CN111530305A - Polypyrrole/metal mesh porous filtering membrane with nanocone structure and preparation method and application thereof - Google Patents
Polypyrrole/metal mesh porous filtering membrane with nanocone structure and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a polypyrrole/metal mesh porous filtering membrane with a nanocone structure and a preparation method and application thereof. The method comprises the following steps: (1) performing sand blasting treatment on the surface of the metal filter screen, and preparing a structure with a micro island and micro gullies on the surface of the metal filter screen; (2) depositing a smooth polypyrrole film layer on the surface of the metal mesh by an electrochemical method; (3) and electrochemically depositing polypyrrole with a nano cone structure on the surface of the polypyrrole film layer. The functional composite filter membrane can realize ultra-fast oil-water separation and separate various kinds of sewage, and meanwhile, the functional membrane has good mechanical stability and corrosion resistance and can be used repeatedly.
Description
Technical Field
The invention belongs to the technical field of sewage treatment functional membrane manufacturing, and particularly relates to a polypyrrole/metal mesh porous filtering membrane with a nanocone structure, and a preparation method and application thereof.
Background
In the exploitation and transportation of oil, oil leakage is a common phenomenon. The petroleum leakage can cause serious water pollution and threaten the ecological environment. The method has various methods aiming at the oil stain treatment of the water area, and comprises an oil absorption material adsorption method, a functional membrane separation method, a dispersant degradation method and the like. The functional membrane separation method has the advantages of convenience, rapidness, low cost, environmental protection, low energy consumption and the like, so that the method is concerned by many researchers. Super-hydrophobic/super-hydrophilic materials are widely used as oil-water separation membranes, which can selectively adsorb oil phase/water phase to achieve oil-water separation effect. The research is that magnesium alloy is taken as a substrate, the surface of the magnesium alloy is respectively subjected to pretreatment, low-fluorine activation and ionic solution electrodeposition treatment to prepare an aluminum film, and then a Czochralski method is used for coating the surface of the aluminum film with nano SiO with a super-hydrophobic function2Particles, which require multiple operations to achieve superhydrophobic effect; there are also researchers depositing polymer microspheres on a substrate to obtain a super-hydrophobic separation membrane, but the bonding of the coating to the substrate is not stable enough and is easy to fall off. In addition, some researchers prepare the ABS/ZnO nano composite membrane by an electrostatic spinning technology to be used as a functional membrane for oil-water separation, but the technology is difficult to realize large-area preparation, the preparation cost is high, and the reusability of the material is poor. Meanwhile, the existing technology for preparing the oil-water separation membrane is difficult to further improve the separation rate.
Therefore, based on the preparation difficulty and the use limitation of the current oil-water separation functional membrane, the polypyrrole/metal mesh composite functional membrane with the nano structure is prepared through convenient, controllable and environment-friendly electrochemistry, and the rapid oil-water separation function is realized. The polypyrrole is a conductive polymer with high conductivity, easy synthesis and good environmental stability, and the polypyrrole film can improve the corrosion potential of metal and protect the metal from corrosion. Patent 200710037333.1 discloses a method for preparing a wholly hydrophobic polypyrrole film: glass is used as a substrate, a segmented copolymer film is coated on the surface of the glass, then a polypyrrole thin layer is selectively deposited on the surface of the film, and the polypyrrole is controlled to have hydrophobicity in an oxidation state and a reduction state, so that an oil-water separation function is realized. There are currently few techniques for using polypyrrole to improve filtration membranes for oil-water separation.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention aims to provide a preparation method of a polypyrrole/metal mesh porous filtering membrane with a nanocone structure, wherein a polypyrrole nanocone is grafted on the surface of a metal mesh through sand blasting and an electrochemical method. Firstly, constructing islands with micron structures on the surface of a titanium mesh through sand blasting, then depositing a smooth polypyrrole film layer on the surface of a metal mesh through an electrochemical method, and finally electrochemically depositing polypyrrole with a nanocone structure on the surface of the polypyrrole film layer.
