CN114920971A - PVDF composite graphene dynamic electret filter element - Google Patents
PVDF composite graphene dynamic electret filter element Download PDFInfo
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Abstract
The invention belongs to the field of air filtration, and particularly relates to a PVDF composite graphene dynamic electret filter element. The composite MOFs electrode film is used for manufacturing a high-voltage electrostatic field electrode required by a dynamic electret, and is combined with an electret mechanism of a graphene-polyvinylidene fluoride (GR-PVDF) composite electret substrate, so that a novel dynamic electret air purification mechanism is constructed, and meanwhile, a 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 PVDF composite graphene dynamic electret filter element.
Background
With the progress of the times, the requirements of people on the environmental quality are higher and higher. However, 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 filtering material cannot completely remove fine particles, harmful microorganisms are easy to breed on the filtering material, and the possibility of secondary pollution exists. Since the new crown virus epidemic situation, the national regulatory authorities have strengthened epidemic prevention and disinfection in public places and indoor environments, and this respiratory infectious disease is easily infected by people through droplets and aerosols flowing through air, so air disinfection in indoor environments becomes very important.
Electret air filter material offers the possibility to solve this problem. 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 functions of inhibiting and killing bacteria. In China, a professor team of Liulifang and Butin university of east China develops and utilizes an electrostatic spinning technology to prepare the polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membrane with excellent antibacterial performance, the antibacterial rate of the polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membrane on staphylococcus aureus can reach more than 99%, and the polyvinylidene fluoride PVDF/PSU composite antibacterial nanofiber membrane has a good antibacterial effect. The polypropylene and polystyrene electret fiber membranes were also synthesized by professor Jooyoun Kim of korea seoul national university by electrospinning, and the results showed that the fluorinated polypropylene fiber membranes had excellent particulate filtering performance and bacteriostatic activity against staphylococcus aureus. However, researchers often integrate electret materials such as PVDF into air purification filter materials by electrostatic spinning technology, which causes the defects of large wind resistance pressure and low flame retardant property of the system, and the product often selected is a high-voltage electrostatic purification and disinfection device, but the product has a large volume, is difficult to install, and is easy to generate ozone pollution.
Disclosure of Invention
In order to solve some existing problems, the invention provides an electret substrate and a dynamic electret filter core prepared by adopting the electret substrate. The air purification equipment using the dynamic electret filter element provided by the invention can meet the disease prevention and control transmission requirements of public places, can eliminate other air pollution in indoor environments, and can be widely applied to indoor (in-vehicle) environments of public places or private places such as rail transit, hospitals, stations, office buildings, families and the like.
In particular, the method comprises the following steps of,
in one aspect, the present invention provides an electret substrate that is obtained by depositing graphene on a polymer substrate with good electrical properties.
In some embodiments, the polymer with good electrode performance is PVDF or PANI; PVDF is polyvinylidene fluoride, and PANI is polyacrylonitrile.
In some embodiments, the graphene is graphene oxide.
In some embodiments, the deposition is by a drop-cast method.
In some embodiments, the deposition is dropping graphene aqueous solution on a polymer substrate with good electrode performance, and the graphene aqueous solution is uniformly coated with the help of centrifugal force.
In some embodiments, the mass ratio of the graphene to the polymer with good electrical properties is 1-4%.
In some embodiments, the mass ratio of the graphene to the polymer with good electrical properties is 3%.
In some embodiments, the polymer substrate with good electrode performance is a porous electret substrate.
In some embodiments, the polymer substrate with good electrode performance is a porous W-type electret substrate.
In some embodiments, the polymer substrate with good electrode performance is a porous U-shaped electret substrate.
In some embodiments, the polymer substrate with good electrode performance is a porous honeycomb electret substrate.
In some embodiments, the polymer substrate with good electrode performance is a porous W-type electret substrate, a porous U-type electret substrate, or a porous honeycomb electret substrate.
On the other hand, the invention also provides a composite material dynamic electret filter core, and the electret substrate is adopted as the electret.
In some embodiments, the MOFs electrode film is used as an embedded electrode of an electret substrate.
