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Graphene PVDF composite conductive ultrafiltration membrane as well as preparation and contaminant removing methods of ultrafiltration membrane

A composite conductive and graphene technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of low cleaning efficiency and achieve high cleaning efficiency and good conductivity

Active Publication Date: 2018-11-30
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide the removal method of above-mentioned graphene PVDF composite conductive ultrafiltration membrane surface pollutant, solve the problem that existing graphene ultrafiltration membrane pollutant cleaning efficiency is low

Method used

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  • Graphene PVDF composite conductive ultrafiltration membrane as well as preparation and contaminant removing methods of ultrafiltration membrane
  • Graphene PVDF composite conductive ultrafiltration membrane as well as preparation and contaminant removing methods of ultrafiltration membrane

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Effect test

Embodiment 1

[0052] A preparation method of graphene PVDF composite conductive ultrafiltration membrane, specifically as follows:

[0053] Step 1, preparation of copper foil with a thin layer of graphene attached

[0054] Step 1.1, select a piece with a size of 2×2cm 2 Copper foil of the same size, immersed in 30% hydrogen peroxide for 30 minutes, the reaction temperature is 60°C, the surface of the copper foil is oxidized, and a laser drilling machine is used to uniformly etch 200×200 matrix pits on the surface of the copper oxide, but the copper foil cannot be perforated . The area of ​​a single pit is about 1 μm in diameter, and the depth is about 5 μm.

[0055] Step 1.2, put the copper foil prepared in step 1.1 in acetone for 5 minutes and wash it three times with absolute ethanol to remove the organic matter on the surface of the copper foil, then take it out and ultrasonically wash it in deionized water for 10 minutes, remove the organic solution used for cleaning, and ensure The ...

Embodiment 2

[0074] A preparation method of graphene PVDF composite conductive ultrafiltration membrane, specifically as follows:

[0075] Step 1, preparation of copper foil with graphene thin layer

[0076] Step 1.1, select a piece with a size of 2×2cm 2Copper foil of the same size, immersed in 30% hydrogen peroxide for 30 minutes, the reaction temperature is 60°C, the surface of the copper foil is oxidized, and a laser drilling machine is used to uniformly etch 100×100 matrix pits on the surface of the copper oxide, but the copper foil cannot be perforated . The area of ​​a single pit is about a circular pit with a diameter of 4 μm, and the depth is about 10 μm.

[0077] In step 1.2, soak the treated copper foil in acetone for 5 minutes, then wash it with absolute ethanol for 3 times, and then soak it in deionized water for 10 minutes sonication.

[0078] In step 1.3, immerse the copper foil treated in step 1.2 in a 0.2 mol / L hydrochloric acid solution for 2 minutes to remove the oxid...

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Abstract

The invention discloses a graphene PVDF composite conductive ultrafiltration membrane and a preparation method thereof. The method comprises the following steps: a plurality of concave and convex pitpoints are etched on a surface of a copper foil by adopting a laser pore-forming technique, and a plurality of layers of graphene thin layers grow on the surface of the copper foil to form a graphenethin layer with defects; dimethylacetamide, polyvinylidene fluoride and polyvinylpyrrolidone are uniformly mixed to obtain a casting solution; and the casting solution uniformly coats the graphene thin layer of the copper foil, the whole copper foil is put into water, membrane formation is performed by phase inversion, the membrane-formed copper foil is put into a nitric acid solution, and after the copper foil is dissolved by nitric acid, the graphene PVDF composite conductive ultrafiltration membrane is obtained. The membrane disclosed by the invention comprises a PVDF supporting thin layer,the graphene thin layer adheres to the surface of the PVDF supporting thin layer, the graphene thin layer has the defects, the defects are pores, and hydrophilic functional groups is in the pores. The ultrafiltration membrane disclosed by the invention has good conductivity, and is cleaned by utilizing an electrochemical manner when being contaminated by a contaminant, wherein the cleaning efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of graphene ultrafiltration membranes, in particular to a graphene PVDF composite conductive ultrafiltration membrane, a preparation method of the ultrafiltration membrane, and a method for removing pollutants on the surface of the ultrafiltration membrane. Background technique [0002] As a commonly used method in the advanced treatment of water, ultrafiltration membranes have been widely used in the water treatment industry, but the membrane fouling caused by membrane surface adsorption and deposition resulting in smaller or clogged membrane pore sizes has always restricted the development of membrane technology. , while the conventional chemical cleaning has great damage to the membrane surface and the cleaning effect is very limited. Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms with sp2 hybrid orbitals forming a hexagonal honeycomb lattice. It has excellent optical, electric...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0079B01D71/34C02F1/444
Inventor 张耀中王涛郑兴
Owner XIAN UNIV OF TECH
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