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Preparation method and application method of graphene oxide/carbon nanotube asymmetric separation membrane

A technology of carbon nanotubes and application methods, which is applied in the field of membrane separation water treatment, can solve the problems of membrane water permeability limitation, reduction of graphene oxide oxygen-containing functional groups, reduction of interception performance, etc., to achieve enhanced ion interception performance and enhanced ion partitioning effect , The effect of ion retention improvement

Active Publication Date: 2021-03-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the reduction of the distance between the membrane layers, the water permeability of the membrane will be greatly limited.
In addition, reduction and crosslinking will also reduce the oxygen-containing functional groups on the surface of graphene oxide, resulting in a decrease in the retention performance, especially for ion retention.

Method used

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  • Preparation method and application method of graphene oxide/carbon nanotube asymmetric separation membrane
  • Preparation method and application method of graphene oxide/carbon nanotube asymmetric separation membrane
  • Preparation method and application method of graphene oxide/carbon nanotube asymmetric separation membrane

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Experimental program
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Effect test

Embodiment 1

[0040] The invention provides a preparation method of a graphene oxide / carbon nanotube asymmetric separation membrane, which is specifically implemented according to the following steps:

[0041] (1) Use a mixed acid solution of 70wt.% concentrated nitric acid and concentrated sulfuric acid with v / v of 1:3 to acidify carbon nanotubes with an outer diameter of 10-20 nm, and oxidize at 80°C for 1 h to obtain acidified carbon nanotubes Tube. The acidified carbon nanotubes were then placed in high-purity water, dispersed uniformly by ultrasonic, and prepared to a concentration of 0.2 mg mL. -1 of carbon nanotube dispersions. Subsequently, 40 mL of the carbon nanotube dispersion liquid was suction filtered onto the polyvinylidene fluoride microfiltration membrane substrate through a vacuum filtration device, and dried at 60 °C for 2 h to form a carbon nanotube layer;

[0042] (2) Using 8000 mesh graphite powder to prepare graphene oxide by Hummers method, and uniformly dispersing...

Embodiment 2

[0048] The invention provides a preparation method of a graphene oxide / carbon nanotube asymmetric separation membrane, which is specifically implemented according to the following steps:

[0049] (1) Use a mixed acid solution of 70wt.% concentrated nitric acid and concentrated sulfuric acid with a v / v of 1:3 to acidify carbon nanotubes with an outer diameter of 8-15nm, and oxidize at 60°C for 2h to obtain acidified carbon nanotubes Tube. The acidified carbon nanotubes were then placed in high-purity water, dispersed uniformly by ultrasonic, and prepared to a concentration of 0.2 mg mL. -1 of carbon nanotube dispersions. Subsequently, 50 mL of the carbon nanotube dispersion liquid was suction filtered onto the polyethersulfone ultrafiltration membrane substrate through a vacuum filtration device, and dried at 80 °C for 2 h to form a carbon nanotube layer;

[0050] (2) Using 2000 mesh graphite powder to prepare graphene oxide by Hummers method, and uniformly dispersing graphen...

Embodiment 3

[0056] The invention provides a preparation method of a graphene oxide / carbon nanotube asymmetric separation membrane, which is specifically implemented according to the following steps:

[0057] (1) Using a mixed acid solution of 70wt.% concentrated nitric acid and concentrated sulfuric acid with a v / v of 1:3 to acidify carbon nanotubes with an outer diameter of 20-40nm, and oxidize at 100°C for 0.5h to obtain acidified carbon nanotube. The acidified carbon nanotubes were then placed in high-purity water, dispersed uniformly by ultrasonic, and prepared to a concentration of 0.2 mg mL. -1 of carbon nanotube dispersions. Subsequently, 60 mL of the carbon nanotube dispersion liquid was suction filtered onto the cellulose acetate microfiltration membrane substrate through a vacuum filtration device, and dried at 80 °C for 2 h to form a carbon nanotube layer;

[0058] (2) Using 325 mesh graphite powder to prepare graphene oxide by Hummers method, and uniformly dispersing graphen...

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Abstract

The invention belongs to the technical field of membrane separation water treatment, and provides a preparation method and an application method of a graphene oxide / carbon nanotube asymmetric separation membrane. The preparation method comprises the following steps: subjecting acidified carbon nanotubes to vacuum filtration onto a support membrane substrate to form a carbon nanotube layer of the separation membrane; and then preparing a mixed solution of graphene oxide, diamine and polyelectrolyte, and subjecting the mixed solution to vacuum filtration on to the carbon nanotube layer so as toform the graphene oxide / carbon nanotube asymmetric separation membrane. The application method comprises the following steps: taking the carbon nanotube layer of the graphene oxide / carbon nanotube asymmetric separation membrane as a working electrode, applying a voltage, enabling a graphene oxide layer to be positioned between the working electrode and a counter electrode, and performing electricfield assisted membrane filtration by adopting a cross-flow filtration mode. The preparation method provided by the invention is simple and easy to operate, and expensive raw materials and equipment are not needed; and water flux and ion interception performance can be improved at the same time under the auxiliary effect of an electric field.

Description

technical field [0001] The invention relates to the technical field of membrane separation water treatment. Background technique [0002] As one of the most promising high-tech technologies, membrane separation technology plays an increasingly important role in many fields, especially in the field of water treatment. The development of new separation membranes with high flux and high rejection performance is of great significance to promote the further application of membrane separation technology in the field of water treatment. [0003] Graphene oxide has atomic thickness, high mechanical strength, good acid and alkali resistance, and tunable physicochemical properties, and has great potential in building high-performance separation membranes. The graphene oxide two-dimensional layered membrane can be easily prepared by simple vacuum filtration, spraying, self-assembly and other methods. Graphene oxide membranes possess tunable nanochannels and abundant oxygen-containing...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00B01D71/02
CPCB01D71/34B01D71/021B01D69/12B01D67/0079
Inventor 全燮张海光陈硕于洪涛王旭
Owner DALIAN UNIV OF TECH
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