The invention also aims to provide the polypyrrole/metal mesh porous filtering membrane with the nano-cone structure, which is prepared by the method, the functionalized composite filtering membrane can realize ultra-fast oil-water separation and can separate various sewages, such as alkaline sewage, acid-washing sewage, sewage infected by bacteria and the like, and meanwhile, the functional membrane has good mechanical stability and corrosion resistance and can be repeatedly used.
The invention further aims to provide application of the polypyrrole/metal mesh porous filtering membrane with the nano cone structure in oil-water separation.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a polypyrrole/metal mesh porous filtering membrane with a nanocone structure comprises the following steps:
(1) performing sand blasting treatment on the surface of the metal filter screen to enable the metal filter screen to have a micro-island and micro-gully structure, so as to obtain a sand blasting metal filter screen;
(2) selecting a three-electrode mode, taking conductive metal as a counter electrode, taking the sand blasting metal filter screen in the step (1) as a working electrode, taking an electrolyte as a salt solution containing pyrrole, and controlling an electrochemical reaction by adopting a constant voltage method to smoothly deposit polypyrrole on the surface of the sand blasting metal filter screen;
(3) and (3) selecting a three-electrode mode, using conductive metal as a counter electrode, using the sand blasting metal filter screen deposited with smooth polypyrrole in the step (2) as a working electrode, using an electrolyte as a phosphate buffer solution containing pyrrole and naphthalenesulfonic acid, and controlling an electrochemical reaction by adopting a constant current method to deposit the polypyrrole with a nanocone structure on the surface of the smooth polypyrrole to obtain the polypyrrole/metal mesh porous filtering membrane with the nanocone structure.
Preferably, the metal screen in step (1) is one of titanium, copper and stainless steel metal screen.
Preferably, the size of the metal filter screen in the step (1) is 200-400 meshes.
Preferably, before the sand blasting treatment, the metal filter screen in the step (1) needs to be cleaned by deionized water, absolute ethyl alcohol and acetone, and then the oil stain and the oxide layer on the surface of the metal filter screen are removed by acid cleaning.
Preferably, the sand used in the sand blasting treatment in the step (1) is at least one of corundum, silicon carbide and quartz sand; the size of the sand is 60-300 meshes, and more preferably 60-200 meshes; the sand blasting pressure of the sand blasting treatment is 0.3-0.7 MPa, and the sand blasting treatment time is 1-3 minutes.
Preferably, the electrolyte in the step (2) is a hydrochloric acid solution or a potassium chloride solution containing pyrrole, wherein the concentration of chloride ions is 0.1-0.3 mol/L, and more preferably 0.25 mol/L; the concentration of pyrrole in the electrolyte is 0.1-0.3 mol/L, and more preferably 0.2 mol/L.
Preferably, the voltage of the electrochemical reaction in the step (2) is 0.7-1.1V; the time of the electrochemical reaction is 20-120 seconds, and more preferably 20 seconds.
Preferably, the conductive metal in steps (2) and (3) is both platinum electrode and copper electrode.
Preferably, the concentration of pyrrole in the electrolyte in the step (3) is 0.1-0.3 mol/L, more preferably 0.2mol/L, and the concentration of naphthalenesulfonic acid is 0.005-0.02 mol/L, more preferably 0.01 mol/L.
Preferably, the current density of the electrochemical reaction in the step (3) is 2.0-4.0 mA/cm2More preferably 3.6mA/cm2(ii) a The time of the electrochemical reaction is 25-70 minutes, and more preferably 40 minutes.
Preferably, the pH of the phosphate buffer solution containing pyrrole and naphthalenesulfonic acid in step (3) is 6.2-7.2, preferably 6.8.
The polypyrrole/metal mesh porous filtering membrane with the nano cone structure is prepared by the method.
The application of the polypyrrole/metal mesh porous filtering membrane with the nano-cone structure in oil-water separation is provided.
The application the polypyrrole/metal mesh porous filtering membrane with the nano cone structure can realize rapid oil-water separation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) polypyrrole with a nano-cone structure is constructed on a conductive base material by adopting a pollution-free rapid controllable electrochemical method.
(2) The titanium net/smooth polypyrrole/nanocone structure composite filter screen realizes the function of rapid oil-water separation.
