CN114146579A - Preparation method of high-flux nanofiltration membrane - Google Patents

Preparation method of high-flux nanofiltration membrane Download PDF

Info

Publication number
CN114146579A
CN114146579A CN202111543111.3A CN202111543111A CN114146579A CN 114146579 A CN114146579 A CN 114146579A CN 202111543111 A CN202111543111 A CN 202111543111A CN 114146579 A CN114146579 A CN 114146579A
Authority
CN
China
Prior art keywords
membrane
phase solution
water
pouring
flux
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.)
Pending
Application number
CN202111543111.3A
Other languages
Chinese (zh)
Inventor
吕成燕
张淋
瞿睿
徐强强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qicheng Jiangsu Purification Technologies Co ltd
Original Assignee
Qicheng Jiangsu Purification Technologies Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qicheng Jiangsu Purification Technologies Co ltd filed Critical Qicheng Jiangsu Purification Technologies Co ltd
Priority to CN202111543111.3A priority Critical patent/CN114146579A/en
Publication of CN114146579A publication Critical patent/CN114146579A/en
Pending legal-status Critical Current

Links

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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A preparation method of a high-flux nanofiltration membrane. The preparation method of the high-flux nanofiltration membrane is simple in process preparation process, low in cost and easy to realize industrial production. The method comprises the following steps: s1: soaking the polysulfone base membrane prepared by the non-solvent induced phase separation method in deionized water for 12-24 h, taking out, and washing with clear water; s2: fixing the polysulfone base membrane in a manual membrane frame, pouring a water phase solution, immersing the surface of the polysulfone base membrane, pouring the water phase solution after reacting for 1-3min, and pressing residual liquid drops on the surface of the polysulfone base membrane by using a press roller to ensure that no water drops exist on the surface of the polysulfone base membrane; s3: pouring the organic phase solution into a manual membrane frame placed with a polysulfone base membrane, immersing the surface of the manual membrane frame, reacting for 30-60s, pouring out the organic phase solution, drying the organic phase solution in a drying oven with the set temperature of 35-80 ℃, and taking out the membrane for later use after the heat treatment is finished; the invention has low cost, is easy for industrial amplification, realizes industrial production and has better industrial application prospect.

