CN113634141A - Preparation method of polyamide composite reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane - Google Patents
Preparation method of polyamide composite reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane Download PDFInfo
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- CN113634141A CN113634141A CN202010342586.5A CN202010342586A CN113634141A CN 113634141 A CN113634141 A CN 113634141A CN 202010342586 A CN202010342586 A CN 202010342586A CN 113634141 A CN113634141 A CN 113634141A
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- reverse osmosis
- osmosis membrane
- polyamide composite
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- chlorophyllin
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- 239000012528 membrane Substances 0.000 title claims abstract description 84
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 67
- 239000004952 Polyamide Substances 0.000 title claims abstract description 27
- 229920002647 polyamide Polymers 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229940099898 chlorophyllin Drugs 0.000 claims abstract description 26
- 235000019805 chlorophyllin Nutrition 0.000 claims abstract description 26
- 229920002492 poly(sulfone) Polymers 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 10
- 239000012074 organic phase Substances 0.000 claims abstract description 10
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012695 Interfacial polymerization Methods 0.000 claims abstract description 9
- 229940018564 m-phenylenediamine Drugs 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- UWCPYKQBIPYOLX-UHFFFAOYSA-N benzene-1,3,5-tricarbonyl chloride Chemical compound ClC(=O)C1=CC(C(Cl)=O)=CC(C(Cl)=O)=C1 UWCPYKQBIPYOLX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000008367 deionised water Substances 0.000 claims abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 6
- 239000012071 phase Substances 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 150000001335 aliphatic alkanes Chemical class 0.000 claims abstract description 5
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 5
- 229920000728 polyester Polymers 0.000 claims abstract description 5
- 238000007790 scraping Methods 0.000 claims abstract description 3
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 claims description 10
- HWDGVJUIHRPKFR-ZWPRWVNUSA-I copper;trisodium;3-[(2s,3s)-20-(carboxylatomethyl)-18-(dioxidomethylidene)-8-ethenyl-13-ethyl-3,7,12,17-tetramethyl-2,3-dihydroporphyrin-23-id-2-yl]propanoate Chemical compound [Na+].[Na+].[Na+].[Cu+2].C1=C([N-]2)C(CC)=C(C)C2=CC(C(=C2C)C=C)=NC2=CC([C@H]([C@@H]2CCC([O-])=O)C)=NC2=C(CC([O-])=O)C2=NC1=C(C)C2=C([O-])[O-] HWDGVJUIHRPKFR-ZWPRWVNUSA-I 0.000 claims description 7
- OOIOHEBTXPTBBE-UHFFFAOYSA-N [Na].[Fe] Chemical compound [Na].[Fe] OOIOHEBTXPTBBE-UHFFFAOYSA-N 0.000 claims description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 4
- KSHPUQQHKKJVIO-UHFFFAOYSA-N [Na].[Zn] Chemical compound [Na].[Zn] KSHPUQQHKKJVIO-UHFFFAOYSA-N 0.000 claims description 4
- 238000010612 desalination reaction Methods 0.000 claims description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 4
- CNPVJWYWYZMPDS-UHFFFAOYSA-N 2-methyldecane Chemical compound CCCCCCCCC(C)C CNPVJWYWYZMPDS-UHFFFAOYSA-N 0.000 claims description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- NSFSLUUZQIAOOX-LDCXZXNSSA-N pheophorbide a Chemical compound N1C(C=C2[C@H]([C@H](CCC(O)=O)C(=N2)C2=C3NC(=C4)C(C)=C3C(=O)[C@@H]2C(=O)OC)C)=C(C)C(C=C)=C1C=C1C(C)=C(CC)C4=N1 NSFSLUUZQIAOOX-LDCXZXNSSA-N 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 10
- 230000000845 anti-microbial effect Effects 0.000 abstract description 6
