An intelligent responsive graphene-based separation membrane for the separation of mixed molecules and its preparation method

A graphene-based molecular separation technology, applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problem of selective separation of mixed ions/molecules, and achieve easy large-scale preparation, easy control of thickness, The effect of good stability

Active Publication Date: 2020-11-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the separation membrane obtained by combining graphene with different organic / inorganic materials can improve the flux and rejection rate of the separation membrane, and greatly improve the functionality, there are still some problems, such as only the Separation of a single solute, unable to selectively separate more than two mixed ions / molecules

Method used

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  • An intelligent responsive graphene-based separation membrane for the separation of mixed molecules and its preparation method
  • An intelligent responsive graphene-based separation membrane for the separation of mixed molecules and its preparation method
  • An intelligent responsive graphene-based separation membrane for the separation of mixed molecules and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 50 mg of graphene oxide GO into 50 mL of N,N-dimethylformamide, and sonicate to obtain a GO dispersion with a concentration of 1 mg / mL.

[0026] According to the mass ratio of 100:1, 5.659g of N-isopropylacrylamide and 0.056g of azobisisobutyronitrile were added to the GO dispersion and stirred thoroughly to obtain a mixed solution. The mixed solution was transferred to a Schlenk bottle, and the moisture and oxygen in the system were removed. Then put the Schlek bottle in an oil bath heated to 65°C and stir for 12 hours. After the reaction, wash three times with 300 mL of deionized water and 300 mL of ethanol, and centrifuge at a centrifugal speed of 10,000 rpm for 1 hour to remove unreacted N-isopropylacrylamide monomer and ungrafted GO in the reaction system. poly(N-isopropylacrylamide). Finally, the obtained precipitate was freeze-dried for 48 hours under a vacuum of 0.03 mbar to obtain GO / poly(N-isopropylacrylamide) nanocomposites. 20 mg of GO / poly(N-iso...

Embodiment 2

[0028] Disperse 100 mg of rGO into 20 mL of dimethyl sulfoxide and sonicate to obtain a rGO dispersion with a concentration of 5 mg / mL. According to the mass ratio of 100:0.5, 7.206 g of acrylic acid and 0.036 g of azobisisoheptanonitrile were added to the rGO dispersion liquid and stirred thoroughly to obtain a mixed liquid. The mixed solution was transferred to a Schlenk bottle, and the moisture and oxygen in the system were removed. Then put the Schlek bottle in an oil bath heated to 55°C and stir for 6 hours. After the reaction, wash three times with 300 mL deionized water and 300 mL ethanol, and centrifuge at a centrifugal speed of 10,000 rpm for 1 hour to remove unreacted acrylic acid monomer and polyacrylic acid not grafted to rGO in the reaction system. Finally, the obtained precipitate was freeze-dried under a vacuum of 0.03 mbar for 48 hours to obtain rGO / polyacrylic acid nanocomposites. Take 100 mg of rGO / polyacrylic acid nanocomposite and disperse it in 50 mL of ...

Embodiment 3

[0030]Disperse 10 mg of graphene into 100 mL of N-methylpyrrolidone, and perform ultrasonic treatment to obtain a graphene dispersion with a concentration of 0.1 mg / mL. According to the mass ratio of 100:1.5, 8.365g of N-isopropylacrylamide-co-acrylic acid and 0.125g of dimethyl azobisisobutyrate were added to the graphene dispersion and fully stirred to obtain a mixed solution. The mixed solution was transferred to a Schlenk bottle, and the moisture and oxygen in the system were removed. Then the reaction bottle was placed in an oil bath heated to 70°C and stirred for 24 hours. After the reaction, wash three times with 300mL deionized water and 300mL ethanol and centrifuge at a centrifugal speed of 10,000 rpm for 1 hour to remove unreacted N-isopropylacrylamide-co-acrylic acid monomer and unreacted N-isopropylacrylamide-co-acrylic acid monomer in the reaction system Poly(N-isopropylacrylamide-co-acrylic acid) grafted onto graphene. Finally, the obtained precipitate was free...

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Abstract

The invention discloses an intelligent responsive graphene-based separation membrane for separation of mixed molecules and a preparation method thereof, and belongs to the technical field of separation membrane preparation. The present invention obtains intelligent polymer composite graphene nanosheets through the in-situ growth of responsive polymer monomers on graphene sheets, and then uses vacuum filtration technology to successfully prepare a nanosheet that is highly sensitive to external stimuli and can be produced by Graphene-based separation membranes, whose pore size is controlled by external stimulation and have good mechanical properties and environmental stability, can filter and separate mixed substances containing more than three different molecular diameters by adjusting the temperature or pH value of the solution. Moreover, the thickness of the separation membrane provided by the invention is easy to control and easy to be prepared on a large scale.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation, and in particular relates to an intelligent responsive polymer / graphene composite separation membrane for the separation of mixed molecules and a preparation method thereof. Background technique [0002] The layer-by-layer stacked nanosheets in the graphene film provide a two-dimensional capillary channel for the low-friction passage of water fluid, and its rich oxygen-containing functional group network is conducive to the modification or recombination of guest molecules. In recent years, graphene-based separation membranes have shown excellent selectivity for molecules and ions in solution and gas mixtures. In order to improve the separation performance of graphene-based separation membranes, researchers have done a lot of research work, such as compounding graphene oxide (GO) with copper hydroxide nanowires, and then dissolving the nanowires, without affecting the rejec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/02B01D71/16B01D71/40B01D71/50B01D71/56
CPCB01D67/0079B01D69/02B01D69/12B01D71/025B01D71/16B01D71/40B01D71/50B01D71/56B01D2325/22B01D2325/0282
Inventor 赵勇王女刘敬崇
Owner BEIHANG UNIV
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