Modification method for improving chlorine resistance of polyacrylonitrile forward osmosis membrane

A polyacrylonitrile and forward osmosis membrane technology, applied in the field of water treatment, can solve the problems of increasing the mass transfer resistance of the membrane surface and reducing the membrane flux, and achieve the effects of simple and cheap modification methods, improved flux reduction, and reduced costs

Active Publication Date: 2021-06-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter which modification method is used, the addition of modified substances will increase the mass transfer resistance on the membrane surface and cause a decrease in membrane flux.

Method used

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  • Modification method for improving chlorine resistance of polyacrylonitrile forward osmosis membrane
  • Modification method for improving chlorine resistance of polyacrylonitrile forward osmosis membrane
  • Modification method for improving chlorine resistance of polyacrylonitrile forward osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Porous PAN supports were prepared by non-solvent induced phase separation (NIPS) method. First, polyacrylonitrile with a mass fraction of 16.7% was dissolved in N-methylpyrrolidone solution, porogen lithium chloride was added with a mass fraction of 0.8%, and the mixture was stirred at 60 °C for 12 hours. After the casting film solution is completely dissolved, the casting film solution is put into an ultrasonic cleaning machine for degassing treatment to remove air bubbles generated during the stirring process. After 24 hours, pour the casting liquid on the glass plate, scrape the film with a film applicator, and control the thickness to be about 60 μm, and then immediately put it into the deionized water coagulation bath to obtain the support film. Then the functional layer is prepared on the prepared carrier by IP (interfacial polymerization) method. First, immerse the prepared supporting membrane in m-phenylenediamine solution (water as solvent, mass fraction of m-...

Embodiment 2

[0033] Porous PAN supports were prepared by non-solvent induced phase separation (NIPS) method. First, polyacrylonitrile with a mass fraction of 17.0% was dissolved in a N,N-dimethyldiformamide solution, and a porogen lithium chloride was added with a mass fraction of 1.0%, and the mixture was stirred at 60 °C for 12 hours. After the casting film solution is completely dissolved, the casting film solution is put into an ultrasonic cleaning machine for degassing treatment to remove air bubbles generated during the stirring process. After 24 hours, pour the casting liquid on the glass plate, scrape the film with a film applicator, and control the thickness to be about 60 μm, and then immediately put it into the deionized water coagulation bath to obtain the support film. Then the functional layer is prepared on the prepared carrier by IP (interfacial polymerization) method. First, soak the prepared support membrane in m-phenylenediamine solution (water as solvent, the mass frac...

Embodiment 3

[0036] Porous PAN supports were prepared by non-solvent induced phase separation (NIPS) method. First, polyacrylonitrile with a mass fraction of 16.8% was dissolved in N-methylpyrrolidone solution, porogen zinc chloride was added, and the mass fraction was 0.8%, and the mixture was stirred at 60 °C for 12 hours. After the casting film solution is completely dissolved, the casting film solution is put into an ultrasonic cleaning machine for degassing treatment to remove air bubbles generated during the stirring process. After 24 hours, pour the casting liquid on the glass plate, scrape the film with a film applicator, and control the thickness to be about 60 μm, and then immediately put it into the deionized water coagulation bath to obtain the support film. Then the functional layer is prepared on the prepared carrier by IP (interfacial polymerization) method. First, soak the prepared supporting membrane in m-phenylenediamine solution (water is the solvent, the mass fraction ...

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Abstract

The invention belongs to the technical field of water treatment, and discloses a modification method for improving chlorine resistance of a polyacrylonitrile forward osmosis membrane. The method comprises the steps: dissolving polyacrylonitrile in an organic solvent N-methyl pyrrolidone, adding a pore-foaming agent, putting the mixture into an ultrasonic cleaning machine for degassing treatment after the mixture is completely dissolved, and removing gas generated in the stirring process to form a membrane casting solution; pouring the membrane casting solution on a glass plate, scraping the membrane by using a membrane coating device, then immediately putting the membrane into a deionized water coagulating bath, and obtaining a polyacrylonitrile support membrane by using an immersion-precipitation phase inversion method; and preparing a polyamide functional layer by virtue of an interfacial polymerization method, then cleaning with n-hexane, and removing unreacted 1,3,5-trimesoyl chloride on the surface, so as to obtain the cyclohexylamine modified polyacrylonitrile forward osmosis membrane. On the premise of ensuring the flux of the polyacrylonitrile forward osmosis membrane, the chlorine resistance of the membrane is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a modification method for improving the chlorine resistance of a polyacrylonitrile forward osmosis membrane. Background technique [0002] At present, the shortage of fresh water resources has become a major problem restricting the development of human society. As a traditional pressure-driven separation technology, reverse osmosis (RO) technology has been widely used in brackish water desalination and pure water preparation. However, RO energy consumption is too high, and its application in energy-scarce regions has certain limitations. In contrast, forward osmosis (FO) technology has attracted attention due to its low energy consumption, low fouling tendency, and high stability. Especially in the field of brackish water desalination, FO has become the most research value and potential. one of the technologies. [0003] FO membranes usually consist of two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D71/56B01D71/82B01D69/02B01D69/10B01D67/00
CPCB01D71/42B01D71/56B01D71/82B01D69/02B01D67/0011B01D67/0013B01D69/10B01D67/0002Y02A20/131
Inventor 李英华邓文贺张诗杰李海波苏菲
Owner NORTHEASTERN UNIV
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