CN112774468A - Graphene polysulfone ultrafiltration membrane and preparation method thereof - Google Patents
Graphene polysulfone ultrafiltration membrane and preparation method thereof Download PDFInfo
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- CN112774468A CN112774468A CN202011505549.8A CN202011505549A CN112774468A CN 112774468 A CN112774468 A CN 112774468A CN 202011505549 A CN202011505549 A CN 202011505549A CN 112774468 A CN112774468 A CN 112774468A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 135
- 239000012528 membrane Substances 0.000 title claims abstract description 134
- 229920002492 poly(sulfone) Polymers 0.000 title claims abstract description 104
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 90
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 66
- 239000000654 additive Substances 0.000 claims abstract description 61
- 230000000996 additive effect Effects 0.000 claims abstract description 61
- 238000005266 casting Methods 0.000 claims abstract description 39
- 239000000243 solution Substances 0.000 claims abstract description 39
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000003960 organic solvent Substances 0.000 claims abstract description 25
- 238000009987 spinning Methods 0.000 claims abstract description 23
- 239000002033 PVDF binder Substances 0.000 claims abstract description 21
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 21
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 20
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 20
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 20
- 239000011259 mixed solution Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims description 18
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 15
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 12
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 10
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 8
- OHLUUHNLEMFGTQ-UHFFFAOYSA-N N-methylacetamide Chemical compound CNC(C)=O OHLUUHNLEMFGTQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 6
- 235000011009 potassium phosphates Nutrition 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 6
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 5
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 2
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 6
- 210000004379 membrane Anatomy 0.000 description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 125000002795 guanidino group Chemical group C(N)(=N)N* 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000007112 amidation reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 239000004941 mixed matrix membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- GPAPPPVRLPGFEQ-UHFFFAOYSA-N 4,4'-dichlorodiphenyl sulfone Chemical compound C1=CC(Cl)=CC=C1S(=O)(=O)C1=CC=C(Cl)C=C1 GPAPPPVRLPGFEQ-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004954 Polyphthalamide Substances 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- QSCPQKVWSNUJLJ-UHFFFAOYSA-N [amino(methoxy)methylidene]azanium;sulfate Chemical compound COC(N)=N.COC(N)=N.OS(O)(=O)=O QSCPQKVWSNUJLJ-UHFFFAOYSA-N 0.000 description 1
- 150000001263 acyl chlorides Chemical class 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000845 anti-microbial effect Effects 0.000 description 1
- 210000002469 basement membrane Anatomy 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000614 phase inversion technique Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920006375 polyphtalamide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Classifications
-
- 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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
-
- 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
- B01D61/145—Ultrafiltration
-
- 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
-
- 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
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- 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
- B01D71/02—Inorganic material
- B01D71/021—Carbon
-
- 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
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/44—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of groups B01D71/26-B01D71/42
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/48—Antimicrobial properties
Abstract
The invention discloses a graphene polysulfone ultrafiltration membrane and a preparation method thereof, wherein the method comprises the following steps: step 1, preparing graphene powder; step 2, dissolving graphene powder in an organic solvent, and uniformly stirring; step 3, adding polysulfone, polyvinylidene fluoride and polyvinylpyrrolidone into a stirring kettle, and heating and preserving heat; step 4, adding a first additive and a first auxiliary agent, and continuously stirring; step 5, adding a second additive and a second auxiliary agent, and continuously stirring; step 6, pouring the graphene mixed solution into a reaction kettle, preserving heat and continuously stirring to obtain a primary membrane casting solution; step 7, carrying out vacuum defoaming on the primary membrane casting solution; and 8, turning on an air compressor, switching on a power supply, and using spinning equipment to prepare the graphene polysulfone ultrafiltration membrane. The invention also provides the graphene polysulfone ultrafiltration membrane prepared by the method. According to the invention, the graphene is added into the polysulfone ultrafiltration membrane, so that the antibacterial performance, tensile strength, compressive strength and other mechanical performance strengths of the polysulfone ultrafiltration membrane can be improved.
