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A kind of preparation method of graphene oxide composite nanofiltration membrane

A graphene composite and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of limited application, nanofiltration membrane preparation and performance, less involvement, and difficult dispersion, etc., to achieve high Hydrophilicity, increase flux and desalination effect, increase the effect of salt interception rate

Active Publication Date: 2015-11-04
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because graphene oxide is prone to agglomeration and is not easily dispersed in most polymers, the preparation of graphene oxide ultrafiltration membranes by phase inversion method limits its application in the preparation of separation membranes.
At the same time, the current research on graphene oxide is limited to ultrafiltration membranes, and the preparation and performance research of nanofiltration membranes is rarely involved.

Method used

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  • A kind of preparation method of graphene oxide composite nanofiltration membrane
  • A kind of preparation method of graphene oxide composite nanofiltration membrane
  • A kind of preparation method of graphene oxide composite nanofiltration membrane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] (1). The graphene oxide aqueous solution was prepared by the modified Hummmers method.

[0032] Put expandable graphite as raw material in a container, add concentrated sulfuric acid with a mass fraction of 98% to the expandable graphite, keep the temperature of the mixture at 0°C in an ice-water bath, then add potassium permanganate, when the temperature is lower than 20 Stir evenly under the condition of ℃, add 50ml of concentrated sulfuric acid for every 1g of expandable graphite, and the quality of potassium permanganate is twice that of expandable graphite.

[0033] Add ultrapure water to the above solution for dilution, heat it in a constant temperature water bath to 90-100°C, keep it for 30-40min, then add hydrogen peroxide solution with a mass fraction of 30%, and cool it to room temperature, the solution changes from brown to soil Yellow, the volume ratio of concentrated sulfuric acid: ultrapure water: hydrogen peroxide is 50:100:10.

[0034] Filter the above ...

Embodiment 2

[0040] (1). The graphene oxide aqueous solution was prepared by the modified Hummmers method.

[0041] Put expandable graphite as raw material in a container, add concentrated sulfuric acid with a mass fraction of 98% to the expandable graphite, keep the temperature of the mixture at 0°C in an ice-water bath, then add potassium permanganate, when the temperature is lower than 20 Stir evenly under the condition of ℃, add 60ml of concentrated sulfuric acid for every 1g of expandable graphite, and the quality of potassium permanganate is 3 times that of expandable graphite.

[0042] Add ultrapure water to the above solution for dilution, heat it in a constant temperature water bath to 90-100°C, keep it for 30-40min, then add hydrogen peroxide solution with a mass fraction of 30%, and cool it to room temperature, the solution changes from brown to soil Yellow pasty colloid, the volume ratio of concentrated sulfuric acid: ultrapure water: hydrogen peroxide is 50:200:20.

[0043] Fil...

Embodiment 3

[0049] (1). The graphene oxide aqueous solution was prepared by the modified Hummmers method.

[0050] Put expandable graphite as raw material in a container, add concentrated sulfuric acid with a mass fraction of 98% to the expandable graphite, keep the temperature of the mixture at 0°C in an ice-water bath, then add potassium permanganate, when the temperature is lower than 20 Stir evenly under the condition of ℃, add 75ml of concentrated sulfuric acid for every 1g of expandable graphite, and the quality of potassium permanganate is 4 times that of expandable graphite.

[0051] Add ultrapure water to the above solution for dilution, heat it in a constant temperature water bath to 90-100°C, keep it for 30-40min, then add hydrogen peroxide solution with a mass fraction of 30%, and cool it to room temperature, the solution changes from brown to soil Yellow pasty colloid, the volume ratio of concentrated sulfuric acid: ultrapure water: hydrogen peroxide is 50: 300: 40.

[0052]...

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Abstract

The invention relates to a preparation method of a graphene oxide composite nano filter membrane, and belongs to the technical field of separation membrane preparation. The preparation method of the graphene oxide composite nano filter membrane comprises the following steps: (1) preparing a graphene oxide water liquid; (2) preparing a graphene oxide cross linking liquid; and (3) preparing the graphene oxide composite nano filter membrane. The graphene oxide composite nano filter membrane provided by the invention has the characteristics that the surface of the membrane has a great deal of free carboxyl and hydroxy, the hydrophilicity is high, the flux is high, meanwhile, the charge on the surface of the membrane is negative, the salt cutting ratio is effectively improved, the flux and a desalting effect of the nano filter membrane are remarkably improved, and the graphene oxide composite nano filter membrane has the good large-scale industrialized application prospects.

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide composite nanofiltration membrane, belonging to the technical field of separation membrane preparation. Background technique [0002] Nanofiltration is a new type of membrane separation technology, which is between reverse osmosis and ultrafiltration. The pore size is in the nanometer range, generally 0.5-2.0nm. At present, the preparation methods of nanofiltration membranes mainly include composite method, phase inversion method, charging method and blending method, among which composite method includes surface coating method and interfacial polymerization method. Composite method is currently the most used and most effective method for preparing nanofiltration membranes, and it is also the method for producing commercial nanofiltration membranes with the most varieties and the largest yield. The method is to compound an ultra-thin functional layer with a nanometer aperture on the su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/68B01D71/08B01D71/02B01D71/54B01D71/26B01D71/34B01D71/30B01D71/42B01D71/16
Inventor 高学理王佳立王智
Owner OCEAN UNIV OF CHINA
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