- 230000000844 anti-bacterial effect Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 230000001580 bacterial effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 244000005700 microbiome Species 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- RKEBXTALJSALNU-LDCXZXNSSA-N 3-[(3R,21S,22S)-16-ethenyl-11-ethyl-4-hydroxy-3-methoxycarbonyl-12,17,21,26-tetramethyl-7,23,24,25-tetrazahexacyclo[18.2.1.15,8.110,13.115,18.02,6]hexacosa-1,4,6,8(26),9,11,13(25),14,16,18(24),19-undecaen-22-yl]propanoic acid Chemical compound CCC1=C(C2=NC1=CC3=C(C4=C([C@@H](C(=C5[C@H]([C@@H](C(=CC6=NC(=C2)C(=C6C)C=C)N5)C)CCC(=O)O)C4=N3)C(=O)OC)O)C)C RKEBXTALJSALNU-LDCXZXNSSA-N 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 159000000000 sodium salts Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 239000004599 antimicrobial Substances 0.000 description 2
- 230000003385 bacteriostatic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- SIQZJFKTROUNPI-UHFFFAOYSA-N 1-(hydroxymethyl)-5,5-dimethylhydantoin Chemical compound CC1(C)N(CO)C(=O)NC1=O SIQZJFKTROUNPI-UHFFFAOYSA-N 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- JVOGSHDZLOJKKR-MXFMKSRJSA-I [Na+].[Na+].[Na+].[Mg++].CCc1c(C)c2cc3[n-]c(c(C)c3C=C)c(C)c3nc(C[C@H]3CCC([O-])=O)c(CC([O-])=O)c3[n-]c(cc1n2)c(C)c3C([O-])=O Chemical compound [Na+].[Na+].[Na+].[Mg++].CCc1c(C)c2cc3[n-]c(c(C)c3C=C)c(C)c3nc(C[C@H]3CCC([O-])=O)c(CC([O-])=O)c3[n-]c(cc1n2)c(C)c3C([O-])=O JVOGSHDZLOJKKR-MXFMKSRJSA-I 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000004113 cell culture Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- -1 halide amine compound Chemical class 0.000 description 1
- 150000001469 hydantoins Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
-
- 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
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- 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
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- 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
-
- 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/48—Antimicrobial properties
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a preparation method of a polyamide composite reverse osmosis membrane, the reverse osmosis membrane and application thereof, wherein the preparation method of the reverse osmosis membrane comprises the following steps: a. dissolving polysulfone in N, N-dimethylformamide to obtain a membrane casting solution, uniformly scraping the membrane casting solution on a polyester non-woven fabric, and curing and forming in water to obtain a polysulfone supporting layer; b. dissolving m-phenylenediamine and chlorophyllin in deionized water to prepare an aqueous solution; dissolving trimesoyl chloride in an alkane solvent to prepare an organic phase solution; c. and (3) contacting the polysulfone support layer with a water phase solution, removing the redundant water phase, contacting with an organic phase solution, and carrying out interfacial polymerization to form the polyamide composite reverse osmosis membrane. The reverse osmosis membrane prepared by the method has higher permeation flux and antimicrobial pollution performance.
Description
Technical Field
The invention relates to a reverse osmosis membrane, in particular to a preparation method of a polyamide composite reverse osmosis membrane, the reverse osmosis membrane and application thereof.
Background
The reverse osmosis membrane is used as the core of the reverse osmosis technology, determines the quality of produced water of a reverse osmosis system and plays an important role in system operation. In the actual industrial application process, a large amount of microorganisms exist in reverse osmosis inlet water, secretions of the microorganisms have high viscosity and are easily adsorbed on the surface of a membrane, the growth and reproduction rate of the microorganisms is high, and residual microorganisms can grow at an astonishing speed even if the microorganisms are cleaned by a chemical method, so that irreversible pollution of the reverse osmosis membrane is finally caused, the attenuation degree of selective permeability of the reverse osmosis membrane cannot be recovered, the water yield of a system is reduced, and the energy consumption is increased. Therefore, how to improve the anti-microbial pollution performance of the reverse osmosis membrane is the key point for reducing the energy consumption of the system.
