Mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof

A layer-by-layer self-assembly, polyelectrolyte technology, applied in the field of separation membranes, can solve the problems of acid and alkali resistance, insufficient stability of nanofiltration membranes, and achieve high salt rejection rate, improved chemical stability, and high chemical stability. Effect

Active Publication Date: 2020-07-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanofiltration membrane of the present invention uses a mixed solution of polydopamine / polyethyleneimine and a polyanion electrolyte solution, and undergoes layer-by-layer self-assembly technology to cyclically coat and modify the surface of the base membrane for 1 to 3 times, and finally undergoes a cross-linking reaction. It is obtained after preparation; the preparation process is simple, the conditions are mild, and it has high rejection rate, strong surface hydrophilicity, anti-pollution and strong chemical stability, which can solve the problem of nanofiltration prepared by traditional layer-by-layer self-assembly. Membrane stability is insufficient, and it is not resistant to acid and alkali

Method used

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  • Mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof
  • Mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof
  • Mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof

Examples

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Embodiment 1

[0040] A mussel biomimetic assisted polyelectrolyte layer-by-layer self-assembled nanofiltration membrane, the preparation process of which specifically includes the following steps:

[0041] (1) The polyethersulfone ultrafiltration membrane was wetted with 50% ethanol for 5 minutes, and then rinsed with deionized water for 3 times, each time for 5 minutes;

[0042] (2) Prepare a Tris buffer solution with a pH of 8.5, and add CuSO 4 with H 2 o 2 ; Dopamine and polyethyleneimine are successively dissolved in Tris buffer solution, and the preparation concentration of dopamine and polyethyleneimine is 2g / L;

[0043] (3) Sodium polystyrene sulfonate is dissolved in water and sodium chloride is added, and the pH of the mixed solution is adjusted to 2 after stirring evenly. Wherein, the concentration of sodium polystyrene sulfonate is 1.03g / L, and the concentration of sodium chloride is 0.5mol / L;

[0044] (4) Fix the base film after the wetting treatment in a reaction device tha...

Embodiment 2

[0048] The preparation process of the nanofiltration membrane described in this embodiment is the same as that of Example 1, except that polydopamine / polyethyleneimine and sodium polystyrene sulfonate are alternately repeated, that is, in the present embodiment, step (4) and (5) were repeated twice, and then step (4) was repeated once; finally, the obtained membrane was soaked with 0.1% glutaraldehyde for 10 min.

Embodiment 3

[0050] The preparation process of the nanofiltration membrane described in this embodiment is the same as that of Example 1, except that polydopamine / polyethyleneimine and sodium polystyrene sulfonate are alternately repeated, that is, in the present embodiment, step (4) and (5) were repeated three times, and finally, the obtained membrane was soaked with 0.1% glutaraldehyde for 10 min.

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Abstract

The invention discloses a mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof. The nanofiltration membrane is prepared by circularly coating and modifying the surface of a base membrane with a polydopamine / polyethyleneimine mixed solution and a polyanion electrolyte solution for 1-3 times by virtue of a layer-by-layer self-assemblytechnology, and finally carrying out cross-linking reaction. Polydopamine and polyethyleneimine with high hydrophilicity are adopted, both may form a covalent bond, a stable coating is formed on the surface of the membrane; after performing coating modification, coating modification is carried out by adopting sodium polystyrenesulfonate with negative electricity, sodium polystyrenesulfonate and positively charged polyethyleneimine can be subjected to electrostatic adsorption, and benzene rings in molecules of sodium polystyrenesulfonate and benzene rings in molecules of polydopamine have a pi-pi stacking effect so that the stability of the coating is improved, coating is more uniform, and the prepared nanofiltration membrane is good in hydrophilicity, high in rejection rate, high in pollution resistance and high in chemical stability.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a mussel biomimetic assisted polyelectrolyte layer-by-layer self-assembly nanofiltration membrane and its application. Background technique [0002] Nanofiltration (NF) is a pressure-driven membrane separation technology between reverse osmosis (RO) and ultrafiltration (UF). The pore size of the nanofiltration membrane is generally below 2nm, and the average molecular weight cut-off (MWCO) is 200-1000Da. Nanofiltration technology has broad application prospects in the fields of purification of groundwater and surface water, reuse of urban sewage, treatment of industrial wastewater such as printing, dyeing and petrochemical, drug separation, food concentration, etc., and can also be used as pretreatment for seawater desalination. Compared with reverse osmosis membranes, the main characteristics of nanofiltration membranes are low cut-off of monovalent ions, high cut-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/62B01D71/60B01D71/28B01D69/02B01D67/00B01D61/02B01D61/08C02F1/44
CPCB01D61/027B01D61/08B01D67/0002B01D67/0006B01D67/0088B01D67/0093B01D69/02B01D71/28B01D71/60B01D71/62B01D71/82C02F1/442
Inventor 赵姗姗宋菲孟凡刚
Owner SUN YAT SEN UNIV
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