CN113171691A - Super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane and preparation method and application thereof - Google Patents
Super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane and preparation method and application thereof Download PDFInfo
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- 239000002033 PVDF binder Substances 0.000 title claims abstract description 69
- 239000012528 membrane Substances 0.000 title claims abstract description 69
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 238000000967 suction filtration Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000007865 diluting Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000010865 sewage Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 229920002873 Polyethylenimine Polymers 0.000 description 54
- 238000000926 separation method Methods 0.000 description 24
- 239000000047 product Substances 0.000 description 21
- 239000000243 solution Substances 0.000 description 15
- 239000000725 suspension Substances 0.000 description 10
- 239000012466 permeate Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000003760 magnetic stirring Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000001612 separation test Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 4
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 4
- 229920000053 polysorbate 80 Polymers 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- JVSWJIKNEAIKJW-UHFFFAOYSA-N dimethyl-hexane Natural products CCCCCC(C)C JVSWJIKNEAIKJW-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
-
- 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
- B01D67/0002—Organic membrane manufacture
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
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Abstract
The invention belongs to the technical field of high polymer materials, and discloses a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane and a preparation method and application thereof. The reaction system of the invention does not relate to any organic solvent, is green and environment-friendly, is simple to operate, has wide market application prospect, and is worthy of great popularization.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane, and a preparation method and application thereof.
Background
Water is the source of life and the foundation on which human beings rely for survival; however, the problem of water pollution is serious at present, and oily sewage occupies a large proportion. The oily sewage has great harm to the living environment and ecological balance, the treatment of the oily sewage is an important subject of scientific research, the source is wide, the quantity is large, the harm to the environment is large, a large amount of oily sewage generated in industrial production is effectively separated, the purposes of recycling and standard discharge are achieved, and the method has great significance for environmental protection and water resource saving.
Oil generally exists in water in four forms: free oil, dispersed oil, emulsified oil and dissolved oil. Because the free oil and the water phase have obvious interlayer interfaces, the separation of the free oil and the water phase is the easiest, the particle size of the dispersed oil is 100-10 mu m, and the dispersed oil is easy to aggregate and layer, so the separation is easier. The size of the emulsified oil is less than 10 μm, the separation difficulty is high, the influence on the environment is not negligible, and the emulsified oil can be discharged after being treated. In the prior art, a super-hydrophilic/underwater super-oleophobic membrane material is a common method for separating emulsified oil and water, but the preparation method is complex, the separation efficiency is not high, and the system generally needs an organic solvent and is not environment-friendly.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane, and a preparation method and application thereof.
In order to overcome the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving PEI and PA in water, and then mixing, stirring and ultrasonically treating to obtain a mixed solution;
b) diluting the mixed solution obtained in the step a) by 10-100 times, performing suction filtration under a vacuum condition, and drying to obtain the super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane;
wherein, PA is phytic acid, and PEI is polyethyleneimine.
As a further improvement of the scheme, the mass ratio of the PEI to the water is 1 (10-50).
As a further improvement of the scheme, the mass ratio of the PA to the water is 1 (10-50).
As a further improvement of the scheme, the mass ratio of the PEI to the PA is (1-81): 9.
As a further improvement of the proposal, the pressure in the step b) during the suction filtration is-0.01 to-0.09 MPa.
As a further improvement of the scheme, the drying temperature in the step b) is 40-60 ℃.
As a further improvement of the scheme, the drying time is 30-60 min.
A super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane is prepared according to the preparation method.
The super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane is applied to the treatment of emulsified oily sewage.
The invention has the beneficial effects that: the invention provides a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane and a preparation method and application thereof. The reaction system of the invention does not relate to any organic solvent, is green and environment-friendly, is simple to operate, has wide market application prospect, and is worthy of great popularization.
Drawings
In FIG. 1, (a), (b) are SEM images of the original unmodified PVDF film, (c) and (d) are SEM images of the finished PVDF film product 1 modified by PA @ PEI in example 1;
FIG. 2 is an infrared spectrum of an unmodified virgin PVDF film and the finished PA @ PEI modified PVDF film 1 obtained in example 1, wherein a is the unmodified virgin PVDF film and b is the finished PA @ PEI modified PVDF film 1 obtained in example 1;
in FIG. 3, (a) is a graph of water contact angle in air and water under water oil contact angle for an unmodified original PVDF film, (b) is a graph of water contact angle in air and water under water oil contact angle for finished product 1 of PA @ PEI modified PVDF film;
in FIG. 4, (a) is a polarization microscope photograph before the separation of the emulsified oil-in-water, and (b) is a polarization microscope photograph after the separation of the emulsified oil-in-water using the PA @ PEI modified PVDF film finished product 1 prepared in example 1; (c) the particle size distribution diagram before and after the separation of the emulsified oil-in-water is shown.