(3) The titanium net/smooth polypyrrole/nanocone structure composite filter screen can be reused for many times without pollutant adhesion.
Drawings
FIG. 1 is a schematic diagram of a preparation process of a polypyrrole/metal mesh porous filter membrane with a nanocone structure according to the present application.
FIG. 2 is an electron microscope photograph of the polypyrrole/metal mesh porous filter membrane of the nano-cone structure obtained by the reaction for 30 minutes in example 1, wherein the electron microscope photograph of different observation times is from left to right.
FIG. 3 is a diagram showing a porous filter membrane used for oil-water separation in example 1, which has a reaction time of 30 minutes.
FIG. 4 is a graph showing the relationship between the reaction time and the separation rate in example 1.
Fig. 5 is a microscope picture of the surface of the sample prepared in comparative example 3 on which only smooth-structured polypyrrole was deposited.
FIG. 6 shows the separation efficiency of the membrane used in the oil-water separation experiment in example 4.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Those who do not specify specific conditions in the examples of the present invention follow conventional conditions or conditions recommended by the manufacturer. The raw materials, reagents and the like which are not indicated for manufacturers are all conventional products which can be obtained by commercial purchase.
The sand blasting machine used in the embodiment of the application is purchased from Liangwei Automation equipment Co., Ltd, Guangzhou, and has the model number of 9080 AS-3A.
Example 1
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic, the washed titanium mesh is cleaned and dried, and then the titanium mesh is subjected to sand blasting by a sand blasting machine, wherein the sand blasting air pressure is 0.4MPa, and the processing time is 2 minutes.
Then, a three-electrode mode is selected, a conductive substrate (a titanium mesh subjected to sand blasting) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, the concentration of pyrrole in an electrolyte solution is 0.2mol/L, and the concentration of hydrochloric acid is 0.25 mol/L. And controlling the electrochemical reaction by adopting a constant voltage method, wherein the reaction potential (relative to a reference electrode) is 0.9V, and depositing a layer of compact, uniform and black smooth polypyrrole on the titanium electrode (a sand-blasted titanium mesh) after reacting for 90 seconds. The prepared sample was soaked in deionized water to remove surface unreacted pyrrole and hydrochloric acid.
Finally, a three-electrode model was selected, and the sample prepared above (sandblasted titanium mesh with polypyrrole deposited thereon)) The copper sheet is a working electrode, the copper sheet is a counter electrode, the silver/silver chloride electrode is a reference electrode, the electrolyte solution is phosphate buffer solution (pH is 6.8), and 0.2mol/L pyrrole and 0.01mol/L naphthalenesulfonic acid are dissolved in the solution. The electrochemical reaction is controlled by adopting a constant current method, and the reaction current density is 3.6mA/cm2And after reacting for a certain time (5 minutes, 15 minutes, 30 minutes, 45 minutes and 60 minutes respectively), depositing the polypyrrole with the nano-cone structure on the surface of an electrode (smooth polypyrrole) to obtain the polypyrrole/metal mesh porous filtering membrane with the nano-cone structure.
Figure 2 is a 3-dimensional microscope picture of a titanium mesh/smooth polypyrrole/nanocone structured composite filter mesh membrane (reaction time 30 minutes). As shown in fig. 2, after the titanium mesh is subjected to sand blasting, the surface of the titanium mesh has a micro-island structure, and polypyrrole with a nano-cone structure is prepared on the surface of the micro-island structure. The polypyrrole of the nanocone structure has a top diameter of about 30nm and a length of 300-400 nm.
The composite filter membrane obtained in this example was used to separate a n-hexane/water mixture (n-hexane/water volume ratio 1: 1). The reaction time, the height of the nanocone and the effect of the oil-water separation function in this example are shown in fig. 3-4, and the specific relationship is shown in the following table. The result shows that the oil-water separation can be realized by the filter membrane within the reaction time of 5-60 minutes; as the reaction time increases, the nanocones become longer and the separation rate increases.
TABLE 1 relationship of reaction time, nanopyramid height and separation rate
Example 2
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic, the washed titanium mesh is cleaned and dried, and then the titanium mesh is subjected to sand blasting by a sand blasting machine, wherein the sand blasting air pressure is 0.4MPa, and the processing time is 2 minutes.
