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Nanofiltration membrane based on graphene oxide as well as preparation method and application of nanofiltration membrane

A graphene and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of difficult preparation of membrane materials, achieve suppression of macropore defects, increase transmission resistance, and improve selectivity Effect

Active Publication Date: 2022-05-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of membrane materials with inner selective layers has always been a difficult point.

Method used

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  • Nanofiltration membrane based on graphene oxide as well as preparation method and application of nanofiltration membrane
  • Nanofiltration membrane based on graphene oxide as well as preparation method and application of nanofiltration membrane
  • Nanofiltration membrane based on graphene oxide as well as preparation method and application of nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of polyimide hollow fiber base membrane

[0041] Place the PI polymer in an oven at 90°C for 12 hours to remove moisture. Then the PI polymer powder was dissolved in a certain proportion of NMP and PEG400 mixed solvent, and stirred for 24 hours to form a uniform solution. Finally, let stand at room temperature for 48 hours to remove air bubbles.

[0042] With the help of three-hole spinneret, the hollow fiber base membrane is prepared by using dry jet-wet spinning method and co-extrusion technology. The three-hole spinneret is divided into outer hole, middle hole and inner hole. An ISCO syringe pump is used to pump the PI casting liquid into the middle hole, and two liquid chromatography pumps pump the core liquid (water) and the protection liquid (NMP) into the inner hole and the outer hole of the spinneret respectively. The spinning solution extruded from the spinneret enters the gel bath (water) after passing through an air gap. The hollow fiber m...

Embodiment 2

[0052] Performance Test of Hollow Fiber Nanofiltration Membrane

[0053] The nanofiltration performance of the composite hollow fiber membrane is at room temperature and 4bar operating pressure, using such as figure 2 Measured with a home-made test setup as shown. Five different membrane modules were tested for each set of experiments to ensure the reproducibility of the experimental results. In this work, the permeation flux of the composite membrane to aqueous solution (deionized water) and different organic solvents (Hexane, EtOH, IPA, DMF, MeOH, and ACN) was evaluated, respectively. Before each solvent performance test, the membrane assembly needs to be immersed in the solvent to be tested for 12 hours to complete the solvent replacement, remove other solvents on the membrane, and reduce the impact of interfacial water on the membrane performance.

[0054] The test device for the separation performance is the same as above. 20 mg of the solutes to be tested (RBss, BB, R...

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Abstract

The invention relates to a hollow fiber nanofiltration membrane based on graphene oxide as well as a preparation method and application thereof, and belongs to the technical field of polymer separation membranes. The internal selection hollow fiber graphene oxide composite membrane is prepared on the basis of a one-step overall cross-linking method and is further applied to concentration of acetonitrile in an acetonitrile / water mixture, and the influence of solvent viscosity on the transmission rate of the graphene oxide composite membrane is increased by utilizing the tortuosity of a GO nano channel. Moreover, compared with the traditional cross-flow filtration coating method, the dead-end filtration coating mode adopted by the invention can ensure that the GO nanosheets are only subjected to the action of pressure vertical to the membrane surface, and can be orderly assembled on the PI base membrane from bottom to top, so that larger structural defects are effectively inhibited, and the nanofiltration performance is enhanced.

Description

technical field [0001] The invention relates to a graphene oxide-based nanofiltration membrane, a preparation method and application thereof, and belongs to the technical field of polymer separation membranes. Background technique [0002] Organic solvents are widely used in pharmaceutical and chemical production. Taking acetonitrile as an example, in many occasions where acetonitrile is used for chemical reactions, anhydrous acetonitrile is required, and the reaction mixture needs to be treated with water. This results in a large amount of aqueous acetonitrile waste after the reaction. Its handling has been a problem because acetonitrile azeotropes with water (86 wt% ACN and 14 wt% water) and is miscible in any ratio. Therefore, methods such as salting out, adding a water agent for azeotropic distillation or extractive distillation can only be used to recover the acetonitrile in the waste liquid as much as possible. However, using these methods to recover acetonitrile ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D69/08B01D67/00B01D71/64
CPCB01D61/027B01D69/08B01D67/0079B01D71/64Y02A20/131
Inventor 孙世鹏张春旭刘美玲孙宇轩邢卫红
Owner NANJING UNIV OF TECH