CN113680210B - Nanofiltration membrane for separating low-valence ions and preparation method thereof - Google Patents
Nanofiltration membrane for separating low-valence ions and preparation method thereof Download PDFInfo
- Publication number
- CN113680210B CN113680210B CN202110940936.2A CN202110940936A CN113680210B CN 113680210 B CN113680210 B CN 113680210B CN 202110940936 A CN202110940936 A CN 202110940936A CN 113680210 B CN113680210 B CN 113680210B
- Authority
- CN
- China
- Prior art keywords
- nanofiltration membrane
- solution
- low
- membrane
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 74
- 238000001728 nano-filtration Methods 0.000 title claims abstract description 53
- 150000002500 ions Chemical class 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229920000642 polymer Polymers 0.000 claims abstract description 27
- 229920002492 poly(sulfone) Polymers 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000012805 post-processing Methods 0.000 claims abstract description 4
- 239000000178 monomer Substances 0.000 claims description 24
- 239000002904 solvent Substances 0.000 claims description 19
- 239000012074 organic phase Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- 239000008346 aqueous phase Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- GGQQNYXPYWCUHG-RMTFUQJTSA-N (3e,6e)-deca-3,6-diene Chemical compound CCC\C=C\C\C=C\CC GGQQNYXPYWCUHG-RMTFUQJTSA-N 0.000 claims description 3
- 229930185605 Bisphenol Natural products 0.000 claims description 3
- OPGOLNDOMSBSCW-CLNHMMGSSA-N Fursultiamine hydrochloride Chemical compound Cl.C1CCOC1CSSC(\CCO)=C(/C)N(C=O)CC1=CN=C(C)N=C1N OPGOLNDOMSBSCW-CLNHMMGSSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 229920001007 Nylon 4 Polymers 0.000 claims description 3
- 239000004695 Polyether sulfone Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 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 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 150000004985 diamines Chemical class 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010954 inorganic particle Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920006393 polyether sulfone Polymers 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- JIWBIWFOSCKQMA-UHFFFAOYSA-N stearidonic acid Natural products CCC=CCC=CCC=CCC=CCCCCC(O)=O JIWBIWFOSCKQMA-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 17
- 239000011148 porous material Substances 0.000 abstract description 10
- 230000014759 maintenance of location Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 27
- 239000002585 base Substances 0.000 description 10
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 10
- 229940012189 methyl orange Drugs 0.000 description 10
- 159000000000 sodium salts Chemical class 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
- 241000282376 Panthera tigris Species 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 150000001450 anions Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- 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
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- 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
- B01D69/10—Supported membranes; Membrane supports
-
- 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
- B01D69/10—Supported membranes; Membrane supports
- B01D69/105—Support pretreatment
-
- 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
- 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
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of nanofiltration membranes, in particular to a nanofiltration membrane for low-valence ion separation and a preparation method thereof, wherein the nanofiltration membrane for low-valence ion separation comprises a support body, a polysulfone layer arranged on the support body for enhancing mechanical strength, and a polymer thin layer arranged on the polysulfone layer for separating low-valence ions; the preparation method of the nanofiltration membrane for low-valence ion separation comprises the following steps: s1, preparing a support body; s2, preparing film-making liquid; s3, preparing a base film; s4, preparing a polymer thin layer; s5, post-processing. The nanofiltration membrane for separating low-valence ions comprises a support body, a polysulfone layer arranged on the support body for enhancing mechanical strength, and a polymer thin layer arranged on the polysulfone layer for separating low-valence ions, wherein the base membrane formed by the support body and the polysulfone layer has equivalent pore density, pore diameter and pore diameter distribution, good pressure-resistant tightness and physical-chemical stability, and the arrangement of the polymer thin layer ensures separation requirements, reduces mass transfer resistance of the membrane and has better water flux and retention rate.
Description
Technical Field
The invention relates to the technical field of nanofiltration membranes, in particular to a nanofiltration membrane for low-valence ion separation and a preparation method thereof.
Background
Nanofiltration membranes are functional semi-permeable membranes with pore sizes above 1nm, typically 1-2nm, allowing the permeation of solvent molecules or certain low molecular weight solutes or low-valent ions. It is a special and very promising separation membrane variety, it is named because of the size of the trapped substance about nanometers, it traps the molecular weight of the organic matter about 150-500, the ability to trap soluble salt is between 20-98%, desalt the monovalent anion salt solution is lower than the high-valence anion salt solution. Is used for removing organic matters and chromaticity of surface water, removing hardness of groundwater, partially removing soluble salts, concentrating fruit juice, separating useful substances in medicines, and the like.
