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Nanofiltration membrane, preparation method and application thereof

A nanofiltration membrane and microfiltration membrane technology, applied in the field of materials, can solve the problems of low filtration flux and slow diffusion, and achieve the effect of ultra-high separation water flux, high retention rate, and good mechanical support

Inactive Publication Date: 2020-09-15
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow diffusion of polymeric amine monomers, it is difficult to reduce the thickness of electropositive nanofiltration membranes obtained by interfacial polymerization on traditional ultrafiltration membranes to less than 100 nanometers, and the corresponding filtration flux is very low.

Method used

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  • Nanofiltration membrane, preparation method and application thereof
  • Nanofiltration membrane, preparation method and application thereof
  • Nanofiltration membrane, preparation method and application thereof

Examples

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preparation example Construction

[0040] As another aspect of the technical solution of the present invention, it also relates to a preparation method of a nanofiltration membrane, which includes:

[0041] An ultrafine nanofiber layer is arranged on the microfiltration membrane to obtain an ultrafine nanofiber / microfiltration membrane composite substrate;

[0042] The polyethylenimine monomer and the acid chloride monomer are subjected to interfacial polycondensation reaction on the surface of the ultrafine nanofiber / microfiltration membrane composite substrate, followed by heat treatment to obtain the nanofiltration membrane.

[0043]The preparation principle of the nanofiltration membrane of the present invention may lie in that ultrafine nanofibers play a key role in the formation process and separation performance of the ultrathin active separation layer. First, the ultra-fine nanofibers run through the polyamide layer and play a good supporting role, making the ultra-thin polyamide layer have pressure res...

Embodiment 1

[0076] Suction filter the carbon nanotubes onto a commercial polyethersulfone microfiltration membrane with a density of 2.3 μg cm -2 . Deposit polyethyleneimine with a weight average molecular weight of 600 on the carbon nanotube substrate with a concentration of 5 mg ml -1 The solution on the surface of the membrane was soaked for 60s after soaking in aqueous solution of polyethyleneimine, and then the surface of the membrane was soaked in a concentration of 0.3mg ml -1 In the 1,3,5-trimesoyl chloride hexane solution, after reacting at 20°C for 60s, soak the membrane in hexane to wash away excess 1,3,5-trimesoyl chloride. Finally, the membrane was heated at 60 °C for 25 min and stored in deionized water.

[0077] The nanofiltration membrane prepared above was used with 1000ppm MgCl 2 Aqueous solution test, the test temperature is 28°C, the operating pressure is 5bar, and the flux is 30L m -2 h -1 bar -1 , The rejection rate is 96%. The membrane is sensitive to 1000ppm...

Embodiment 2

[0079] Suction filter the carbon nanotubes onto a commercial polyethersulfone microfiltration membrane with a density of 2.3 μg cm -2 . Deposit polyethyleneimine with a weight average molecular weight of 600 on the carbon nanotube substrate with a concentration of 5 mg ml -1 The solution on the surface of the membrane was soaked in polyethyleneimine aqueous solution for 60s, and then the surface of the membrane was soaked in a concentration of 0.6mg ml -1 In the 1,3,5-trimesoyl chloride hexane solution, after reacting at 20°C for 60s, soak the membrane in hexane to wash away excess 1,3,5-trimesoyl chloride. Finally, the membrane was heated at 60 °C for 25 min and stored in deionized water.

[0080] The nanofiltration membrane prepared above was used with 1000ppm MgCl 2 Aqueous solution test, the test temperature is 28°C, the operating pressure is 5bar, and the flux is 27L m -2 h -1 bar -1 , The rejection rate is 97%. The membrane is sensitive to 1000ppm CaCl 2 The reje...

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Abstract

The invention discloses a nanofiltration membrane, a preparation method and application thereof. The nanofiltration membrane comprises a support bottom membrane and an active separation layer arrangedon the support bottom membrane, wherein the active separation layer has an interpenetrating network structure, and the interpenetrating network structure is mainly formed by interpenetrating polyamide formed by an interfacial polycondensation reaction of a polyethyleneimine monomer and an acyl chloride monomer with ultrafine nanofibers. The preparation method comprises the following steps: arranging an ultrafine nano-fiber layer on a micro-filtration membrane to prepare an ultrafine nano-fiber / micro-filtration membrane composite substrate; and carrying out an interfacial polycondensation reaction on a polyethyleneimine monomer and an acyl chloride monomer on the surface of the superfine nanofiber / micro-filtration membrane composite substrate, and carrying out heat treatment to obtain thenano-filtration membrane. The preparation method of the nanofiltration membrane is simple, and the obtained nanofiltration membrane has high flux and high salt rejection performance, so that the desalination energy consumption cost is reduced, and the nanofiltration membrane has a wide application prospect in the aspects of seawater desalination pretreatment, water softening and the like.

Description

technical field [0001] The invention relates to a nanofiltration membrane, in particular to an ultra-high flux nanofiltration membrane with a novel structure and a preparation method thereof, as well as the application of the nanofiltration membrane in the field of water treatment, belonging to the field of material technology. Background technique [0002] The multivalent metal ions in the water body will cause harm to human health, and the scale deposited by calcium and magnesium ions will also cause serious problems such as pipeline blockage and heat exchange degradation on household and industrial equipment, so the removal of multivalent cations in water is very important. Necessary. Compared with the traditional lime softening and ion exchange resin methods, the membrane separation method has great advantages in water softening due to its high separation efficiency and green characteristics. However, membrane separation requires external pressure to drive filtration, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/10B01D61/02B01D67/00C02F1/44C02F103/08
CPCB01D61/027B01D67/0006B01D69/10B01D71/56B01D71/68B01D2325/24C02F1/442C02F2103/08Y02A20/131
Inventor 靳健朱玉长王祯宜
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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