Description

Preparation method of high-flux nanofiltration membrane
Technical Field
The invention relates to the technical field of water treatment nanofiltration membranes, in particular to a preparation method of a high-flux nanofiltration membrane.
Background
Nanofiltration is a novel membrane manufacturing technology which is between reverse osmosis and ultrafiltration and driven by pressure, is a novel separation membrane which is produced in the late stage of the last eighties of the century, has the molecular weight cutoff between ultrafiltration and reverse osmosis, is about 200 plus 1000DA, has lower operating pressure, higher rejection rate on bivalent and multivalent ions and very low rejection rate on monovalent ions, is particularly suitable for separating organic matters with the molecular weight of hundreds of and bivalent or multivalent ions, and is widely applied to a plurality of fields of chemical industry, environmental protection, food, medicine, ocean, metallurgy and the like.
The nanofiltration membrane can be used for intercepting bivalent and multivalent ions and retaining monovalent ions, can be used for purifying municipal water and household water, removing harmful substances such as heavy metal ions and bacteria in water, and retaining part of beneficial mineral substances such as potassium and sodium in water. Commercial nanofiltration membranes have been developed and the properties are shown in the following table:
Figure BDA0003414912400000011
the high-flux nanofiltration membrane is always the development direction of the nanofiltration membrane research, the flux of the nanofiltration membrane has a certain promotion space in the actual production process, the flux of the current nanofiltration membrane is between 35 and 50LMH and is trapped between 96 and 99 percent according to the performances of the developed commercial nanofiltration membranes in the table above, and the commercial nanofiltration membrane generally has low requirements on trapping and certain requirements on flux when being used for purifying municipal water or household water. Under the condition of ensuring a certain retention rate, the higher the flux is, the lower the cost for operating the membrane system is, and the energy consumption can be effectively reduced. In order to increase the flux of the nanofiltration membrane, the following methods are generally adopted:
1. the non-woven fabric material is changed, and the nano composite material with high surface strength, high porosity and good internal connectivity is adopted
2. The nanometer filler additive adopts molecular sieve, carbon nanotube, nanometer particle, etc. to raise the roughness of the surface of the film
3. And adding additives for accelerating the polymerization reaction, such as sodium hydroxide, pyridine and the like into the water phase.
Although the method can improve the flux of the nanofiltration membrane, the method has a plurality of defects, such as changing a non-woven fabric material, selecting a nano fiber material as the non-woven fabric material, having poor durability, and easily cracking along a certain direction because the fibers are arranged along a certain direction; the nano filler additive has poor dispersibility and is easy to run off in the using process; the industrial application has certain limitation on materials, for example, nano filler additives such as molecular sieves, carbon nanotubes and the like are added into a water phase, so that the cost is high, and the large-scale industrial production value is not realized.
Disclosure of Invention
Aiming at the problems, the invention provides the preparation method of the high-flux nanofiltration membrane, which has the advantages of simple process preparation process, low cost and easy realization of industrial production.
The technical scheme of the invention is as follows: a preparation method of a high-flux nanofiltration membrane comprises the following steps:
s1: soaking the polysulfone base membrane prepared by the non-solvent induced phase separation method in deionized water for 12-24 h, taking out, and washing with clear water;
s2: fixing the polysulfone base membrane in a manual membrane frame, pouring a water phase solution, immersing the surface of the polysulfone base membrane, pouring the water phase solution after reacting for 1-3min, and pressing residual liquid drops on the surface of the polysulfone base membrane by using a press roller to ensure that no water drops exist on the surface of the polysulfone base membrane;
s3: pouring the organic phase solution into a manual membrane frame placed with a polysulfone base membrane, immersing the surface of the manual membrane frame, reacting for 30-60s, pouring out the organic phase solution, drying the organic phase solution in a drying oven with the set temperature of 35-80 ℃, and taking out the membrane for later use after the heat treatment is finished;
s4: soaking the membrane sheet after the heat treatment in the step S3 in an alcohol solvent for 1-3 min; and after soaking, putting the membrane into deionized water to soak for 1-3min to remove the alcohol solvent, and finally obtaining the high-flux nanofiltration membrane.
The aqueous phase solution in step S2 includes piperazine and an acidic additive.
The acidic additive comprises one of hydrochloric acid, tannic acid, citric acid, oxalic acid or acetic acid.
The concentration of piperazine in the aqueous phase solution is 1% -4% w/v, the concentration of the acidic additive is 0.1% -2% w/v, and the temperature of the aqueous phase solution is 30-35 ℃.
The organic phase solution in step S3 includes trimesoyl chloride and an organic solvent.
The concentration of trimesoyl chloride in the organic phase solution is 0.05-2.5% w/v, and the temperature of the organic solvent is controlled at 40-50 ℃.
The organic solvent comprises one of n-hexane, ethylcyclohexane, ethylene oxide, n-dodecane and Isopar G or a mixture of n-hexane, ethylcyclohexane, ethylene oxide, n-dodecane and Isopar G in any proportion.
