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A method for preparing a high-throughput solvent-resistant organic/inorganic hybrid composite membrane doped with aminated graphene quantum dots

A technique of aminated graphene and hybrid compounding, which is applied in the field of membrane separation, can solve the problems of low flux, achieve large specific surface area, improve stability, and ensure stability

Active Publication Date: 2021-05-04
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the nanofiltration membrane facing the aqueous solution system in the prior art is difficult to be used in the organic solution system, and the organic solvent-resistant nanofiltration membrane prepared by the phase inversion method has a low flux, and proposes a doped A method for preparing a high-throughput solvent-resistant organic / inorganic hybrid composite film of aminated graphene quantum dots (abbreviated as af-GQDs in this field), the prepared organic solvent-resistant organic / inorganic hybrid composite film has excellent Solvent resistance, and has high flux, salt rejection rate and dye removal rate, which greatly improves the performance of the membrane

Method used

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  • A method for preparing a high-throughput solvent-resistant organic/inorganic hybrid composite membrane doped with aminated graphene quantum dots

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0071] The preparation and purification steps of af-GQDs nanoparticles are as follows,

[0072] Step 1: preparation of graphene oxide;

[0073] Mix a certain amount of graphite powder, concentrated sulfuric acid and sodium nitrate evenly, stir at a temperature of 5°C for 30 minutes, then add an appropriate amount of potassium permanganate, keep the temperature below 20°C, and continue stirring for 2 hours, then the temperature of the mixture Keep at 35°C, keep stirring for 5 hours, then add an appropriate amount of deionized water, raise the temperature of the mixture to 95°C, continue stirring for 40 minutes, add a large amount of deionized water to terminate the reaction, and then add an appropriate amount of hydrogen peroxide solution, at this time The color of the mixture changed from brown-black to bright yellow;

[0074] Step 2: the purification of graphene oxide;

[0075] Add dilute hydrochloric acid to the above mixture to wash and centrifuge, retain the solid, and d...

Embodiment 1

[0091] In Example 1, the difference between the aqueous phase solution and Comparative Example 1: af-GQDs were added to the aqueous phase solution.

[0092] Dissolve the small molecule diamine compound and a certain amount of af-GQDs in deionized water, the mass concentration of the small molecule diamine compound is 2.0%, the mass concentration of af-GQDs is 0.01%, and the aqueous phase monomer solution.

[0093] The oil phase monomer solution is the same as that of Comparative Example 1.

[0094] The method of embodiment 1 is as follows:

[0095] Step 1: Pour a certain amount of af-GQDs-containing aqueous phase monomer solution on the surface of the ultrafiltration basement membrane and keep it for 30 seconds, then pour out the aqueous phase and let it dry for 30 seconds.

[0096] Step 2: Pour a certain amount of oil phase monomer solution on the surface of the ultrafiltration basement membrane that has absorbed the water phase monomer and keep it for 30s, then pour off th...

Embodiment 2

[0102] The differences from Comparative Example 1 include: the addition of af-GQDs to the aqueous phase solution, and the addition of chemical crosslinking and solvent activation steps after interfacial polymerization.

[0103] The aqueous monomer solution is the same as in Example 1.

[0104] The oil phase monomer solution is the same as that of Comparative Example 1.

[0105] Hexamethylenediamine (HDA) was dissolved in isopropanol to prepare a cross-linking agent solution with a mass concentration of 10%.

[0106] The activation solvent is N,N-dimethylformamide (DMF).

[0107] The method of embodiment 2 is as follows:

[0108] Step one to step four are identical with embodiment 1;

[0109] Step 5: Put the organic / inorganic hybrid film doped with af-GQDs obtained in step 4 into a cross-linking agent to chemically cross-link for 16 hours to obtain a cross-linked modified af-GQDs-doped organic / inorganic solvent-resistant organic / inorganic film hybrid film;

[0110] Step 6:...

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Abstract

The invention discloses a method for preparing a doped aminated graphene quantum dot high-flux solvent-resistant organic / inorganic hybrid composite film, the prepared composite film and the application of the film. The preparation method of the composite membrane comprises the step of interfacial polymerization reaction, chemical cross-linking step and solvent activation step. The invention significantly improves the separation performance and solvent resistance performance of the membrane by adding aminoated graphene quantum dots into the interface polymerization monomer solution, and shortens the membrane forming time by increasing the crosslinking and solvent activation temperature. The surface of the aminated quantum dot has a large number of amino groups, which can react with the organic phase monomer to form a strong covalent bond, which not only improves the performance of the film, but also significantly improves the stability of the quantum dot in the film. The preparation process of the invention is simple, and has good application prospects in the field of separation of organic solution systems and the field of water treatment containing organic solvents.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a method for preparing a high-throughput solvent-resistant organic / inorganic hybrid composite membrane doped with aminated graphene quantum dots (af-GQDs), the prepared composite membrane and the composite membrane. Membrane application. Background technique [0002] Nanofiltration (NF) is a separation technology between reverse osmosis (RO) and ultrafiltration (UF). With its unique separation performance, it is widely used in many fields such as water treatment, food, medicine, printing and dyeing, chemical industry, etc. . At present, commercialized nanofiltration membranes are mainly used in aqueous solution systems, but many industrial separation processes require the use of a large amount of organic solvents, which requires nanofiltration membranes to have good resistance to organic solvents. The development of high-performance organic solvent-resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/40B01D69/12B01D67/00C01B32/184B82Y30/00B82Y40/00
CPCB01D67/0079B01D69/12B01D71/40B82Y30/00B82Y40/00C01P2004/10C01P2004/51C01P2004/60C01P2004/64C01P2004/80
Inventor 苏保卫李树轩许胜杰王振远杨珊珊李灿
Owner OCEAN UNIV OF CHINA
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