Then, a three-electrode mode is selected, a conductive substrate (a titanium mesh subjected to sand blasting) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, the concentration of pyrrole in an electrolyte solution is 0.2mol/L, and the concentration of hydrochloric acid is 0.25 mol/L. And controlling the electrochemical reaction by adopting a constant voltage method, wherein the reaction potential (relative to a reference electrode) is 0.9V, and depositing a layer of compact, uniform and black smooth polypyrrole on the titanium electrode (a sand-blasted titanium mesh) after reacting for 90 seconds. The prepared sample was soaked in deionized water to remove surface unreacted pyrrole and hydrochloric acid.
Finally, a three-electrode mode is selected, the prepared sample (sand blasting titanium mesh deposited with polypyrrole) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, an electrolyte solution is a phosphate buffer solution (pH is 6.8), and 0.2mol/L of pyrrole and 0.01mol/L of naphthalenesulfonic acid are dissolved in the solution. Controlling electrochemical reaction by constant current method, wherein the reaction current is 0.5, 1, 2, 2.5, 3, 4, 5, 8 and 16mA/cm2After 45 minutes of reaction, nanostructured polypyrrole was deposited on the electrode (smooth polypyrrole) surface. The composite filter membrane is used for separating a normal hexane/water mixture (the volume ratio of normal hexane to water is 1: 1).
The reaction current and the time relationship of the oil-water separation efficiency in this example are shown in the following table (√ denotes having oil-water separation, X denotes not having oil-water separation):
TABLE 2 relationship of reaction Current to oil-Water separation function
Example 3
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic, the washed titanium mesh is cleaned and dried, and then the titanium mesh is subjected to sand blasting by a sand blasting machine, wherein the sand blasting air pressure is 0.4MPa, and the processing time is 2 minutes. The sand selection for blasting is given in table 3 below.
Then, a three-electrode mode is selected, a conductive substrate (a titanium mesh subjected to sand blasting) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, and pyrrole is dissolved in an electrolyte solution. And controlling the electrochemical reaction by adopting a constant voltage method, and depositing a layer of compact, uniform and black smooth polypyrrole on the titanium electrode (the titanium mesh subjected to sand blasting) after reacting for 90 seconds. The prepared sample was soaked in deionized water to remove surface unreacted pyrrole and hydrochloric acid. The relevant parameters are shown in table 3 below.
And finally, selecting a three-electrode mode, wherein the prepared sample (the sand blasting titanium mesh deposited with the polypyrrole) is used as a working electrode, the copper sheet is used as a counter electrode, the silver/silver chloride electrode is used as a reference electrode, the electrolyte solution is phosphate buffer solution (the pH value is 6.8), and the pyrrole and the naphthalenesulfonic acid are dissolved in the solution. The electrochemical reaction is controlled by adopting a constant current method, and the reaction current density is 3.6mA/cm2The reaction time is 45 minutes, and the polypyrrole with a nanocone structure is deposited on the surface of the electrode (smooth polypyrrole). The composite filter membrane is used for separating a normal hexane/water mixture (the volume ratio of normal hexane to water is 1: 1).
The relationship between the reaction time, the height of the nanocone, and the oil-water separation function in this example is shown in the following table (v represents oil-water separation, x represents no oil-water separation):
TABLE 3 control of separation Membrane preparation parameters (sand type, thickness, electrolyte type and concentration)
Comparative example 1
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic wave, and the washed titanium mesh is washed and dried for standby application.
Then, a three-electrode mode is selected, a conductive substrate (a cleaned titanium mesh) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, the concentration of pyrrole in an electrolyte solution is 0.2mol/L, and the concentration of hydrochloric acid is 0.25 mol/L. The electrochemical reaction was controlled using a constant voltage method with a reaction potential (relative to the reference electrode) of 0.9V, and the titanium electrode (titanium mesh) was not coated with polypyrrole after 90 seconds of reaction. In the reaction process, a large amount of bubbles are generated on the surface of the titanium mesh, and oxygen precipitation reaction is possible to occur. Thus, the grit blasting process is critical for uniform and smooth polypyrrole coating deposition.