The wide application of the nanofiltration membrane drives the selection of membrane materials and the deep research of membrane performance, wherein the research direction is heat-resistant, acid-alkali-resistant, oxidation-resistant, high-water flux, high-rejection rate and pollution-resistant, and the high-water flux is an important factor for measuring the performance of the nanofiltration membrane, but the water flux of the traditional nanofiltration membrane is not high, and the capability of the nanofiltration membrane on sewage treatment is poor, so that the improvement of the water flux of the nanofiltration membrane is an important research direction.
Disclosure of Invention
The invention provides a nanofiltration membrane for low-valence ion separation and a preparation method thereof, aiming at the defects of the prior art.
The invention solves the technical problems by the following technical means:
nanofiltration membranes for low-valence ion separation comprise,
the supporting body is provided with a plurality of supporting bodies,
a polysulfone layer provided on the support to enhance mechanical strength,
and a thin polymer layer disposed on the polysulfone layer to separate low valence ions.
The preparation method of the nanofiltration membrane for low-valence ion separation comprises the following steps:
s1, preparing a support: the weight ratio is as follows: nano inorganic particles: styrene-isoprene-styrene block copolymer: stearidonic acid: poly internal olefins= (11-14): (35-40): (4-6): (10-12) adding the mixture into deionized water for ultrasonic dispersion, and heating in a water bath until solvent water is evaporated to obtain an intermediate;
the weight ratio is as follows: intermediate: sulfonated polyethersulfone powder: uniformly mixing additive=1.05:4:0.3, putting into an extruder, melting and extruding by the extruder, and spinning into a nanofiltration membrane support body by a spinneret plate;
s2, preparing a film-making liquid: weighing a polymer and a solvent to prepare a polymer solution with the mass fraction of 17% -18%;
adding a pore-forming agent into the polymer solution, and stirring until the pore-forming agent is completely dissolved to obtain a film-forming solution with the mass fraction of 0.5% -4%;
wherein the polymer is polysulfone, the solvent is N-methyl pyrrolidone, and the pore-forming agent is polypyrrolidone;
s3, casting a film forming liquid on the surface of the support, after the solvent in the film forming liquid is partially volatilized, immersing the film forming liquid in a non-solvent solution, and solidifying the film forming liquid in water by exchanging water and the solvent to obtain a base film;
s4, preparing a polymer thin layer: immersing the base film into an aqueous phase monomer solution, taking out the base film, discharging excessive solution, immersing the base film into an organic phase monomer solution, and carrying out polymerization reaction on the interface of the aqueous phase monomer solution and the organic phase monomer solution to form a polymer thin layer;
s5, post-processing: and carrying out heat treatment and ion radiation treatment on the filtering membrane.
As an improvement of the technical scheme, in the aqueous monomer solution, the aqueous monomer is any one of diamine, polyvinyl alcohol and bisphenol or a mixture thereof;
in the organic phase monomer solution, the organic phase monomer is any one of diacyl chloride and triacyl chloride or a mixture thereof.
The invention has the beneficial effects that:
the nanofiltration membrane for separating low-valence ions comprises a support body, a polysulfone layer arranged on the support body for enhancing mechanical strength and a polymer thin layer arranged on the polysulfone layer for separating low-valence ions, wherein the base membrane formed by the support body and the polysulfone layer has equivalent pore density, pore diameter and pore diameter distribution, has good pressure-resistant tightness and physical-chemical stability, ensures separation requirements, reduces mass transfer resistance of the membrane and has better water flux and retention rate.
The nanofiltration membrane for low-valence ion separation manufactured by the preparation method improves the water flux of the nanofiltration membrane, improves the sewage treatment capacity of the nanofiltration membrane, and performs post-treatment after the nanofiltration membrane is polymerized to form a membrane so as to obtain the nanofiltration membrane with higher molecular weight, so that the nanofiltration membrane has better performance.
Drawings
FIG. 1 is a graph showing the comparison of water flux and retention rates of nanofiltration membranes and conventional nanofiltration membranes in examples of the present invention;
wherein: w (W) S Water flux for experimental group 1; w (W) D Water flux for control group 1; r is R S The entrapment rate of the sodium salt (RB) of the tiger red of the experimental group 1; r is R D The entrapment rate of the sodium salt (RB) of the tiger red sodium salt in the control group 1; m is M S Methyl Orange (MO) rejection for experimental group 1; m is M D Is the retention rate of Methyl Orange (MO) of the control group.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Examples
Nanofiltration membranes for low-valence ion separation comprise,
the supporting body is provided with a plurality of supporting bodies,
a polysulfone layer provided on the support to enhance mechanical strength,
and a thin polymer layer disposed on the polysulfone layer to separate low valence ions.