The published literature relates to the following methods for improving the antibacterial ability of reverse osmosis membranes:
yang et al (Chemistry of Materials,2011,23(5): 1263-; wei et al (Journal of Membrane Science,2010,346(1): 152-) -162) graft a hydantoin derivative MDMH onto the surface of a reverse osmosis Membrane, and the halide amine compound formed after chlorination endows the Membrane with extremely strong antibacterial ability; in patent CN105561814B, attapulgite modified by chitosan quaternary ammonium salt is grafted on the surface of a reverse osmosis membrane, so that the antibacterial performance of the reverse osmosis membrane is improved; in patent CN102580579A, a polymer containing hydroxyl nano bactericidal particles is coated on the surface of a reverse osmosis membrane after high-temperature treatment, so that the antibacterial performance of the reverse osmosis membrane is improved; in patent CN101874989A, the surface of the reverse osmosis membrane is coated with a layer of nano inorganic antibacterial particles, so that the microbial pollution resistance of the reverse osmosis membrane is improved.
Although some technical solutions for preparing antibacterial reverse osmosis membranes have been formed in the prior art, most of membrane preparation methods are to prepare nascent reverse osmosis membranes first, and then graft substances with antibacterial properties on the membrane surface by a chemical grafting method or coat some antibacterial substances on the membrane surface to endow the reverse osmosis membranes with certain antibacterial properties, which is generally complicated and difficult to implement in industrial production, so that further attempts and optimization are still needed in the technology of preparing antibacterial reverse osmosis membranes.
Disclosure of Invention
The invention provides a preparation method of a polyamide composite reverse osmosis membrane, a reverse osmosis membrane and application thereof. The reverse osmosis membrane polyamide separation layer prepared by the method contains chlorophyllin, and abundant carboxyl of the chlorophyllin can react with m-phenylenediamine and trimesoyl chloride respectively, so that the crosslinking degree of the polyamide separation layer is reduced, the polyamide separation layer has larger aperture and higher free volume through a self flexible molecular chain, and the permeation flux is improved; more importantly, the metal ions rich in the chlorophyllin endows the reverse osmosis membrane with stronger antibacterial activity, improves the antibacterial performance after long-term use, and is beneficial to maintaining high permeation flux.
A preparation method of a polyamide composite reverse osmosis membrane comprises the following steps:
a. dissolving polysulfone in N, N-dimethylformamide to obtain a membrane casting solution, uniformly scraping the membrane casting solution on a polyester non-woven fabric, and curing and forming in water to obtain a polysulfone supporting layer;
b. dissolving m-phenylenediamine and chlorophyllin in deionized water to prepare an aqueous solution; dissolving trimesoyl chloride in an alkane solvent to prepare an organic phase solution;
c. and (3) contacting the polysulfone support layer with a water phase solution, removing the redundant water phase, contacting with an organic phase solution, and carrying out interfacial polymerization to form the polyamide composite reverse osmosis membrane.
Further, the chlorophyllin is one or more of sodium salt of chlorophyllin iron, sodium salt of copper chlorophyllin, sodium salt of zinc chlorophyllin and pheophorbide A.
Further, the alkane solvent is one or more of n-decane, heptane, n-hexane, cyclohexane, octane, isopar G and isopar L, and n-decane is further preferable.
Further, 15-17 wt% of polysulfone is solid-contained in the membrane casting solution, the curing and forming time in water is 5-60 s, preferably 10-30 s, and the thickness of the polysulfone supporting layer is 20-70 um, preferably 30-50 um.
Further, in the aqueous phase solution, the content of m-phenylenediamine is 1 to 10 wt%, preferably 1 to 6 wt%, and the content of chlorophyllin salt is 0.01 to 10 wt%, preferably 0.5 to 4 wt%.
Further, the content of trimesoyl chloride in the organic phase solution is 0.05-1 wt%, preferably 0.1-0.4 wt%.
