CN107349807B - Fe (BTC) -inlaid large-flux polyamide nano composite film and preparation method and application thereof - Google Patents
Fe (BTC) -inlaid large-flux polyamide nano composite film and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of a Fe (BTC) -inlaid large-flux polyamide nano composite film, which comprises the following steps: dissolving a raw material ultrafiltration membrane into an N, N-dimethylformamide solvent, stirring at room temperature to obtain a membrane casting solution, and forming a membrane to obtain a PSF (polymer dispersed fiber) support membrane; dissolving m-phenylenediamine in deionized water to obtain a 0.1-8 wt% m-phenylenediamine aqueous phase solution, and dissolving trimesoyl chloride in n-hexane to obtain a trimesoyl chloride organic phase solution; uniformly dropwise adding the m-phenylenediamine aqueous phase solution on the PSF support membrane, and continuously and uniformly dropwise adding the trimesoyl chloride organic phase solution on the PSF support membrane treated by the aqueous phase solution to obtain a polyamide membrane; immersing the obtained polyamide membrane in a mixed solution of a ferric iron compound, water and ethanol, and then immersing the treated membrane in a mixed solution of trimesic acid, water and ethanol to obtain an Fe (BTC)/PA membrane; the membrane prepared by the invention has high selectivity and high flux separation performance.
Description
Technical Field
The invention particularly relates to a polyamide reverse osmosis membrane based on metal organic framework material mosaic, and a preparation method and application thereof.
Background
Reverse osmosis is a membrane separation process taking differential pressure as a driving force, and has the characteristics of no phase change, high selectivity, high efficiency, low energy consumption and the like in the separation process.
Polyamide is a kind of high molecular material commonly used for preparing composite membrane skin, and has good stability, hydrophilicity and mechanical strength, and can resist high temperature, strong alkali and organic solvent. Currently, aromatic polyamides are widely used in commercial nanofiltration and reverse osmosis membranes, and such membranes have been widely used in industries including water treatment, solution decolorization, drug concentration and purification, and biochemical substance concentration. Although the energy utilization rate of the existing large-scale water treatment is continuously improved, the problem of energy consumption is always the main problem in the field of desalination, the water flux is improved, and the required pressure is reduced, so that the energy consumption is the most main means at the present stage.
The metal-organic framework material is a porous material newly discovered in recent years, and has nanometer-sized pore channels or pores, and the types of the pore channels are complex and various; the composite material has the advantages of high porosity, large specific surface area, small density, good chemical stability and controllable pore structure. The metal-organic framework material with the nanoscale pore channel shows excellent gas/liquid adsorption selectivity, so that the metal-organic framework material is developed into a gas separation membrane or pervaporation membrane material with excellent performance; in addition, the metal-organic framework material can improve the desalination of the nanofiltration membrane and provide additional nano channels, and the permeability of the nanofiltration membrane is improved under the condition of not influencing the rejection rate. Fe (BTC) is a tricarboxylic acid polymer of Fe (III) and terephthalic acid, and has high specific surface area, water stability and thermal stability.
The Fe (BTC)/PA composite membrane is prepared by the traditional method. Firstly, Fe (BTC) nano particles are synthesized and then doped into a polyamide layer to obtain the Fe (BTC)/PA composite membrane. Although the performance of the compared polyamide composite membrane has been obviously improved, in the process of incorporating the MOF nano-particles into the polyamide membrane, the agglomeration of the nano-particles in the interior of the polyamide membrane and the generation of non-selective pores are easily caused, thereby leading to the reduction of the membrane performance.
