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A kind of positively charged composite nanofiltration membrane, its preparation method and application

A composite nanofiltration membrane, positively charged technology, applied in the field of membrane separation, can solve problems such as poor separation effect, and achieve the effect of improving positive charging strength, excellent water flux, and reducing steric hindrance effect

Active Publication Date: 2022-03-15
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethyleneimine does not contain quaternary ammonium groups, and the ratio of primary, secondary and tertiary amine groups on its molecular chain is generally 1:2:1. Polyethyleneimine is used as a polyamine positively charged polyelectrolyte The prepared nanofiltration membrane has poor separation effect on multivalent cations and cationic small molecules

Method used

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  • A kind of positively charged composite nanofiltration membrane, its preparation method and application
  • A kind of positively charged composite nanofiltration membrane, its preparation method and application
  • A kind of positively charged composite nanofiltration membrane, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This example is the preparation of the positively charged composite nanofiltration membrane sample 1, wherein the positively charged nanofiltration selective layer in the positively charged composite nanofiltration membrane sample 1 is provided with positively charged groups by polyethyleneimine.

[0039] Prepare a 3wt% polyethyleneimine aqueous phase solution, stir until it is completely dissolved, and use it as the first phase;

[0040] Prepare 0.05wt% trimesoyl chloride organic phase solution, the organic solvent is n-hexane, as the second phase;

[0041] Fix the polyethersulfone base membrane on the self-made PTFE interfacial polymerization mold, pour a certain amount of the first phase solution to immerse the surface of the membrane, make it contact with the surface for 100 seconds, take it out, and then roll the polyethersulfone support membrane with a rubber roller , remove the excess solution, pour the same amount of the second phase, soak for 100 seconds, rinse...

Embodiment 2

[0043] This example is the preparation of the positively charged composite nanofiltration membrane sample 2, wherein the positively charged nanofiltration selective layer in the positively charged composite nanofiltration membrane sample 2 is provided with positively charged groups by quaternized polyethyleneimine.

[0044] The method for quaternizing polyethyleneimine in this embodiment: use propylene oxide to tertiary aminate the raw material polyethyleneimine, and then use benzyl chloride to quaternize the tertiary-aminated polyethyleneimine.

[0045] Prepare a 3wt% aqueous solution of quaternized polyethyleneimine, stir until it is completely dissolved, and use it as the first phase;

[0046] Prepare 0.05wt% trimesoyl chloride organic phase solution, the organic solvent is n-hexane, as the second phase;

[0047] Fix the polyethersulfone base membrane on the self-made PTFE interfacial polymerization mold, pour a certain amount of the first phase solution to immerse the surf...

Embodiment 3

[0049] This example is the preparation of the positively charged composite nanofiltration membrane sample 3, wherein the positively charged nanofiltration selective layer in the positively charged composite nanofiltration membrane sample 3 is provided with positively charged groups by quaternized polyethyleneimine.

[0050] In this embodiment, the method for quaternizing polyethyleneimine is the same as that in Embodiment 2.

[0051] The preparation mass fraction is the aqueous phase solution of the quaternized polyethyleneimine of 3wt%, the DMAP of 0.01wt%, the triethylamine of 0.03wt%, the sodium dodecylbenzene sulfonate of 0.005wt%, stir, until complete dissolved, as the first phase;

[0052] Prepare 0.05wt% trimesoyl chloride organic phase solution, the organic solvent is n-hexane, as the second phase;

[0053] Fix the polyethersulfone base membrane on the self-made PTFE interfacial polymerization mold, pour a certain amount of the first phase solution to immerse the surf...

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Abstract

The invention discloses a positively charged composite nanofiltration membrane. The positively charged composite nanofiltration membrane includes a base membrane and a positively charged nanofiltration selective layer. The positively charged nanofiltration selective layer is made of quaternized polyethylene The amine provides positively charged groups, and the quaternization rate of the quaternized polyethyleneimine is 1-50%. In the present invention, polyethyleneimine is first modified by quaternization, which improves the positive charge strength of polyethyleneimine and enhances the hydrophilicity of the material, and then uses quaternized polyethyleneimine as the amine The positively charged composite nanofiltration membrane was prepared by interfacial polymerization reaction between similar reactive monomers and trimesoyl chloride. The positively charged composite nanofiltration membrane of the present invention has moderate water flux and excellent retention rate of magnesium chloride and sodium chloride. Compared with the unmodified polyethyleneimine nanofiltration membrane, it shows better multivalent cation filtration efficiency and Better hydrophilicity. The positively charged composite nanofiltration membrane of the invention has stable structure, strong controllability, simple membrane making method and excellent separation performance.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a positively charged composite nanofiltration membrane, its preparation method and application. Background technique [0002] The shortage of water resources and the pollution of water bodies have become increasingly serious social problems. Therefore, it is necessary to strengthen the protection and rational use of water resources, develop brackish water and seawater desalination technology, and recycle and reuse domestic and industrial wastewater. Membrane separation technology, as a high-efficiency, energy-saving and environmentally-friendly water treatment technology, has become an important means to solve the shortage of water resources and water pollution. Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis. Usually, the molecular weight cut-off of nanofiltration membrane is 200-1000Da, and the effective membrane pore s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/36B01D71/42B01D71/68
CPCB01D71/68B01D71/42B01D71/36B01D69/12B01D69/02B01D67/0006B01D61/027B01D2325/16B01D2325/36
Inventor 唐娜黑云皓项军张蕾杜威王松博程鹏高张建平
Owner TIANJIN UNIV OF SCI & TECH
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