CN114225699B - Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF - Google Patents

Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF Download PDF

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CN114225699B
CN114225699B CN202111528653.3A CN202111528653A CN114225699B CN 114225699 B CN114225699 B CN 114225699B CN 202111528653 A CN202111528653 A CN 202111528653A CN 114225699 B CN114225699 B CN 114225699B
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membrane
zif
nanofiltration membrane
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layer
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CN114225699A (en
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薛立新
王庆一
陆叶强
张秀敏
马俊梅
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Zhejiang University of Technology ZJUT
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    • 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
    • B01D67/0002—Organic membrane manufacture
    • 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
    • B01D67/0006—Organic membrane manufacture by chemical reactions
    • 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
    • B01D71/06—Organic material
    • B01D71/26—Polyalkenes
    • 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
    • B01D71/56—Polyamides, e.g. polyester-amides
    • 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

Abstract

The invention discloses a method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth, which uses a single-layer polyolefin porous membrane to replace a traditional polyester non-woven fabric and polysulfone ultrafiltration layer two-layer structure as a supporting layer, can greatly reduce the thickness and preparation cost of the membrane, and adopts reverse phase interfacial polymerization in-situ growth ZIF nanoparticles to improve the performance of a polyamide separation layer in the interfacial polymerization process, wherein the ZIF nanoparticles can provide a special water channel, and can improve the water flux of the nanofiltration membrane under the condition of not losing the salt interception rate; the nanofiltration membrane prepared by the invention has higher water flux and good salt interception rate, and is mainly applied to the fields of water treatment, sea water desalination, sewage treatment, dye purification and the like.

