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Borate intercalation modified graphene oxide composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and borate technology, which is applied in the field of nanofiltration membranes, achieves good industrial production and application prospects, low cost, and mild reaction conditions.

Active Publication Date: 2020-11-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a graphene oxide composite nanofiltration membrane modified by borate intercalation. sheet, increase the interlayer distance of graphene oxide before film formation to solve the environmental pollution problem of organic small molecule intercalation, and increase the interlayer distance of graphene oxide to improve the permeation flux and separation performance of the membrane

Method used

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  • Borate intercalation modified graphene oxide composite nanofiltration membrane and preparation method thereof
  • Borate intercalation modified graphene oxide composite nanofiltration membrane and preparation method thereof
  • Borate intercalation modified graphene oxide composite nanofiltration membrane and preparation method thereof

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Effect test

Embodiment 1

[0035] (1) Immerse the polypropylene cyanide membrane in the sodium hydroxide solution, let it stand at 40°C for 2 hours, rinse the excess sodium hydroxide solution with deionized water, and obtain the hydrolyzed polypropylene cyanide membrane, wherein the concentration of sodium hydroxide is 2mol / L .

[0036] (2) Immerse the hydrolyzed polypropylene cyanide film obtained in step (1) in the polyethyleneimine solution, let it stand at 40°C for 1 hour, rinse the excess polyethyleneimine solution with deionized water, and obtain the base film, wherein polyethyleneimine The imine concentration was 1 g / L.

[0037] (3) Graphene oxide was dissolved in deionized water, ultrasonicated for 1 h to obtain a graphene oxide dispersion, sodium tetraborate was added, and shaken at 60° C. for 12 h to obtain a sodium tetraborate intercalation-modified graphene oxide solution. Wherein, the concentration of graphene oxide is 1 g / L, and the concentration of sodium tetraborate is 0.2 g / L.

[0038...

Embodiment 2

[0044] (1) Immerse the polypropylene cyanide membrane in the sodium hydroxide solution, let it stand at 40°C for 2 hours, rinse the excess sodium hydroxide solution with deionized water, and obtain the hydrolyzed polypropylene cyanide membrane, wherein the concentration of sodium hydroxide is 2mol / L .

[0045] (2) Immerse the hydrolyzed polypropylene cyanide film obtained in step (1) in the polyethyleneimine solution, let it stand at 40°C for 1 hour, rinse the excess polyethyleneimine solution with deionized water, and obtain the base film, wherein polyethyleneimine The imine concentration was 1 g / L.

[0046] (3) Graphene oxide was dissolved in deionized water, ultrasonicated for 1 h to obtain a graphene oxide dispersion, sodium tetraborate was added, and shaken at 60° C. for 12 h to obtain a borate intercalation modified graphene oxide solution. Wherein, the concentration of graphene oxide is 1 g / L, and the concentration of sodium tetraborate is 0.4 g / L.

[0047] (4) Immers...

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Abstract

The invention discloses a borate intercalation modified graphene oxide composite nanofiltration membrane and a preparation method thereof. Borate is used as an intercalation molecule to modify graphene oxide, and then the modified graphene oxide is connected with a hydrolyzed polypropylene cyanide membrane through polyethyleneimine to obtain the composite nanofiltration membrane. According to thepreparation method, borate is used as an inorganic covalent cross-linking agent for intercalation modification of layered graphene oxide nano sheets, and the interlayer distance of graphene oxide is increased before membrane formation, so that the problem of environmental pollution caused by small organic molecule intercalation is solved, and the interlayer distance of graphene oxide is increasedto improve the permeation flux and separation performance of the membrane; and the preparation process is mild in reaction conditions and low in cost.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, in particular to a graphene oxide composite nanofiltration membrane modified by borate intercalation and a preparation method thereof. Background technique [0002] Due to the rapid increase of the world's population, people's demand for water resources has far exceeded the natural water supply capacity, and nearly 80% of the world's population is facing the threat of water security. The lack of water resources that meet the requirements of use has almost become a major crisis facing human society. Nanofiltration, reverse osmosis and forward osmosis membrane processes are one of the most effective strategies to achieve the removal of traditional and emerging pollutants in water, and these processes require the use of semi-permeable membranes with excellent performance. [0003] Graphene oxide is an ideal film-forming material for nanofiltration membranes. The surface of graphene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02C02F1/44
CPCB01D69/12B01D69/125B01D67/0079B01D61/027C02F1/442B01D2323/12B01D2323/46B01D2323/30
Inventor 严晓菊成士荣暴瑞玲王国栋李珺宇
Owner HOHAI UNIV
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