentafluorobenzamine and methanol at 70 ℃ for 24h; filtering, adding methanol, soaking for 1 day, washing with methanol, and drying;
2) Compounding MOFs materials with polymers: coating the layered MOFs prepared in the step 1) on carbon cloth, controllably introducing conductive polymers on the surface of the carbon cloth by adopting an in-situ electro-polymerization method, and rapidly and controllably polymerizing to realize electric conduction among Co-MOFs nano-crystalline particles to prepare the conductive porous electrode with joint flexibility and toughness.
4. A composite dynamic electret filter element according to any one of claims 1-3, said MOFs being Zn-MOFs.
5. An air purification and disinfection device, characterized in that the composite material dynamic electret filter element according to any one of claims 1-3 is used.
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