Description

Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF
Technical Field
The invention relates to the field of nanofiltration membranes, in particular to a method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF.
Background
Nanofiltration membranes have been rapidly developed after the 80 s, and most of the traditional nanofiltration membranes adopt ultrafiltration membranes as supporting layers. Such ultrafiltration membranes are often composed of two layers: one layer is polyester non-woven fabric; one layer is a polyacrylonitrile, polysulfone, polyethersulfone, polyvinylidene fluoride and polyvinyl chloride ultrafilter layer. And then performing interfacial polymerization on the ultrafiltration membrane to attach a polyamide separation layer. Conventional nanofiltration membrane preparation has many problems such as cost, process, quality, etc. The polyester non-woven fabric and the ultrafiltration layer coated on the polyester non-woven fabric occupy 60% -70% of the cost of the nanofiltration membrane, however, the polyester non-woven fabric in China cannot produce qualified products at present in China, so that the non-woven fabric in China is seriously dependent on foreign import, and the ultrafiltration layer such as polysulfone is also dependent on foreign import. The preparation process of the ultrafiltration membrane is complicated in two-layer preparation, a large amount of organic solvents are required to be consumed, and the environment is not good. In terms of quality, the polyamide layer is not firmly combined, the mechanical property is poor, and the polyamide layer is easy to fall off. So new ways must be opened up in China to find new materials so as to reduce the production cost of nanofiltration membranes in China and improve the economic benefit.
Polyolefin is widely used in lithium battery separators due to its inexpensive characteristics. The thickness is 5-50 μm, and the average pore diameter is 10-70nm. The polyolefin porous membrane replaces the traditional two layers of ultrafiltration membranes, so that the production cost can be greatly reduced, and the continuous production is facilitated. In order to break the trade-off phenomenon between the inherent water flux and the salt interception rate of the nanofiltration membrane, some ZIF nanoparticles are attached to the polyamide layer, and a special fixed water channel is provided by the ZIF nanoparticles, so that the water flux of the nanofiltration membrane is improved while the salt interception rate is not lost. However, the bonding force between the ZIF and the polyamide layer is a difficulty in solving this problem. The conventional method is to synthesize corresponding nanoparticles in advance, and disperse the nanoparticles in an aqueous phase or an organic phase during interfacial polymerization. The doped nano particles are not firmly combined with the polyamide layer and are very easy to fall off, and meanwhile, a large amount of ZIF nano particles can be agglomerated, so that the salt interception rate of the nanofiltration membrane is reduced.
According to the invention, through inverse interfacial polymerization, a water-phase diamine monomer is arranged on the surface layer of the membrane, metal ions can be coordinated and complexed with amino groups in the diamine monomer at the defect of the polyamide layer, the metal ions can be well combined on the polyamide layer, and then the metal ions continue to coordinate with imidazole ligands to generate corresponding ZIF nanoparticles, such as ZIF-8, ZIF-67 and the like, so that the defect of the polyamide layer can be repaired through the ZIF nanoparticles, the salt rejection rate of the nanofiltration membrane is improved, and meanwhile, the ZIF nanoparticles are combined on the polyamide separation layer through coordination bonds.
Disclosure of Invention
Aiming at the existing problems, the invention provides a method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF, and the ZIF nanoparticles are grown by adopting reverse phase interfacial polymerization.
The technical scheme of the invention is as follows:
a method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF, comprising the following steps:
(1) Contacting one side of the polyolefin porous base film with an organic phase monomer solution for 0.1-15 min, and then airing for standby;
the polyolefin porous bottom film is made of the following materials: homopolymers of an olefin such as polyethylene, polypropylene and other olefins or copolymers of a plurality of olefins;
the organic phase monomer is selected from the group consisting of: one or more of trimesoyl chloride, 1,2, 3-trimesoyl chloride, terephthaloyl chloride, isophthaloyl chloride, adipoyl chloride, oxalyl chloride; the mass fraction of the organic phase monomer solution is 0.01-2 wt%, and the solvent is n-hexane;
(2) Contacting one surface of the film obtained in the step (1) contacted with the organic phase monomer solution with the aqueous phase monomer solution for 0.1-15 min, and then airing for standby;
the aqueous monomer is selected from: one or more of o-phenylenediamine, diethylamine, m-phenylenediamine, p-phenylenediamine, piperazine, diethylenetriamine and triethylenetetramine; the mass fraction of the aqueous monomer solution is 0.01-10wt% and the solvent is deionized water;
(3) Contacting one surface of the film obtained in the step (2) contacted with the aqueous monomer solution with the ZIF precursor metal salt solution for 0.1-15 min, and then drying for later use;
the ZIF precursor metal salt is selected from: one or more of zinc nitrate hexahydrate, cobalt nitrate hexahydrate, copper nitrate trihydrate, cadmium nitrate tetrahydrate, zinc oxalate dihydrate; the mass fraction of the ZIF precursor metal salt solution is 0.01-10wt% and the solvent is deionized water;
the temperature of the drying is 40-90 ℃ and the time is 5-30 min;
(4) Soaking the membrane obtained in the step (3) in methanol solution of imidazole ligand for 0.05-48 h, then taking out, cleaning with methanol, and storing in water;
the imidazole ligand is selected from one or more of 2-methylimidazole, benzimidazole, imidazole-2-formaldehyde, 2-aminobenzimidazole and 2-hydroxyimidazole; the mass fraction of the methanol solution of the imidazole ligand is 0.1-10wt%.
The nanofiltration membrane prepared by the method comprises the following components: a polyolefin porous support layer, a polyamide dense skin layer and grown ZIF nanoparticles;
the thickness of the polyolefin porous supporting layer is 5-60 mu m, the aperture is 10-70nm, and the porosity is 20-80%;
the thickness of the polyamide compact skin layer is 50-700 nm;
the ZIF nanoparticle includes: ZIF-7, ZIF-8, ZIF-9, ZIF-10, ZIF-11, ZIF-12, ZIF-14, ZIF-20, ZIF-23, ZIF-67, ZIF-90; the diameter of the ZIF nano particles is 20-300 nm; the ZIF nanoparticle shape includes: spheres, tetrahedrons, hexahedrons, octahedrons, dodecahedrons.
The invention has the beneficial effects that:
the invention provides a method for preparing a nanofiltration membrane based on in-situ growth ZIF of a polyolefin composite polyamide membrane, which uses a single-layer polyolefin porous membrane to replace a traditional two-layer structure of a polyester non-woven fabric and a polysulfone ultrafiltration layer as a supporting layer, and can greatly reduce the thickness of the membrane and the preparation cost. According to the invention, the ZIF nanoparticles are grown in situ to improve the performance of the polyamide separation layer in the interfacial polymerization process, and the ZIF nanoparticles can provide a special water channel, so that the water flux of the nanofiltration membrane is improved under the condition of not losing the salt interception rate.