Description
Technical Field
The invention relates to an ultrafiltration membrane and a preparation method thereof, in particular to a graphene polysulfone ultrafiltration membrane and a preparation method thereof.
Background
Graphene (Graphene) is a polymer made of carbon atoms in sp2The hybrid tracks form a hexagonal honeycomb lattice two-dimensional carbon nanomaterial. The graphene has excellent optical, electrical and mechanical properties, has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like, and is considered to be a revolutionary material in the future.
The ultrafiltration membrane is widely applied to industrial pure water treatment and wastewater treatment, and the operation of the industrial ultrafiltration membrane is generally divided into internal pressure and external pressure.
The household ultrafiltration membrane (hollow fiber membrane) separation technology is one of the six high and new technologies in the twenty-first century, has become a standard of separation process by the remarkable characteristics of operation at normal temperature and low pressure, no phase change, low energy consumption and the like, and is widely used in developed countries and regions in Europe and America and the like. Ultrafiltration membranes have been widely used in many fields such as drinking mineral water purification, beverage food, medical medicine, etc.
The dissolved substances and substances having a smaller pore diameter than the membrane permeate the ultrafiltration membrane as a permeate, and the substances that do not permeate the membrane are gradually concentrated in the effluent. The produced water (permeate) will thus contain water, ions, and small molecular weight species, while colloidal species, large molecular species, particles, bacteria, viruses, protozoa, etc. will be trapped by the membrane and removed by concentrated water discharge, backwash and chemical cleaning.
The aperture range of the industrial ultrafiltration membrane is about 0.01-0.1 um, and the industrial ultrafiltration membrane has a good effect of removing pollutants such as particulate matters, bacteria, viruses, colloids and macromolecular organic matters in a water body. Glass transition temperature: above this temperature, the high polymer exhibits elasticity; below this temperature, the high polymer exhibits brittleness, and must be considered for use as plastics, rubbers, synthetic fibers, and the like. The ultrafiltration membrane has good mechanical strength and can bear higher water pressure and impact resistance. The main materials applied to the ultrafiltration membrane comprise polyvinylidene fluoride, polyphthalamide, polyether sulfone, polysulfone and other polymer resin materials.
The patent "a preparation method of a small intercepted molecular weight polysulfone ultrafiltration membrane" discloses a preparation method of a small intercepted molecular weight polysulfone ultrafiltration membrane, 1) polysulfone and an additive are dissolved into a solvent to obtain a membrane casting solution; 2) carrying out vacuum defoaming on the membrane casting solution, and preparing a polysulfone ultrafiltration membrane basement membrane on industrial equipment; 3) preparing a polyvinyl alcohol (PVA) aqueous solution; 4) adding a certain amount of concentrated sulfuric acid into a PVA aqueous solution, coating the PVA aqueous solution on the surface of the prepared ultrafiltration membrane, and then putting the ultrafiltration membrane into an oven for reaction; 5) and soaking the ultrafiltration membrane after reaction in pure water for cleaning to obtain the required ultrafiltration membrane. The invention prepares the composite membrane by reacting the surface of the polysulfone basal membrane with PVA, and adjusts the surface cortex and micropores of the membrane by changing the reaction conditions in the membrane preparation engineering to obtain the polysulfone ultrafiltration membrane with different molecular weight cut-off.
The patent 'a preparation method of double-layer polysulfone hollow fiber ultrafiltration membrane' provides a preparation method of polysulfone ultrafiltration membrane, which comprises the steps of dividing the traditional ultrafiltration layer into one layer and two layers, wherein the ultrafiltration layer comprises a high-selectivity layer and a high-flux layer, the two layers of structures both adopt inorganic materials which react with acid as pore-forming materials, in the post-treatment process, the pore-forming materials are removed to form a pure polysulfone ultrafiltration membrane, and the application safety of the product in the fields of drinking water and ultrapure water is also ensured on the basis of ensuring the binding force between the two layers of structures. Therefore, compared with the traditional ultrafiltration layer, under the condition of consistent film thickness, the existence of the high-flux layer enables the flux of the ultrafiltration layer to be improved, and the existence of the high-selectivity layer ensures that the selectivity cannot be reduced. The method has high application potential in the aspects of wastewater treatment, drinking water purification and ultrapure water preparation.