The alcohol solvent in step S4 includes one of methanol and ethanol or a mixture thereof in any proportion.
The concentration of the alcohol solvent is 0-15% w/v.
The method is used for slowing down the polymerization reaction speed and reducing the polyamide crosslinking degree by adding the acidic additive into the water phase, and simultaneously, the polyamide is swelled by adopting an alcohol washing mode during post-treatment to generate a looser microstructure so as to obtain the high-flux nanofiltration membrane.
Detailed Description
A preparation method of a high-flux nanofiltration membrane comprises the following steps:
s1: soaking the polysulfone base membrane prepared by a non-solvent induced phase separation method in deionized water for 12-24 hours to achieve the purpose of dissolving out a water-soluble additive in the polysulfone base membrane, improving the porosity of the base membrane, taking out, and drying surface water drops by using an air knife;
s2: fixing a polysulfone basal membrane (the polysulfone basal membrane is prepared by a non-solvent induced phase separation method, using DMF, DMAC and the like as solvents, using polysulfone and water-soluble additives as solutes, wherein the additives comprise PVP, PEG and the like) in a manual membrane frame, pouring a water phase solution, immersing the surface of the polysulfone basal membrane, reacting for 1-3min (facilitating the full deposition of the water phase on the surface of the polysulfone basal membrane), pouring the water phase solution, pressing residual liquid drops on the surface of the polysulfone basal membrane by a press roller, and ensuring that no water drops exist on the surface of the polysulfone basal membrane;
s3: pouring the organic phase solution into a manual membrane frame for placing a polysulfone-based membrane, immersing the surface of the manual membrane frame, reacting for 30-60s, pouring out the organic phase solution, drying the organic phase solution in a drying oven with a set temperature of 35-80 ℃, wherein the drying time of heat treatment is 10-15min, and taking out the membrane for later use after the heat treatment (after the heat treatment is used for forming the membrane, removing the residual organic solvent on the membrane, further reacting the unreacted amino group and acyl chloride group to increase the crosslinking degree, and being beneficial to improving the water flux and the retention rate);
s4: soaking the membrane sheet after the heat treatment in the step S3 in an alcohol solvent for 1-3 min; and (3) after soaking (when the alcohol solvent dissolves the polyamide layer with the lower cross-linking degree on the surface part), putting the polyamide layer into deionized water to soak for 1-3min to remove the alcohol solvent, and finally obtaining the high-flux nanofiltration membrane.
The aqueous phase solution in step S2 includes piperazine and an acidic additive.
The acidic additive comprises one of hydrochloric acid, tannic acid, citric acid, oxalic acid or acetic acid.
The concentration of piperazine in the aqueous phase solution is 1% -4% w/v, the concentration of the acidic additive is 0.1% -2% w/v, and the temperature of the aqueous phase solution is 30-35 ℃. The temperature of the aqueous phase solution is above 30 ℃, so that the reaction activity of aqueous phase solute piperazine is improved.
The organic phase solution in step S3 includes trimesoyl chloride and an organic solvent.
The concentration of trimesoyl chloride in the organic phase solution is 0.05-2.5% w/v, and the temperature of the organic solvent is controlled at 40-50 ℃. Because the interfacial polymerization is carried out in the water phase, the migration efficiency of the solute trimesoyl chloride in the organic phase to the water phase is improved.
The organic solvent comprises one of n-hexane, ethylcyclohexane, ethylene oxide, n-dodecane and Isopar G or a mixture of n-hexane, ethylcyclohexane, ethylene oxide, n-dodecane and Isopar G in any proportion.
The alcohol solvent in step S4 includes one of methanol and ethanol or a mixture thereof in any proportion.
The concentration of the alcohol solvent is 0-15% w/v.
The following describes embodiments of the present invention in detail.
Example 1
And (3) soaking the polysulfone base membrane in deionized water for 12 hours, taking out the polysulfone base membrane, and drying surface water drops by using an air knife. Placing in water phase for 2min (the composition of the water phase solution is 1.5% w/v piperazine), pouring out the excess water phase solution, pressing off water beads on the surface by using an air knife or a compression roller to ensure that no water beads exist on the surface of the base membrane, placing in an organic phase for 30s (the organic phase is 0.13% w/v n-hexane solution of trimesoyl chloride), pouring out the excess organic phase, placing at room temperature for 30s (which is beneficial to prepolymerization of polyamide), placing in a 35-degree oven for heat treatment for 10min, and taking out the membrane for later use after the heat treatment is completed.
Example 2
And (3) soaking the polysulfone base membrane in deionized water for 12 hours, taking out the polysulfone base membrane, and drying surface water drops by using an air knife. Placing in water phase for 2min (the composition of the water phase solution is 1.5% w/v piperazine and 0.1% w/v hydrochloric acid), pouring out excessive water phase solution, pressing off water beads on the surface by using an air knife or a compression roller to ensure that no water beads exist on the surface of the base membrane, placing in organic phase for 30s (the organic phase is 0.13% w/v n-hexane solution of trimesoyl chloride), pouring out excessive organic phase, placing at room temperature for 30s, placing in a 35-degree oven, performing heat treatment for 10min, and taking out the membrane for later use after the heat treatment is completed.
Example 3