The nanofiltration membrane prepared by the invention has higher water flux and good salt interception rate, and is mainly applied to the fields of water treatment, sea water desalination, sewage treatment, dye purification and the like.
Drawings
Fig. 1: a flow chart for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF (taking a nanofiltration membrane based on polyethylene porous base membrane in-situ growth ZIF-8 as an example).
Fig. 2: the structure of the nanofiltration membrane prepared by in-situ growth ZIF based on polyolefin composite polyamide membrane is schematically shown.
Fig. 3: nanofiltration membrane scanning electron microscope pictures prepared based on polyolefin composite polyamide membrane in-situ growth ZIF-8.
Fig. 4: nanofiltration membrane scanning electron microscope pictures prepared based on polyolefin composite polyamide membrane in-situ growth ZIF-67.
Fig. 5: nanofiltration membrane scanning electron microscope pictures prepared based on non-grown ZIF of polyolefin composite polyamide membranes.
Detailed Description
The method for preparing the nanofiltration membrane based on the polyolefin composite polyamide membrane in-situ growth ZIF according to the present invention is further described below by way of examples and comparative examples. It should be understood that the following examples and comparative examples are given by way of illustration only and are not intended to limit the scope of the present invention, and that obvious variations and modifications made by those skilled in the art in light of the present invention are included within the scope of the present invention.
The polyethylene porous membrane used in the examples was a polyethylene corona membrane purchased from Shanghai Enjetsche New Material science and technology Co., ltd., specification model: HS16, SV9.
Example 1
(1) Taking a polyethylene porous membrane with the thickness of 9 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 0.594g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Zn (NO) 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
A polyethylene-based nanofiltration membrane prepared in example 1 had a thickness of 9.+ -. 1um, the nanofiltration membrane prepared in this example was put into a performance evaluation device, experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 78.4 L.m -2 ·h -1 Interception: 98.2%.
Example 2
(1) Taking a polyethylene porous membrane with the thickness of 9 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 1.188g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Zn (NO) 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 2 was 9±1um, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 86.5 L.m -2 ·h -1 Interception: 95.1%.
Example 3
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 1.782g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed withZn(NO 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 3 was 16±1um, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 55.0 L.m -2 ·h -1 Interception: 93.6%.
Example 4
(1) Taking a polyethylene porous membrane with the thickness of 9 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 2.97g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Zn (NO) 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 4 was 9.+ -.1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 87.5 L.m -2 ·h -1 Interception: 95.9%.
Example 5
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 1.782g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Zn (NO) 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 0.1642g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 5 was 16.+ -.1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 52.9 L.m -2 ·h -1 Interception: 91.3%.
Example 6
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 1.782g Zn (NO) was weighed out 3 )·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Zn (NO) 3 )·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 0.492g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 6 was 16.+ -. 1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation deviceIn (3), experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 48.9 L.m -2 ·h -1 Interception: 90.6%.
Example 7
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 0.582g of Co (NO) 3 ) 2 ·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Co (NO) 3 ) 2 ·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 7 was 16.+ -.1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 62.1 L.m -2 ·h -1 Interception: 94.9%.
Example 8
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 1.164g Co (NO) was weighed out 3 ) 2 ·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Co (NO) 3 ) 2 ·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 8 was 16.+ -.1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 68.2 L.m -2 ·h -1 Interception: 95.4%.
Example 9
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) Weigh 2.91g Co (NO) 3 ) 2 ·6H 2 O is dissolved in 100mL deionized water, and the membrane obtained in the step (2) is mixed with Co (NO) 3 ) 2 ·6H 2 After the O solution is contacted for 1min, the mixture is baked in an oven at 60 ℃ for 15min.
(4) 1.48g of 2-methylimidazole is weighed and dissolved in 150mL of methanol, the membrane obtained in the step (3) is soaked in the solution for 1h, and then the membrane is taken out, washed by methanol and stored in a wetting agent to be tested.
The thickness of a polyethylene-based nanofiltration membrane prepared in example 9 was 16.+ -.1. Mu.m, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 76.4 L.m -2 ·h -1 Interception: 92.7%.
Comparative example
(1) Taking a polyethylene porous membrane with the thickness of 16 mu m as a supporting layer, weighing 0.075g of trimesoyl chloride, dissolving in 100mL of normal hexane, contacting one side of the polyethylene porous base membrane with the trimesoyl chloride solution for 4min, and then airing to form an organic phase layer.
(2) 0.1g of piperazine is weighed and dissolved in 100mL of deionized water, and one surface of the film obtained in the step (1) contacted with the organic phase is contacted with the aqueous phase monomer for 1min and then dried.
(3) 0g of 2-methylimidazole was weighed and dissolved in 150mL of methanol, and the membrane obtained in step (2) was immersed in the solution for 1 hour, and then taken out for testing.
The thickness of a polyethylene nanofiltration membrane prepared in comparative example was 16±1um, and the nanofiltration membrane prepared in this example was put into a performance evaluation device under experimental conditions: 0.6Mpa, 1h prepressing, 1000ppm sodium sulfate concentration, experimental result: water flux: 44.8 L.m -2 ·h -1 Interception: 96.6%.
Table 1 shows the water flux, na, of nanofiltration membranes of examples and comparative examples of the present invention 2 SO 4 Rejection rate.
TABLE 1 Water flux, na of nanofiltration membranes 2 SO 4 Retention rate of
Note that: nanofiltration membrane performance test conditions: the temperature is 25 ℃ and the pressure is 0.6MPa.