In some embodiments, the MOFs electrode film is prepared by 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; reacting the solution at 70-90 ℃ under sealing; the obtained product is subjected to reflux reaction with 2, 3, 4, 5, 6-pentafluorobenzylamine and methanol;
2) the MOFs material and polymer are compounded, and the steps comprise: coating the layered MOFs prepared in the step 1) on carbon cloth, and introducing conductive polymers on the surface of the carbon cloth in a controllable manner by adopting an in-situ electropolymerization method.
In some embodiments, the MOFs electrode films are prepared by the following method:
1) preparing 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-pentafluorobenzylamine 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, introducing conductive polymers on the surface of the carbon cloth in a controllable and low-level manner by adopting an in-situ electropolymerization method, realizing electric conduction among Co-MOFs nano crystal particles while realizing rapid and controllable polymerization, and preparing the conductive porous electrode with combined 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.
On the basis of the research of the air purification and disinfection technology combining high-voltage static electricity and photocatalysis materials, the invention provides a research scheme combining a specific composite material and a high-voltage static electricity mechanism, and realizes good air purification and disinfection effects through a dynamic electret mechanism constructed by the composite material.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, which are intended to cover all alternatives, modifications, and equivalents, which may be included within the scope of the present 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 that one or more of the incorporated documents, patents, and similar materials differ from or contradict this application (including but not limited to defined terminology, terminology application, described techniques, and so on), this 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.
In one aspect, the present invention provides an electret substrate, which is obtained by depositing graphene on a polymer substrate with good electrical properties.
The term "polymer with good electrode properties" refers to an organic polymer with good motor properties, non-limiting examples include polyvinylidene fluoride, polyacrylonitrile.
In some embodiments, the polymer with good electrode performance is PVDF or PANI; PVDF is polyvinylidene fluoride, and PANI is polyacrylonitrile.
In some embodiments, the polymer with good electrode performance is PVDF.
In one aspect, the present disclosure provides an electret substrate, which is obtained by depositing graphene on a polyvinylidene fluoride substrate.
In some embodiments, the graphene is graphene oxide.
In some embodiments, the deposition is by a drop-cast method.
In some embodiments, the deposition is dropping graphene aqueous solution on a polymer substrate with good electrode performance, and the graphene aqueous solution is uniformly coated with the help of centrifugal force.
In some embodiments, the depositing is dropping aqueous graphene solution on polyvinylidene fluoride substrate, with the help of centrifugal force, a uniform coating film.
In some embodiments, the mass ratio of the graphene to the polymer with good electrical properties is 1-4%.
In some embodiments, the mass ratio of the graphene to the polymer with good electrical properties is 3%.
In some embodiments, the polymer substrate with good electrode performance is a porous electret substrate.
In some embodiments, the polymer substrate with good electrode performance is a porous W-type electret substrate.
The term "porous W-type electret substrate" means that the pores on the substrate are W-shaped. In some embodiments, the W-shaped electret substrate is a substrate with W-shaped holes having sides of "4-6 mm" and spacing of "4-6 mm".
In some embodiments, the polymer substrate with good electrode performance is a porous U-shaped electret substrate.
The term "porous U-shaped electret substrate" means that the pores on the substrate are U-shaped. In some embodiments, the U-shaped electret substrate is a substrate with U-shaped holes having sides of "4-6 mm" and a spacing of "0.4-0.6 mm".
In some embodiments, the polymer substrate with good electrode performance is a porous honeycomb electret substrate.
The term "porous honeycomb electret substrate" means that the pores on the substrate are honeycomb. In some embodiments, the honeycomb electret substrate is a substrate with honeycomb-type holes of "6-7 mm" diameter and "4-5 mm" height.
In some embodiments, the polymer substrate with good electrode performance is a porous W-type electret substrate, a porous U-type electret substrate, or a porous honeycomb electret substrate.
In some embodiments, the mass ratio of graphene to polyvinylidene fluoride is 1-4%.
In some embodiments, the graphene to polyvinylidene fluoride mass ratio 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-electret substrate, a porous U-electret substrate, or a porous honeycomb electret substrate.
In some embodiments, the mass ratio of graphene to polyacrylonitrile is 1-4%.
In some embodiments, the graphene to polyacrylonitrile mass ratio is 3%.
In some embodiments, the polyacrylonitrile substrate is a porous electret substrate.
In some embodiments, the polyacrylonitrile substrate is a porous W-electret substrate, a porous U-electret substrate or a porous honeycomb electret substrate.
