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A nanofiltration membrane resistant to organic solvents modified by graphene oxide, preparation method and application

A technology resistant to organic solvents and organic solvents, applied in the field of nanofiltration membranes, can solve problems such as lack of stability

Active Publication Date: 2019-07-16
南京蔚华膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the further industrialization of organic solvent-resistant nanofiltration membranes faces some challenges, including: (1) lack of stability in various organic solvents (including aprotic solvents), (2) enhancing the resistance of organic solvent-resistant nanofiltration membranes. Swellability and mechanical strength

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  • A nanofiltration membrane resistant to organic solvents modified by graphene oxide, preparation method and application
  • A nanofiltration membrane resistant to organic solvents modified by graphene oxide, preparation method and application
  • A nanofiltration membrane resistant to organic solvents modified by graphene oxide, preparation method and application

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preparation example Construction

[0037] The preparation method of the above-mentioned composite nanofiltration membrane is mainly to dissolve the polyimide and the additive polyethylene glycol in an organic solvent, and then coat it on the support layer by phase separation to obtain a wet membrane; , by placing it in a cross-linking agent solution, carrying out a cross-linking reaction, taking it out and washing it to obtain a modified nanofiltration membrane, which can realize the surface cross-linking modification on the polyimide layer, and can better improve the bonding strength of the graphene oxide layer .

[0038] In the above steps, the weight ratio of polyimide, polyethylene glycol and organic solvent is preferably 20:10-22:30-75, preferably 20:16:64. Wherein polyethylene glycol is preferably polyethylene glycol 200~6000, more preferably polyethylene glycol 200~600, more preferably polyethylene glycol 400; Described organic solvent is preferably selected from N-methylpyrrolidone, N-N, 2-methylformamid...

Embodiment 1

[0043] (1) Dissolve polyimide P84 and polyethylene glycol (400) in N-methylpyrrolidone at a mass ratio of 20:12:50, stir mechanically at room temperature for 48 hours, wait until it is completely dissolved, and statically Set for 12h for degassing. Use an automatic film scraping machine to scrape and coat the casting solution on a clean glass plate, control the thickness of the scraper to 100 μm, control the volatilization time for 5 seconds, immerse in a deionized water coagulation bath, phase separation occurs and solidify to form a film, take it out after soaking for 3 minutes Store in deionized water.

[0044] (2) Prepare an isopropanol solution containing 10wt% 1,6-hexamethylenediamine, soak the above-mentioned basement film in the solution, and control for 24 hours to carry out the cross-linking reaction. When the reaction is complete, take it out and wash it three times with deionized water to remove residual organic matter, soak in deionized water for 24 hours, and ch...

Embodiment 2

[0049] (1) Dissolve polyimide P84 and polyethylene glycol (600) in N-methylpyrrolidone at a mass ratio of 20:13:55, mechanically stir at room temperature for 30 hours, wait until it is completely dissolved, and statically Set for 10h for degassing. Use an automatic film scraping machine to scrape and coat the casting solution on a clean glass plate, control the thickness of the scraper to 80 μm, control the volatilization time for 5 seconds, immerse in a deionized water coagulation bath, phase separation occurs and solidify to form a film, take it out after soaking for 3 minutes Store in deionized water.

[0050] (2) Prepare an ethanol solution containing 12wt% ethylenediamine, soak the basement film in the solution, and control for 15 hours to carry out cross-linking reaction. When the reaction is complete, take it out and wash it three times with deionized water to remove residual organic matter, soak in deionized water for 36 hours, and change the water every 12 hours to o...

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Abstract

The invention relates to a method for modifying an organic solvent-resistant nanofiltration membrane by graphene oxide, the nanofiltration membrane and an application in filtering. The method comprises the following steps of preparing a base membrane solution, mechanically stirring to completely dissolve, stilling, defoaming, scraping to form a flat plate membrane on a nonwoven cloth, and soaking the base membrane into a crosslinking agent solution to perform crosslinking reaction, wherein the base membrane has the solvent-resistant property; preparing a graphene oxide suspension, utilizing a high-pressure ultrafiltration device, and coating graphene oxide onto the surface of the crosslinking modified membrane; storing the prepared membrane in deionized water for standby. The method has the characteristics that the graphene oxide is coated onto the surface of the solvent-resistant base membrane; the preparation technology is simple, the prepared graphene oxide-polyimide nanofiltration membrane is applied into a polar solvent, and the trapping rate is higher.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes. More specifically, the present invention relates to a method for modifying an organic solvent-resistant nanofiltration membrane by using graphene oxide, as well as the obtained nanofiltration membrane and its application in filtration. Background technique [0002] Nanofiltration is a new membrane separation technology between ultrafiltration and reverse osmosis, with a molecular weight cut-off in the range of 200-1000 Daltons. Compared with ultrafiltration membranes and reverse osmosis membranes, nanofiltration membranes have the advantages of high water flux and high rejection at lower operating pressures, especially for divalent ions and low molecular weight organic small molecules. It has a high interception rate (greater than 90%), and has the advantages of no phase change, low cost, and easy integration, modularization, and automation. Under the background of global shorta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/64B01D61/02
CPCB01D61/027B01D67/0079B01D69/12B01D71/64B01D2323/30
Inventor 孙世鹏王珏郭家林陆天丹陈伯志邢卫红徐南平
Owner 南京蔚华膜科技有限公司
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