CN114653209B - Preparation method and application of magnetic conductive microfiltration membrane - Google Patents
Preparation method and application of magnetic conductive microfiltration membrane Download PDFInfo
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- CN114653209B CN114653209B CN202210279601.5A CN202210279601A CN114653209B CN 114653209 B CN114653209 B CN 114653209B CN 202210279601 A CN202210279601 A CN 202210279601A CN 114653209 B CN114653209 B CN 114653209B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/147—Microfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/102—Permeable membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/26—Electrical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/46—Magnetic properties
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a preparation method of a magnetic conductive micro-filtration membrane, which comprises the following steps: dissolving polyvinylpyrrolidone and polyvinylidene fluoride in dimethylacetamide, and uniformly stirring to form a mixed solution; ammonium persulfate is added into the mixed solution, and then pyrrole is added and stirred uniformly to form suspension; adding magnetic particles into the suspension, and uniformly stirring to form a casting solution; the casting solution is stored to remove bubbles, the casting solution is coated on a glass plate, an external magnetic field is applied to control the magnetization direction of magnetic particles while coating, a coating with the thickness of 100-300 mu m is obtained, after standing, the glass plate with the coating is immersed in a tap water bath, and the magnetic conductive micro-filtration membrane is obtained, so that the magnetic conductive micro-filtration membrane has good filtration performance and stability. The magnetic conductive microfiltration membrane is used as a filter membrane and an anode, has a good sewage treatment effect, and is not easy to pollute.
Description
Technical Field
The invention relates to the technical field of MBR membrane preparation, in particular to a preparation method and application of a magnetic conductive micro-filtration membrane.
Background
Microbial Fuel Cells (MFCs) are clean energy technology and emerging sustainable wastewater treatment technology that can utilize electroactive microorganisms to oxidize organics in wastewater and directly obtain electrical energy from the wastewater. The anode microorganism transfers electrons generated when catabolizing the substrate to the anode in a direct or indirect way, and the electrons react with hydrogen ions and oxygen near the cathode to generate water through an external circuit, but the wastewater is difficult to reach the standard when the MFC is singly used for treating, and the generated electric energy is difficult to be effectively utilized and collected.
The Membrane Bioreactor (MBR) is a novel efficient sewage treatment technology combining sewage biological treatment and membrane separation, has the advantages of good sewage treatment effect, small occupied area, high automation degree, low sludge yield and the like, but can also shorten the service life of a membrane due to membrane pollution caused by deposition of granular or viscous organic matters on the surface of the membrane (reversible pollution) or membrane holes (irreversible pollution), and increases the running cost of the MBR, thereby limiting the wide application of the membrane bioreactor.
Currently, methods for mitigating membrane fouling mainly include: novel membrane materials with excellent properties (such as high mechanical strength, good water flux and high surface area) are employed; process conditions (backwash frequency and solids residence time) are improved; optimizing system design (e.g., aeration). However, the above strategies have focused mainly on reversible membrane fouling, which is not very effective for long-term operation, and which is not effective for slowing down membrane fouling.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method and application of a magnetic conductive micro-filtration membrane, and aims to improve the filtration performance of the membrane and reduce the membrane pollution.
The technical scheme adopted by the invention is as follows:
in one aspect, the invention provides a method for preparing a magnetic conductive microfiltration membrane, comprising the following steps:
dissolving polyvinylpyrrolidone and polyvinylidene fluoride in dimethylacetamide, and uniformly stirring to form a mixed solution:
ammonium persulfate is added into the mixed solution, pyrrole is added, and the mixed solution is stirred uniformly to form suspension;
adding magnetic particles into the suspension, and uniformly stirring to form a casting solution;
storing the casting solution to remove bubbles, coating the casting solution on a glass plate, applying an external magnetic field to control the magnetization direction of the magnetic particles while coating to obtain a coating with the thickness of 100-300 mu m, and standing;
immersing the glass plate with the coating into a tap water bath, and then stripping the coating from the glass plate to obtain the magnetic conductive microfiltration membrane.