Further, the contact time of the polysulfone support layer and the aqueous phase solution is 0.1-10 min, preferably 0.5-4 min, the temperature of interfacial polymerization is 20-50 ℃, preferably 25-40 ℃, and the reaction time is 0.1-6 min, preferably 0.5-2 min.
Further, the polyamide composite reverse osmosis membrane formed by interfacial polymerization is dried for 1-10 min, preferably 3-8 min at 50-120 ℃, preferably 60-90 ℃, and then is washed by deionized water to remove residual solvent.
The invention also provides the polyamide composite reverse osmosis membrane prepared by the method.
The polyamide composite reverse osmosis membrane prepared by the method is applied to the field of industrial brackish water desalination.
The reverse osmosis membrane prepared by the method has the following beneficial effects:
1) the reverse osmosis membrane provided by the invention is simple in preparation method, and excellent antimicrobial pollution performance can be obtained without post-treatment on the reverse osmosis membrane;
2) the reverse osmosis membrane provided by the invention has excellent antimicrobial pollution resistance and can maintain higher permeation flux: under the condition that the pressure is 1.55Mpa in the bitter test recognized in the industry, 2000ppm of sodium chloride is filtered, and the water flux reaches 60-80L/(m)2H), the desalination rate of sodium chloride reaches more than 99.3 percent, and the requirement of industrial brackish water desalination is met.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative of the invention and are not to be construed as limiting the scope of the invention.
The main raw material sources used in the examples of the present invention and the comparative examples are shown in table 1:
TABLE 1 sources of raw materials
| Name of raw materials | Specification and model | Manufacturer of the product |
| Polysulfone | P3500 LCD MB7 | Solvay Corp |
| N, N-dimethylformamide | The purity is 99.9 percent | Hualu constancy |
| Polyester non-woven fabric | Sanmu 74 | Mitsubishi paper company |
| M-phenylenediamine | The purity is 99.9 percent | Shanghai Oako Chemicals Ltd |
| Trimesoyl chloride | The purity is 99.9 percent | Qingdao Sanli bennuo New Material Co.,Ltd. |
| Chlorophyllin iron sodium salt | Purity of 99% | Wuhan Wanrong science and technology development Limited |
| Chlorophyllin copper sodium salt | Purity of 99% | Wuhan Wanrong science and technology development Limited |
| Chlorophyllin zinc sodium salt | Purity of 99% | Wuhan Wanrong science and technology development Limited |
| Pheophorbide A | Purity of 99% | Wuhan Wanrong science and technology development Limited |
Other starting materials or reagents are commercially available unless otherwise specified.
Performance evaluation parameters:
the osmotic flux is the volume of water flowing through the unit membrane surface per unit time and is expressed as L/(m)2·h)；
② the salt rejection is the concentration (C) of sodium chloride intercepted by reverse osmosis membraneP) With the concentration (C) of sodium chloride in the raw material liquidf) The ratio of (A) to (B):
controlling the concentration of sodium chloride in the feed water raw material solution to be 2000ppm, the pH of the solution to be 7 and the operating pressure to be 1.55 Mpa;
