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Dopamine and polyvinyl alcohol compounded modified polysulfone forward osmosis membrane as well as preparation method and application thereof

A technology of polyvinyl alcohol and compound modification, applied in the field of membrane separation, can solve the problems of no water available, complicated equipment, and inability to apply emergency rescue, etc., and achieve the effect of high mechanical strength

Active Publication Date: 2021-03-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the coal mine accident as an example, there is a large amount of roadway water seepage around the trapped people in the mine, but due to the serious excess of fluoride ions, sulfate ions and Escherichia coli, they cannot be directly drunk, resulting in the dilemma of no water available
Traditional water treatment methods have complicated equipment, bulky equipment and the need for additional energy, which cannot be applied to emergency rescue

Method used

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  • Dopamine and polyvinyl alcohol compounded modified polysulfone forward osmosis membrane as well as preparation method and application thereof
  • Dopamine and polyvinyl alcohol compounded modified polysulfone forward osmosis membrane as well as preparation method and application thereof
  • Dopamine and polyvinyl alcohol compounded modified polysulfone forward osmosis membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1): Add polysulfone particles with a mass percentage of 12 to N,N-dimethylformamide, N-methylpyrrolidone and acrylic acid solvent, stir and fully dissolve at 80°C, and continue stirring for 10 hours , and then let it stand for more than 2 hours to completely defoam, and then the prepared casting solution is ready for use;

[0031] Step (2): Coat the casting solution prepared in step (1) on the polyester screen that has been soaked and pretreated in N,N-dimethylformamide, and scrape it evenly on the non-woven fabric with a scraper. Form the bottom film layer on the cloth and leave it in the air for 10 seconds, then put the bottom film layer into the gel bath to form a bottom layer with a porous structure through phase inversion gel, the composition of the gel bath is deionized water, The gel bath time is 10 minutes. After the solvent is completely removed, put it into deionized water and save it for later use;

[0032] Step (3): Immerse the porous bottom layer pre...

Embodiment 2

[0036] Step (1): Add polysulfone particles with a mass percentage of 14 to a solvent consisting of N,N-dimethylformamide and N-methylpyrrolidone, stir and fully dissolve at 80°C, continue stirring for 8 hours, and then Leave it to stand for more than 2 hours to make it completely defoamed, and then the prepared casting solution is obtained and set aside;

[0037] Step (2): Coat the casting solution prepared in step (1) on the polyester screen that has been soaked and pretreated in N,N-dimethylformamide, and scrape it evenly on the non-woven fabric with a scraper. Form the bottom film layer on the cloth and leave it in the air for 10 seconds, then put the bottom film layer into the gel bath to form a bottom layer with a porous structure through phase inversion gel, the composition of the gel bath is deionized water, The gel bath time is 10 minutes. After the solvent is completely removed, put it into deionized water and save it for later use;

[0038] Step (3): Immerse the por...

Embodiment 3

[0043] Step (1): Add polysulfone particles with a mass percentage of 12 to a solvent consisting of N,N-dimethylformamide and N-methylpyrrolidone, stir and fully dissolve at 80°C, continue stirring for 10 hours, and then Leave it to stand for more than 2 hours to make it completely defoamed, and then the prepared casting solution is obtained and set aside;

[0044]Step (2): Coat the casting solution prepared in step (1) on the polyester screen that has been soaked and pretreated in N,N-dimethylformamide, and scrape it evenly on the non-woven fabric with a scraper. Form the bottom film layer on the cloth and leave it in the air for 10 seconds, then put the bottom film layer into the gel bath to form a bottom layer with a porous structure through phase inversion gel, the composition of the gel bath is deionized water, The gel bath time is 10 minutes. After the solvent is completely removed, put it into deionized water and save it for later use;

[0045] Step (3): Immerse the por...

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Abstract

The invention discloses a dopamine and polyvinyl alcohol compounded modified polysulfone forward osmosis membrane as well as a preparation method and application thereof. The forward osmosis membranecomprises: a supporting layer which is a polyester screen supporting layer; a porous bottom layer which is a polysulfone porous bottom layer; and an active layer which is a polyamide active layer modified by dopamine and polyvinyl alcohol. According to the forward osmosis membrane disclosed by the invention, under the condition of maintaining a high salt rejection rate, a polysulfone porous bottomlayer prepared by a phase inversion method and a dopamine and polyvinyl alcohol modified active layer are combined, so that the water flux and the salt rejection rate are greatly improved. The composite forward osmosis membrane is used for preparing an emergency water bag. The water bag is simple to prepare, easy to carry and reusable, can be applied to the field of emergency rescue, and is particularly used for solving the problem that trapped people lack drinking water due to mines, earthquakes, natural disasters and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a dopamine-polyvinyl alcohol composite modified polysulfone forward osmosis membrane and a preparation method and application thereof. Background technique [0002] Forward osmosis is an osmotic-driven membrane separation technology guided by chemical potential difference or osmotic pressure. It can be realized without external pressure. It has the characteristics of low energy consumption, low pollution, and high recovery. It is widely used in aerospace, pharmaceuticals, dialysis, and green energy. , seawater desalination, wastewater treatment, food concentration and other fields. [0003] Currently, the main methods for constructing the separation layer of forward osmosis membranes include interfacial polymerization and phase inversion. In theory, forward osmosis can use a draw solution with a very high osmotic pressure to achieve a greater water flux t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00
CPCB01D71/68B01D69/12B01D67/0002
Inventor 刘二勇杜双明张兴
Owner XIAN UNIV OF SCI & TECH
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