Preparation of a high-flux nanofiltration membrane: in the same manner as in example 2, a nanofiltration membrane was prepared as described above, and the membrane after heat treatment was placed in a 12% ethanol solution for 10min, taken out, washed with deionized water at room temperature for 2min, and the residual ethanol solution was removed, and the membrane was soaked in pure water for further use.
Example 4
The same procedure as in example 2 was followed, using the above procedure, with an aqueous solution containing 1.5% w/v piperazine and 0.5% w/v hydrochloric acid, the remainder of the procedure being as in example 2.
Example 5
Preparation of a high-flux nanofiltration membrane: as in example 4, a nanofiltration membrane was prepared as described above, and the membrane after heat treatment was placed in a 12% ethanol solution for 10min, taken out, washed with deionized water at room temperature for 2min, to remove the residual ethanol solution, and the membrane was soaked in pure water for further use.
Example 6
The same procedure as in example 2 was followed, using the above procedure, with an aqueous solution containing 1.5% w/v piperazine and 1% w/v hydrochloric acid, the rest of the procedure being as in example 2.
Example 7
Preparation of a high-flux nanofiltration membrane: as in example 6, a nanofiltration membrane was prepared as described above, the membrane after heat treatment was placed in a 12% ethanol solution for 10min, the membrane was removed, washed with deionized water at room temperature for 2min to remove the residual ethanol solution, and the membrane was soaked in pure water for further use
Example 8
The same procedure as in example 2 was followed, using the above procedure, with an aqueous solution containing 1.5% w/v piperazine and 2% w/v hydrochloric acid, the rest of the procedure being as in example 2.
Example 9
Preparation of a high-flux nanofiltration membrane: as in example 8, a nanofiltration membrane was prepared as described above, and the membrane after heat treatment was placed in a 12% ethanol solution for 10min, taken out, washed with deionized water at room temperature for 2min, to remove the residual ethanol solution, and the membrane was soaked in pure water for further use.
Example 10
The same procedure as in example 2 was followed, using the above procedure, with an aqueous solution containing 1.5% w/v piperazine and 1% w/v citric acid, the rest of the procedure being as in example 2.
Example 11
Preparation of a high-flux nanofiltration membrane: as in example 10, a nanofiltration membrane was prepared as described above, and the membrane after heat treatment was placed in a 12% ethanol solution for 10min, taken out, washed with deionized water at room temperature for 2min, to remove the residual ethanol solution, and the membrane was soaked in pure water for further use.
Example 12
The same procedure as in example 2 was followed, using the above procedure, with the aqueous solution containing 1.5% w/v piperazine and 1% w/v acetic acid, the rest of the procedure being as in example 2.
Example 13
Preparation of a high-flux nanofiltration membrane: as in example 12, a nanofiltration membrane was prepared as described above, and the membrane after heat treatment was placed in a 12% ethanol solution for 10min, taken out, washed with deionized water at room temperature for 2min, to remove the residual ethanol solution, and the membrane was soaked in pure water for further use.
Performance testing of nanofiltration membranes
The flux and interception of the nanofiltration membrane prepared by the invention are tested by a membrane performance evaluation pool under the pressure of 100psi by using 2000mg/l magnesium sulfate aqueous solution as a test solution, the interception is calculated by testing the conductivity of the test solution and the penetrating fluid, the flux is obtained by weighing the water amount of the penetrating fluid, the flux is obtained by the formula (1), and the interception is obtained by the formula (2):
Figure BDA0003414912400000051
flux of J-nanofiltration membrane (L/(m)2H)), volume of V-permeate (L), effective test area of A-nanofiltration membrane (m)2) T-test time (h)
Figure BDA0003414912400000052
R-nanofiltration membrane rejection (%), CpPermeate concentration, CfConcentration of test solution
At 5ft of effective area of the membrane2Testing under the conditions of 100psi of testing pressure and 25 ℃ of testing temperature, testing all membranes for 3 times, and averaging to obtain the result
TABLE 1
Figure BDA0003414912400000061
TABLE 2
Figure BDA0003414912400000062
TABLE 3
Figure BDA0003414912400000063
TABLE 4
Figure BDA0003414912400000064
In comparative examples 1, 2, 4, 6 and 8, the flux is increased remarkably with the increase of the addition amount of the acidic additive, and the flux is the highest when the concentration of the acidic additive is 1%; when the addition amount is increased to 2%, the flux is reduced, which shows that when the amount of the acidic additive is 1%, the inhibition on the polymerization reaction does not reduce the crosslinking degree too much, and meanwhile, the hydrophilicity of the membrane is not greatly influenced, and the hydrophilicity and the crosslinking degree of the membrane are balanced; meanwhile, compared with the examples 3, 5, 7 and 9, the flux is slightly improved along with the alcohol washing treatment of the membrane, which shows that the post-treatment process of the alcohol washing can be used for improving the flux of the membrane, and meanwhile, the middle layer with higher crosslinking degree is not damaged, and the interception is not greatly influenced; in comparative examples 6, 10 and 12, the effect of different acidic additive species on the membrane flux can be effectively improved, wherein the effect is best with hydrochloric acid.
According to the invention, on the basis of adding an acidic additive into a water phase, the membrane is subjected to alcohol washing treatment, and the high-flux nanofiltration membrane is obtained under the condition of ensuring the rejection rate. The invention adopts common chemical reagents to improve the interface polymerization process, is easy to realize industrialization and has industrial practical value.

