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Ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use

A graphene, super-hydrophilic technology, applied in membrane, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of basement membrane affecting anti-fouling, incomplete membrane separation technology, and decreased processing efficiency, etc., to improve the anti-membrane Pollution performance, high water permeation selectivity, easy thickness control effect

Inactive Publication Date: 2018-06-15
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. The filter membrane made by mixing hydrophilic substances and surface modification, in addition to the problem that the treatment efficiency is reduced due to the shedding of the coating material, also has the problem of affecting the anti-pollution property due to the properties of the basement membrane itself. defect

Method used

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  • Ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use
  • Ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use
  • Ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of graphene oxide by modified Hummers method

[0030] 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.

[0031] 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

[0044] (1) Preparation of graphene oxide by modified Hummers method

[0045] 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.

[0046] 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

[0060] (1) Preparation of graphene oxide by modified Hummers method

[0061] 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.

[0062] 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 relates to an ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use, and belongs to the technical field of separation membrane preparation. First, grapheneoxide and nano-zinc oxide are added to distilled water and ultrasonically dispersed; a dopamine solution containing dopamine hydrochloride is added and mechanically stirred; the mixed solution is thensuction-filtered and deposited onto the surface of a mixed cellulose ester membrane by vacuum suction filtration, and the ultra-hydrophilic-underwater superoleophobic unsupported reduced graphene oxide filtering membrane is obtained by drying and self falling. The reduced graphene oxide membrane has the advantages of high water permeation selectivity, flux and stability, and membrane pollution resistance, can effectively separate oily wastewater, provides an efficient, environmentally friendly and economic technical means, and has important practical significance.

Description

technical field [0001] The invention relates to a superhydrophilic-superoleophobic reduced graphene oxide filter membrane and its application, belonging to the technical field of separation membrane preparation. Background technique [0002] Petroleum plays an important role in modern daily life and social development, but at the same time it brings serious environmental pollution. As a common and difficult source of pollution, emulsified oil poses a serious threat to the environment and human health. How to deal with emulsified oil has become an urgent and challenging issue worldwide. Membrane separation technology has been widely used to remove emulsified oil from water due to its considerable flux and simpler process than other technologies. However, fouling from oil droplets or adsorbed surfactants has been a key issue limiting their wide application. Inspired by the hydrophobicity of lotus leaves and the oil repellency of fish scales in water, scholars have prepared s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D71/02B01D67/00B01D17/022C02F1/40C02F1/44
CPCB01D69/02B01D17/02B01D17/0202B01D17/085B01D67/0079B01D69/12B01D71/021B01D71/024B01D2325/36C02F1/40C02F1/44
Inventor 刘军冯阳吕晓萌王志文
Owner JIANGSU UNIV
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