Disclosure of Invention
Aiming at the low permeability of the aromatic polyamide membrane, the invention aims to prepare the Fe (BTC) -inlaid polyamide nano composite membrane by using the structural characteristics of the Fe (BTC) metal organic framework material and adopting an in-situ synthesis method, thereby realizing the aim of preparing the polyamide membrane with high flux and high rejection rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the Fe (BTC) -inlaid polyamide nano composite film can be prepared according to the following steps:
(1) dissolving a raw material ultrafiltration membrane into an N, N-dimethylformamide solvent, stirring at room temperature to obtain a membrane casting solution, ultrasonically standing the membrane casting solution for 20-40 h to remove bubbles in the solution, laying the membrane casting solution on a smooth glass plate at 20-50 ℃, and scraping by using a scraper to form to obtain a PSF (pressure sensitive filter) support membrane; the adding amount of the N, N-dimethylformamide solvent is 5-10 ml/g based on the mass of the ultrafiltration membrane;
(2) dissolving m-phenylenediamine in deionized water to obtain a 0.1-8 wt% m-phenylenediamine aqueous phase solution, dissolving trimesoyl chloride in n-hexane, and performing ultrasonic treatment for 30-60 min to obtain a trimesoyl chloride organic phase solution; uniformly dropwise adding the m-phenylenediamine aqueous phase solution onto the PSF support membrane, standing for 2-8 min, removing redundant aqueous phase solution, further uniformly adding the trimesoyl chloride organic phase solution onto the PSF support membrane treated by the aqueous phase solution, standing for 2-8 min, removing redundant organic phase solution, standing for 2-10 min to obtain a treated membrane, and drying the treated membrane at 40-60 ℃ for 5-15 min to obtain a polyamide membrane; the amount of the trimesoyl chloride substance is 100-700 mmol/L in terms of the volume of n-hexane; the addition amount of the m-phenylenediamine aqueous phase solution is 0.7-1.4 ml/cm based on the area of the PSF support membrane2(ii) a The addition of the trimesoyl chloride organic phase solution is 0.7-1.4 ml/cm based on the area of the PSF supporting membrane2；
(3) Dissolving a ferric iron compound in a mixed solution of water and ethanol to obtain a reaction solution A, dissolving trimesic acid in a mixed solution of water and ethanol to obtain a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 20-40 h, immersing the treated membrane in the reaction solution B, reacting at 60-80 ℃ for 12-24 h, and standing the obtained product in deionized water for 24h to obtain an Fe (BTC)/PA membrane; the amount of the ferric iron compound is 100-700 mmol/L based on the total volume of a mixed solution of water and ethanol; the amount of the trimesic acid is 100-700 mmol/L based on the total volume of the mixed solution of water and ethanol.
Further, in the step (1), the ultrafiltration membrane is polysulfone, polyethersulfone, polyethylene or polypropylene, preferably polysulfone.
Further, in the step (1), the frequency of the ultrasonic defoaming is 30-50 KHz, and the time is 0.2-3 h.
Further, in the step (1), the thickness of the PSF supporting film is 100-300 μm.
Further, in the step (3), the ferric iron compound is: ferric chloride, ferric nitrate or ferric sulphate.
Further, in the step (3), the volume ratio of the deionized water to the ethanol is 1: 1-10; still more preferably 1: 1.
Further, in the step (3), the reaction temperature is preferably 60 ℃ and the reaction time is preferably 40 hours.
The Fe (BTC) -inlaid polyamide nano-composite membrane is applied to a desalting process.
Compared with the prior art, the invention has the advantages that:
the method of the invention utilizes the existing carboxyl group and Fe in the polyamide layer3+The coordination of the composite membrane provides uniform and dispersed coordination sites for the subsequent synthesis of Fe (BTC) particles, the Fe (BTC) -inlaid polyamide nano composite membrane is successfully prepared, the dispersibility and compatibility of the synthesized membrane are well improved, and the composite membrane has high selectivity and high flux separation performance.
Drawings
FIG. 1 is a scanning electron microscope surface and cross-sectional view of the Fe (BTC) inlaid polyamide nanocomposite film of example 1;
FIG. 2 is a surface and cross-sectional view of a polyamide film in a comparative example under a scanning electron microscope.
Detailed Description
The present invention will be described in detail below with reference to specific examples, but the present invention is not limited to the following examples, and various modifications and implementations are included within the technical scope of the present invention without departing from the content and scope of the present invention.
The separation performance test of the Fe (BTC) inlaid polyamide nano composite membrane can be carried out according to the following steps:
the reverse osmosis separation performance of the Fe (BTC) -inlaid polyamide nano composite membrane separation aqueous solution system is measured by adopting a flat membrane performance testing device: the feed liquid is NaCl with the concentration of 2000ppm and MgSO 2000ppm4，2000ppm Na2SO4，2000ppm CaCl22000ppm KCl, 25 deg.C and 0.2MPa, 0.4MPa, 0.6MPa and 0.8MPa respectively.
Evaluation of nanofiltration separation Performance, i.e. testing of Membrane flux and rejection
1) The permeate flux (J), which is an index reflecting the permeability of the membrane, is defined by the formula:
J＝V/(S*t*P)
j stands for flux (L m)-2h-1bar-1) S represents the effective area (m) of the film-2) T represents time (h) and P represents pressure (bar).
2) The rejection (R), reflecting the selectivity of the membrane, is defined by the formula:
R＝(Cf–Cp)/Cf100％
in the formula, CfAnd CpThe concentrations of solute components in the feed solution and permeate, respectively.