The further technical scheme is as follows:
the addition amount of the ammonium persulfate is 10% of the mass of the mixed solution, and the addition amount of the pyrrole is 1% -3% of the mass of the mixed solution.
The addition amount of the magnetic particles is 20% -60% of the mass of pyrrole.
The polyvinyl pyrrolidone accounts for 1-10wt% of the mixed solution, and the polyvinylidene fluoride accounts for 10-20wt% of the mixed solution.
The magnetic particles adopt AlNiCo particles, feCrCo particles, ndFeB particles, fe-based particles and Fe 3 O 4 One or more of the particles and Co-based particles.
The external magnetic field is a uniform magnetic field, so that the magnetic particles in the casting film liquid are magnetized along the same direction.
The direction of the external magnetic field is perpendicular to the surface of the glass plate.
On the other hand, the invention provides an application of the magnetic conductive microfiltration membrane prepared by the preparation method of the magnetic conductive microfiltration membrane, which is applied to an MFC-MBR coupling system, wherein the magnetic conductive microfiltration membrane is used as an MFC anode and an MBR filtration membrane so as to reduce membrane pollution.
The beneficial effects of the invention are as follows:
compared with the traditional PVDF micro-filtration membrane, the magnetic conductive micro-filtration membrane prepared by the preparation method has good filtration performance and stability. The prepared magnetic conductive micro-filtration membrane is applied to an MFC-MBR reactor, and is used as a filtration membrane and an anode, so that the sewage treatment effect is good, and the membrane is not easy to be polluted.
The invention has the following specific advantages:
the high-conductivity polypyrrole is used as a conductive material, a conductive path is established in the micro-filtration membrane, and the prepared magnetic conductive micro-filtration membrane has high conductivity.
The membrane pollution is effectively reduced, on one hand, the surface dirt of the membrane is degraded by anode microorganisms, and the reversible pollution is reduced; on the other hand, magnetic particles contained in the magnetic conductive microfiltration membrane generate a magnetic field parallel to the membrane surface and the membrane pores, and electrons generated by oxidizing organic matters by anode microorganisms are distributed to the degradation-resistant organic matters on the surface of the reduction membrane and in the membrane pores more, so that irreversible pollution is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
FIG. 2 is a schematic diagram of the casting solution prepared in example 1 of the present invention.
FIG. 3 is a schematic diagram of the operation of the invention in example 1 to produce magnetically conductive microfiltration membranes.
Fig. 4 is a schematic exploded view of a circular membrane module according to embodiment 2 of the present invention.
FIG. 5 is a schematic diagram of electron movement and stress on the surface (in the membrane pores) of a magnetic conductive microfiltration membrane according to the invention.
In the figure: 1. a beaker; 2. casting film liquid; 3. NdFeB particles; 4. a glass rod; 5. a glass sheet mold; 6. a permanent magnet; 7. a magnetic conductive microfiltration membrane; 8. a stainless steel plate frame; 9. a silica gel pad; 10. a stainless steel support frame; 11. and (5) reserving holes.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
The application provides a preparation method of a magnetic conductive microfiltration membrane, which comprises the following steps:
dissolving polyvinylpyrrolidone and polyvinylidene fluoride in dimethylacetamide, and uniformly stirring to form a mixed solution;
ammonium persulfate is added into the mixed solution, and then pyrrole is added and stirred uniformly to form a suspension;
adding magnetic particles into the suspension, and uniformly stirring to form a casting solution;
storing the casting solution to remove bubbles, coating the casting solution on a glass plate, applying an external magnetic field to control the magnetization direction of the magnetic particles while coating to obtain a coating with the thickness of 100-300 mu m, and standing;
the coated glass plate was immersed in a tap water bath to remove the residual dimethylacetamide, and then the coating was peeled off from the glass plate to obtain a magnetic conductive microfiltration membrane.
