Preparation and application of functionalized graphene oxide composite membrane

A composite and functional technology of graphene, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of low selectivity, uncontrollable layer spacing, weak size screening ability, etc., and achieve the goal of preparing The method is simple and the effect of excellent comprehensive performance

Inactive Publication Date: 2016-11-02
TIANJIN UNIV
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  • Abstract
  • Description
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AI Technical Summary

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

[0015] Embodiment 1, the preparation of functionalized graphene oxide composite film, the steps are as follows:

[0016] Step 1, prepare the massfraction by Hummer method and be the water dispersion liquid of the graphene oxide of 1mg / L, wherein, the size of graphene oxide flake (because the planar geometry of graphene oxide flake is not the circle of standard, so The size of this place actually refers to the diameter of the circumscribed circle of the graphene oxide sheet plane shape profile) is 500nm, placed in an ultrasonic frequency of 30kHz ultrasonic cleaner for dispersing 2h;

[0017] Step 2, adding polyoxyethylene diamine with a molecular weight of 500 to the above-mentioned graphene oxide aqueous dispersion, wherein the mass ratio of polyoxyethylene diamine to graphene oxide is 10 / 1; heating the solution to 40°C , stirred mechanically for 1 h until completely dissolved, cooled to room temperature to obtain solution A;

[0018] Step 3: Fix the polyethersulfone microfi...

Embodiment 2

[0021] Example 2, the preparation of functionalized graphene oxide composite film, the preparation method is basically the same as that of Example 1, except that the size of the graphene oxide sheet in step 1 is 2 μm.

[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 108GPU, CO 2 / N 2 The separation factor is 40, under the same conditions, the separation of CO 2 30% CH by volume 4 -CO 2 Binary gas mixture, CO 2 Penetration rate is 113GPU, CO 2 / CH 4 The separation factor was 58.

Embodiment 3

[0023] Example 3, the preparation of functionalized graphene oxide composite membrane, the preparation method is basically the same as that of Example 2, except that in step 2, the molecular weight of the polyoxyethylene diamine is 1000.

[0024] 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 220GPU, CO 2 / N 2 The separation factor is 55, under the same conditions, the separation of CO 2 30% CH by volume 4 -CO 2 Binary gas mixture, CO 2 Penetration rate is 216GPU, CO 2 / CH 4 The separation factor was 42.

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Abstract

Belonging to the technical field of gas separation membranes, the invention discloses a preparation method and application of a functionalized graphene oxide composite membrane. The preparation process includes: preparing an aqueous dispersion of graphene oxide by Hummer method and conducting ultrasonic dispersion; adding polyethylene glycol diamine, and carrying out heating stirring; covering a micro-filtration membrane surface with the prepared dispersion by vacuum pumping filtration; and placing the membrane into a drying oven to perform drying. The preparation method provided by the invention is simple, the prepared membrane has a thickness of less than 10nm, and the graphene interlamellar spacing is adjustable, the prepared composite membrane can be used for gas separation, and has excellent comprehensive performance. In particular, the graphene oxide composite membrane prepared from polyethylene glycol diamine with a molecular weight of 1000 has high CO2 permeation flux and CO2 / CH4, CO2 / N2 selectivity, mixed gas test under a dry condition finds that the CO2 permeation flux can reach 220GPU, the CO2 / CH4 selectivity is 42, and the CO2 / N2 selectivity is 55.

Description

technical field [0001] The invention relates to the preparation and application of a functionalized 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 ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/34B01D71/16B01D69/12B01D67/00B01D53/22
CPCB01D53/228B01D67/0006B01D69/125B01D71/16B01D71/34B01D71/68Y02C20/40
Inventor 姜忠义王少飞张宁霍亭丞张喜园
Owner TIANJIN UNIV
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