Example 1
(1) Dissolving polysulfone 5mg into 20ml N, N-dimethylformamide solvent to obtain casting solution, ultrasonic standing for 12 hr for 20min, and spreading the casting solution at 50 deg.C in 100cm smooth surface2Scraping the glass plate with a 200 μm scraper to form a film, immediately adding the film into water, and completely shaping to obtain the final productAnd putting the PSF support film into deionized water for standby.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of the m-phenylenediamine aqueous phase solution is uniformly dripped into 7.065cm of the PSF supporting film2Standing for 2min, removing redundant aqueous phase solution, continuously and uniformly dripping 5ml of trimesoyl chloride organic phase solution on a PSF (pressure sensitive adhesive) support membrane treated by the aqueous phase solution, standing for 2min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
(3) dissolving 0.972g of ferric trichloride in water and ethanol in a volume ratio of 1:1, adding the obtained polyamide membrane into the mixed solution, and standing for 20 hours at room temperature; dissolving 2.52g of trimesic acid in water and ethanol in a volume ratio of 1:1, then adding a polyamide membrane, reacting at 60 ℃ for 12 hours, and placing the obtained product in deionized water to obtain an Fe (BTC)/PA membrane.
Carrying out performance test on the obtained Fe (BTC)/PA membrane; the surface analysis of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane is carried out, as shown in figure 1, the retention rate of the composite membrane to 2000ppm NaCl under 0.6MPa is 92.55%, and the water flux reaches 5.662L m percent-2h-1bar-1。
Example 2
(1) Dissolving polysulfone 5mg into 20ml N, N-dimethylformamide solvent to obtain casting solution, ultrasonic standing for 12 hr for 20min, and spreading the casting solution at 50 deg.C in 100cm smooth surface2And (3) scraping the glass plate to form a film by using a 200-micron scraper, then immediately and quickly putting the obtained film into water, and after the film is completely formed, putting the obtained PSF support film into deionized water for later use.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of metaphenylene diamine aqueous phase solution is uniformly dripped into the PSF branchSupporting film 7.065cm2Standing for 2min, removing redundant aqueous phase solution, continuously and uniformly dripping 5ml of trimesoyl chloride organic phase solution on a PSF (pressure sensitive adhesive) support membrane treated by the aqueous phase solution, standing for 2min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
(3) 6.804g of ferric chloride is dissolved in water and ethanol in a volume ratio of 1:1 to prepare a reaction solution a, and 17.651g of trimesic acid was dissolved in a volume ratio of water to ethanol of 1:1 to prepare a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 40h, then immersing the treated membrane in the reaction solution B again, reacting at 80 ℃ for 12h, and putting the obtained product in deionized water to obtain the Fe (BTC)/PA membrane.
Carrying out performance test on the obtained Fe (BTC)/PA membrane; the surface analysis of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane and the surface analysis of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane show that the surface appearance of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane in the example 1 is not greatly different, the rejection rate of 2000ppm NaCl under 0.6MPa is 93.85 percent, and the water flux reaches 5.214L m percent-2h-1bar-1。
Example 3
(1) Dissolving polyethylene 5mg into 20ml N, N-dimethylformamide solvent to obtain casting solution, ultrasonic standing for 12 hr for 20min, and spreading the casting solution at 50 deg.C in 100cm smooth surface2And (3) scraping the glass plate to form a film by using a 200-micron scraper, then immediately and quickly putting the obtained film into water, and after the film is completely formed, putting the obtained PSF support film into deionized water for later use.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of the m-phenylenediamine aqueous phase solution is uniformly dripped into 7.065cm of the PSF supporting film2Standing for 2min to remove excessiveTaking 5ml of trimesoyl chloride organic phase solution, continuously and uniformly dropwise adding the trimesoyl chloride organic phase solution on a PSF support membrane treated by the aqueous phase solution, standing for 2min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
(3) 6.804g of ferric chloride is dissolved in water and ethanol in a volume ratio of 1:1 to prepare a reaction solution a, and 17.651g of trimesic acid was dissolved in a volume ratio of water to ethanol of 1:1 to prepare a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 40h, then immersing the treated membrane in the reaction solution B again, reacting at 60 ℃ for 12h, and putting the obtained product in deionized water to obtain the Fe (BTC)/PA membrane.