The polyvinyl pyrrolidone accounts for 1-10wt% of the mixed solution, and the polyvinylidene fluoride accounts for 10-20wt% of the mixed solution. The stirring process for forming the mixed solution comprises the following steps: stir at room temperature for 6h.
The addition amount of the ammonium persulfate is 10% of the mass of the mixed solution, and the addition amount of the pyrrole is 1% -3% of the mass of the mixed solution.
The addition amount of the magnetic particles is 20% -60% of the mass of pyrrole.
The magnetic particles have magnetism, and can be AlNiCo particles, feCrCo particles, ndFeB particles, fe-based particles, or Fe 3 O 4 One or more of the magnetic particles such as particles and Co-based particles.
And standing the casting film liquid for 1-3h for storage to remove bubbles.
The external magnetic field is a uniform magnetic field, so that the magnetic particles in the casting film liquid are magnetized along the same direction.
The direction of the external magnetic field is perpendicular to the surface of the glass plate.
The application also provides an application of the magnetic conductive microfiltration membrane obtained according to the preparation method of the magnetic conductive microfiltration membrane, which is applied to an MFC-MBR coupling system, and the magnetic conductive microfiltration membrane is used as an MFC anode and an MBR filtration membrane so as to relieve membrane pollution.
The preparation method of the magnetic conductive microfiltration membrane comprises the steps of mixing conductive materials and magnetic materials into casting solution, spreading the casting solution on a customized glass plate mold, controlling the orientation direction of the magnetic materials by an externally applied magnetic field, and preparing the magnetic conductive microfiltration membrane by a phase inversion method.
The prepared magnetic conductive micro-filtration membrane is applied to an MFC-MBR coupling system, and is used as an MFC anode and an MBR filtration membrane, so that the sewage treatment effect is good and the membrane is not easy to pollute.
The magnetic conductive micro-filtration membrane can realize continuous high-quality water outlet as an MBR filtration medium, and simultaneously is used as an MFC anode to construct a bioelectrochemical system, so that the membrane surface and organic matters in the membrane pores are promoted to be degraded in situ, and simultaneously, the magnetic material is embedded in the membrane to generate a magnetic field parallel to the membrane surface so as to change the movement direction of electrons in the anode membrane, reduce the organic matters which are difficult to degrade in the membrane pores and effectively inhibit membrane pollution. Compared with the traditional PVDF micro-filtration membrane, the membrane has good filtration performance and stability.
Wherein pyrrole is used as a conductive raw material, ammonium persulfate is used as an oxidant, polypyrrole is formed after the pyrrole is oxidized, and a conductive path can be established in the microfiltration membrane, so that the organic microfiltration membrane with high conductivity is prepared.
The magnetic particles can generate magnetic fields parallel to the membrane surface and the membrane pores, and electrons generated by oxidizing organic matters by anode microorganisms are distributed more on the surface of the reduction membrane and the refractory organic matters in the membrane pores in the application process, so that irreversible pollution is reduced, and effective control of membrane pollution is realized.
The following specific examples further illustrate the preparation method and specific technical schemes of the application of the magnetic conductive microfiltration membrane.
Example 1
Referring to fig. 1, a preparation method of a magnetic conductive micro-filtration membrane comprises the following specific steps:
step 1: 8wt% of polyvinylpyrrolidone and 15wt% of polyvinylidene fluoride were dissolved in 100ml of dimethylacetamide while stirring at room temperature for 6 hours, and a mixed solution was obtained in a beaker 1;
step 2: adding 10% ammonium persulfate as an oxidant into the mixed solution, adding 2mL of pyrrole into the solution, and stirring for 6h;
step 3: adding the magnetic NdFeB particles 3 into the mixed solution, and stirring for 6 hours to obtain a suspension serving as a casting solution 2, wherein the addition amount of the magnetic particles is 20% of the mass of pyrrole, and the prepared casting solution 2 is shown in fig. 2;
step 4: the casting solution 2 was stored for 24 hours to remove bubbles. Subsequently, as shown in FIG. 3, the casting solution 2 was drained onto a custom-made glass plate mold 5 using a glass rod 4 while controlling the orientation direction of the magnetic particles by applying an external magnetic field with a permanent magnet 6, to obtain a coating layer having a thickness of 300 μm, and left for 3 hours. In fig. 3B shows the direction of the applied external magnetic field, which is a uniform magnetic field.