Patent CN201910575424.3 entitled guanidino functionalized graphene oxide/polysulfone ultrafiltration membrane and preparation method thereof discloses a guanidino functionalized graphene oxide/polysulfone ultrafiltration membrane and preparation method thereof. The preparation method of the mixed matrix membrane blended by the guanidino functionalized graphene oxide/polysulfone comprises the steps of firstly carrying out amidation reaction by taking carboxyl on a graphene oxide lamella as a modification site, then reacting acyl chloride on graphene with amino on 1, 6-hexamethylene diamine by using amidation reaction to obtain amino functionalized graphene oxide, carrying out nucleophilic substitution reaction on amino on the amino functionalized graphene oxide and methoxy on O-methylisourea hemisulfate to generate the guanidino functionalized graphene oxide, and preparing the guanidino functionalized graphene oxide/polysulfone mixed matrix membrane by a non-solvent induced phase inversion method. The guanidino functionalized graphene oxide/polysulfone ultrafiltration membrane prepared by the method disclosed by the invention can improve the pure water flux of the membrane, improve the separation performance and the anti-pollution performance, has higher antibacterial rate on escherichia coli and staphylococcus aureus, and has excellent antimicrobial performance.
Disclosure of Invention
The invention aims to provide an ultrafiltration membrane and a preparation method thereof, wherein graphene is added into a polysulfone ultrafiltration membrane to improve the antibacterial property and the tensile and compressive strength of the polysulfone ultrafiltration membrane and other mechanical properties.
In order to achieve the above object, the present invention provides a method for preparing a graphene polysulfone ultrafiltration membrane, wherein the method comprises: step 1, preparing graphene powder; step 2, dissolving graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution; step 3, adding polysulfone, polyvinylidene fluoride and polyvinylpyrrolidone into a stirring kettle, heating, preserving heat and stirring uniformly; step 4, sequentially adding a first additive and a first auxiliary agent into the reaction kettle, and continuously stirring; step 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring; step 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat and continuously stirring to prepare a primary membrane casting solution; step 7, performing vacuum defoaming on the primary membrane casting solution to prepare a graphene polysulfone membrane casting solution; and 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane.
In the step 2, the weight ratio of the graphene powder to the organic solvent is (2-4) - (6-8), and the organic solvent contains acetone and/or butanone.
In the step 3, the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone are added into a stirring kettle, heated for 1-4 hours, kept at the temperature of 100-150 ℃ and uniformly stirred.
In the preparation method of the graphene polysulfone ultrafiltration membrane, in the step 4, the stirring time is 10-30 minutes.
In the preparation method of the graphene polysulfone ultrafiltration membrane, in the step 5, the stirring time is 30-50 minutes.
In the preparation method of the graphene polysulfone ultrafiltration membrane, in the step 6, the heat preservation and the continuous stirring are carried out for 2-3 hours.
In the step 7, the primary membrane casting solution is subjected to vacuum defoaming under the conditions of maintaining the pressure of 1-5MPA and the temperature of 80-180 ℃.
The invention also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% -60% of polysulfone, 10% -15% of polyvinylidene fluoride, 5% -10% of polyvinylpyrrolidone, 1% -5% of graphene, 10% -15% of a first additive, 10% -15% of a second additive, 1% -5% of a first auxiliary agent and 1% -5% of a second auxiliary agent.
The graphene polysulfone ultrafiltration membrane, wherein the first additive comprises N-methylacetamide and the second additive comprises N-methylpyrrolidone; the first auxiliary agent comprises any one or more of sodium chloride, zinc oxide and magnesium sulfate; the second auxiliary agent comprises any one or more of n-heptane, polyethylene glycol and potassium phosphate.
