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Graphene PVDF composite conductive ultrafiltration membrane and its preparation and pollutant removal method

A composite conductive and graphene technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve problems such as low cleaning efficiency

Active Publication Date: 2021-06-15
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 and its preparation and pollutant removal method
  • Graphene PVDF composite conductive ultrafiltration membrane and its preparation and pollutant removal method

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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. Laser pore-making technology is used to etch several concave-convex pits on the surface of copper foil, and then several layers of graphene thin layers are grown on the surface of copper foil to form a Defective graphene thin layer; mix dimethylacetamide, polyvinylidene fluoride and polyvinylpyrrolidone evenly to obtain a casting solution; evenly coat the casting solution on the graphene thin layer of copper foil, and then put the whole Perform phase inversion in water to form a film, then place the film-formed copper foil in a nitric acid solution, and wait for the copper foil to be dissolved by the nitric acid to obtain a graphene PVDF composite conductive ultrafiltration membrane. The membrane comprises a PVDF supporting thin layer, a graphene thin layer is attached to the surface of the PVDF supporting thin layer, and there are defects on the graphene thin layer, and the defects are holes, and hydrophilic functional groups are inside the holes. The ultrafiltration membrane of the invention has good electrical conductivity, and is cleaned by electrochemical means when pollutants are attached, and 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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Patent Type & Authority Patents(China)
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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