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High-flux graphene oxide hollow fiber composite nanofiltration membrane and preparation method thereof

A fiber composite and graphene technology, applied in the field of separation membranes, can solve the problems of inability to meet high flux and high selectivity, small water flux to limit large-scale applications, and low flux of composite membranes, and achieve good separation effect, high Selectivity to maintain and improve the effect of flux

Inactive Publication Date: 2022-04-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphene oxide membrane has high dye separation efficiency, its small water flux limits its large-scale application. Low permeation flux is a key technical problem to be solved urgently for graphene oxide membrane.
The intercalation of nanoparticles and nanowires can improve the flux of graphene oxide membrane to a limited extent, but the intercalation amount is low, and the flux of the composite membrane is improved slightly; increasing the intercalation amount, the flux of the composite membrane is greatly improved, but its rejection rate is greatly improved. However, it still cannot meet the needs of high-throughput and high-selectivity in practical applications

Method used

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  • High-flux graphene oxide hollow fiber composite nanofiltration membrane and preparation method thereof
  • High-flux graphene oxide hollow fiber composite nanofiltration membrane and preparation method thereof
  • High-flux graphene oxide hollow fiber composite nanofiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Mix 2 mg / mL graphene oxide dispersion with 30% hydrogen peroxide solution at a volume ratio of 20:1, heat and react at 50°C for 2 hours, centrifuge to remove aggregated particles, and freeze-dry the remaining solution to obtain porous graphene oxide, Re-disperse in deionized water to form a porous graphene oxide dispersion with a concentration of 0.2 μg / mL.

[0026] (2) Add the titanium dioxide nanofiber material into deionized water to prepare a titanium dioxide nanofiber dispersion with a concentration of 0.2 μg / mL.

[0027] (3) The porous graphene oxide dispersion in step (1) and the titanium dioxide nanofiber dispersion in step (2) are configured into a mixed solution according to a mass ratio of 10:1.

[0028] (4) The dispersion liquid in step (3) was vacuum filtered for 10 minutes, and a separation layer with a thickness of 10-900 nm was deposited on the polyvinylidene fluoride hollow fiber support, and vacuum-dried at 20 ° C for 2 hours to obtain porous graph...

Embodiment 2

[0030] (1) Mix 5 mg / mL graphene oxide dispersion with 30% hydrogen peroxide solution at a volume ratio of 10:1, heat and react at 80°C for 4 hours, centrifuge to remove agglomerated particles, and freeze-dry the remaining solution to obtain porous graphene oxide, Re-disperse in deionized water to form a porous graphene oxide dispersion with a concentration of 20 μg / mL.

[0031] (2) Add the titanium dioxide nanofiber material into deionized water to prepare a titanium dioxide nanofiber dispersion with a concentration of 20 μg / mL.

[0032] (3) The porous graphene oxide dispersion in step (1) and the titanium dioxide nanofiber dispersion in step (2) are configured into a mixed solution according to a mass ratio of 1:1.

[0033] (4) The dispersion in step (3) was vacuum filtered for 50 minutes, and a separation layer with a thickness of 10-900 nm was deposited on the polyvinylidene fluoride hollow fiber support, and vacuum-dried at 40 ° C for 10 hours to obtain porous graphite oxi...

Embodiment 3

[0035] (1) Mix 10 mg / mL graphene oxide dispersion with 30% hydrogen peroxide solution at a volume ratio of 5:1, heat and react at 120°C for 6 hours, centrifuge to remove aggregated particles, and freeze-dry the remaining solution to obtain porous graphene oxide, Re-disperse in deionized water to configure a porous graphene oxide dispersion with a concentration of 200 μg / mL.

[0036] (2) Add the titanium dioxide nanofiber material into deionized water to prepare a titanium dioxide nanofiber dispersion with a concentration of 200 μg / mL.

[0037] (3) The porous graphene oxide dispersion in step (1) and the titanium dioxide nanofiber dispersion in step (2) are configured into a mixed solution according to a mass ratio of 1:10.

[0038] (4) The dispersion liquid in step (3) was vacuum filtered for 100 min, and a separation layer with a thickness of 10-900 nm was deposited on the polyvinylidene fluoride hollow fiber support, and vacuum-dried at 50 ° C for 24 h to obtain porous graph...

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Abstract

The invention discloses a high-flux graphene oxide hollow fiber composite nanofiltration membrane and a preparation method thereof. Nanofibers are embedded between layers of porous graphene oxide, in-plane nanopores of the porous graphene oxide provide additional transmission channels, the embedded nanofibers can control the interlayer spacing of the porous graphene oxide and form the nanochannels for fluid to quickly pass through, and after the nanofibers are compounded with the porous structure of the graphene oxide, the molecular transmission path can be effectively shortened, and the transmission efficiency is improved. The flux of the composite membrane can be improved, and the high selectivity of the composite membrane to water and dye can also be maintained. The high-flux graphene oxide hollow fiber composite nanofiltration membrane disclosed by the invention has a good separation effect on dyes in water, is high in rejection rate and has relatively high water flux.

Description

technical field [0001] The invention belongs to the field of separation membranes, and relates to a high-throughput graphene oxide hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] In recent years, the rapid development of my country's textile industry has inevitably produced a large amount of printing and dyeing wastewater, causing serious environmental pollution and waste of resources. Therefore, it is imminent to solve the pollution problem of dye wastewater. Compared with traditional separation technologies such as rectification and molecular sieve adsorption, the membrane separation process has the advantages of operating at room temperature, no phase change, small equipment volume, high efficiency and energy saving, and no pollution in the production process. [0003] Graphene oxide, as one of the main derivatives of graphene, is a two-dimensional nanomaterial with a single atomic layer thickness, and its lat...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D71/02B01D69/12B01D69/10B01D69/08B01D67/00C02F1/44C02F101/30
CPCB01D71/021B01D71/10B01D69/12B01D67/0079B01D69/10B01D69/08B01D61/027C02F1/442C02F2101/308
Inventor 王春雷瞿国壮许凤段松君王同华
Owner DALIAN UNIV OF TECH