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Graphene micro-ultrafiltration membrane and preparation method thereof

A technology of graphene and ultrafiltration membranes, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of single surface functional groups and not as widely used as graphene oxide, and achieve the goal of improving membrane performance and hydrophilicity Effect

Active Publication Date: 2021-03-12
盐城海普润科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with graphene oxide, the surface functional groups of graphene are relatively single, so it is not as widely used in the field of membrane separation as graphene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dissolve 0.5g of hyperbranched polyester (brand name: H4OP) in 34.45g of N,N-dimethylformamide at 40°C with stirring to prepare a hyperbranched polyester solution;

[0034] (2) 0.025g of graphene oxide, 0.025g of graphene and the hyperbranched polyester solution prepared in step 1) were mixed, and ultrasonicated for 30min to obtain a graphene / graphene oxide / hyperbranched polyester solution;

[0035] (3) Mix and dissolve 15g of polyethersulfone and the graphene / graphene oxide / hyperbranched polyester solution prepared in step 2) at 90°C under stirring conditions for 2 hours, filter and defoam to obtain graphene casting Membrane fluid;

[0036] (4) Paste 2 layers of 1.8cm wide scotch tape around the 20cm×20cm glass plate, scrape the graphene casting solution prepared in step 3) on the inner range surrounded by the scotch tape of the glass plate with a glass rod, Immediately put in water to solidify for 10 minutes, wash with water, and dry to prepare the graphene ultra...

Embodiment 2

[0039] (1) Dissolve 5g of hyperbranched polyester (brand name: H2OP) in 39.5g of N,N-dimethyl sulfoxide under stirring conditions at 50°C to prepare a hyperbranched polyester solution;

[0040] (2) 0.25g of graphene oxide, 0.25g of graphene and the hyperbranched polyester solution prepared in step 1) were mixed, and ultrasonicated for 30 minutes to obtain a graphene / graphene oxide / hyperbranched polyester solution;

[0041] (3) Mix 5 g of cellulose acetate and the graphene / graphene oxide / hyperbranched polyester solution prepared in step 2) at 40°C with stirring, dissolve for 2 hours, filter, and defoam to obtain a graphene casting Membrane fluid;

[0042] (4) Extrude the graphene casting solution and core solution (a solution consisting of 1% hyperbranched polyester and 99% acetone) obtained in step 3) through a spinneret at the same time to obtain graphene The liquid membrane is immediately put into a 40% N, N-dimethylsulfoxide aqueous solution to solidify, washed with water,...

Embodiment 3

[0045] (1) Dissolve 10g of dendritic polyamidoamine (brand: CYD-110H) in 31.5g of N,N-dimethylacetamide under stirring conditions at 80°C to prepare a dendritic polyamidoamine solution;

[0046](2) Mix 0.5 g of graphene oxide, 0.5 g of graphene and the dendritic polyamidoamine solution prepared in step 1), and ultrasonicate for 30 minutes to prepare a graphene / graphene oxide / dendritic polyamidoamine solution;

[0047] (3) Mix and dissolve 7.5g of polyacrylonitrile and the graphene / graphene oxide / dendritic polyamidoamine solution prepared in step 2) at 80°C with stirring for 2 hours, filter and defoam to obtain graphite ethylene casting solution;

[0048] (4) Paste 2 layers of 1.8cm wide scotch tape around the 20cm×20cm glass plate, scrape the graphene casting solution prepared in step 3) on the inner range surrounded by the scotch tape of the glass plate with a glass rod, Immediately put into a mass concentration of 20% N,N-dimethylacetamide to coagulate, wash with water, and...

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Abstract

The invention discloses a graphene micro-ultrafiltration membrane and a preparation method thereof, and particularly discloses a preparation method of the graphene micro-ultrafiltration membrane. Themethod comprises the following steps: dissolving graphene, graphene oxide, dendritic macromolecules and high-molecular polymers in a solvent to obtain a membrane casting solution, scraping or spinningor coating the membrane casting solution on the outer surface of a hollow fiber braided tube, performing solidifying, performing washing with water, performing airing, crosslinking glutaraldehyde, and performing drying. According to the preparation method, hydrophilic dendritic macromolecules and graphene oxide are introduced into the graphene micro-ultrafiltration membrane, so that the hydrophilicity of the membrane can be remarkably improved; graphene and graphene oxide are coated with a dendritic macromolecular solution, so that graphene and graphene oxide are uniformly and stably dissolved in a solvent, and stable dispersion of graphene and graphene oxide in a membrane casting solution is facilitated. Through glutaraldehyde, active groups such as hydroxyl and amino in dendritic macromolecules and graphene oxide are subjected to cross-linking polymerization reaction, so that the compatibility and stability between high-molecular polymers and the dendritic macromolecules and betweenthe graphene oxide and the graphene are improved, and the membrane performance is improved.

Description

technical field [0001] The invention relates to the field of water treatment separation membranes, in particular to a graphene micro-ultrafiltration membrane and a preparation method thereof. Background technique [0002] With the continuous development of industry and agriculture, according to relevant predictions, by 2025, more than 3 billion people in the world will face the problem of water shortage, and more than 40 countries and regions will experience serious shortage of fresh water, and the problem of water pollution is becoming a problem. The main problems that people will face in life and survival. In response to the crisis of fresh water resources and the sustainable utilization of water resources, the most effective method is to "increase revenue and reduce expenditure". At present, the main methods used are desalination of seawater, that is, to obtain fresh water from the sea that accounts for 70% of the earth's surface; for domestic sewage, industrial wastewate...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D61/14B01D67/00
CPCB01D71/021B01D61/145B01D67/0048B01D2325/36B01D2325/24Y02A20/131
Inventor 刘必前
Owner 盐城海普润科技股份有限公司
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