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Preparation method of composite membrane containing oxidized graphene

A composite membrane and graphene technology, applied in the field of membrane separation, can solve the problems of limiting the structural properties of graphene oxide, unfavorable application in the field of separation membrane preparation, long preparation time, etc., to improve water flux and retention rate, and the preparation method is simple. , The effect of high preparation efficiency

Active Publication Date: 2015-10-28
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since graphene oxide is easy to agglomerate and difficult to disperse in most polymers, the blending method limits the structural characteristics of graphene oxide, which is not conducive to the application in the field of separation membrane preparation
However, the traditional layer-by-layer self-assembly has the problems of long preparation time and low efficiency.

Method used

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  • Preparation method of composite membrane containing oxidized graphene
  • Preparation method of composite membrane containing oxidized graphene
  • Preparation method of composite membrane containing oxidized graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In the embodiment of the present invention, the polyacrylonitrile (PAN) base film was immersed in a 0.5 mol / L NaOH solution for alkali treatment for 1.5 h to obtain a charged H-PAN base film with a surface charge. The prepared charged base film was placed in the middle of an electric field composed of two graphite plates, and a distance of 2 cm was kept between the charged base film and the two electrodes. Add 1g / L positively charged polyetherimide to the electric field, turn on the power supply, and keep it energized at 5V for 3 minutes to obtain a composite film with a positively charged surface, and place the composite film in the air for 5 minutes until drained. Put the composite film in the middle of the electric field again, change the direction of the positive and negative poles of the power supply, add 1g / L negatively charged graphene oxide in the electric field, turn on the power supply, and keep it powered on for 3min at a current of 5V, so that the negatively ...

Embodiment 2

[0032] In the embodiment of the present invention, the base film of polyacrylonitrile (PAN) was immersed in a 0.5 mol / L NaOH solution for 1.5 hours of alkali treatment to obtain a charged H-PAN base film with a surface charge. The prepared charged base film was placed in the middle of an electric field composed of two graphite plates, and a distance of 4 cm was kept between the charged base film and the two electrodes. Add 1g / L positively charged polyallylamine hydrochloride to the electric field, turn on the power supply, and keep electrifying at 3V for 3min to obtain a positively charged composite film on the surface, and place the composite film in the air for 10min until Drain. Put the composite film in the middle of the electric field again, change the direction of the positive and negative electrodes of the power supply, add 0.025g / L negatively charged graphene oxide into the electric field, turn on the power supply, and keep electrifying at a current of 3V for 3min to m...

Embodiment 3

[0035]In the embodiment of the present invention, a positively charged polyamideimide (PAI) base film is placed in the middle of an electric field composed of two copper electrode plates, and a distance of 2 cm is maintained between the base film and the two electrodes. Add 1g / L negatively charged graphene oxide in the electric field, turn on the power supply, and keep it on for 3 minutes at 5V to obtain a composite film with a negatively charged surface, and place the composite film in the air for 10 minutes until drained. Put the composite film in the middle of the electric field again, change the direction of the positive and negative poles of the power supply, add 1g / L positively charged cationic acrylamide into the electric field, turn on the power supply, and keep electrifying at a current of 5V for 3min to make the positively charged cationic acrylamide Amides are enriched around the composite membrane and deposited on the surface of the composite membrane through electr...

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Abstract

The invention discloses a preparation method of a composite membrane containing oxidized graphene. The preparation method comprises the steps: modifying a basement membrane to obtain a charged basement membrane; placing the charged basement membrane in the middle of an electric field formed by two battery lead plates, adding polyelectrolyte with the electrical property contrary to that of the charged basement membrane, and enabling the polyelectrolyte to deposit on the surface of the charged basement membrane after electrifying, so as to prepare the composite membrane; placing the composite membrane of which the surface is enriched with charged polyelectrolyte into air for draining off; placing the composite membrane in the middle of the electric field again, changing the directions of positive and negative electrodes of a power source, adding the oxidized graphene with the electrical property contrary to that of the charged polyelectrolyte into the electric field, and enabling the oxidized graphene to deposit on the surface of the composite membrane after electrifying; repeating the method, so as to obtain the composite membranes containing the oxidized graphene with different layers. The preparation method provided by the invention is simple, and high in preparing efficiency, and improves the water flux and the reject rate of the composite membrane, the surface hydrophilicity and the water permeability of the composite membrane are good, and the composite membrane has wide application prospect in the fields of water treatment and membrane separation.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a composite membrane containing graphene oxide. Background technique [0002] With the development of seawater desalination, membrane separation technology has played an increasingly important role in the field of water treatment in recent years with its advantages of high efficiency, energy saving, environmental protection and economy. Designing and preparing new and efficient separation membranes has become the key to the further development of membrane water treatment technology. The development of new composite membrane materials to achieve efficient and environmentally friendly water treatment processes is the current development trend in the field of membrane materials. Graphene oxide has a unique single-layer carbon atom structure, and its sheets and edges contain a large number of hydroxyl, carboxyl, epoxy and other groups, which have h...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/26B01D71/40B01D71/42B01D69/12B01D67/00
Inventor 王志宁王涛宋向菊高翔
Owner OCEAN UNIV OF CHINA
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