The preparation method of the nanofiltration membrane for low-valence ion separation comprises the following steps:
s1, preparing a support: the weight ratio is as follows: nano inorganic particles: styrene-isoprene-styrene block copolymer: stearidonic acid: poly internal olefins= (11-14): (35-40): (4-6): (10-12) adding the mixture into deionized water for ultrasonic dispersion, and heating in a water bath until solvent water is evaporated to obtain an intermediate;
the weight ratio is as follows: intermediate: sulfonated polyethersulfone powder: uniformly mixing additive=1.05:4:0.3, putting into an extruder, melting and extruding by the extruder, and spinning into a nanofiltration membrane support body by a spinneret plate;
s2, preparing a film-making liquid: weighing a polymer and a solvent to prepare a polymer solution with the mass fraction of 17% -18%;
adding a pore-forming agent into the polymer solution, and stirring until the pore-forming agent is completely dissolved to obtain a film-forming solution with the mass fraction of 0.5% -4%;
wherein the polymer is polysulfone, the solvent is N-methyl pyrrolidone, and the pore-forming agent is polypyrrolidone;
s3, casting a film forming liquid on the surface of the support, after the solvent in the film forming liquid is partially volatilized, immersing the film forming liquid in a non-solvent solution, and solidifying the film forming liquid in water by exchanging water and the solvent to obtain a base film;
s4, preparing a polymer thin layer: immersing the base film into an aqueous phase monomer solution, taking out the base film, discharging excessive solution, immersing the base film into an organic phase monomer solution, and carrying out polymerization reaction on the interface of the aqueous phase monomer solution and the organic phase monomer solution to form a polymer thin layer;
s5, post-processing: and carrying out heat treatment and ion radiation treatment on the filtering membrane.
In the aqueous monomer solution, the aqueous monomer is any one of diamine, polyvinyl alcohol and bisphenol or a mixture thereof;
in the organic phase monomer solution, the organic phase monomer is any one of diacyl chloride and triacyl chloride or a mixture thereof.
Comparative analysis experiments were performed on the nanofiltration membrane prepared by the preparation method of example 1 and the general nanofiltration membrane prepared by the existing preparation method.
1. Experimental objects
The control group 1 adopts a common nanofiltration membrane, and the experimental group 1 adopts the nanofiltration membrane prepared by the preparation method of the example 1.
2. Experimental method
The nanofiltration membrane prepared by the preparation method of example 1 was subjected to measurement of pure water flux and membrane rejection rate of the common nanofiltration membrane by using a conventional inspection method of the prior art. Wherein,,
measurement of pure water flux:
the filtration experiments in the experimental method all adopt dead-end filtration devices, and the effective area of the membrane is 44X10 -4 m 2 The filtration experiments were all carried out at room temperature at 2bar (N 2 ) The membrane was pre-pressed with pure water for 0.5 hours to achieve a stable flux, after which the permeate flux P of the nanofiltration membrane was calculated through pure water, with the formula:
wherein V is the penetration volume; a is the effective area of the membrane; t is the filtering time; Δp is osmotic pressure.
Measurement of membrane rejection:
the entrapment effect of the nanofiltration membrane on Methyl Orange (MO) and tiger red sodium salt (RB) is characterized. The dye solution of 35uM was filtered at room temperature and a pressure of 2bar, and the rejection rate R (%) of the membrane was calculated as follows:
wherein: c (C) p Is the concentration of the permeate, C f Is the concentration of fuel in the stock solution.
3. Experimental results
Referring to fig. 1, it can be seen from the results of fig. 1 that the water flux of the nanofiltration membrane in the experimental group 1 is higher than that of the nanofiltration membrane in the control group 1, the retention rate of Methyl Orange (MO) of the nanofiltration membrane in the experimental group 1 is higher than that of the Methyl Orange (MO) in the control group 1, and the retention rate of tiger red sodium salt (RB) of the nanofiltration membrane in the experimental group 1 is higher than that of the control group 1.
The nanofiltration membrane for separating low-valence ions comprises a support body, a polysulfone layer arranged on the support body for enhancing mechanical strength and a polymer thin layer arranged on the polysulfone layer for separating low-valence ions, wherein the base membrane formed by the support body and the polysulfone layer has equivalent pore density, pore diameter and pore diameter distribution, has good pressure-resistant tightness and physical-chemical stability, ensures separation requirements, reduces mass transfer resistance of the membrane and has better water flux and retention rate.