On the other hand, the invention also provides a composite material dynamic electret filter core, and the electret substrate is adopted as the electret.
In some embodiments, the MOFs electrode film is used as an embedded electrode of an electret substrate.
In some embodiments, the MOFs electrode films are prepared by the following method:
1) preparing layered MOFs (optionally Co-MOFs, Zn-MOFs or Al-MOFs) by steps comprising: taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol, stirring and dissolving; reacting the solution at 70-90 ℃ under sealing; carrying out reflux reaction on the obtained product, 2, 3, 4, 5, 6-pentafluorobenzylamine and methanol;
2) the MOFs material and polymer are compounded, and the steps comprise: coating the layered MOFs prepared in the step 1) on carbon cloth, and introducing conductive polymers on the surface of the carbon cloth in a controllable manner by adopting an in-situ electropolymerization method.
In some embodiments, the MOFs electrode film is prepared by the following method:
1) preparing 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-pentafluorobenzylamine 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, introducing conductive polymers on the surface of the carbon cloth in a controllable and low-level manner by adopting an in-situ electropolymerization method, realizing electric conduction among Co-MOFs nano crystal particles while realizing rapid and controllable polymerization, and preparing the conductive porous electrode with combined flexibility and toughness.
In some embodiments, the MOFs electrode films are prepared by the following method:
1) preparing 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 and dissolving, and magnetically stirring; transferring the solution into a polytetrafluoroethylene reaction kettle, sealing the reaction kettle by using a stainless steel jacket, and placing the reaction kettle in an oven at 85 ℃ for reaction for 24 hours; taking out, cooling to room temperature, filtering to obtain light yellow powder, washing with anhydrous methanol, filtering for several times, and vacuum drying at room temperature for 6h to obtain initial MOF material. Taking the initial synthetic material, putting 2, 3, 4, 5, 6-pentafluorobenzylamine and methanol in a single-neck flask, 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 super-hydrophobic MOFs material;
2) compounding MOFs materials with polymers: the Co-MOFs nano-crystal is coated on the carbon cloth, then the conductive polymer is introduced into the surface of the carbon cloth in a controllable and low-level manner by adopting an in-situ electropolymerization method, the electric conduction among the Co-MOFs nano-crystal particles is realized while the rapid and controllable polymerization is carried out, and the conductive porous electrode with the combined flexibility and toughness can be prepared.
On the other hand, the invention also provides an air purification and disinfection device which adopts the composite material dynamic electret filter element.
The invention relates to a dynamic electret purification and disinfection filter element, which mainly relates to the technical research on the aspects of the processing technology, the application mode and the like of the composition of screened dielectric materials and functional materials.
Graphene (graphene) is a novel carbon nano material, 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 is widely applied to research of composite application of graphene and high polymer materials by a plurality of domestic scientific research institutes at present. According to the invention, graphene and PVDF polymer are compounded, so that the flame retardant property and the dielectric property are improved.
The MOFs material is a porous crystalline material, consists of an organic framework and metal ions, is a material with the strongest gas molecule adsorption and storage capacity (specific surface area) in the world at present, has the specific surface area of up to 8000 square meters per gram, and is more than 10 times that of activated carbon and molecular sieves. The material decomposes harmful organic substances 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 on the basis of the research on the air purification material combining the original electrostatic electret fiber and photocatalysis, by selecting and combining graphene and MOFs materials with PVDF high-molecular dielectric materials, adopting a specific processing process to develop the dynamic electret electrostatic purification filter element with low ventilation resistance and high purification efficiency, and matching with various application equipment, the newly developed product not only meets the prevention and control disease transmission requirements of public places, but also can eliminate other air pollution in indoor environment, and can be widely applied to indoor environments such as hospitals, stations, office buildings, families and the like.
The invention has the innovation points that:
1) preparing an electret composite substrate by compounding graphene and polyvinylidene fluoride (PVDF): the matching proportion (mass ratio) of the materials and the corresponding processing process flow can enable the modified PVDF electret substrate to meet the requirements of flame retardance and dielectric property, and generate good adsorption of PM2.5 and bacteria-carrying particles under the action of static electricity.