thirdly, evaluating the antimicrobial pollution performance of the reverse osmosis membrane by adopting a bacterial liquid oscillation method: cutting a reverse osmosis membrane into fragments of 10mm multiplied by 10mm by taking escherichia coli and staphylococcus aureus as microorganisms, putting the fragments into a wide-mouth bottle, and pouring 5mL of diluted bacterial liquid and 70mL of 0.03mol/L PBS solution. Another set of samples containing only the bacterial solution and PBS solution without any membrane sample was used as a blank control. And closing the opening of the wide-mouth bottle, and oscillating at 25 ℃ to ensure that the membrane sample is fully contacted with the bacterial liquid. After 24 hours, 100uL of the solution was sampled from the jar, diluted with PBS solution, and viable cell culture count was performed, and the bacteriostatic ratio (K) of the membrane sample was analyzed by comparing the bacterial solution concentration (No) of the blank control with the bacterial solution concentration (Nm) of the membrane sample:
[ example 1 ]
Dissolving polysulfone in N, N-dimethylformamide solution to prepare casting membrane solution (solid content is 17 wt%); uniformly coating the casting solution on a polyester non-woven fabric with the thickness of 90 mu m after vacuum defoaming, and curing in pure water at 25 ℃ for 30s to obtain a polysulfone supporting layer with the thickness of about 135-140 mu m;
immersing the polysulfone support layer in an aqueous solution at 25 ℃ for 30s, wherein the aqueous solution consists of 2.0 wt% of m-phenylenediamine and 0.02 wt% of chlorophyllin copper sodium salt. Taking out the polysulfone supporting layer, removing redundant aqueous phase solution on the surface of the polysulfone supporting layer by using a rubber roller, and then uniformly coating the organic phase solution on the surface of the polysulfone supporting layer, wherein the organic phase solution is 0.10 wt% of trimesoyl solution, the solvent is n-decane, the interfacial polymerization temperature is 35 ℃, and the interfacial polymerization reaction is 30 s; drying the reverse osmosis membrane for 3min by using a 60 ℃ blast drying oven, and finally washing by using deionized water.
[ examples 2 to 12 ]
A reverse osmosis membrane was prepared using the method of example 1, except for the raw material selection and parameter changes shown in table 2.
Comparative examples 1 to 4
A reverse osmosis membrane was prepared by the method of example 1 except that the aqueous solution contained no chlorophyllin and the feed parameters are as shown in table 2.
TABLE 2 control conditions of various parameters of examples and comparative examples
| Detailed description of the preferred embodiments | M-phenylenediamine/wt% | Chlorophyllin/wt% | Trimesoyl chloride/wt.% |
| Example 1 | 2.0 | Chlorophyllin copper sodium salt, 0.02 | 0.10 |
| Example 2 | 2.0 | Iron sodium salt of chlorophyllin, 0.5 | 0.20 |
| Example 3 | 2.0 | Chlorophyllin zinc sodium salt, 2.0 | 0.40 |
| Example 4 | 2.0 | Pheophorbide A, 4.0 | 0.60 |
| Example 5 | 4.0 | Chlorophyllin copper sodium salt, 1.0 | 0.10 |
| Example 6 | 4.0 | Iron sodium salt of chlorophyllin, 1.5 | 0.16 |
| Example 7 | 4.0 | Sodium salt of zinc chlorophyllin, 4.5 | 0.20 |
| Example 8 | 6.0 | Chlorophyllin copper sodium salt, 2.0 | 0.10 |
| Example 9 | 6.0 | Iron sodium salt of chlorophyllin, 3.5 | 0.16 |
| Example 10 | 6.0 | Chlorophyllin zinc sodium salt, 6.5 | 0.20 |
| Example 11 | 7.0 | Iron sodium salt of chlorophyllin, 5.0 | 0.05 |
| Example 12 | 7.0 | Chlorophyllin copper sodium salt, 7.5 | 0.10 |
| Comparative example 1 | 2.0 | - | 0.10 |
| Comparative example 2 | 4.0 | - | 0.16 |
| Comparative example 3 | 6.0 | - | 0.10 |
| Comparative example 4 | 7.0 | - | 0.05 |
The reverse osmosis membranes prepared in examples and comparative examples were tested for permeation flux, salt rejection and bacteriostatic ratio, and the test results are shown in table 3.