Detailed Description
The present invention is specifically described below with reference to examples in order to facilitate understanding of the present invention by those skilled in the art. It should be particularly noted that the examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, as non-essential improvements and modifications to the invention may occur to those skilled in the art, which fall within the scope of the invention as defined by the appended claims. Meanwhile, the raw materials mentioned below are not specified in detail and are all commercially available products; the process steps or extraction methods not mentioned in detail are all process steps or extraction methods known to the person skilled in the art.
Example 1
A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving 0.1g of PEI and 0.1g of PA in 50mL of water, mixing the two solutions to form a suspension, and strongly stirring and ultrasonically treating the suspension uniformly;
b) diluting the solution by 10 times, performing suction filtration by using a sand core funnel, enabling the solution to be loaded on a PVDF membrane under the pressure of-0.09 MPa during suction filtration, and performing drying treatment at 60 ℃ for 45min to obtain a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane finished product 1, which is referred to as PA @ PEI modified PVDF membrane finished product 1 for short.
In fig. 1, (a), (b) are sem images of the original PVDF film without modification, (c) and (d) are sem images of the finished product 1 of the PA @ PEI modified PVDF film, and it can be seen from fig. 1 that the modified PVDF film is covered with a uniform coating layer and still maintains the interconnected pore size.
FIG. 2 is an infrared spectrum of an unmodified original PVDF film and a finished PA @ PEI modified PVDF film 1 obtained in example 1, wherein a is the unmodified original PVDF film and b is the finished PA @ PEI modified PVDF film 1 obtained in example 1, and it can be seen from FIG. 2 that the finished PA @ PEI modified PVDF film 1 is 965cm-1Po belonging to PA3 2-， 1468cm-1Is assigned to the-CN peak in PEI, 1547cm-1Is assigned to-NH, 1103Ccm in PEI-1The peak of the bonding group between the phosphorus hydroxyl and the amino is shown, and the PA and the PEI form a micelle and are successfully attached to the PVDF membrane.
FIG. 3 is a graph of water contact angle in air and oil contact angle under water of an unmodified original PVDF membrane and a PA @ PEI modified PVDF membrane finished product 1, and it can be seen from FIG. 3 that the water contact angle in air of the original PVDF membrane is 126 degrees, and oil can gradually permeate into the membrane under water; the modified PVDF membrane can gradually spread in water in the air, the contact angle is 0 degrees, the underwater oil contact angle is 156 degrees, and the result proves that the hydrophobic and oleophilic PVDF membrane is successfully modified into the super-hydrophilic/underwater super-oleophobic PVDF membrane.
Carrying out oil-water separation test on the PA @ PEI modified PVDF membrane finished product 1: taking 0.2g of Tween 80 in a beaker, adding 100mL of water and 1mL of diesel oil, adding a magnetic stirring rotor, and continuously stirring for 4 hours to prepare milky stable emulsified oil-in-water. Fixing the prepared membrane between two glass tubes, pouring emulsified oil-in-water into the membrane, enabling water in the emulsified oil-in-water to permeate through the PA @ PEI modified PVDF membrane, collecting the emulsified oil-in-water through a lower beaker, intercepting emulsified oil drops above the membrane, and performing suction filtration at negative pressure in the separation process, wherein the pressure is-0.02 MPa.
As shown in FIG. 4, it can be seen from (a) and (c) that before separation, the emulsified oil-in-water under the polarizing microscope is covered with emulsified oil droplets, and the particle size distribution measured by the particle size analyzer is 200-3500nm, and from (b) and (c), after separation, the emulsified oil droplets are not present under the polarizing microscope, and the particle size distribution of the emulsified oil-in-water is 0-200 nm. The purity of the water before separation measured by a total organic carbon analyzer was 98.0%, and the purity of the oil after separation reached 99.9%.