The graphene polysulfone ultrafiltration membrane and the preparation method thereof provided by the invention have the following advantages:
the polysulfone ultrafiltration membrane adopted by the invention is a plastic film prepared by condensing bisphenol and 4, 4' -dichlorodiphenyl sulfone, and has the characteristics of good chemical stability, thermal stability and mechanical property. After the polysulfone ultrafiltration membrane is combined with the graphene, the composite membrane has the advantages of strong rigidity, high strength, creep resistance, stable size, heat resistance, acid and alkali resistance, good chlorine resistance, oxidation resistance and the like, and has the characteristics of good mechanical strength, excellent antibacterial performance and the like.
The preparation method provided by the invention is simple and easy to operate, low in cost, more environment-friendly, high in economic benefit and suitable for large-scale industrial production.
Detailed Description
The following further describes embodiments of the present invention.
The invention provides a preparation method of a graphene polysulfone ultrafiltration membrane, which comprises the following steps: step 1, preparing graphene powder; step 2, dissolving graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution; step 3, adding polysulfone, polyvinylidene fluoride and polyvinylpyrrolidone into a stirring kettle, heating, preserving heat and stirring uniformly; step 4, sequentially adding a first additive and a first auxiliary agent into the reaction kettle, and continuously stirring; step 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring; step 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat and continuously stirring to prepare a primary membrane casting solution; step 7, performing vacuum defoaming on the primary membrane casting solution to prepare a graphene polysulfone membrane casting solution; and 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
Preferably, the graphene powder in step 1 is prepared by any one or more methods of a mechanical exfoliation method, a chemical vapor deposition method, a redox method, and the like.
In the step 2, the weight ratio of the graphene powder to the organic solvent is (2-4) - (6-8), and the organic solvent contains acetone and/or butanone.
And step 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
In the step 4, the stirring time is 10-30 minutes.
In step 5, the stirring time is 30-50 minutes.
In the step 6, the temperature is kept and the stirring is continued for 2 to 3 hours.
And 7, carrying out vacuum defoaming on the primary casting solution under the conditions of keeping the pressure of 1-5MPA and the temperature of 80-180 ℃.
The invention also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% -60% of polysulfone, 10% -15% of polyvinylidene fluoride, 5% -10% of polyvinylpyrrolidone, 1% -5% of graphene, 10% -15% of a first additive, 10% -15% of a second additive, 1% -5% of a first auxiliary agent and 1% -5% of a second auxiliary agent.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises any one or more of sodium chloride, zinc oxide and magnesium sulfate; the second auxiliary agent comprises any one or more of n-heptane, polyethylene glycol and potassium phosphate.
The following will further describe the graphene polysulfone ultrafiltration membrane and the preparation method thereof provided by the present invention with reference to the following examples.
Example 1
A preparation method of a graphene polysulfone ultrafiltration membrane comprises the following steps:
step 1, preparing graphene powder.
The graphene powder is prepared by a mechanical stripping method.
And 2, dissolving the graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution.
The weight ratio of the graphene powder to the organic solvent is 2:8, and the organic solvent contains acetone.
And 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
And 4, sequentially adding the first additive and the first auxiliary agent into the reaction kettle, and continuously stirring for 10-30 minutes.
And 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring for 30-50 minutes.
And 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat, and continuously stirring for 2-3 hours to prepare a primary membrane casting solution.
And 7, carrying out vacuum defoaming on the primary membrane casting solution under the conditions of keeping the air pressure of 1-5MPA and the temperature of 80-180 ℃ to prepare the graphene polysulfone membrane casting solution.
And 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
The embodiment also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 60% of polysulfone, 10% of polyvinylidene fluoride, 5% of polyvinylpyrrolidone, 1% of graphene, 10% of a first additive, 10% of a second additive, 2% of a first additive and 2% of a second additive.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises sodium chloride; the second aid comprises n-heptane.
Example 2
A preparation method of a graphene polysulfone ultrafiltration membrane comprises the following steps:
step 1, preparing graphene powder.
The graphene powder is prepared by a chemical vapor deposition method.
And 2, dissolving the graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution.
The weight ratio of the graphene powder to the organic solvent is 4:6, and the organic solvent contains butanone.