Claims (3)

1. A method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF, which is characterized by comprising the following steps:
(1) Contacting one side of a polyolefin porous base film with an organic phase monomer solution for 0.1-15 min, and then airing for later use;
the organic phase monomer is selected from the group consisting of: one or more of trimesoyl chloride, 1,2, 3-trimesoyl chloride, terephthaloyl chloride, isophthaloyl chloride, adipoyl chloride, oxalyl chloride; the mass fraction of the organic phase monomer solution is 0.01-2wt% and the solvent is n-hexane;
(2) Contacting one surface of the film obtained in the step (1) contacted with the organic phase monomer solution with the aqueous phase monomer solution for 0.1-15 min, and then airing for later use;
the aqueous monomer is selected from: one or more of o-phenylenediamine, diethylamine, m-phenylenediamine, p-phenylenediamine, piperazine, diethylenetriamine and triethylenetetramine; the mass fraction of the aqueous phase monomer solution is 0.01-10wt% and the solvent is deionized water;
(3) Contacting one surface of the film obtained in the step (2) contacted with the aqueous monomer solution with the ZIF precursor metal salt solution for 0.1-15 min, and then drying for later use;
the ZIF precursor metal salt is selected from: one or more of zinc nitrate hexahydrate, cobalt nitrate hexahydrate, copper nitrate trihydrate, cadmium nitrate tetrahydrate, zinc oxalate dihydrate; the mass fraction of the ZIF precursor metal salt solution is 0.01-10wt% and the solvent is deionized water;
(4) Soaking the membrane obtained in the step (3) in methanol solution of imidazole ligand for 0.05-48 h, taking out, cleaning with methanol, and storing in water;
the imidazole ligand is selected from one or more of 2-methylimidazole, benzimidazole, imidazole-2-formaldehyde, 2-aminobenzimidazole and 2-hydroxyimidazole.
2. The method for preparing the nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF according to claim 1, wherein in the step (3), the drying temperature is 40-90 ℃ and the time is 5-30 min.
3. The method for preparing a nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF according to claim 1, wherein in the step (4), the mass fraction of the methanol solution of imidazole ligand is 0.1-10wt%.
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