Claims (9)

1. The preparation method of the high-flux nanofiltration membrane is characterized by comprising the following steps of:
s1: soaking the polysulfone base membrane prepared by the non-solvent induced phase separation method in deionized water for 12-24 h, taking out, and drying surface water drops by using an air knife;
s2: fixing the polysulfone base membrane in a manual membrane frame, pouring a water phase solution, immersing the surface of the polysulfone base membrane, pouring the water phase solution after reacting for 1-3min, and pressing residual liquid drops on the surface of the polysulfone base membrane by using a press roller to ensure that no water drops exist on the surface of the polysulfone base membrane;
s3: pouring the organic phase solution into a manual membrane frame placed with a polysulfone base membrane, immersing the surface of the manual membrane frame, reacting for 30-60s, pouring out the organic phase solution, drying the organic phase solution in a drying oven with the set temperature of 35-80 ℃, and taking out the membrane for later use after the heat treatment is finished;
s4: soaking the membrane sheet after the heat treatment in the step S3 in an alcohol solvent for 1-3 min; and after soaking, putting the membrane into deionized water to soak for 1-3min to remove the alcohol solvent, and finally obtaining the high-flux nanofiltration membrane.
2. The method for preparing a high-flux nanofiltration membrane according to claim 1, wherein the aqueous solution in step S2 comprises piperazine and an acidic additive.
3. The method as claimed in claim 2, wherein the acidic additive comprises one of hydrochloric acid, tannic acid, citric acid, oxalic acid or acetic acid.
4. The method for preparing a high-flux nanofiltration membrane according to claim 2, wherein the concentration of piperazine in the aqueous phase solution is 1-4% w/v, the concentration of the acidic additive is 0.1-2% w/v, and the temperature of the aqueous phase solution is 30-35 ℃.
5. The method as claimed in claim 1, wherein the organic phase solution in step S3 comprises trimesoyl chloride and an organic solvent.
6. The method for preparing a high-flux nanofiltration membrane according to claim 5, wherein the concentration of trimesoyl chloride in the organic phase solution is 0.05-2.5% w/v, and the temperature of the organic solvent is controlled at 40-50 ℃.
7. The method for preparing a high-flux nanofiltration membrane according to claim 4, wherein the organic solvent comprises one of n-hexane, ethylcyclohexane, ethylene oxide, n-dodecane and Isopar G or a mixture thereof in any proportion.
8. The method for preparing a high-flux nanofiltration membrane according to claim 1, wherein the alcoholic solvent in step S4 comprises one of methanol and ethanol or a mixture thereof in any proportion.
9. The method for preparing a high-flux nanofiltration membrane according to claim 1 or 8, wherein the concentration of the alcohol solvent is 0-15% w/v.
CN202111543111.3A 2021-12-16 2021-12-16 Preparation method of high-flux nanofiltration membrane Pending CN114146579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111543111.3A CN114146579A (en) 2021-12-16 2021-12-16 Preparation method of high-flux nanofiltration membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111543111.3A CN114146579A (en) 2021-12-16 2021-12-16 Preparation method of high-flux nanofiltration membrane

Publications (1)

Publication Number Publication Date
CN114146579A true CN114146579A (en) 2022-03-08

Family

ID=80451214

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111543111.3A Pending CN114146579A (en) 2021-12-16 2021-12-16 Preparation method of high-flux nanofiltration membrane

Country Status (1)