And 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
And 4, sequentially adding the first additive and the first auxiliary agent into the reaction kettle, and continuously stirring for 10-30 minutes.
And 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring for 30-50 minutes.
And 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat, and continuously stirring for 2-3 hours to prepare a primary membrane casting solution.
And 7, carrying out vacuum defoaming on the primary membrane casting solution under the conditions of keeping the air pressure of 1-5MPA and the temperature of 80-180 ℃ to prepare the graphene polysulfone membrane casting solution.
And 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
The embodiment also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% of polysulfone, 15% of polyvinylidene fluoride, 9% of polyvinylpyrrolidone, 2% of graphene, 11% of a first additive, 11% of a second additive, 1% of a first additive and 1% of a second additive.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises zinc oxide; the second auxiliary agent comprises polyethylene glycol.
Example 3
A preparation method of a graphene polysulfone ultrafiltration membrane comprises the following steps:
step 1, preparing graphene powder.
The graphene powder is prepared by an oxidation-reduction method.
And 2, dissolving the graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution.
The weight ratio of the graphene powder to the organic solvent is 3:7, and the organic solvent contains acetone and butanone.
And 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
And 4, sequentially adding the first additive and the first auxiliary agent into the reaction kettle, and continuously stirring for 10-30 minutes.
And 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring for 30-50 minutes.
And 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat, and continuously stirring for 2-3 hours to prepare a primary membrane casting solution.
And 7, carrying out vacuum defoaming on the primary membrane casting solution under the conditions of keeping the air pressure of 1-5MPA and the temperature of 80-180 ℃ to prepare the graphene polysulfone membrane casting solution.
And 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
The embodiment also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% of polysulfone, 10% of polyvinylidene fluoride, 10% of polyvinylpyrrolidone, 3% of graphene, 10% of a first additive, 10% of a second additive, 2% of a first additive and 5% of a second additive.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises magnesium sulfate; the second adjuvant comprises potassium phosphate.
Example 4
A preparation method of a graphene polysulfone ultrafiltration membrane comprises the following steps:
step 1, preparing graphene powder.
The graphene powder is prepared by a mechanical stripping method or a chemical vapor deposition method.
And 2, dissolving the graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution.
The weight ratio of the graphene powder to the organic solvent is 2.5:7.5, and the organic solvent contains acetone.
And 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
And 4, sequentially adding the first additive and the first auxiliary agent into the reaction kettle, and continuously stirring for 10-30 minutes.
And 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring for 30-50 minutes.
And 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat, and continuously stirring for 2-3 hours to prepare a primary membrane casting solution.
And 7, carrying out vacuum defoaming on the primary membrane casting solution under the conditions of keeping the air pressure of 1-5MPA and the temperature of 80-180 ℃ to prepare the graphene polysulfone membrane casting solution.
And 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
The embodiment also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% of polysulfone, 10% of polyvinylidene fluoride, 5% of polyvinylpyrrolidone, 4% of graphene, 10% of a first additive, 15% of a second additive, 5% of a first additive and 1% of a second additive.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises sodium chloride and zinc oxide; the second auxiliary agent comprises polyethylene glycol and potassium phosphate.
Example 5
Step 1, preparing graphene powder.
The graphene powder is prepared by a chemical vapor deposition method and an oxidation-reduction method.
And 2, dissolving the graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution.
The weight ratio of the graphene powder to the organic solvent is 3.5:6.5, and the organic solvent contains butanone.
And 3, adding the polysulfone, the polyvinylidene fluoride and the polyvinylpyrrolidone into a stirring kettle, heating for 1-4h, keeping the temperature within the range of 100-150 ℃, and uniformly stirring.
And 4, sequentially adding the first additive and the first auxiliary agent into the reaction kettle, and continuously stirring for 10-30 minutes.
And 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring for 30-50 minutes.
And 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat, and continuously stirring for 2-3 hours to prepare a primary membrane casting solution.
And 7, carrying out vacuum defoaming on the primary membrane casting solution under the conditions of keeping the air pressure of 1-5MPA and the temperature of 80-180 ℃ to prepare the graphene polysulfone membrane casting solution.