2) Fusion of MOFs electrode film and PVDF electret substrate "Dynamic Polarization" (Dynamic Electric Polarization) mechanism: the invention creatively adopts the MOFs electrode film to manufacture the embedded high-voltage electrode of the high-voltage electric field required by the dynamic electret, and enables positive and negative ions generated by high-voltage discharge to interact with a catalytic mechanism of the MOFs material, thereby generating high-efficiency gaseous pollutant degradation and killing bacteria and viruses.
Drawings
FIG. 1 is a schematic view of an electret substrate processing flow
FIG. 2 is a schematic view of the processing flow of MOFs materials and specific polymers
FIG. 3 is a schematic diagram of an MOFs electrode film as a dynamic electret embedded electrode
FIG. 4 is a schematic diagram showing the comparison of advantages of a dynamic electret filter element using the present invention
Fig. 5 is a schematic view of a U-shape of a dynamic electret filter cartridge according to the invention.
Detailed description of the preferred embodiment
Compounding Graphene oxide and polyvinylidene fluoride
Graphene oxide is used as graphene in the embodiment. Graphene can be prepared in a liquid phase, and this method can improve yield, thereby obtaining higher graphene amount. 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 aspirated by a membrane vena cava pump. Deposition of graphene on the surface can be accomplished by a simple drip method, i.e. dropping the solution on a PVDF substrate. With the help of centrifugal force, a more uniform coating process can be achieved to disperse the solution. The process flow is schematically shown in FIG. 1.
Second, MOFs material and specific polymer composite
In this embodiment, MOFs materials with flame retardant elements are selected and combined with cobalt element (Co) to prepare layered Co-MOFs: taking a certain amount of zinc nitrate hexahydrate, imidazole-2-formaldehyde and sodium formate, adding methanol and dissolving, and magnetically stirring; transferring the solution into a polytetrafluoroethylene reaction kettle, sealing the reaction kettle by using a stainless steel outer sleeve, and placing the reaction kettle in an oven at 85 ℃ for reaction for 24 hours; taking out, cooling to room temperature, filtering to obtain light yellow powder, washing with anhydrous methanol, filtering for several times, and vacuum drying at room temperature for 6h to obtain initial MOF material. Taking the initial synthetic material, putting 2, 3, 4, 5, 6-pentafluorobenzylamine and methanol in a single-neck flask, 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 super-hydrophobic MOFs material.
In order to further reduce the resistance and improve the conductivity of MOFs materials, we intend to compound MOFs materials with specific polymers (such as Polyaniline PANI, Polyaniline) by an electrochemical method, and the method is as follows: the Co-MOFs nano-crystal is coated on the carbon cloth, then the conductive polymer is introduced on the surface of the carbon cloth in a controllable and low-level manner by adopting an in-situ electropolymerization method, the electric conduction among the Co-MOFs nano-crystal particles is realized while the rapid and controllable polymerization is carried out, and the conductive porous electrode (PANI-ZIF-67-CC) with the combined flexibility and toughness can be prepared.
According to experimental tests, the composite material has an area capacitance as high as 2146mF cm < -2 >. The process flow is schematically shown in figure 2.
And thirdly, the MOFs electrode film is used as a dynamic electret embedded electrode, and a 4-6KV external pulse electric field is arranged, so that the electrostatic field of a traditional electrostatic dust collector with a metal electrode plate of 8KV/cm is improved to be more than 15KV/cm, the sterilization efficiency of the electrostatic field of the filter element is greatly enhanced, the dynamic electret performance is greatly improved, and the good purification efficiency for removing PM2.5 or bacteria-carrying particles is achieved. As shown in fig. 3.
Performance reliability and advancement of dynamic electret filter element
The sterilization principle of the high-voltage pulse electric field is that a transient high-voltage pulse electric field is generated between two electrodes and acts on bacteria-containing substances or virus-carrying particles to sterilize and disinfect. The high-voltage pulse electric field sterilization mechanism is studied for 40 years, and the following representative viewpoints are formed:
theory of cell membrane perforation effect: when an external electric field is applied to the cell, the cell membrane of the microorganism induces a cross-membrane potential under its action. When the whole membrane potential reaches a limit value (about 1V), the membrane is broken, the membrane structure becomes disordered, pores are formed, and the permeability is enhanced. Thus, the permeability of the cells may be increased in response to an increase in the intensity of the applied electric field.