Country Link
CN (1) CN114146579A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115155341A (en) * 2022-07-15 2022-10-11 南昌航空大学 Antibacterial composite nanofiltration membrane and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888116A (en) * 1987-01-15 1989-12-19 The Dow Chemical Company Method of improving membrane properties via reaction of diazonium compounds or precursors
CN108939951A (en) * 2018-07-26 2018-12-07 浙江工业大学 A kind of self-assembled modified polyamide reverse osmosis composite film and its application
CN111437732A (en) * 2020-04-07 2020-07-24 蓝星（杭州）膜工业有限公司 Preparation method of high-selectivity high-flux nanofiltration membrane

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888116A (en) * 1987-01-15 1989-12-19 The Dow Chemical Company Method of improving membrane properties via reaction of diazonium compounds or precursors
CN108939951A (en) * 2018-07-26 2018-12-07 浙江工业大学 A kind of self-assembled modified polyamide reverse osmosis composite film and its application
CN111437732A (en) * 2020-04-07 2020-07-24 蓝星（杭州）膜工业有限公司 Preparation method of high-selectivity high-flux nanofiltration membrane

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JENNIFER SARAH LOUIE ET AL.: "Effects of surface coating process conditions on the water permeation and salt rejection properties of composite polyamide reverse osmosis membranes" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115155341A (en) * 2022-07-15 2022-10-11 南昌航空大学 Antibacterial composite nanofiltration membrane and preparation method thereof
CN115155341B (en) * 2022-07-15 2024-02-02 南昌航空大学 Antibacterial composite nanofiltration membrane and preparation method thereof

Similar Documents

Publication Publication Date Title
CN107158980B (en) Thin-layer composite membrane based on gas/liquid interface reaction and preparation method and application thereof
CN107837689B (en) Preparation method of composite nanofiltration membrane with ultrathin separation layer
CN105617882A (en) Chitosan modified graphene oxide nano composite positive osmotic membrane and preparation method thereof
WO2019179082A1 (en) Metal organic frame reverse osmosis membrane and preparation method therefor
CN104524984A (en) Preparation method of layer-by-layer self-assembling forward osmosis membrane and layer-by-layer self-assembling forward osmosis membrane prepared by method
CN104028110A (en) Thin-layer composite forward osmosis membrane and preparation method thereof
CN102008900A (en) Method for assembling multilayer composite separation membrane based on coordination effect
CN111659270A (en) Nanofiltration membrane, preparation method and application thereof
CN110201544B (en) High-flux high-selectivity nanofiltration membrane and preparation method thereof
CN112604507B (en) Preparation method of high-flux dye separation nanofiltration membrane
CN115414791B (en) Surface quaternization modified nanofiltration membrane, preparation and application of surface quaternization modified nanofiltration membrane in separation of magnesium and lithium in salt lake
CN113769593A (en) Nanofiltration membrane for extracting lithium from salt lake and preparation method thereof
CN106512729A (en) High-desalinization-rate reverse osmosis composite membrane and preparing method thereof
CN114146579A (en) Preparation method of high-flux nanofiltration membrane
CN114016285B (en) Preparation method of functional nanofiber membrane for sea water desalination
CN115554849A (en) Preparation method of polyethyleneimine-based positively-charged nanofiltration membrane
CN114887486A (en) Mannitol-based polyester loose composite nanofiltration membrane and preparation method and application thereof
CN113144912B (en) Preparation method of high-flux covalent organic framework nanofiltration membrane based on TFC structure
CN116143234A (en) Preparation method of sea water desalination reverse osmosis membrane and reverse osmosis membrane prepared by same
CN113731190A (en) Nano-cellulose layered self-assembled film and preparation method thereof
CN113522039A (en) Preparation method of forward osmosis membrane based on PVA (polyvinyl alcohol) grafting modification
CN109012232B (en) Preparation method of anti-shrinkage polytetrafluoroethylene composite nanofiltration membrane
CN115025620B (en) Nanofiltration membrane for extracting lithium from salt lake and production process thereof
CN112742221A (en) Forward osmosis membrane based on hydrophilic modified polyolefin microporous substrate and preparation method
CN111389226A (en) Permanent hydrophilic ultrafiltration membrane and preparation method thereof

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
RJ01 Rejection of invention patent application after publication

Application publication date: 20220308