Positive osmosis membrane capable of trapping ammonia nitrogen and resisting membrane pollution, preparation method and applications thereof

A forward osmosis membrane and membrane fouling technology, which is applied in chemical instruments and methods, water pollutants, semipermeable membrane separation, etc., can solve the problems of weak ammonia nitrogen interception ability and poor anti-membrane fouling ability, and improve anti-membrane fouling ability, increase hydrophilicity, and enhance the effect of membrane surface potential

Inactive Publication Date: 2019-02-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the existing commercial FO membranes have weak interception ability to ammonia nitrogen and poor anti-membrane fouling ability, the present invention provides a forward osmosis membrane that intercepts ammonia nitrogen and resists membrane fouling and its preparation method and application

Method used

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  • Positive osmosis membrane capable of trapping ammonia nitrogen and resisting membrane pollution, preparation method and applications thereof
  • Positive osmosis membrane capable of trapping ammonia nitrogen and resisting membrane pollution, preparation method and applications thereof
  • Positive osmosis membrane capable of trapping ammonia nitrogen and resisting membrane pollution, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034]The sulfonated polyethersulfone polymer with a sulfonation degree of 1%, polyethylene glycol (Mw=600) and N,N-dimethylpyrrolidone were mixed in a weight fraction ratio of 14:10:76, ​​sealed, heated and stirred. , After defoaming, it is prepared into a casting liquid, and the casting liquid is evenly scraped on a clean glass plate with a scraper (the height of the scraper is 100 μm). solvent. Under the operating temperature of 30°C, the upper surface of the base film was immersed in an aqueous solution of m-phenylenediamine with a mass concentration of 2%. After 2 minutes, the base film was taken out and the solution on the surface was blotted dry with filter paper, and then the obtained The upper surface of the base film continued to be immersed in the n-hexane solution of trimesoyl chloride with a mass concentration of 0.1%, the film was taken out after 1 min, and the surface of the film was rinsed with the n-hexane solution to remove unreacted trimesoyl chloride, and t...

Embodiment 2

[0037] The sulfonated polyethersulfone polymer with a sulfonation degree of 1%, polyethylene glycol (Mw=600) and N,N-dimethylpyrrolidone were mixed in a weight fraction ratio of 14:10:76, ​​sealed, heated and stirred. , After defoaming, it is prepared into a casting liquid, and the casting liquid is evenly scraped on a clean glass plate with a scraper (the height of the scraper is 100 μm). solvent. Under the operating temperature of 30°C, the upper surface of the base film was immersed in an aqueous solution of m-phenylenediamine with a mass concentration of 2%. After 2 minutes, the base film was taken out and the solution on the surface was blotted dry with filter paper, and then the obtained The upper surface of the base film continued to be immersed in the n-hexane solution of trimesoyl chloride with a mass concentration of 0.1%, the film was taken out after 1 min, and the surface of the film was rinsed with the n-hexane solution to remove unreacted trimesoyl chloride, and ...

Embodiment 3

[0040] The sulfonated polyethersulfone polymer with a sulfonation degree of 1%, polyethylene glycol (Mw=600) and N,N-dimethylpyrrolidone were mixed in a weight fraction ratio of 14:10:76, ​​sealed, heated and stirred. , After defoaming, it is prepared into a casting liquid, and the casting liquid is evenly scraped on a clean glass plate with a scraper (the height of the scraper is 100 μm). solvent. Under the operating temperature of 30°C, the upper surface of the base film was immersed in an aqueous solution of m-phenylenediamine with a mass concentration of 2%. After 2 minutes, the base film was taken out and the solution on the surface was blotted dry with filter paper, and then the obtained The upper surface of the base film continued to be immersed in the n-hexane solution of trimesoyl chloride with a mass concentration of 0.1%, the film was taken out after 1 min, and the surface of the film was rinsed with the n-hexane solution to remove unreacted trimesoyl chloride, and ...

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Abstract

The invention discloses a positive osmosis membrane capable of trapping ammonia nitrogen and resisting membrane pollution, a preparation method and applications thereof, wherein the positive osmosis membrane is a polyamide amine dendrimer surface grafted composite membrane, the base layer of the composite membrane is sulfonated polyethersulfone, and the separation layer is polyamide. The specificpreparation steps comprise: 1, preparation of sulfonated polyethersulfone base membrane; 2, preparation of polyamide composite membrane; and 3, preparation of polyamide amine dendrimer surface graftedcomposite membrane. According to the present invention, the positive osmosis membrane prepared by the method can be used for concentrating domestic sewage; the sulfonated polyethersulfone in the prepared positive osmosis membrane can significantly increase the hydrophilicity of the support layer to reduce the concentration polarization in the membrane, such that the water flux of the membrane issubstantially improved; and the polyamide amine dendrimer grafted on the polyamide active layer surface can improve the repulsive force of the membrane to ammonia nitrogen and the hydrophilicity of the membrane surface, such that the ammonia nitrogen trapping ability and the pollution resistance of the grafted membrane can be improved.

Description

technical field [0001] The invention relates to a preparation method of a permeable membrane and its application, in particular to a forward osmosis membrane with high ammonia nitrogen interception capacity and strong anti-membrane fouling capacity at the same time, its preparation method and its actual efficiency for concentrating domestic sewage. Background technique [0002] Due to the rapid population growth, the intensification of urbanization and the intensification of human activities, the shortage of fresh water resources and resource scarcity have increasingly become serious problems that threaten the sustainable development of mankind. At present, the total discharge of domestic sewage in the country is increasing year by year. Limited by the scale of sewage treatment plants, a large amount of domestic sewage is directly discharged into natural water bodies without treatment. Activated sludge method is a mature and effective method for treating domestic sewage at p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/12B01D69/02B01D67/00B01D61/00C02F1/44C02F101/16
CPCB01D61/002B01D67/0006B01D67/0093B01D69/02B01D69/12B01D71/78B01D2325/36C02F1/445C02F2101/16
Inventor 时文歆鲍现崔福义吴清莲
Owner HARBIN INST OF TECH
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