Carrying out performance test on the obtained Fe (BTC)/PA membrane; the surface analysis of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane and the surface analysis of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane show that the surface appearance of the Fe (BTC) type metal organic framework material/polyamide nano composite membrane in the example 1 is not greatly different, the rejection rate of the composite membrane to 2000ppm NaCl under 0.6MPa is 93.21%, and the water flux reaches 5.354L m-2h-1bar-1。
Example 4
(1) Dissolving polyethersulfone 5mg in N, N-dimethylformamide 20ml to obtain casting solution, ultrasonic standing for 12h for 20min, and spreading the casting solution at 50 deg.C in 100cm2And (3) scraping the glass plate to form a film by using a 200-micron scraper, then immediately and quickly putting the obtained film into water, and after the film is completely formed, putting the obtained PSF support film into deionized water for later use.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of the m-phenylenediamine aqueous phase solution is uniformly dripped into 7.065cm of the PSF supporting film2Standing for 8min, removing excessive water phase solution, and dissolving with the trimesoyl chloride organic phaseContinuously and uniformly dripping 5ml of the solution on a PSF support membrane treated by the aqueous phase solution, standing for 8min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
(3) 6.804g of ferric chloride is dissolved in water and ethanol in a volume ratio of 1:1 to prepare a reaction solution a, and 17.651g of trimesic acid was dissolved in a volume ratio of water to ethanol of 1:1 to prepare a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 40h, then immersing the treated membrane in the reaction solution B again, reacting at 80 ℃ for 24h, and putting the obtained product in deionized water to obtain the Fe (BTC)/PA membrane.
Carrying out performance test on the obtained Fe (BTC)/PA membrane; analyzing the surface of Fe (BTC) type metal organic framework material/polyamide nano composite film,
surface analysis of the Fe (BTC) type metal organic framework material/polyamide nanocomposite membrane revealed that the surface morphology of the Fe (BTC) type metal organic framework material/polyamide nanocomposite membrane of example 1 was not much different, the retention rate of 2000ppm NaCl was 94.03% at 0.6MPa, and the water flux reached 5.122L m%-2h-1bar-1。
Example 5
(1) Dissolving polysulfone 5mg into 20ml N, N-dimethylformamide solvent to obtain casting solution, ultrasonic standing for 12 hr for 20min, and spreading the casting solution at 50 deg.C in 100cm smooth surface2And (3) scraping the glass plate to form a film by using a 200-micron scraper, then immediately and quickly putting the obtained film into water, and after the film is completely formed, putting the obtained PSF support film into deionized water for later use.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of the m-phenylenediamine aqueous phase solution is uniformly dripped into 7.065cm of the PSF supporting film2Standing for 2min, removing excessive aqueous phase solution, and uniformly dripping 5ml of trimesoyl chloride organic phase solutionAdding the solution on a PSF support membrane treated by the aqueous phase solution, standing for 2min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
(3) 6.804g of ferric chloride is dissolved in water and ethanol in a volume ratio of 1:1 to prepare a reaction solution a, and 17.651g of trimesic acid was dissolved in a volume ratio of water to ethanol of 1:1 to prepare a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 40h, then immersing the treated membrane in the reaction solution B again, reacting at 80 ℃ for 24h, and putting the obtained product in deionized water to obtain the Fe (BTC)/PA membrane.
Carrying out performance test on the obtained Fe (BTC)/PA membrane; analyzing the surface of Fe (BTC) type metal organic framework material/polyamide nano composite film,
surface analysis of the Fe (BTC) type metal organic framework material/polyamide nanocomposite membrane revealed that the surface morphology of the Fe (BTC) type metal organic framework material/polyamide nanocomposite membrane of example 1 was not much different, the retention rate of 2000ppm NaCl was 94.25% at 0.6MPa, and the water flux reached 5.145L m%-2h-1bar-1。
Comparative example
(1) Dissolving polysulfone 5mg into 20ml N, N-dimethylformamide solvent to obtain casting solution, ultrasonically standing for 12h for 60min, and spreading the casting solution at 50 deg.C to smooth 100cm2And (3) scraping the glass plate to form a film by using a 200-micron scraper, then immediately and quickly putting the obtained film into water, and after the film is completely formed, putting the obtained PSF support film into deionized water for later use.
