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Nanofiltration composite membrane for selective ion separation and preparation method thereof

A technology of ion separation and selectivity, which is applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of easy dissociation of GO membrane, poor ion selectivity, and unstable environmental influence, so as to improve separation efficiency, Promote the performance of the application

Active Publication Date: 2021-05-07
FANGDA CARBON NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although GO has many excellent properties suitable for water purification applications, pure GO membranes are still far away from practical applications.
This is mainly because the GO membrane has some fatal shortcomings that are difficult to solve: for example, its nanopore channel, that is, the distance between GO sheets, is very unstable due to the influence of the environment, the ion selectivity is relatively poor under pressure filtration conditions, and the GO membrane is easy to dissociate in long-term operation in aqueous solution. and the inability to achieve large-area film formation, etc.

Method used

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  • Nanofiltration composite membrane for selective ion separation and preparation method thereof
  • Nanofiltration composite membrane for selective ion separation and preparation method thereof
  • Nanofiltration composite membrane for selective ion separation and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] A preparation method of a nanofiltration composite membrane for selective ion separation, comprising the steps of:

[0055] (1) Preparation of the middle porous layer of the nanofiltration composite membrane for selective ion separation: 20wt.% polysulfone (PSF) solid particles and 80wt.% N-methylpyrrolidone (NMP) solution were mixed, heated and stirred at 50 °C for 6 h , to form a homogeneous and transparent PSF / NMP solution; the PSF / NMP solution was degassed in vacuum until no visible bubbles were present; the PSF / NMP solution was formed into a film on the pretreated non-woven substrate with a constant speed and thickness using an automatic film coater , the film thickness is controlled at 50 microns; immediately immerse the coated non-woven fabric in deionized water to solidify the PSF into a porous structure film, keep it for 24 hours, then take it out and dry it at 60 ℃ for 30 minutes in the air atmosphere for use;

[0056] (2) Prepare piperazine aqueous phase solu...

Embodiment 2

[0059] A preparation method of a nanofiltration composite membrane for selective ion separation, comprising the steps of:

[0060] (1) Preparation of the middle porous layer of the nanofiltration composite membrane for selective ion separation: 20wt.% polysulfone (PSF) solid particles and 80wt.% N-methylpyrrolidone (NMP) solution were mixed, heated and stirred at 50 °C for 6 h , to form a homogeneous and transparent PSF / NMP solution; the PSF / NMP solution was degassed in vacuum until no visible bubbles were present; the PSF / NMP solution was formed into a film on the pretreated non-woven substrate with a constant speed and thickness using an automatic film coater , the film thickness was controlled at 100 microns; the coated non-woven fabric was immediately immersed in deionized water to solidify the PSF into a porous structure film, kept for 24 h, and then taken out and dried at 80 °C for 10 min in the air atmosphere for use;

[0061] (2) Prepare piperazine aqueous phase soluti...

Embodiment 3

[0064] A preparation method of a nanofiltration composite membrane for selective ion separation, comprising the steps of:

[0065] (1) Preparation of the middle porous layer of the nanofiltration composite membrane for selective ion separation: 20wt.% polysulfone (PSF) solid particles and 80wt.% N-methylpyrrolidone (NMP) solution were mixed, heated and stirred at 50 °C for 6 h , to form a homogeneous and transparent PSF / NMP solution; the PSF / NMP solution was degassed in vacuum until no visible bubbles were present; the PSF / NMP solution was formed into a film on the pretreated non-woven substrate with a constant speed and thickness using an automatic film coater , the film thickness is controlled at 50 microns; immediately immerse the coated non-woven fabric in deionized water to solidify the PSF into a porous structure film, keep it for 24 hours, then take it out and dry it at 60 ℃ for 30 minutes in the air atmosphere for use;

[0066] (2) Prepare piperazine aqueous phase solu...

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Abstract

A nanofiltration composite membrane and a preparation method thereof belong to the technical field of water treatment membranes. The nanofiltration composite membrane includes three parts: a base support layer, an intermediate porous layer and an ultrathin separation layer; the ultrathin separation layer is composed of graphene oxide and polyamide. The size of the graphene oxide sheet is controlled within tens to hundreds of nanometers. In the present invention, the graphene oxide nanosheets are dispersed in the piperazine water phase, and then added to the nanofiltration membrane through in-situ interfacial polymerization reaction with the trimesoyl chloride oil phase, which can simultaneously improve the water flux and ion selection of the nanofiltration membrane sex.

Description

technical field [0001] The invention relates to a nanofiltration composite membrane with selective ion separation, more specifically, adding graphene oxide materials into the ultrathin separation layer of the nanofiltration membrane, and belongs to the technical field of water treatment membranes. Background technique [0002] Daily tap water usually contains calcium and magnesium metal ions. During long-term use, these ions will cause scaling or corrosion of water pipelines, thereby reducing their service life and increasing cleaning costs. The water softening process can effectively remove divalent calcium and magnesium ions. Traditional water softening methods include lime-soda ash method, electrodialysis method and ion exchange method. However, these methods will generate a large amount of intermediate products and increase the processing technology. In recent years, water treatment membranes have become the mainstream ion separation technology due to their advantages ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/62B01D71/02B01D69/12B01D67/00B01D61/02C02F1/44
CPCB01D61/027B01D67/0079B01D69/125B01D71/021B01D71/62B01D71/68B01D2311/268B01D2323/30B01D2325/36C02F1/442
Inventor 朱宏伟李启龙胡蕊蕊李虓郝相龙
Owner FANGDA CARBON NEW MATERIAL CO LTD
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