The nanofiltration membrane for low-valence ion separation manufactured by the preparation method improves the water flux and the retention rate of the nanofiltration membrane, improves the sewage treatment capacity of the nanofiltration membrane, and performs post-treatment after the nanofiltration membrane is polymerized to form a membrane so as to obtain the nanofiltration membrane with higher molecular weight, so that the nanofiltration membrane has better performance.
It is noted that relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. Nanofiltration membrane for low-valence ion separation, which is characterized in that: comprising the steps of (a) a step of,
the supporting body is provided with a plurality of supporting bodies,
a polysulfone layer provided on the support to enhance mechanical strength,
and a thin polymer layer disposed on the polysulfone layer to separate low valence ions;
the preparation method also comprises the following steps:
s1, preparing a support: the weight ratio is as follows: nano inorganic particles: styrene-isoprene-styrene block copolymer: stearidonic acid: poly internal olefins= (11-14): (35-40): (4-6): (10-12) adding the mixture into deionized water for ultrasonic dispersion, and heating in a water bath until solvent water is evaporated to obtain an intermediate;
the weight ratio is as follows: intermediate: sulfonated polyethersulfone powder: uniformly mixing additive=1.05:4:0.3, putting into an extruder, melting and extruding by the extruder, and spinning into a nanofiltration membrane support body by a spinneret plate;
s2, preparing a film-making liquid: weighing a polymer and a solvent to prepare a polymer solution with the mass fraction of 17% -18%;
adding a pore-forming agent into the polymer solution, and stirring until the pore-forming agent is completely dissolved to obtain a film-forming solution with the mass fraction of 0.5% -4%;
wherein the polymer is polysulfone, the solvent is N-methyl pyrrolidone, and the pore-forming agent is polypyrrolidone;
s3, casting a film forming liquid on the surface of the support, after the solvent in the film forming liquid is partially volatilized, immersing the film forming liquid in a non-solvent solution, and solidifying the film forming liquid in water by exchanging water and the solvent to obtain a base film;
s4, preparing a polymer thin layer: immersing the base film into an aqueous phase monomer solution, taking out the base film, discharging excessive solution, immersing the base film into an organic phase monomer solution, and carrying out polymerization reaction on the interface of the aqueous phase monomer solution and the organic phase monomer solution to form a polymer thin layer;
s5, post-processing: and carrying out heat treatment and ion radiation treatment on the filtering membrane.
2. The nanofiltration membrane for low-valent ion separation according to claim 1, wherein: in the aqueous monomer solution, the aqueous monomer is any one of diamine, polyvinyl alcohol and bisphenol or a mixture thereof;
in the organic phase monomer solution, the organic phase monomer is any one of diacyl chloride and triacyl chloride or a mixture thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940936.2A CN113680210B (en) | 2021-08-17 | 2021-08-17 | Nanofiltration membrane for separating low-valence ions and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940936.2A CN113680210B (en) | 2021-08-17 | 2021-08-17 | Nanofiltration membrane for separating low-valence ions and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113680210A CN113680210A (en) | 2021-11-23 |
| CN113680210B true CN113680210B (en) | 2023-07-28 |
Family
ID=78580143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110940936.2A Active CN113680210B (en) | 2021-08-17 | 2021-08-17 | Nanofiltration membrane for separating low-valence ions and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113680210B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548975A (en) * | 2013-04-28 | 2015-04-29 | 泉州索爱膜科技开发有限公司 | Tubular composite nanofiltration membrane |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004237230A (en) * | 2003-02-07 | 2004-08-26 | Toray Ind Inc | Composite semipermeable membrane and its manufacturing method |
| CN100493689C (en) * | 2004-08-04 | 2009-06-03 | 四川大学 | Polyaryl ether sulphone compound separation membrane and its preparation method |
| CN102059114B (en) * | 2010-12-02 | 2012-11-14 | 华南师范大学 | Anode porous array catalyst Pt-HxMoO3 for direct methanol fuel cell and preparation method thereof |
| WO2015020337A1 (en) * | 2013-08-06 | 2015-02-12 | 주식회사 아모그린텍 | Filter medium for liquid filter and method for manufacturing same |