Finally, a three-electrode mode is selected, the prepared sample (the titanium mesh without sand blasting treatment for successfully depositing pyrrole) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, an electrolyte solution is a phosphate buffer solution (the pH value is 6.8), and pyrrole and naphthalenesulfonic acid are dissolved in the solution. The electrochemical reaction is controlled by adopting a constant current method, and the reaction current density is 3.6mA/cm2The reaction time was 45 minutes. After the reaction is finished, the color of the titanium mesh is not changed, and no black polypyrrole is generated. In an oil-water separation experiment, the composite filter membrane cannot separate an oil-water mixture (the volume ratio of normal hexane to water is 1:1), and oil and water smoothly pass through the filter membrane. Therefore, the sand blasting process is very important for preparing the oil-water separation filter membrane.
Comparative example 2
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic, the washed titanium mesh is cleaned and dried, and then a sand blasting machine is used for carrying out sand blasting treatment on the titanium mesh, wherein the sand blasting air pressure is 0.4MPa, and the treatment time is 2 minutes.
Then, a three-electrode mode is selected, the prepared sample (the titanium mesh subjected to sand blasting) is used as a working electrode, the copper sheet is used as a counter electrode, and the silver is usedThe silver chloride electrode is a reference electrode, the electrolyte solution is phosphate buffer solution (pH is 6.8), and 0.2mol/L pyrrole and 0.01mol/L naphthalenesulfonic acid are dissolved in the solution. Controlling electrochemical reaction by constant current method, wherein the reaction current is 3mA/cm2After 60 minutes of reaction, the titanium mesh surface had no black polypyrrole deposition. During the reaction process, a small amount of bubbles are generated on the surface of the titanium mesh. In an oil-water separation experiment, the composite filter membrane cannot separate an oil-water mixture (the volume ratio of n-hexane to water is 1: 1). Therefore, the construction process of smooth polypyrrole is very important for the deposition of the polypyrrole with the nano cone structure.
Comparative example 3
Firstly, a titanium mesh (320 meshes) of 3cm multiplied by 3cm is respectively washed with deionized water, 99.7 percent of absolute ethyl alcohol and 99.5 percent of acetone for 20 minutes, the titanium mesh is washed with hydrofluoric acid/nitric acid mixed solution (the volume ratio of water to hydrofluoric acid to nitric acid is 1:1:100) for 30 minutes by ultrasonic, the washed titanium mesh is cleaned and dried, and then the titanium mesh is subjected to sand blasting by a sand blasting machine, wherein the sand blasting air pressure is 0.4MPa, and the processing time is 2 minutes.
Then, a three-electrode mode is selected, a conductive substrate (a titanium mesh subjected to sand blasting) is used as a working electrode, a copper sheet is used as a counter electrode, a silver/silver chloride electrode is used as a reference electrode, the concentration of pyrrole in an electrolyte solution is 0.2mol/L, and the concentration of hydrochloric acid is 0.25 mol/L. And controlling the electrochemical reaction by adopting a constant voltage method, wherein the reaction potential (relative to a reference electrode) is 0.9V, and depositing a layer of compact, uniform and black smooth polypyrrole on the titanium electrode (a sand-blasted titanium mesh) after reacting for 90 seconds. The prepared sample was soaked in deionized water to remove surface unreacted pyrrole and hydrochloric acid. The surface topography of the filter is shown in FIG. 5, the surface being relatively smooth. The filter membrane is used for oil-water separation experiments (n-hexane/water volume ratio is 1:1), and oil/water mixtures can pass through the filter membrane. Therefore, the filter membrane without polypyrrole with a nanocone structure does not have an oil-water separation function.
