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Hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane, preparation method and application

An underwater superoleophobic, graphene-based technology, applied in chemical instruments and methods, separation methods, osmotic/dialysis water/sewage treatment, etc., can solve the problem of lack of industrial control characteristics, shedding of coating materials, and decreased treatment efficiency and other problems, to achieve the effect of improving the anti-fouling performance of the film, easy to control the thickness, and enhancing the stability

Inactive Publication Date: 2017-11-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current membrane separation technology is not perfect enough. For example, polymer membranes such as polysulfone generally have membrane fouling problems, or filter membranes made by mixing hydrophilic substances and surface modification, because the coating material falls off, resulting in a decrease in treatment efficiency, while The functionalized nano-composite filter membrane completed under stricter experimental conditions does not have the characteristics of simple and easy-to-operate industrial control

Method used

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  • Hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane, preparation method and application
  • Hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane, preparation method and application
  • Hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane, preparation method and application

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Effect test

Embodiment 1

[0025] (1) Preparation of graphene oxide by modified Hummers method

[0026] In the state of ice bath, add 3g of graphite powder, 40mL of concentrated phosphoric acid and 360mL of concentrated sulfuric acid into a 500mL three-neck flask and stir evenly with magnetic force. Then slowly add 18g of potassium permanganate in batches, and after fully stirring the reaction, transfer the three-neck flask from the ice bath to the oil bath and raise the temperature to 50°C for 12 hours while stirring.

[0027] After the mixture was cooled to room temperature, it was placed in an ice-water bath, diluted with 1 L of distilled water and added dropwise with 30% hydrogen peroxide until the solution was bright yellow. Vacuum filter cake was rinsed with dilute hydrochloric acid, centrifuged at 8000rpm for 5 minutes, and washed with acid three times to remove sulfate ions in the solution. Centrifuge at 10,000 rpm for 10 minutes, wash with water 5 times, adjust the pH of the solution to neutra...

Embodiment 2

[0037] (1) Preparation of graphene oxide by modified Hummers method

[0038] In the state of ice bath, add 3g of graphite powder, 40mL of concentrated phosphoric acid and 360mL of concentrated sulfuric acid into a 500mL three-neck flask and stir evenly with magnetic force. Then slowly add 18g of potassium permanganate in batches, and after fully stirring the reaction, transfer the three-neck flask from the ice bath to the oil bath and raise the temperature to 50°C for 12 hours while stirring.

[0039] After the mixture was cooled to room temperature, it was placed in an ice-water bath, diluted with 1 L of distilled water and added dropwise with 30% hydrogen peroxide until the solution was bright yellow. Vacuum filter cake was rinsed with dilute hydrochloric acid, centrifuged at 8000rpm for 5 minutes, and washed with acid three times to remove sulfate ions in the solution. Centrifuge at 10,000 rpm for 10 minutes, wash with water 5 times, adjust the pH of the solution to neutra...

Embodiment 3

[0050] (1) Preparation of graphene oxide by modified Hummers method

[0051] In the state of ice bath, add 3g of graphite powder, 40mL of concentrated phosphoric acid and 360mL of concentrated sulfuric acid into a 500mL three-neck flask and stir evenly with magnetic force. Then slowly add 18g of potassium permanganate in batches, and after fully stirring the reaction, transfer the three-neck flask from the ice bath to the oil bath and raise the temperature to 50°C for 12 hours while stirring.

[0052] After the mixture was cooled to room temperature, it was placed in an ice-water bath, diluted with 1 L of distilled water and added dropwise with 30% hydrogen peroxide until the solution was bright yellow. Vacuum filter cake was rinsed with dilute hydrochloric acid, centrifuged at 8000rpm for 5 minutes, and washed with acid three times to remove sulfate ions in the solution. Centrifuge at 10,000 rpm for 10 minutes, wash with water 5 times, adjust the pH of the solution to neutra...

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Abstract

The invention provides a hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane, a preparation method and application. Epoxy group, hydroxyl, carbonyl and carboxyl on a graphene oxide nanosheet are used as anchoring loci for embedding a copper hydroxide nanowire, a copper hydroxide nanowire with hydroxyl on an outer surface is attached onto the graphene oxide nanosheet by virtue of hydrogen bonds, the copper hydroxide nanowire covers and is inserted into a surface and a gap of a flaky graphene oxide sheet so as to adjust the surface physical performance and a channel layering structure of the flaky graphene oxide and to form a composite material with a coarse surface structure and a nanoscale channel structure, the copper hydroxide nanowire with positive charges and the graphene oxide sheet with negative charges are closely accumulated onto a porous filter membrane by virtue of electrostatic interaction, and the hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane is formed. The hydrophilic-underwater super-oleophobic graphene oxide-base filter membrane is used for separating oil and water, has the characteristics of good hydrophilic performance and mechanical performance, has good stability and improves the membrane pollution resistance.

Description

technical field [0001] The invention relates to a hydrophilic-underwater super-oleophobic graphene oxide-based filter membrane, a preparation method and application thereof, and belongs to the technical field of separation membrane preparation. Background technique [0002] With the continuous increase of human oil development and the rapid development of the oil industry, the use of oil and oil products is increasing. What follows is that a large number of related pollutants enter the water environment through different channels to form petroleum sewage. If these petroleum sewage are discharged directly without treatment, they will not only pollute the soil and water sources, but even cause accidents and threaten human health. . Therefore, for petroleum sewage, it is urgent to carry out in-depth treatment through appropriate means in order to achieve the goals of energy saving, consumption reduction, environmental protection and water resource reuse. Membrane separation t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D67/00C02F1/40C02F1/44
CPCB01D67/0079B01D69/02B01D69/12B01D2325/24B01D2325/36B01D2325/48C02F1/40C02F1/44
Inventor 刘军冯阳吕晓萌王志文
Owner JIANGSU UNIV
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