Preparation method of graphene oxide nanofiltration membrane

A technology of nanofiltration membrane and graphene, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of affecting the service life, affecting the permeability and filtration capacity of the membrane, and the poor uniformity of sheet distribution. The effect of prolonging the service life and good application prospects

Inactive Publication Date: 2019-08-02
NANTONG QIANGSHENG GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the distribution uniformity of graphene micron-scale sheets in the aminated

Method used

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  • Preparation method of graphene oxide nanofiltration membrane
  • Preparation method of graphene oxide nanofiltration membrane

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Embodiment 1

[0028] The present embodiment relates to a kind of preparation method of graphene oxide nanofiltration membrane, specifically comprises the following steps:

[0029] S1, the preparation of graphene oxide aqueous solution:

[0030] (1) Low-temperature reaction: In an ice-water bath at -2°C, sequentially add concentrated sulfuric acid and potassium permanganate with a mass fraction of 98% to expandable graphite and stir evenly, and keep the reaction for 2 hours;

[0031] (2) Medium-temperature reaction: heat the temperature of the water bath in step (1) to 35°C, add ultrapure water to dilute after the temperature is stable, react for 5 hours, and the solution is brown;

[0032] (3) High-temperature reaction: heat the solution obtained in step (2) in a constant temperature water bath to 115° C., keep it for 50 minutes, then add a hydrogen peroxide solution with a mass concentration of 30%, and cool it to room temperature. The solution turns from brown to golden yellow;

[0033] ...

Embodiment 2

[0039] The present embodiment relates to a kind of preparation method of graphene oxide nanofiltration membrane, specifically comprises the following steps:

[0040] S1, the preparation of graphene oxide aqueous solution:

[0041] (1) Low-temperature reaction: in an ice-water bath at -1°C, sequentially add concentrated sulfuric acid and potassium permanganate with a mass fraction of 98% to expandable graphite and stir evenly, and keep the reaction for 1.8 hours;

[0042] (2) Medium-temperature reaction: heat the temperature of the water bath in step (1) to 38° C., add ultrapure water to dilute after the temperature is stable, and react for 4.5 hours, and the solution is brown;

[0043] (3) High-temperature reaction: heat the solution obtained in step (2) in a constant temperature water bath to 110° C., keep it for 55 minutes, then add a hydrogen peroxide solution with a mass concentration of 30%, and cool to room temperature. The solution turns from brown to golden yellow;

...

Embodiment 3

[0050] The present embodiment relates to a kind of preparation method of graphene oxide nanofiltration membrane, specifically comprises the following steps:

[0051] S1, the preparation of graphene oxide aqueous solution:

[0052] (1) Low-temperature reaction: in an ice-water bath at -5°C, sequentially add concentrated sulfuric acid and potassium permanganate with a mass fraction of 99% to expandable graphite and stir evenly, and keep the reaction for 2.5 hours;

[0053] (2) Medium-temperature reaction: heat the temperature of the water bath in step (1) to 40°C, add ultrapure water to dilute after the temperature is stable, react for 4 hours, and the solution is brown;

[0054] (3) High-temperature reaction: heat the solution obtained in step (2) in a constant temperature water bath to 105° C., keep it for 60 minutes, then add a hydrogen peroxide solution with a mass concentration of 28%, and cool to room temperature. The solution turns from brown to golden yellow;

[0055] (...

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Abstract

The invention discloses a preparation method of a graphene oxide nanofiltration membrane. Firstly, a graphene oxide water solution is prepared; amine monomers are added to the graphene oxide water solution, and a graphene oxide water-based membrane casting solution is prepared; a high-molecular polymer ultrafiltration membrane is taken as a base membrane, the base membrane is dipped with a layer of graphene oxide water-based membrane casting solution with a surface coating method and then dipped with an oil phase, the graphene oxide water-based membrane casting solution and oil-phase monomersare subjected to an interfacial polymerization reaction, a product is dried at 60-100 DEG C for 5-10 h, and the graphene oxide nanofiltration membrane can be prepared. In the prepared graphene oxide nanofiltration membrane, sub-micro sheet layers of graphene are staggered in parallel, a compact filtering layer is formed and completely covers holes of a support membrane, filtrate is filtered in a cross flow manner, impurities are stacked on the surface, and the cleaning effect can be obtained after parallel washing, so that the nanofiltration membrane has excellent filtering capability and staining resistance, and the service life is notably prolonged.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane preparation, in particular to a preparation method of graphene oxide nanofiltration membrane. Background technique [0002] As a new type of membrane separation technology, nanofiltration membrane technology has broad application prospects in the fields of water treatment, separation, purification and concentration of substances in petroleum, chemical, food, biological and pharmaceutical industries, and removal of organic matter in industrial wastewater. The preparation methods of nanofiltration membranes mainly include LS phase inversion method, blending method, charging method and composite method. The most widely used and effective method for preparing nanofiltration membranes is the composite method. The traditional interface polymerization method is the composite method. The most widely used method. Although the nanofiltration membrane prepared by the interfacial polymerizati...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/02B01D71/16B01D71/26B01D71/30B01D71/34B01D71/42B01D71/48B01D71/56B01D71/68
CPCB01D61/027B01D71/024B01D69/12B01D67/0039B01D67/0079B01D71/68B01D71/42B01D71/26B01D71/34B01D71/16B01D2325/36B01D71/48B01D71/30B01D71/56
Inventor 沙嫣沙晓林
Owner NANTONG QIANGSHENG GRAPHENE TECH CO LTD
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