| CN105958117A (en) * | 2016-06-29 | 2016-09-21 | 华南师范大学 | Nano particle doped gel polymer electrolyte, preparation method thereof and application |
| WO2018000361A1 (en) * | 2016-06-30 | 2018-01-04 | 中国石油大学(华东) | Preparation method for polysulfonamide nanofiltration or reverse osmosis composite membrane by molecular layer assembly |
| CN106975368A (en) * | 2016-10-20 | 2017-07-25 | 北京碧水源膜科技有限公司 | A kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film |
| CN106621836B (en) * | 2016-12-22 | 2019-08-23 | 北京碧水源膜科技有限公司 | A kind of nanofiltration membrane and preparation method thereof for integral and intelligent clear water faucet |
| CN108479422B (en) * | 2018-04-09 | 2020-11-27 | 东莞市石鼓污水处理有限公司 | Nanofiltration membrane |
| WO2020124362A1 (en) * | 2018-12-18 | 2020-06-25 | 大连理工大学 | Preparation method and application of conductive polymer/carbon nanotube composite nanofiltration membrane |
| CN110270235A (en) * | 2019-05-06 | 2019-09-24 | 埃姆媞（无锡）分离技术有限公司 | The composite nanometer filtering film that a kind of pair of monovalence, divalent salts efficiently separate |
| TWM605604U (en) * | 2020-07-28 | 2020-12-21 | 新長豐實業股份有限公司 | Nanofiltration composite membrane |
| CN112717706B (en) * | 2020-11-03 | 2022-06-10 | 浙江师范大学 | Metal organic framework ZIF-8 film, preparation method and application thereof |
-
2021
- 2021-08-17 CN CN202110940936.2A patent/CN113680210B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548975A (en) * | 2013-04-28 | 2015-04-29 | 泉州索爱膜科技开发有限公司 | Tubular composite nanofiltration membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113680210A (en) | 2021-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9914099B2 (en) | Self-assembled block copolymer membrane | |
| CN107158980B (en) | Thin-layer composite membrane based on gas/liquid interface reaction and preparation method and application thereof | |
| Sinha et al. | Increase in hydrophilicity of polysulfone membrane using polyethylene glycol methyl ether | |
| Yang et al. | Amine-functionalized ZIF-8 nanoparticles as interlayer for the improvement of the separation performance of organic solvent nanofiltration (OSN) membrane | |
| Mobarakabad et al. | Fabrication and characterization of poly (phenylene ether-ether sulfone) based nanofiltration membranes modified by titanium dioxide nanoparticles for water desalination | |
| CN111686594B (en) | High-flux high-rejection composite membrane and preparation method thereof | |
| CN1621140A (en) | Method for preparing polyvinylidene fluoride flat plate microporous compound film | |
| CN110479109B (en) | Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance | |
| CN103861480A (en) | Preparation method of hydrophilic polyvinylidene fluoride flat sheet membrane and hollow fiber membrane | |
| CN113398777A (en) | Three-layer structure composite forward osmosis membrane with MXene drainage layer and preparation method thereof | |
| CN112058094B (en) | Loose nanofiltration membrane and preparation method thereof | |
| Liu et al. | Positively charged nanofiltration membrane fabricated by poly (acid–base) complexing effect induced phase inversion method for heavy metal removal | |
| CN114653210B (en) | High-flux pervaporation membrane based on spraying method, and preparation method and application thereof | |
| CN101721926A (en) | Sulfonated copolymerized arylene ether ketone compound nano filtration membrane containing Chinazolin ketone and preparation method thereof | |
| AU2016333025B2 (en) | Asymmetric composite membrane and a method of preparation thereof | |
| JP5880813B2 (en) | PVA porous membrane, production method thereof, and filtration filter having PVA porous membrane | |
| CN113680210B (en) | Nanofiltration membrane for separating low-valence ions and preparation method thereof | |
| CN111282455B (en) | External pressure type hollow fiber industrial nanofiltration membrane and preparation method thereof | |
| CN100438957C (en) | Preparation method of high molecule microfilter membrane and porogenic agent | |
| CN110975636A (en) | Preparation method of ultrafiltration membrane | |
| CN115999382A (en) | Nanofiltration membrane for extracting lithium from salt lake and preparation method thereof | |
| CN1583232A (en) | Manufacture and products of hollow fiber membrane of outer pressured polyvinylidene fluoride by immersion gelation | |
| Jiang et al. | Preparation and characterization of high-flux poly (m-phenylene isophthalamide)(PMIA) hollow fiber ultrafiltration membrane | |
| CN104801209A (en) | Ultralow-pressure nanofiltration membrane prepared from imidazole sulfonate grafted polyether sulfone | |
| KR20150033424A (en) | Method for preparation of polyketone flat sheet type membrane and a polyketone flat sheet type membrane by the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |