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Cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane and preparation method thereof

A nanofiber and cellulose technology applied in the field of ultrafiltration membranes to improve filtration efficiency, prevent pollution and scaling, improve pressure resistance and other tolerance effects

Active Publication Date: 2016-03-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former requires complex treatment processes such as GA (glutaraldehyde) cross-linking because the hydrophilic material itself is soluble in water; the latter filter layer material itself is insoluble in water, but requires a special solvent, that is, an ionic liquid, and the recovery of the ionic liquid is in Production remains a huge challenge

Method used

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  • Cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane and preparation method thereof
  • Cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane and preparation method thereof

Examples

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Effect test

example 1

[0030] Example 1: 5 grams of cellulose nanofibers (mass concentration of 0.0475%) and graphene oxide (mass concentration of 0.0025%) are evenly coated on the surface of the electrospun nanofiber (soaked in water) substrate (50 square centimeters), The membrane is dried in an oven at 120 degrees Celsius for 20 minutes to obtain a cellulose-graphene oxide nanofiber composite ultrafiltration membrane.

example 2

[0031] Example 2: 5 grams of chitin nanofibers (mass concentration of 0.049%) and graphene oxide (mass concentration of 0.001%) are evenly coated on the surface of a commercial microfiltration membrane (soaked in water) substrate (50 square centimeters), The membrane is dried in an oven at 120 degrees Celsius for 20 minutes to obtain a chitin-graphene oxide nanofiber composite ultrafiltration membrane.

example 3

[0032] Example three: the characterization of the surface morphology of the cellulose-graphene oxide nanofiber composite film obtained by the example one, its scanning electron micrograph is as follows figure 1 shown. The fiber diameter of the electrospun nanofiber support layer is about 150-250 nanometers, and the fibers are intertwined with each other to form a network structure. The cellulose nanofiber-graphene oxide forms an extremely thin filter layer on the surface of the electrospinning support layer, and its thickness is about 200 nanometers. Therefore, the fiber profile of the electrospinning support layer can be seen from the surface of the composite membrane.

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Abstract

The invention relates to a cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane and a preparation method thereof. The cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane structurally comprises at least one cellulose nanofiber and graphene oxide hybridized filtering layer, and at least one micro-filtration membrane supporting layer or electrostatic spinning nanofiber supporting layer. The composite ultrafiltration membrane has the good anti-pollution scaling property and pressure-resistant property when being used in oil-water separation process; compared with a commercial membrane, the composite ultrafiltration membrane has water flux 2-10 time that of the commercial membrane under a condition of same reject rate.

Description

technical field [0001] The invention relates to an anti-pollution and fouling ultrafiltration membrane, in particular to a high-flux anti-scaling ultrafiltration membrane prepared by hybridization of cellulose nanofibers and graphene oxide and a preparation method thereof, and is used for oilfield wastewater and oily wastewater of submarines , and the field of industrial oil-water wastewater separation. Background technique [0002] The problem of fouling and scaling of ultrafiltration membranes is one of the main factors affecting the separation efficiency and service life of the membranes. Therefore, improving the anti-fouling and fouling performance of the membranes by changing the surface properties and structural characteristics of the membranes is a solution to this problem. the main way. Common methods include (1) membrane surface grafting; (2) hydrophilic filter layer; (3) superhydrophobic and superoleophobic surfaces. [0003] Grafting PEG (polyethylene oxide) on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/12B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0079B01D69/12B01D71/10C02F1/444
Inventor 马洪洋
Owner BEIJING UNIV OF CHEM TECH
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