Step 5: the coated glass plate mold 5 was immersed in a tap water bath for at least 24 hours to remove the remaining dimethylacetamide, and the resulting coating was peeled off from the plate to obtain a magnetically conductive microfiltration membrane 7 having good conductivity and filtration performance.
Example 2
An application of a magnetic conductive microfiltration membrane, comprising:
as shown in fig. 4, two magnetic conductive microfiltration membranes 7 prepared in example 1 are coated on two sides of a stainless steel support frame 10, a guide plate is left in the stainless steel support frame 10, two waterproof silica gel pads 9 are respectively coated on the membrane, two stainless steel plate frames 8 with fixing function are respectively coated on the two silica gel pads 9, preformed holes 11 are formed in the stainless steel support frame 10, the two waterproof silica gel pads 9 and the two stainless steel plate frames 8, and the stainless steel support frame 10, the two magnetic conductive microfiltration membranes 7, the two silica gel pads 9 and the two stainless steel plate frames 8 are pressed and fixed through the preformed holes 11 by using stainless steel screws and nuts, so that a circular membrane assembly is obtained.
The circular membrane assembly is arranged in an integrated MFC-MBR reactor, the circular membrane assembly is used as an MFC anode membrane assembly, the activated carbon felt is used as an air cathode of the MFC, and the structure of the MFC-MBR reactor also comprises a water inlet peristaltic pump, a water outlet peristaltic pump, an external resistor and an MBR reaction tank (the circular membrane assembly is also an MBR filter membrane). The external resistor is a constant resistor or a variable resistor with the resistance of 10 to 10000 omega. In the embodiment, 500 ohm external resistor is selected, and the cathode, the anode and the external resistor are respectively connected through titanium wires.
The volume of the MBR reaction tank is 4.5L, the COD of the inflow water is 500mg/L, the suspended solid content of the mixed solution is 7566mg/L, and the effective filtering area of the magnetic conductive micro-filtration membrane is 52cm 2 And pumping the membrane effluent by using an effluent peristaltic pump, controlling the membrane flux to be 1.5mL/min respectively, and connecting a pressure gauge between the anode membrane assembly and the effluent peristaltic pump.
And in the starting stage of the reactor, an external circuit is disconnected, a water outlet peristaltic pump is closed, water overflows, the potential difference of the two poles is monitored, when the potential difference reaches more than 400mV, the anode is enriched with electrochemically active microorganisms, the external circuit is connected, a resistor is inserted, and the water outlet peristaltic pump is opened.
During operation, the granular or viscous organic matters blocking the membrane pores in the MBR membrane pollution are utilized by the electrochemically active microorganisms enriched on the magnetic conductive membrane material, so that the reversible pollution is reduced. That is, the anode membrane component oxidizes and decomposes the dirt on the surface of the membrane, mainly complex organic matters such as protein, polysaccharide and the like, once the decomposition rate is about equal to or higher than the growth rate of the dirt, the dirt is not accumulated or even relieved, so that the MBR stably operates. In the process, a part of electrons generated by electrochemical microorganisms are conducted to the surface of the anode membrane and are transferred to the cathode through the titanium wire to generate electric energy, a part of electrons are accepted by refractory organic matters and undergo reduction reaction to break bonds, and NdFeB particles generate a magnetic field parallel to the surface of the membrane to facilitate the degradation of the organic matters on the surface (in the membrane pores) of the membrane by the electrons. That is, electrons generated by the oxidation of organic matters by anode microorganisms are transferred to the outside of cells, and after the electrons are transferred to the outside of cells, two utilization modes exist, one part is directly conducted from the anode to the cathode to be used for generating electricity by MFC-MBR, and the other part is distributed to reduce fouling of the surface of the anode membrane and even membrane pores.