Example 4
The oil-water separation experiment was performed a plurality of times on the sample of example 1 in which the reaction time was 30 minutes. After the oil-water separation experiment, the oil part is blocked in the container on the membrane, water smoothly passes through the filtering membrane, then the oil on the filtering membrane is poured out, the oil-water separation experiment is carried out, and after the experiment is repeated for 50 times, the oil-water separation function of the filtering membrane is unchanged. The ratio of the weight of the water after separation to the weight of the water before separation was calculated as the separation efficiency, and the separation efficiency of 50 times of separation is shown in fig. 6. The result shows that after 50 times of oil-water separation experiments, the separation efficiency of the filter membrane is still kept above 95%, which indicates that the filter membrane can be repeatedly used.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of a polypyrrole/metal mesh porous filtering membrane with a nanocone structure is characterized by comprising the following steps:
(1) performing sand blasting treatment on the surface of the metal filter screen to enable the metal filter screen to have a micro-island and micro-gully structure, so as to obtain a sand blasting metal filter screen;
(2) selecting a three-electrode mode, taking conductive metal as a counter electrode, taking the sand blasting metal filter screen in the step (1) as a working electrode, taking an electrolyte as a salt solution containing pyrrole, and controlling an electrochemical reaction by adopting a constant voltage method to smoothly deposit polypyrrole on the surface of the sand blasting metal filter screen;
(3) and (3) selecting a three-electrode mode, using conductive metal as a counter electrode, using the sand blasting metal filter screen deposited with smooth polypyrrole in the step (2) as a working electrode, using an electrolyte as a phosphate buffer solution containing pyrrole and naphthalenesulfonic acid, and controlling an electrochemical reaction by adopting a constant current method to deposit the polypyrrole with a nanocone structure on the surface of the smooth polypyrrole to obtain the polypyrrole/metal mesh porous filtering membrane with the nanocone structure.
2. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to claim 1, wherein the current density of the electrochemical reaction in the step (3) is 2.0-4.0 mA/cm2The time of the electrochemical reaction is 25 toFor 70 minutes.
3. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to claim 1, wherein the concentration of pyrrole in the electrolyte in the step (3) is 0.1-0.3 mol/L, and the concentration of naphthalene sulfonic acid is 0.005-0.02 mol/L.
4. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to claim 1, wherein the electrolyte in step (2) is a hydrochloric acid solution or a potassium chloride solution containing pyrrole, wherein the concentration of chloride ions is 0.1-0.3 mol/L, and the concentration of pyrrole in the electrolyte is 0.1-0.3 mol/L.
5. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to claim 1, wherein the voltage of the electrochemical reaction in the step (2) is 0.7-1.1V; the time of the electrochemical reaction is 20-120 seconds.
6. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to any one of claims 1 to 5, characterized in that the sand used in the sand blasting treatment in the step (1) is at least one of corundum, silicon carbide and quartz sand; the size of the sand is 60-300 meshes; the sand blasting pressure of the sand blasting treatment is 0.3-0.7 MPa, and the sand blasting treatment time is 1-3 minutes.
7. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to any one of claims 1 to 5, wherein the metal filtering mesh in step (1) is one of titanium, copper and stainless steel metal filtering meshes; the size of the metal filter screen is 200-400 meshes; and (3) the conductive metal in the steps (2) and (3) is a platinum electrode and a copper electrode.
8. The preparation method of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure according to any one of claims 1 to 5, wherein the pH of the phosphate buffer solution containing pyrrole and naphthalenesulfonic acid in step (3) is 6.2 to 7.2.
9. A polypyrrole/metal mesh porous filtering membrane with a nano cone structure prepared by the method of any one of claims 1 to 8.
10. The application of the polypyrrole/metal mesh porous filtering membrane with the nanocone structure in the oil-water separation in the claim 9.
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| CN113307969A (en) * | 2021-02-05 | 2021-08-27 | 北京航空航天大学 | Conductive polymer porous membrane and preparation method thereof |
| CN114197114A (en) * | 2021-12-01 | 2022-03-18 | 同济大学 | Super-hydrophilic conductive nanofiber membrane and method for treating emulsion by using same |
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| CN114197114A (en) * | 2021-12-01 | 2022-03-18 | 同济大学 | Super-hydrophilic conductive nanofiber membrane and method for treating emulsion by using same |
| CN114197114B (en) * | 2021-12-01 | 2023-05-12 | 同济大学 | Super-hydrophilic conductive nanofiber membrane and emulsion treatment method thereof |
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