Example 2
A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving 0.05g of PEI and 0.1g of PA in 50mL of water, mixing the two solutions to form a suspension, and strongly stirring and ultrasonically treating the suspension uniformly;
b) and diluting the solution by 20 times, performing suction filtration by using a sand core funnel, wherein the pressure during suction filtration is-0.09 MPa, loading the solution on a PVDF membrane, and drying at 60 ℃ for 45min to obtain a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane finished product 2, namely a PA PEI @ modified PVDF membrane finished product 2.
Carrying out oil-water separation test on the PA @ PEI modified PVDF membrane finished product 2: taking 0.2g of Tween 80 in a beaker, adding 100mL of water and 1mL of isooctane, adding a magnetic stirring rotor, and continuously stirring for 4h to prepare milky stable emulsified oil-in-water. Fixing the prepared membrane between two glass tubes, pouring emulsified oil-in-water into the membrane, enabling water in the emulsified oil-in-water to permeate through the PA @ PEI modified PVDF membrane, collecting the emulsified oil-in-water through a lower beaker, retaining emulsified oil drops above the membrane, and performing suction filtration at negative pressure in the separation process, wherein the pressure is-0.04 MPa. The purity of the water before separation measured by a total organic carbon analyzer was 98.1%, and the purity of the oil after separation reached 99.8%.
Example 3
A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving 0.01g of PEI and 0.1g of PA in 50mL of water, mixing the two solutions to form a suspension, and strongly stirring and ultrasonically treating the suspension uniformly;
b) and diluting the solution by 30 times, performing suction filtration by using a sand core funnel, wherein the pressure during suction filtration is-0.09 MPa, loading the solution on a PVDF membrane, and drying at 60 ℃ for 45min to obtain a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane finished product 3, namely a PA PEI @ modified PVDF membrane finished product 3.
Carrying out oil-water separation test on the PA @ PEI modified PVDF membrane finished product 3: taking 0.2g of Tween 80 in a beaker, adding 100mL of water and 1mL of gasoline, adding a magnetic stirring rotor, and continuously stirring for 4h to prepare milky stable emulsified oil-in-water. Fixing the prepared membrane between two glass tubes, pouring emulsified oil-in-water into the membrane, enabling water in the emulsified oil-in-water to permeate through the PA @ PEI modified PVDF membrane, collecting the emulsified oil-in-water through a lower beaker, retaining emulsified oil drops above the membrane, and performing suction filtration at negative pressure in the separation process, wherein the pressure is-0.05 MPa. The purity of the water before separation measured by a total organic carbon analyzer was 98.2%, and the purity of the oil after separation reached 99.9%.
Example 4
A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving 0.15g of PEI and 0.1g of PA in 50mL of water, mixing the two solutions to form a suspension, and strongly stirring and ultrasonically treating the suspension uniformly;
b) and diluting the solution by 50 times, performing suction filtration by using a sand core funnel, wherein the pressure during suction filtration is-0.09 MPa, loading the solution on a PVDF membrane, and drying at 60 ℃ for 45min to obtain a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane finished product 4, namely a PA PEI @ modified PVDF membrane finished product 4.
Carrying out oil-water separation test on the PA @ PEI modified PVDF membrane finished product 4: 0.2g of Tween 80 is taken in a beaker, 100mL of water and 1mL of kerosene are added, a magnetic stirring rotor is added, and stirring is continuously carried out for 4 hours to prepare milky stable emulsified oil-in-water. Fixing the prepared membrane between two glass tubes, pouring emulsified oil-in-water into the membrane, enabling water in the emulsified oil-in-water to permeate through the PA @ PEI modified PVDF membrane, collecting the emulsified oil-in-water through a lower beaker, retaining emulsified oil drops above the membrane, and performing suction filtration at negative pressure in the separation process, wherein the pressure is-0.07 MPa. The purity of the water before separation measured by a total organic carbon analyzer was 98.3%, and the purity of the oil after separation reached 99.2%.
Example 5
A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane comprises the following steps:
a) respectively dissolving 0.2g of PEI and 0.1g of PA in 50mL of water, mixing the two solutions to form a suspension, and strongly stirring and ultrasonically treating the suspension uniformly;
b) and diluting the solution by 80 times, performing suction filtration by using a sand core funnel, wherein the pressure during suction filtration is-0.09 MPa, loading the solution on a PVDF membrane, and drying at 60 ℃ for 45min to obtain a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane finished product 5, namely the PA @ PEI modified PVDF membrane finished product 5.
