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Preparation method for metal organic framework modified graphene oxide lamellar structure composite membrane used for organic solvent nanofiltration

A metal-organic framework and graphene sheet technology, applied in the field of membrane separation, can solve the problems of low membrane flux and poor affinity, and achieve high flux, improved separation performance, and simple preparation methods

Active Publication Date: 2017-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the edge of the GO sheet contains hydrophilic oxygen-containing functional groups such as -OH and -COOH, its affinity for organic solvent molecules is poor, so the separation membrane prepared by using GO as the added particle usually has low membrane flux amount, so it is necessary to modify GO

Method used

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  • Preparation method for metal organic framework modified graphene oxide lamellar structure composite membrane used for organic solvent nanofiltration
  • Preparation method for metal organic framework modified graphene oxide lamellar structure composite membrane used for organic solvent nanofiltration

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Weigh 0.366g Zn(NO 3 ) 2 ·H 2 O and 0.811g 2-methylimidazole were dissolved in 12mL and 20mL of methanol, then 16mL of 1g / L GO aqueous solution was added, the three were mixed evenly, after stirring for 2h, the product was centrifuged and washed three times with methanol to obtain ZIF -8@GO composite nanoparticles.

[0024] (2) Disperse the ZIF-8@GO composite particles in methanol to form a dispersion with a mass fraction of 0.01wt%, add polyethyleneimine (PEI, 50% aqueous solution), and dissolve the concentration to 0.03wt%, both obtained Casting solution. A glutaraldehyde solution with a concentration of 0.05 wt% was then prepared as a crosslinking agent solution.

[0025] (3) The casting solution is assembled on the alumina ceramic tube base film by means of negative pressure. The specific method is to block one end of the basement membrane of the ceramic tube with a rubber plug, and connect the other end to a vacuum pump to make the inner side of the cerami...

Embodiment 2

[0029] (1) Weigh 0.366g Zn(NO 3 ) 2 ·H 2 O and 0.811g 2-methylimidazole were dissolved in 12mL and 20mL of methanol, then 16mL of 1g / L GO aqueous solution was added, the three were mixed evenly, after stirring for 1h, the product was centrifuged and washed three times with methanol to obtain ZIF -8@GO composite nanoparticles.

[0030] (2) Disperse the ZIF-8@GO composite particles in methanol to form a dispersion with a mass fraction of 0.01wt%, add polyethyleneimine (PEI, 50% aqueous solution), and dissolve the concentration to 0.03wt%, both obtained Casting solution. A glutaraldehyde solution with a concentration of 0.05 wt% was then prepared as a crosslinking agent solution.

[0031] (3) The casting solution is assembled on the alumina ceramic tube base film by means of negative pressure. The specific method is to block one end of the basement membrane of the ceramic tube with a rubber plug, and connect the other end to a vacuum pump to make the inner side of the cerami...

Embodiment 3

[0035] (1) Weigh 0.366g Zn(NO 3 ) 2 ·H 2 O and 0.811g 2-methylimidazole were dissolved in 12mL and 20mL of methanol, then 16mL of 1g / L GO aqueous solution was added, the three were mixed evenly, after stirring for 1h, the product was centrifuged and washed three times with methanol to obtain ZIF -8@GO composite nanoparticles.

[0036](2) Disperse the ZIF-8@GO composite particles in methanol to form a dispersion with a mass fraction of 0.01wt%, add polyethyleneimine (PEI, 50% aqueous solution), and dissolve the concentration to 0.04wt%, both obtained Casting solution. A glutaraldehyde solution with a concentration of 0.05 wt% was then prepared as a crosslinking agent solution.

[0037] (3) The casting solution is assembled on the alumina ceramic tube base film by means of negative pressure. The specific method is to block one end of the basement membrane of the ceramic tube with a rubber plug, and connect the other end to a vacuum pump to make the inner side of the ceramic...

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Abstract

The invention provides a preparation method for a metal organic framework modified graphene oxide lamellar structure composite membrane used for organic solvent nanofiltration, and belongs to the field of membrane separation. The preparation method includes the steps that firstly, a metal organic framework and graphene oxide are composited to prepare composite nanometer particles; and the composite nanometer particles and a polymer are assembled on a base membrane to prepare the metal organic framework modified graphene oxide lamellar structure composite membrane used for the organic solvent nanofiltration. The composite membrane has a good separation effect for dyes in organic solvent and still has high flux under the low operation pressure, and therefore the composite membrane has application potential on the aspect of organic solvent nanofiltration.

Description

technical field [0001] The invention relates to an organic solvent nanofiltration membrane and its preparation technology, and in particular provides a specific method for preparing a metal-organic framework-modified graphene oxide lamellar structure composite membrane for organic solvent nanofiltration, which belongs to the field of membrane separation. Background technique [0002] Organic solvent nanofiltration is a separation process in which large molecules in an organic solvent mixture are retained under pressure, while small molecules permeate through the membrane and immerse into the other side. Compared with traditional distillation, absorption and extraction processes, nanofiltration has the advantages of low operating temperature, no phase change, high efficiency and energy saving for the separation of small molecules in organic solvents. Therefore, in recent years, the application of nanofiltration in the separation of organic systems has received widespread atte...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D61/00B01D71/06
CPCB01D61/027B01D67/0079B01D69/12B01D71/06
Inventor 纪树兰杨恒宇王乃鑫汪林
Owner BEIJING UNIV OF TECH
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