Super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane as well as preparation method and application thereof

A chitosan quaternary ammonium salt, chitosan technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of shortening and reducing the thickness of the hydrogel layer, to improve flux and effectively intercept , the effect of stable performance

Active Publication Date: 2022-02-15
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the room temperature crosslinking method to solve the energy consumption problem of traditional thermal crosslinking and photocrosslinking; at the same time, quantitative multiple loads can overcome the film surface defects caused by uneven crosslinking of a single load; The gel liquid can be further cross-linked wi

Method used

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  • Super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane as well as preparation method and application thereof
  • Super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane as well as preparation method and application thereof
  • Super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 2.0g of chitosan quaternary ammonium salt powder (purchased from Nantong Lvshen Bioengineering Co., Ltd., degree of substitution ≥ 90.0) into 58.0g of 2vol% acetic acid aqueous solution at 60°C for 7 hours with magnetic force stirring, and naturally cool to room temperature to obtain Transparent solution A;

[0027] (2) Add 1.5g N, N-methylenebisacrylamide (MBA) and 8.0g acrylamide (AM) to 30.4g 2vol% acetic acid aqueous solution for 1h, then add 0.10g initiator ammonium persulfate (APS) Continue stirring for 15 minutes to obtain solution B;

[0028] (3) Mix solution A and solution B at room temperature, and magnetically stir for 10 minutes to obtain a pregel solution with room temperature self-crosslinking function;

[0029] (4) Dry the polyethersulfone base film soaked in pure water overnight, fix it between the polytetrafluoroethylene plate frame with grooves, place it on a plane, and follow the 0.50g / cm 2 Coat the pre-gel solution prepared in step (3) on t...

Embodiment 2

[0031] (1) Add 2.0 g of chitosan quaternary ammonium salt powder to 58.0 g of 2 vol% acetic acid aqueous solution and stir magnetically at 60° C. for 7 hours, and cool naturally to room temperature to obtain a transparent solution A;

[0032] (2) Add 1.5g N, N-methylenebisacrylamide (MBA) and 8.0g acrylamide (AM) to 30.4g 2vol% acetic acid aqueous solution for 1h, then add 0.10g initiator ammonium persulfate (APS) Continue stirring for 15 minutes to obtain solution B;

[0033] (3) Mix solution A and solution B at room temperature, and mechanically stir for 10 minutes to obtain a pregel solution with room temperature self-crosslinking function;

[0034] (4) Dry the polyethersulfone base film soaked in pure water overnight, fix it between the polytetrafluoroethylene frame with grooves, place it on a plane, and add 0.75g / cm 2 The pre-gel solution is coated on the surface of the PES base film, cured at room temperature for 3 minutes, and this operation is repeated four times, and...

Embodiment 3

[0036] (1) Add 1.0 g of chitosan quaternary ammonium salt powder to 59.0 g of 2 vol% acetic acid aqueous solution, stir magnetically at 60° C. for 6 h, and naturally cool to room temperature to obtain a transparent solution A;

[0037] (2) Add 1.0g of N,N-methylenebisacrylamide (MBA) and 6.0g of acrylamide (AM) to 32.95g of 2vol% acetic acid aqueous solution to dissolve for 1h, then add 0.05g of initiator ammonium persulfate (APS) Continue stirring for 15 minutes to obtain solution B;

[0038] (3) Mix solution A and solution B at room temperature, and magnetically stir for 10 minutes to obtain a pregel solution with room temperature self-crosslinking function;

[0039] (4) Dry the polyethersulfone base film soaked in pure water overnight, fix it between the polytetrafluoroethylene frame with grooves, place it on a plane, and add 0.75g / cm 2 The pre-gel solution is coated on the surface of the PES base film, cured at room temperature for 3 minutes, and this operation is repeate...

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Abstract

The invention discloses a super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane and a preparation method and application thereof. The preparation method comprises the following steps of: adding chitosan quaternary ammonium salt powder into an acetic acid aqueous solution, and heating and stirring to obtain a transparent solution A; adding and dissolving a reinforcing agent acrylamide and a cross-linking agent into an acetic acid aqueous solution, then adding an initiator, and stirring until the initiator is completely dissolved to obtain a solution B; mixing the solution A and the solution B, and stirring well to obtain pre-gelled liquid with a room-temperature self-crosslinking function; and by taking an ultrafiltration membrane as a base membrane, transferring the pre-gelled liquid to the surface of the base membrane by adopting a surface multi-time coating method, and after cross-linking and curing at room temperature, putting the pre-gelled liquid into a blast oven for heat treatment to obtain the super-hydrophilic chitosan quaternary ammonium salt hydrogel composite membrane. The preparation method disclosed by the invention is simple. The surface of the obtained composite membrane is super-hydrophilic, the flux of the composite membrane is higher than that of a membrane prepared by a traditional single loading method, the anti-pollution performance is remarkably enhanced, and the composite membrane has a relatively high rejection rate on divalent cations.

Description

technical field [0001] The invention discloses a superhydrophilic chitosan quaternary ammonium hydrogel composite membrane and its preparation method and application. The composite membrane has superhydrophilicity and strong anti-organic pollution performance, and belongs to the technical field of separation membrane preparation and application . Background technique [0002] The shortage of water resources and serious water pollution have become the main bottleneck restricting the sustainable development of my country's social economy. The diversity and complexity of organic pollution have also exacerbated environmental pollution and water resource crisis. Membrane separation technology has been increasingly used to deal with water crisis and environmental pollution. [0003] However, with the increasingly complex water environment, traditional separation membranes are easily polluted due to their surface hydrophobicity and low surface energy, resulting in a significant d...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D71/74C09D4/06C09D4/02
CPCB01D69/125B01D69/02B01D67/0093B01D71/74C09D4/06B01D2325/36B01D2325/24
Inventor 高学理王小娟李亚敏王新艳高从堦
Owner OCEAN UNIV OF CHINA
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