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Preparation method and application of graphene oxide composite membrane

A graphene composite and fossil technology, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problems of low selectivity, uncontrollable layer spacing, weak size screening ability, etc., and achieve simple preparation methods, The effect of excellent comprehensive performance

Inactive Publication Date: 2016-07-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the uncontrollable layer spacing of the prepared membrane, the size screening ability of the membrane is weak and the selectivity is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The preparation method of embodiment 1, graphene oxide composite membrane may further comprise the steps:

[0014] Step 1, preparing an aqueous dispersion of graphene oxide by the Hummer method, the size of the graphene oxide sheet is 500nm, and placing it in an ultrasonic cleaner with an ultrasonic frequency of 30kHz for 2 hours;

[0015] Step two, MgCl 2 Join in the graphene oxide aqueous dispersion that graphene oxide mass volume ratio is 1mg / L and obtain solution A, wherein added MgCl 2 The mass ratio to graphene oxide is 10 / 1; heat the solution A to 40°C, mechanically stir for 1h to dissolve the MgCl in it 2 Dissolve completely and cool to room temperature for later use;

[0016] Step 3. Fix the polyethersulfone microfiltration membrane in the vacuum filtration cup, take 40ml of the solution A prepared in step 2 and pour it into the vacuum filtration cup, turn on the vacuum pump, and continue the suction filtration for 20 minutes after the water is completely fil...

Embodiment 2

[0019] Embodiment 2, the preparation method of graphene oxide composite film, the preparation process is basically consistent with embodiment 1, the difference is: the salt added in step 2 is CaCl 2 .

[0020] Test condition is identical with embodiment 1, separates CO 2 20% N by volume 2 -CO 2 Binary gas mixture, CO 2 Penetration rate is 52GPU, CO 2 / N 2 The separation factor is 16, under the same conditions, the separation of CO 2 30% CH by volume 4 -CO 2 Binary gas mixture, CO 2 Penetration rate is 51GPU, CO 2 / CH 4 The separation factor was 13.

Embodiment 3

[0021] Embodiment 3, the preparation method of graphene oxide composite film, the preparation process is basically consistent with embodiment 1, the difference is: the salt added in step 2 is ZnCl 2 .

[0022] Test condition is identical with embodiment 1, separates CO 2 20% N by volume 2 -CO 2 Binary gas mixture, CO 2 Penetration rate is 70GPU, CO 2 / N 2 The separation factor is 28, under the same conditions, the separation of CO 2 30% CH by volume 4 -CO 2 Binary gas mixture, CO 2 Penetration rate is 72GPU, CO 2 / CH 4 The separation factor was 31.

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Abstract

The invention discloses a preparation method and application of a graphene oxide composite membrane, and belongs to the technical field of gas separation membranes.The preparation method of the graphene oxide composite membrane comprises the steps that an aqueous dispersion liquid of graphene oxide is prepared through a Hummer method, and ultrasonic dispersion is conducted; metal salt or oxysalt is added, and heating and mixing are conducted; the surface of a micro-filtration membrane is covered with the prepared dispersion liquid through a vacuum filtration method; the membrane is put into a drying oven to be dried.The preparation method of the graphene oxide composite membrane has the advantages that the preparation method is simple, the thickness of the obtained membrane is smaller than 10 nm, the space between graphene sheet layers is adjustable, the obtained composite membrane is used for gas separation and has excellent comprehensive performance.Particularly, the graphene oxide composite membrane prepared from sodium tetraborate has high CO2 permeation flux and CO2 / CH4 and CO2 / N2 selectivity, and it is obtained through mixed gas tests under the humidifying condition that the CO2 permeation flux can reach 650 GPU, CO2 / CH4 selectivity is 75, and CO2 / N2 selectivity is 58.

Description

technical field [0001] The invention relates to the preparation and application of a graphene oxide composite membrane, belonging to the technical field of gas membrane separation. Background technique [0002] In recent years, with the development of industry, the combustion of fossil fuels has produced a large amount of CO 2 gas. There is an urgent need for efficient and low-cost carbon capture technologies. Membrane technology has attracted widespread attention due to its advantages of greenness, low energy consumption, and low equipment investment, and is one of the technologies expected to be adopted on a large scale. At present, due to the low separation performance of membrane materials, its further development is limited. Designing and preparing membrane materials with high permeability and high selectivity is a hot research topic at present. In order to achieve high permeability and high selectivity of the membrane, the membrane material should have an ultra-thi...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/36B01D71/16B01D71/68B01D69/12B01D67/00B01D53/22
CPCB01D71/021B01D53/228B01D67/0079B01D69/12B01D71/16B01D71/36B01D71/68
Inventor 姜忠义王少飞谢煜张博风田志章
Owner TIANJIN UNIV
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