(2) Dissolving 0.4g of m-phenylenediamine in 20ml of deionized water to obtain a 2% m-phenylenediamine aqueous phase solution, and dissolving 0.02g of trimesoyl chloride in 20ml of n-hexane to obtain a 0.1% trimesoyl chloride organic phase solution; 5ml of the m-phenylenediamine aqueous phase solution is uniformly dripped into 7.065cm of the PSF supporting film2Standing for 2min, removing excessive aqueous phase solution, and adding 5ml of the organic phase solution of trimesoyl chloride dropwise into the aqueous phase solutionStanding the treated PSF supporting membrane for 2min, removing redundant organic phase solution, standing for 2min to obtain a treated membrane, and drying the treated membrane at 40 ℃ for 5min to obtain a polyamide membrane;
the polyamide membrane was subjected to surface analysis, as shown in FIG. 2, and it had a retention rate of 96.38% at 0.6MPa for 2000ppm NaCl and a water flux of 1.312L m-2h-1bar-1。
Claims (8)
1. A preparation method of a Fe (BTC) inlaid large-flux polyamide nano composite film is characterized by comprising the following steps: the method comprises the following steps:
(1) dissolving a raw material ultrafiltration membrane into an N, N-dimethylformamide solvent, stirring at room temperature to obtain a membrane casting solution, ultrasonically standing the membrane casting solution for 20-40 h to remove bubbles in the solution, laying the membrane casting solution on a smooth glass plate at 20-50 ℃, and scraping by using a scraper to form to obtain a PSF (pressure sensitive filter) support membrane; the adding amount of the N, N-dimethylformamide solvent is 5-10 ml/g based on the mass of the ultrafiltration membrane;
(2) dissolving m-phenylenediamine in deionized water to obtain a 0.1-8 wt% m-phenylenediamine aqueous phase solution, dissolving trimesoyl chloride in n-hexane, and performing ultrasonic treatment for 30-60 min to obtain a trimesoyl chloride organic phase solution; uniformly dropwise adding the m-phenylenediamine aqueous phase solution onto the PSF support membrane, standing for 2-8 min, removing redundant aqueous phase solution, further uniformly adding the trimesoyl chloride organic phase solution onto the PSF support membrane treated by the aqueous phase solution, standing for 2-8 min, removing redundant organic phase solution, standing for 2-10 min to obtain a treated membrane, and drying the treated membrane at 40-60 ℃ for 5-15 min to obtain a polyamide membrane; the amount of the trimesoyl chloride substance is 100-700 mmol/L in terms of the volume of n-hexane; the addition amount of the m-phenylenediamine aqueous phase solution is 0.7-1.4 ml/cm based on the area of the PSF support membrane2(ii) a The addition of the trimesoyl chloride organic phase solution is 0.7-1.4 ml/cm based on the area of the PSF supporting membrane2；
(3) Dissolving a ferric iron compound in a mixed solution of water and ethanol to obtain a reaction solution A, dissolving trimesic acid in a mixed solution of water and ethanol to obtain a reaction solution B, immersing the polyamide membrane obtained in the step (2) in the reaction solution A, standing at room temperature for 20-40 h, immersing the treated membrane in the reaction solution B, reacting at 60-80 ℃ for 12-24 h, and standing the obtained product in deionized water for 24h to obtain an Fe (BTC)/PA membrane; the amount of the ferric iron compound is 100-700 mmol/L based on the total volume of a mixed solution of water and ethanol; the amount of the trimesic acid is 100-700 mmol/L based on the total volume of the mixed solution of water and ethanol.
2. The method of claim 1 for preparing an fe (btc) -inlaid high-flux polyamide nanocomposite film, wherein: in the step (1), the ultrafiltration membrane is polysulfone, polyethersulfone or poly
Ethylene or polypropylene.
3. The method of claim 2 for preparing an fe (btc) -inlaid high-flux polyamide nanocomposite film, wherein: in the step (1), the ultrafiltration membrane is polysulfone.
4. The method of claim 1 for preparing an fe (btc) -inlaid high-flux polyamide nanocomposite film, wherein: in the step (1), the frequency of ultrasonic defoaming is 30-50 KHz, and the time is 0.2-3 h.
5. The method of claim 1 for preparing an fe (btc) -inlaid high-flux polyamide nanocomposite film, wherein: in the step (1), the thickness of the PSF support film is 100-300 μm.
6. The method for preparing an Fe (BTC) -inlaid high-flux polyamide nanocomposite film according to claim 1, wherein in the step (3), the ferric iron compound is: ferric chloride, ferric nitrate or ferric sulphate.
7. The method for preparing the Fe (BTC) -inlaid high-flux polyamide nanocomposite membrane according to claim 1, wherein in the step (3), the volume ratio of water to ethanol is 1: 1-10.
8. Use of a Fe (BTC)/polyamide nanocomposite reverse osmosis membrane having a large flux prepared by the method for preparing an Fe (BTC) -inlaid large-flux polyamide nanocomposite membrane according to any one of claims 1 to 7 in a desalination process.
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