A lignin-based polyelectrolyte nanofiltration membrane and preparation method thereof

A polyelectrolyte, lignin-based technology, applied in the field of polyelectrolyte nanofiltration membrane and its preparation, can solve the problem that it cannot be directly used as a raw material for membrane production, achieve broad scale application prospects, improve anti-pollution ability, and reduce environmental pollution. Effect

Active Publication Date: 2022-05-06
DEZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lignin itself is difficult to dissolve in water under neutral conditions, which prevents it from being directly used as a raw material for membrane production.
There is currently no report on the development of lignin as a raw material for the preparation of polyelectrolyte membranes

Method used

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  • A lignin-based polyelectrolyte nanofiltration membrane and preparation method thereof
  • A lignin-based polyelectrolyte nanofiltration membrane and preparation method thereof
  • A lignin-based polyelectrolyte nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of polyelectrolyte and sodium lignosulfonate aqueous solution: according to the mass concentration of 1g / L, polyethyleneimine is dissolved in deionized water, and it is used as polyethyleneimine aqueous solution after dissolving evenly; according to the mass concentration of 1g / L Sodium lignosulfonate with a sulfonation degree of 30% is dissolved in deionized water, and after being uniformly dissolved, it is used as an aqueous solution of sodium lignosulfonate for later use;

[0040] (2) Preparation of cross-linking agent aqueous solution: according to the molar concentration of 0.1mol / L, glutaraldehyde was dissolved in deionized water, and after dissolving evenly, it was used as glutaraldehyde aqueous solution for subsequent use;

[0041](3) Raw materials for brushing: Brush the surface of the polysulfone ultrafiltration membrane with a soft brush in the following order: polyethyleneimine aqueous solution / glutaraldehyde aqueous solution / sodium lignosulfo...

Embodiment 2

[0044] A lignin-based polyelectrolyte nanofiltration membrane was prepared according to the method of Example 1, the only difference being that polyallylamine hydrochloride was used as the positively charged polyelectrolyte.

Embodiment 3

[0046] The lignin-based polyelectrolyte nanofiltration membrane was prepared according to the method of Example 1, the only difference being that polydiallyldimethylammonium chloride was used as the positively charged polyelectrolyte.

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Abstract

The invention belongs to the technical field of water treatment membranes, and discloses a lignin-based polyelectrolyte nanofiltration membrane and a preparation method thereof. The surface of the ultrafiltration membrane is brushed in the following order: positively charged polyelectrolyte aqueous solution / crosslinking agent aqueous solution / Sodium lignosulfonate aqueous solution / positive polyelectrolyte aqueous solution / sodium lignosulfonate aqueous solution; each layer is brushed onto the substrate surface and kept for 5‑20 minutes; and rinsed with water except for the brushing of the crosslinking agent aqueous solution ; Finally, the obtained polyelectrolyte nanofiltration membrane is placed at room temperature for a period of time and then soaked in water for preservation. In the present invention, sodium lignosulfonate is developed as a raw material for preparing polyelectrolyte nanofiltration membranes, which improves the utilization rate of lignin, and significantly improves the hydrophilicity of the membrane surface and the penetration of water molecules in the polyelectrolyte separation layer. The preparation process is simple, the operability is strong, the process conditions are easy to control, and it has broad prospects for large-scale application.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, and in particular relates to a polyelectrolyte nanofiltration membrane and a preparation method thereof. [0002] technical background [0003] Polyelectrolyte nanofiltration membranes have the advantages of easy regulation of surface properties and structure, and the selective separation of molecules and ions of different sizes (multivalent ions, dye molecules, etc.) can be achieved by effectively adjusting the preparation conditions. It can be widely used in tap water purification, hard water softening, food processing, sewage treatment, medicine and other fields, and 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. Moreover, compared with the traditional polyamide nanofiltration membrane, the polyelectrolyte nanofiltration membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D67/00B01D71/74C02F1/44
CPCB01D61/027B01D67/0002B01D71/74C02F1/442B01D2325/36
Inventor 李强张娜李正华王吉华闫婷婷
Owner DEZHOU UNIV
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