And 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane. The ranges of the parameters of the spinning process are set conventionally in the art.
The embodiment also provides the graphene polysulfone ultrafiltration membrane prepared by the method.
The graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% of polysulfone, 10% of polyvinylidene fluoride, 5% of polyvinylpyrrolidone, 5% of graphene, 15% of a first additive, 10% of a second additive, 1.5% of a first additive and 3.5% of a second additive.
Preferably, the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises any one or more of sodium chloride, zinc oxide and magnesium sulfate; the second auxiliary agent comprises any one or more of n-heptane, polyethylene glycol and potassium phosphate.
According to the graphene polysulfone ultrafiltration membrane and the preparation method thereof provided by the invention, the graphene is added into the polysulfone ultrafiltration membrane, so that the antibacterial performance, tensile strength, compressive strength and other mechanical performance strengths of the polysulfone ultrafiltration membrane are improved, and the prepared graphene polysulfone ultrafiltration membrane has the main characteristics of good antibacterial property, high mechanical strength and the like.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A preparation method of a graphene polysulfone ultrafiltration membrane is characterized by comprising the following steps:
step 1, preparing graphene powder;
step 2, dissolving graphene powder in an organic solvent, and uniformly stirring to prepare a graphene mixed solution;
step 3, adding polysulfone, polyvinylidene fluoride and polyvinylpyrrolidone into a stirring kettle, heating, preserving heat and stirring uniformly;
step 4, sequentially adding a first additive and a first auxiliary agent into the reaction kettle, and continuously stirring;
step 5, sequentially adding a second additive and a second auxiliary agent into the reaction kettle, and continuously stirring;
step 6, pouring the graphene mixed solution obtained in the step 2 into a reaction kettle, preserving heat and continuously stirring to prepare a primary membrane casting solution;
step 7, performing vacuum defoaming on the primary membrane casting solution to prepare a graphene polysulfone membrane casting solution;
and 8, turning on an air compressor, switching on a power supply, using spinning equipment, sequentially forming the membrane casting solution through a spinneret orifice, removing redundant solvent through a solvent tank, and stretching and shaping through a spinning roller to finally obtain the graphene polysulfone ultrafiltration membrane.
2. The preparation method of the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in the step 2, the weight ratio of the graphene powder to the organic solvent is (2-4) to (6-8), and the organic solvent contains acetone and/or butanone.
3. The method for preparing the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in the step 3, polysulfone, polyvinylidene fluoride and polyvinylpyrrolidone are added into a stirring kettle, heated for 1-4h, kept at the temperature of 100-150 ℃ and stirred uniformly.
4. The method for preparing the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in the step 4, the stirring time is 10-30 minutes.
5. The method for preparing the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in the step 5, the stirring time is 30-50 minutes.
6. The method for preparing the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in the step 6, the heat preservation and the stirring are continued for 2-3 h.
7. The method for preparing the graphene polysulfone ultrafiltration membrane according to claim 1, wherein in step 7, the primary membrane casting solution is subjected to vacuum defoamation under the condition of maintaining 1-5MPA air pressure and 80-180 ℃.
8. A graphene polysulfone ultrafiltration membrane prepared by the method of any one of claims 1-7.
9. The graphene polysulfone ultrafiltration membrane according to claim 8, wherein the graphene polysulfone ultrafiltration membrane comprises the following raw materials in percentage by mass: 50% -60% of polysulfone, 10% -15% of polyvinylidene fluoride, 5% -10% of polyvinylpyrrolidone, 1% -5% of graphene, 10% -15% of a first additive, 10% -15% of a second additive, 1% -5% of a first auxiliary agent and 1% -5% of a second auxiliary agent.
10. The graphene polysulfone ultrafiltration membrane of claim 9, wherein the first additive comprises N-methyl acetamide and the second additive comprises N-methyl pyrrolidone; the first auxiliary agent comprises any one or more of sodium chloride, zinc oxide and magnesium sulfate; the second auxiliary agent comprises any one or more of n-heptane, polyethylene glycol and potassium phosphate.
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