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A kind of high flux nanofiltration membrane, its preparation method and application

A nanofiltration membrane, high-throughput technology, applied in the field of materials, can solve the problems of restricting the sustainable development of water treatment and high production costs, improve wettability and uniformity of pore size distribution, reduce production costs, and change the interface position. Effect

Active Publication Date: 2022-03-08
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, both chromium hydroxide nanofibers and carbon nanotubes are biologically and environmentally toxic, and the production cost is high, which limits their sustainable development in water treatment

Method used

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  • A kind of high flux nanofiltration membrane, its preparation method and application
  • A kind of high flux nanofiltration membrane, its preparation method and application

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preparation example Construction

[0030] As another aspect of the technical solution of the present invention, it also relates to a method for preparing a high-throughput nanofiltration membrane, which includes:

[0031] A cellulose nanofiber layer is arranged on the microfiltration membrane support layer to obtain a cellulose nanofiber / microfiltration membrane composite bottom membrane;

[0032] The surface of the cellulose nanofiber / microfiltration membrane composite bottom membrane is used as the aqueous phase-oil phase interface of the aqueous solution containing polyamine monomers and salts and the organic solution containing polyacyl chlorides, and the polyamine monomers and polyacyl chlorides are The interfacial polymerization reaction is carried out at the interface, thereby forming an ultra-thin separation layer of polyamide on the surface of the cellulose nanofiber / microfiltration membrane composite bottom membrane, and then performing annealing treatment to obtain a high-flux nanofiltration membrane....

Embodiment 1

[0072] Cellulose nanofibers were deposited on a commercially available hydrophilic PTFE film at a deposition density of 20 μg / cm 2 After soaking for 120s in an aqueous solution containing piperazine (2.5mg / ml) and calcium chloride (5mg / ml), the solution on the surface of the composite bottom film was blotted dry, and then the surface of the composite bottom film was soaked in a concentration of 2mg / ml of 1 ,3,5- Trimellitic tricarboxylic hexane solution, reacted for 60s at a temperature of 25°C and a relative humidity of 60%, took it out, cleaned the membrane with n-hexane, and placed the membrane at 60°C for 30min , to obtain high-throughput nanofiltration membranes.

[0073] The high flux nanofiltration membrane prepared above uses 1000ppm Na 2 SO 4 Aqueous solution cross-flow test, the test temperature is 25°C, first reflux at 4bar pressure for 30min, and then test at 2bar pressure, the flux is 49.3Lm -2 h -1 bar -1 , The rejection rate is 96.1%.

Embodiment 2

[0075] Cellulose nanofibers were deposited on a commercially available hydrophilic PTFE film at a deposition density of 20 μg / cm 2After soaking for 120s in an aqueous solution containing piperazine (2.5mg / ml) and calcium chloride (10mg / ml), the solution on the surface of the composite bottom film was blotted dry, and then the surface of the composite bottom film was soaked in a concentration of 2mg / ml of 1 ,3,5- Trimellitic tricarboxylic hexane solution, reacted for 60s at a temperature of 25°C and a relative humidity of 60%, took it out, cleaned the membrane with n-hexane, and placed the membrane at 60°C for 30min , to obtain high-throughput nanofiltration membranes. For the SEM image of the surface of the high-throughput nanofiltration membrane obtained after interfacial polymerization in this example, please refer to figure 1 As shown, the SEM image of the surface of the cellulose nanofiber intermediate layer before interfacial polymerization can be found in figure 2 . ...

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Abstract

The invention discloses a high-throughput nanofiltration membrane, its preparation method and application. The preparation method includes: setting a cellulose nanofiber layer on the microfiltration membrane support layer to obtain a cellulose nanofiber / microfiltration membrane composite bottom membrane; using the surface of the cellulose nanofiber / microfiltration membrane composite bottom membrane as the Aqueous solution of amine monomer and salt and the water-oil phase interface of the organic solution containing polyacyl chloride, and make described polyamine monomer and polybasic acid chloride carry out interfacial polymerization reaction at described interface, thereby in described cellulose nanometer The fiber / microfiltration membrane composite bottom membrane forms a polyamide ultra-thin separation layer on the surface, and then undergoes annealing treatment to obtain a high-flux nanofiltration membrane. The high-flux nanofiltration membrane of the present invention improves the wettability and pore size distribution uniformity of the traditional bottom membrane, and also solves the biological toxicity problem caused by the chromium hydroxide nanofibers or carbon nanotubes in the past. The preparation method is relatively simple, and the high-flux , High salt interception performance reduces the cost of desalination energy consumption, and has industrial application value.

Description

technical field [0001] The invention relates to a nanofiltration membrane, in particular to a high-flux nanofiltration membrane with cellulose nanofibers as an intermediate layer 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] Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis. It mainly cuts off molecules with a molecular weight greater than 200 and divalent or high-valent salt ions. It saves energy due to its adjustable selectivity, high flux, and low operating pressure. It has great application prospects in sewage treatment and seawater desalination pretreatment. The current commercial nanofiltration membrane is mainly a composite membrane obtained by interfacial polymerization of polysulfone ultrafiltration membrane as a support layer with polyamines and polyacyl chlorides a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D69/12B01D69/02B01D67/00B01D61/00B01D71/56
CPCB01D69/105B01D69/12B01D69/02B01D67/0006B01D71/56B01D61/027
Inventor 朱玉长靳健
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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