TABLE 3 test results of permeation flux, salt rejection and bacteriostasis
| Detailed description of the preferred embodiments | Permeation flux/L/(m)2·h) | Rate of salt removal/%) | Inhibition rate/%) |
| Example 1 | 67.45 | 99.38 | 80 |
| Example 2 | 68.34 | 99.34 | 84 |
| Example 3 | 76.42 | 99.30 | 88 |
| Example 4 | 65.43 | 99.31 | 87 |
| Example 5 | 60.45 | 99.40 | 88 |
| Example 6 | 80.64 | 99.30 | 89 |
| Example 7 | 67.34 | 99.38 | 90 |
| Example 8 | 60.56 | 99.35 | 88 |
| Example 9 | 61.43 | 99.45 | 89 |
| Example 10 | 63.45 | 99.40 | 91 |
| Example 11 | 62.63 | 99.38 | 90 |
| Example 12 | 60.43 | 99.31 | 93 |
| Comparative example 1 | 50.32 | 99.49 | 0 |
| Comparative example 2 | 55.45 | 99.53 | 0 |
| Comparative example 3 | 42.72 | 99.52 | 0 |
| Comparative example 4 | 40.23 | 99.55 | 0 |
As shown in the test results in Table 3, the reverse osmosis membrane prepared by adding the chlorophyllin to the polyamide separation layer has better anti-microbial pollution performance, and can maintain higher permeation flux and salt rejection rate.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the polyamide composite reverse osmosis membrane is characterized by comprising the following steps of:
a. dissolving polysulfone in N, N-dimethylformamide to obtain a membrane casting solution, uniformly scraping the membrane casting solution on a polyester non-woven fabric, and curing and forming in water to obtain a polysulfone supporting layer;
b. dissolving m-phenylenediamine and chlorophyllin in deionized water to prepare an aqueous solution; dissolving trimesoyl chloride in an alkane solvent to prepare an organic phase solution;
c. and (3) contacting the polysulfone support layer with a water phase solution, removing the redundant water phase, contacting with an organic phase solution, and carrying out interfacial polymerization to form the polyamide composite reverse osmosis membrane.
2. The method for preparing a polyamide composite reverse osmosis membrane according to claim 1, wherein the chlorophyllin is one or more of iron sodium chlorophyllin, copper sodium chlorophyllin, zinc sodium chlorophyllin, and pheophorbide A.
3. The method for producing a polyamide composite reverse osmosis membrane according to claim 1 or 2, characterized in that the alkane solvent is one or more of n-decane, heptane, n-hexane, cyclohexane, octane, isopar G and isopar L, and further preferably n-decane.
4. The preparation method of the polyamide composite reverse osmosis membrane according to claim 1, characterized in that 15-17 wt% of polysulfone is solid contained in the membrane casting solution, the curing and forming time in water is 5-60 s, preferably 10-30 s, and the thickness of the polysulfone support layer is 20-70 um, preferably 30-50 um.
5. The method for preparing a polyamide composite reverse osmosis membrane according to claim 1, wherein the aqueous solution contains m-phenylenediamine in an amount of 1 to 10 wt%, preferably 1 to 6 wt%, and chlorophyllin in an amount of 0.01 to 10 wt%, preferably 0.5 to 4 wt%.
6. The method for preparing a polyamide composite reverse osmosis membrane according to claim 5, wherein the organic phase solution contains trimesoyl chloride in an amount of 0.05 to 1 wt%, preferably 0.1 to 0.4 wt%.
7. The method for preparing a polyamide composite reverse osmosis membrane according to any one of claims 1 to 6, wherein the contact time of the polysulfone support layer and the aqueous solution is 0.1 to 10min, preferably 0.5 to 4 min; the temperature of the interfacial polymerization reaction is 20-50 ℃, preferably 25-40 ℃, and the reaction time is 0.1-6 min, preferably 0.5-2 min.
8. The preparation method of the polyamide composite reverse osmosis membrane according to claim 1, wherein the polyamide composite reverse osmosis membrane formed by interfacial polymerization is dried at 50-120 ℃, preferably at 60-90 ℃ for 1-10 min, preferably 3-8 min, and then washed with deionized water.
9. A polyamide composite reverse osmosis membrane prepared according to the method of claims 1-8.
10. A polyamide composite reverse osmosis membrane prepared by the method of claims 1-8 or a reverse osmosis membrane according to claim 9, which is used in the field of industrial brackish water desalination.
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