Method for improving water flux of polyelectrolyte nanofiltration membrane

A polyelectrolyte and nanofiltration membrane technology, which is applied in general water supply conservation, chemical instruments and methods, membrane technology, etc., can solve the problems of large-scale preparation of unfavorable polyelectrolyte nanofiltration membranes, cumbersome preparation and introduction process, and decline in interception performance , to achieve the effect of broad-scale application prospects, breakthrough limitations, and improved retention rate

Active Publication Date: 2020-11-27
DEZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although this method has a significant effect, the introduction of nanomaterials usually causes defects in the separation layer, which reduces the interception performance while increasing the water flux, and the preparation and introduction of nanomaterials are cumbersome, which also increases the production efficiency. The cost is not conducive to the large-scale preparation of polyelectrolyte nanofiltration membranes

Method used

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  • Method for improving water flux of polyelectrolyte nanofiltration membrane

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Embodiment 1

[0026] The present embodiment provides a kind of method that improves polyelectrolyte nanofiltration membrane water flux, and this method is carried out according to the following steps:

[0027] (1) Preparation of polyelectrolyte nanofiltration membrane A with amino and imino groups: based on polyacrylonitrile (PAN) ultrafiltration membrane, polyethyleneimine (PEI) as polycation, polystyrene sodium sulfonate (PSS ) is a polyanion, using glutaraldehyde (GA) as a cross-linking agent, using the static adsorption layer-by-layer self-assembly method, first immerse the PAN ultrafiltration substrate in 1g / L PEI aqueous solution for 20 minutes, then take it out and rinse it off with water. Adsorbed PEI aqueous solution, then immerse it in 2g / L PSS aqueous solution for 20 minutes, then take out water to rinse off the unadsorbed PSS aqueous solution, and alternately adsorb 3 times in this way, and then immerse the obtained membrane material in 0.1M GA aqueous solution After taking it o...

Embodiment 2

[0031] Polyelectrolyte nanofiltration membrane is processed with the method of embodiment 1, and its difference is only that step (1) replaces PEI aqueous solution with 2g / L polyallylamine hydrochloride aqueous solution, prepares the polyelectrolyte nanofiltration membrane with amino hydrochloride group Polyelectrolyte nanofiltration membrane B; step (3) adopts polyelectrolyte nanofiltration membrane B.

Embodiment 3

[0033] The polyelectrolyte nanofiltration membrane is treated with the method of Example 1, the only difference being that the oxidative solution configured in step (2) is a sodium chlorite solution; step (3) is soaked in a sodium chlorite solution.

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Abstract

The invention belongs to the technical field of water treatment membranes, and discloses a method for improving the water flux of a polyelectrolyte nanofiltration membrane, which comprises the following steps: soaking the polyelectrolyte nanofiltration membrane into an oxidizing solution; after taking out, washing the polyelectrolyte nanofiltration membrane with water to remove the residual oxidizing solution to obtain a membrane sample; wherein the polyelectrolyte nanofiltration membrane contains amido and imino and / or amido hydrochloride groups, and the oxidizing solution is at least one ofa sodium hypochlorite solution, a sodium chlorite solution and a hydrogen peroxide solution. According to the invention, the rejection rate of multivalent anionic salt and the water flux of the nanofiltration membrane can be improved at the same time, so that the application performance of the polyelectrolyte nanofiltration membrane is remarkably improved; meanwhile, the negative charge density ofthe surface of the membrane can be increased, and the electrostatic repulsion force between the surface of the membrane and the polyvalent anionic salt is improved, so that the rejection rate of thepolyelectrolyte nanofiltration membrane can still be kept or even improved after oxidation treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, and in particular relates to a post-treatment method for polyelectrolyte nanofiltration membranes. [0002] technical background [0003] Polyelectrolyte nanofiltration membrane has the advantages of controllable and adjustable surface properties and structure, and can selectively separate molecules and ions of different sizes (multivalent ions, dye molecules, etc.) by effectively adjusting the preparation conditions; it can be widely used in tap water purification , hard water softening, food processing, sewage treatment and medicine and other fields, has broad application prospects. Such nanofiltration membranes are usually obtained by layer-by-layer self-assembly of polyelectrolytes with different charges on the surface of porous substrates. The water flux of nanofiltration membranes is a key indicator of its application performance evaluation. It is closely related to the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00C02F1/44
CPCB01D61/027B01D67/0002C02F1/442Y02A20/131
Inventor 李强张娜闫婷婷李春辉许士才王吉华
Owner DEZHOU UNIV
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