Fig. 5 is a schematic diagram showing the electron movement and stress on the surface (in the membrane pores) of the magnetic conductive micro-filtration membrane according to the present embodiment. Fig. 5 (a) and (b) are schematic diagrams of movement of electrons on the membrane surface (in the membrane pores) and schematic diagrams of stress of electrons on the membrane surface (in the membrane pores), respectively. The NdFeB particles can generate a magnetic field B parallel to the membrane surface in the membrane surface and the membrane hole, electrons moving towards the membrane surface are subjected to Lorentz force F parallel to the membrane surface, so that the electrons are caused to deviate in a direction parallel to the membrane surface, more electrons are distributed to reduce refractory organic matters in the membrane surface and the membrane hole, and irreversible pollution is reduced.
The average effluent COD removal rate of the MFC-MBR reactor is 85%, the time for the transmembrane pressure difference to reach 35kPa is 50 days, and the effective working time is far higher than that of an MBR using a traditional PVDF membrane.
The magnetic conductive micro-filtration membrane of the embodiment is applied to an MFC-MBR coupling system, not only plays a role in filtration, but also is used as an MFC anode, and can achieve the effects of better effluent quality, energy consumption reduction and membrane pollution reduction.
Those of ordinary skill in the art will appreciate that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The preparation method of the magnetic conductive microfiltration membrane is characterized by comprising the following steps of:
dissolving polyvinylpyrrolidone and polyvinylidene fluoride in dimethylacetamide, and uniformly stirring to form a mixed solution;
ammonium persulfate is added into the mixed solution, pyrrole is added, and the mixed solution is stirred uniformly to form suspension;
adding magnetic particles into the suspension, and uniformly stirring to form a casting solution;
storing the casting solution to remove bubbles, coating the casting solution on a glass plate, applying an external magnetic field to control the magnetization direction of the magnetic particles while coating to obtain a coating with the thickness of 100-300 mu m, and standing;
immersing the glass plate with the coating into a tap water bath, and then stripping the coating from the glass plate to obtain a magnetic conductive micro-filtration membrane;
the magnetic particles adopt AlNiCo particles, feCrCo particles, ndFeB particles and Fe 3 O 4 One or more of the particles;
the external magnetic field is a uniform magnetic field, so that magnetic particles in the casting film liquid are magnetized along the same direction;
the direction of the external magnetic field is perpendicular to the surface of the glass plate.
2. The method for preparing a magnetic conductive micro-filtration membrane according to claim 1, wherein the addition amount of ammonium persulfate is 10% of the mass of the mixed solution, and the addition amount of pyrrole is 1% -3% of the mass of the mixed solution.
3. The method for preparing a magnetic conductive micro-filtration membrane according to claim 1, wherein the addition amount of the magnetic particles is 20% -60% of the mass of pyrrole.
4. The method for preparing a magnetic conductive micro-filtration membrane according to claim 1, wherein the percentage of polyvinylpyrrolidone in the mixed solution is 1-wt wt% and the percentage of polyvinylidene fluoride in the mixed solution is 10-wt-20 wt%.
5. Use of a magnetically conductive microfiltration membrane according to claim 1 as MFC anode and MBR filtration membrane in a MFC-MBR coupling system to reduce membrane fouling.
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| KR20110074282A (en) * | 2009-12-24 | 2011-06-30 | 서울대학교산학협력단 | Fabrication of polypyrrole/poly(3,4-ethylenedioxythiophene) magnetic hybrid membrane using vapor deposition polymerization mediated electrospinning and their application as a hybrid filter for the adsorption of heavy metal ions |
| CN102127243A (en) * | 2010-12-31 | 2011-07-20 | 南京大学 | Conductive and antibacterial polytetrafluoroethylene composite thin film and manufacturing method thereof |
| CN104209016A (en) * | 2014-07-30 | 2014-12-17 | 昆明理工大学 | Magnetic electric filtering membrane and preparation method thereof |
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