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Self-supporting homogeneous forward osmosis membrane capable of eliminating internal concentration polarization and its preparation method and application

A forward osmosis membrane, self-supporting technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane, etc., can solve problems such as difficult cleaning, internal concentration polarization, membrane fouling, etc., and achieve easy cleaning and good stability , Strong anti-fouling and anti-bacterial properties

Active Publication Date: 2020-10-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of internal concentration polarization, membrane fouling, difficult cleaning and high energy consumption of traditional asymmetric forward osmosis membrane (TFC), the purpose of the present invention is to provide a self-supporting homogeneous forward osmosis membrane, a preparation method and its application

Method used

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  • Self-supporting homogeneous forward osmosis membrane capable of eliminating internal concentration polarization and its preparation method and application
  • Self-supporting homogeneous forward osmosis membrane capable of eliminating internal concentration polarization and its preparation method and application
  • Self-supporting homogeneous forward osmosis membrane capable of eliminating internal concentration polarization and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0042] Preparation of copolymer (I)-1

[0043] Pour 4.0010g of dicarboxydiphenyl ether into an appropriate amount of polyphosphoric acid, stir at 100°C for 1 hour; add hydrazine sulfate (2.4188g) into the reaction system, the molar ratio of hydrazine sulfate to dicarboxydiphenyl ether monomer is 1.2:1, Raise the temperature to 160°C, and react at high temperature for 6 hours; pour the viscous solution into 5wt% NaOH solution to precipitate, wash until neutral, and dry in vacuum for later use to obtain 3.4376g of a brownish yellow solid with a yield of about 93.56%; from figure 1 According to NMR and IR spectra, the copolymer (I)-1 was successfully synthesized.

[0044]

Embodiment 2

[0046] Preparation of copolymer (I)-2

[0047] Pour 4.0031g of bis(4-carboxyphenyl)hexafluoropropane into an appropriate amount of polyphosphoric acid, stir at 100°C for 1h; add hydrazine sulfate (1.5908g g) into the reaction system, hydrazine sulfate and bis(4-carboxyphenyl) The molar ratio of hexafluoropropane monomer was 1.2:1, and the reaction was carried out at 160°C for 6 hours; the viscous solution was poured into 5wt% NaOH solution to precipitate, washed to neutrality, and vacuum-dried for later use to obtain 3.2576 g of a brownish-yellow solid with a yield of about 86.20%; from figure 1 According to NMR and IR spectra, the copolymer (I)-1 was successfully synthesized.

[0048]

[0049] Depend on figure 1 The nuclear magnetic pattern of can prove that copolymer (I) has been successfully synthesized.

Embodiment 3

[0051] Preparation of copolymer (II)-1

[0052] 0.6012g copolymer (I)-1 was dissolved in NMP, the system concentration was 5wt%, and a small amount of PPA was added to the reaction system; after the polymer was completely dissolved, it was cooled to room temperature, and then 0.3512g p-aminobenzoic acid was added, React at 195°C for 12 hours; after the reaction, slowly pour the solution cooled to room temperature into hot water, the product precipitates, wash with water to neutrality and then vacuum dry to obtain 0.6952g of copolymer (II)-1, the yield is about 70.90%. Wherein: during the reaction process, the molar ratio of the amino-containing monomer to the polymer A is controlled at 1:1.

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Abstract

The invention discloses a self-supporting homogeneous forward osmosis membrane that can eliminate internal concentration polarization and its preparation method and application. The self-supporting forward osmosis membrane is based on a polyoxadiazole structure as a skeleton, and is modified with an amino-containing monomer to obtain a polytriazole / oxadiazole copolymer, and a defect-free self-supporting homogeneous film is prepared using a solvent evaporation method. , and applied in forward osmosis. By adjusting factors such as the concentration, volume and film-forming temperature of the casting liquid, the present invention obtains forward osmosis membranes with different properties, selects appropriate extraction liquids, and completes the forward osmosis test; compared with commercial membranes, the membrane material of the present invention The flux loss is small, the dye concentration time is significantly shortened, and the operating efficiency is significantly improved; in addition, the self-supporting homogeneous forward osmosis membrane produced by the present invention also has the advantages of good stability, resistance to pollution, and easy cleaning, and can effectively Achieve positive penetration requirements.

Description

technical field [0001] The invention belongs to the technical field of forward osmosis membrane preparation, and relates to a self-supporting homogeneous forward osmosis membrane capable of eliminating internal concentration polarization, a preparation method and application thereof. Background technique [0002] In recent years, with the in-depth introduction of the concept of zero discharge, the recovery and reuse of useful substances in wastewater has been paid more and more attention. In modern industrial production, especially in the synthesis and application of dyes, the discharge of high-salinity dye wastewater has seriously endangered human health and the ecological environment, and has become the most challenging wastewater. High-salinity dye wastewater has high chroma and high salt content (>6% NaCl, >5% Na 2 SO 4 ), pH fluctuation (1-14) and high toxicity (refractory to biodegradation). The recycling of dyes and salts can not only significantly reduce the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D69/12B01D71/80C02F103/08C02F101/34C02F101/38
CPCB01D69/125B01D71/80C02F2101/38C02F2101/40C02F2101/34C02F2103/08B01D61/0024B01D71/62B01D65/08B01D69/02B01D71/76C02F1/445B01D2325/48B01D65/02B01D2321/168
Inventor 张轩李猛王连军
Owner NANJING UNIV OF SCI & TECH
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