Carrying out oil-water separation test on the PA @ PEI modified PVDF membrane finished product 5: a milky stable emulsified oil-in-water emulsion was prepared by placing 0.2g of span80 in a beaker, adding 100mL of water and 1mL of toluene, adding to a magnetic stirring rotor, and stirring continuously for 4 h. Fixing the prepared membrane between two glass tubes, pouring emulsified oil-in-water into the membrane, enabling water in the emulsified oil-in-water to permeate through the PA @ PEI modified PVDF membrane, collecting the emulsified oil-in-water through a lower beaker, retaining emulsified oil drops above the membrane, and performing suction filtration at negative pressure in the separation process, wherein the pressure is-0.09 MPa. The purity of the water before separation measured by total organic carbon analyzer was 98.6%, and the purity of the oil after separation reached 99.7%.
It will be obvious to those skilled in the art that many simple derivations or substitutions can be made without inventive effort without departing from the inventive concept. Therefore, simple modifications to the present invention by those skilled in the art according to the present disclosure should be within the scope of the present invention. The above embodiments are preferred embodiments of the present invention, and all similar processes and equivalent variations to those of the present invention should fall within the scope of the present invention.
Claims (9)
1. A preparation method of a super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane is characterized by comprising the following steps:
a) respectively dissolving PEI and PA in water, and then mixing, stirring and ultrasonically treating to obtain a mixed solution;
b) diluting the mixed solution obtained in the step a) by 10-100 times, performing suction filtration under a negative pressure condition, and drying to obtain the super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane.
2. The method according to claim 1, wherein the mass ratio of PEI to water in step a) is 1 (10-50).
3. The preparation method according to claim 1, wherein the mass ratio of PA to water in step a) is 1 (10-50).
4. The method according to claim 1, wherein the mass ratio of PEI to PA in step a) is (1-81): 9.
5. The method according to claim 1, wherein the pressure at the time of suction filtration in step b) is from-0.01 to-0.09 MPa.
6. The method according to claim 1, wherein the drying temperature in step b) is 40 to 60 ℃.
7. The method according to claim 1, wherein the drying time in step b) is 30 to 60 min.
8. A super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane, characterized by being prepared according to the preparation method of any of claims 1-7.
9. The application of the super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane is characterized in that the super-hydrophilic/underwater super-oleophobic PA @ PEI modified PVDF membrane disclosed in claim 8 is applied to the treatment of emulsified oily sewage.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600152A (en) * | 2021-08-27 | 2021-11-05 | 佛山科学技术学院 | Hydrophilic-hydrophobic asymmetric three-dimensional material and preparation method and application thereof |
| CN114377435A (en) * | 2022-01-18 | 2022-04-22 | 中国石油大学(华东) | Preparation method of super-durable oil-water separation net |
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| US20130309450A1 (en) * | 2012-05-11 | 2013-11-21 | Michelle Khine | Superhydrophobic surfaces |
| CN103599708A (en) * | 2013-11-30 | 2014-02-26 | 大连欧科膜技术工程有限公司 | Composite membrane and preparation method thereof |
| CN109385173A (en) * | 2017-08-10 | 2019-02-26 | 中国科学院苏州纳米技术与纳米仿生研究所 | Oleophobic coating material, oil-water separating function material, preparation method and the usage |
| CN110314829A (en) * | 2019-07-08 | 2019-10-11 | 河北大学 | It is a kind of that oneself puts out a fire, the preparation method of super hydrophilic, underwater super oleophobic coating |
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2020
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| CN113600152A (en) * | 2021-08-27 | 2021-11-05 | 佛山科学技术学院 | Hydrophilic-hydrophobic asymmetric three-dimensional material and preparation method and application thereof |
| CN113600152B (en) * | 2021-08-27 | 2023-10-31 | 佛山科学技术学院 | Hydrophilic-hydrophobic asymmetric three-dimensional material and preparation method and application thereof |
| CN114377435A (en) * | 2022-01-18 | 2022-04-22 | 中国石油大学(华东) | Preparation method of super-durable oil-water separation net |
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