Theory of electrolysis products: when an electric field is applied to the electrode points, electrolytes in a medium near the electrodes are ionized to generate anions, and the anions 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 cell living substances such as proteins and ribonucleic acid to denature the cells.
Theory of ozone effect: under the action of electric field, the liquid medium is electrolyzed to produce ozone, which can kill bacteria effectively at low concentration. However, in the air, the excessive ozone easily causes air pollution and health hazard.
By adopting the compounding of the graphene and the PVDF, on one hand, the dielectric property of the PVDF base material is improved by utilizing the good conductive property of the graphene (about 15 times higher), on the other hand, the flame retardant property of the PVDF base material can be greatly improved by the graphene under the compounding configuration of 3% of the mass ratio, but the structural plasticity of the PVDF resin material is not influenced, the honeycomb type porous electret substrate (the electret substrate can be made into other hole patterns such as a W-shaped hole pattern and a U-shaped hole pattern) can be prepared by a specific melting and thermoplastic processing process flow, 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 property are also improved. The composite material dynamic electret filter element of the embodiment not only retains the functions of high-voltage electrostatic dust removal and sterilization, but also absorbs the excellent performance of MOFs material catalysis mechanism for purifying gaseous pollution, and simultaneously, the performance of the electret substrate prepared by compounding graphene and PVDF material is improved, the constructed dynamic electret electrostatic field not only improves the electric field strength but also limits ozone pollution, and the flame retardance and sterilization performance of the composite material dynamic electret filter element exceed the IFD (organic field Detector) product performance developed by DARWIN company in Britain. The comparison of advantages is schematically shown in fig. 4.
The composite material dynamic electret air purification and disinfection filter core has good comprehensive purification 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-vehicle) environment air treatment equipment such as air purification and disinfection machines, vehicle air conditioners, central air conditioners, household air conditioners, fresh air handling units and the like. Based on the technical basis and the product advantages, the corresponding application units and the overall solution are specially developed according to the application requirements of specific fields such as public places such as hospital environments, transportation hubs and the like and bus environments and the like.
Claims (8)
1. An electret substrate is characterized in that graphene is deposited on a polymer substrate with good electrode performance;
optionally, the polymer with good electrode performance is PVDF or PANI.
Optionally, the graphene is graphene oxide;
optionally, the deposition is performed by a dropping method;
optionally, the deposition is to uniformly coat the graphene on a polymer substrate with good electrode performance by dripping the graphene aqueous solution on the polymer substrate with the help of centrifugal force.
2. The electret substrate of claim 1, wherein the mass ratio of graphene to the polymer with good electrical properties is 1-4%;
optionally, the mass ratio of the graphene to the polymer with good electrode performance is 3%.
3. The electret substrate of claim 1, wherein the polymer substrate with good electrode properties is a porous electret substrate;
optionally, the polymer substrate with good electrode performance is a porous W-shaped electret substrate, a porous U-shaped electret substrate or a porous honeycomb electret substrate.
4. A composite dynamic electret filter element, wherein the electret substrate according to any one of claims 1 to 3 is used as an electret.
5. The dynamic electret filter of claim 4 wherein the MOFs electrode film is used as an in-line electrode for the electret substrate.
6. The dynamic electret filter core of claim 5, wherein said MOFs electrode film is prepared by 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; reacting the solution at 70-90 ℃ under sealing; carrying out reflux reaction on the obtained product, 2, 3, 4, 5, 6-pentafluorobenzylamine and methanol;
2) the MOFs material and polymer are compounded, and the steps comprise: coating the layered MOFs prepared in the step 1) on carbon cloth, and introducing conductive polymers on the surface of the carbon cloth in a controllable manner by adopting an in-situ electropolymerization method.
7. The dynamic electret filter core of claim 5 wherein the MOFs electrode film is prepared by the following method:
1) preparing 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-pentafluorobenzylamine 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, introducing conductive polymers on the surface of the carbon cloth in a controllable manner by adopting an in-situ electropolymerization method, realizing electric conduction among Co-MOFs nano-crystalline particles while realizing rapid and controllable polymerization, and preparing the conductive porous electrode with combined flexibility and toughness.
8. An air purification and disinfection device, characterized in that a composite material dynamic electret filter element according to any one of claims 4-7 is adopted.
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