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A preparation method of a solvent-resistant nanofiltration membrane composited with graphene oxide and self-porous polymer

A microporous polymer, graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve excellent separation behavior, mild operation, and simple operation.

Active Publication Date: 2021-12-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene oxide films are unstable in water but have great stability in various organic solvents

Method used

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  • A preparation method of a solvent-resistant nanofiltration membrane composited with graphene oxide and self-porous polymer
  • A preparation method of a solvent-resistant nanofiltration membrane composited with graphene oxide and self-porous polymer
  • A preparation method of a solvent-resistant nanofiltration membrane composited with graphene oxide and self-porous polymer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Dissolve 0.00125g of PIM-1 (self-providing microporous polymer) powder in 10mLTHF (tetrahydrofuran), stir for 10min, ultrasonicate for 3min, and stir for 2h to obtain a uniformly dispersed PIM-1 solution; weigh 0.0025gGO (graphene oxide) in In 10mL of water, stir for 10min, then sonicate for 30min, and then stir for 2h to obtain a completely dissolved GO aqueous solution; take 1mL of GO solution, add 5mL of DMF (N,N-dimethylformamide) and stir well, add 1mL of PIM-1 solution and stir well before adding 5mLDMF was stirred evenly; after the solution obtained in the previous step was continuously stirred for 2h, it was ultrasonicated for 10min, and then continuously stirred to obtain a uniform GO-PIM-0.5 (the mass ratio of PIM-1 and GO was 0.5) solution; prepared by vacuum filtration GO-PIM composite membrane, the sand core is washed with NMP (N-methylpyrrolidone) before suction filtration, and the 0.22μm pore size nylon membrane swollen with 40mL of absolute ethanol is pla...

example 2

[0028] Dissolve 0.0025g of PIM-1 (self-providing microporous polymer) powder in 10mLTHF (tetrahydrofuran), stir for 10min, ultrasonicate for 3min, and stir for 2h to obtain a uniformly dispersed PIM-1 solution; weigh 0.0025gGO (graphene oxide) in 10mL water, stirred for 10min, then ultrasonicated for 30min, and then stirred for 2h to obtain a completely dissolved GO aqueous solution; then, as the above method, the GO-PIM-1 (the mass ratio of PIM-1 and GO is 1) composite membrane was prepared by vacuum filtration , Make sure that the initial filtration time is consistent each time, then turn off the vacuum pump, and soak the membrane in absolute ethanol.

[0029] The GO-PIM-1 composite membrane was tested with a dead-end device. At 0.05Mpa, the flux of the X-3B dye solution with ethanol as the solvent was 33.90L / (m2 h bar), and the rejection rate was 92.75 %.

example 3

[0031] Dissolve 0.0050g of PIM-1 (self-providing microporous polymer) powder in 10mLTHF (tetrahydrofuran), stir for 10min, ultrasonicate for 3min, and then stir for 2h to obtain a uniformly dispersed PIM-1 solution; weigh 0.0025gGO (graphene oxide) in 10mL of water, stirred for 10min, then sonicated for 30min, and then stirred for 2h to obtain a completely dissolved GO aqueous solution; then, as the above method, the GO-PIM-2 (the mass ratio of PIM-1 and GO is 2) composite membrane was prepared by vacuum filtration , Make sure that the initial filtration time is consistent each time, then turn off the vacuum pump, and soak the membrane in absolute ethanol.

[0032] The membrane performance test of GO-PIM-2 composite membrane was performed with a dead-end device, the flux was 61.88L / (m2·h·bar), and the rejection rate was 90.16%.

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Abstract

The invention discloses a preparation method of a solvent-resistant nanofiltration membrane composed of graphene oxide and self-porous polymer: uniformly dispersing PIM‑1 in an organic solution A to obtain PIM with a concentration of 0.1-0.3 g / L ‑1 organic solution; dispersing graphene oxide in water to obtain an aqueous solution with a concentration of 0.1 to 0.3 g / L graphene oxide; adding the aqueous solution of graphene oxide to solvent B and stirring evenly to obtain a GO mixed solution; Add the GO mixed solution to the organic solution of the obtained PIM-1 to obtain the GO-PIM mixed solution; then add solvent C to the GO-PIM mixed solution, stir and continue stirring after ultrasonic to obtain a uniformly dispersed GO-PIM solution, A solvent-resistant nanofiltration membrane composed of graphene oxide and self-porous polymer was prepared by vacuum filtration on the bottom membrane. In the invention, the composite membrane prepared by the vacuum filtration method is relatively uniform, and the operation is simple and mild.

Description

technical field [0001] The invention belongs to the technical field of inorganic-organic composite separation, and in particular relates to a preparation method of a solvent-resistant nanofiltration membrane composed of graphene oxide and self-porous polymer. Background technique [0002] Industrial wastewater pollution is still a great challenge to the world today, and membrane separation technology has higher selectivity and controllable structure than traditional separation technology. Commonly used methods for preparing composite nanofiltration membranes include surface coating, interfacial polymerization, and surface grafting. However, the surface coating method is prone to defects due to the evaporation of the surface solution and the change of surface tension; the composite nanofiltration membrane prepared by the interfacial polymerization method has defects in anti-pollution and stability, which leads to a significant decline in membrane performance and shortens the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D69/02B01D67/00
CPCB01D71/021B01D69/12B01D69/02B01D67/0079
Inventor 张国亮侯蕊徐泽海孟琴
Owner ZHEJIANG UNIV OF TECH