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

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...

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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 with the molecules in the previous layer of cured hydrogel, and finally form a more dense and uniform interpenetrating network structure, and the intermittent interpenetrating cross-linking mode between layers is reduced to a certain extent. The thickness of the hydrogel layer, thereby shortening the water transport channel and improving the flux

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