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Application of two-dimensional MXene membrane in gas separation

A gas separation and mixed gas technology, applied in semi-permeable membrane separation, hydrogen separation using solid contact, hydrogen separation, etc., can solve the problems of complex preparation process, difficulty in large-scale application, poor thermal stability, etc., and achieve simple preparation process, Reproducible, highly gas-selective results

Active Publication Date: 2017-12-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic polymer membranes were first studied, but there are problems such as poor thermal stability and low permeability.
Subsequent ceramic membranes solved the problem of thermal stability of organic polymer membranes, but the cost is high, the preparation process is complicated, and it is difficult to apply on a large scale.

Method used

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  • Application of two-dimensional MXene membrane in gas separation
  • Application of two-dimensional MXene membrane in gas separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0046] (1) First mix 1g of lithium fluoride with 100ml of hydrochloric acid solution (volume concentration 10%), and then mix 1g of three-dimensional layered Ti 3 AlC 2 The powder was added to the above solution, stirred for 2 h, washed by centrifugation at 1000 rpm, and dried to obtain Ti 3 C 2 powder;

[0047] (2) Add 1g Ti 3 C 2 The powder was mixed with 500 ml ethanol, sonicated for 1 h, and then centrifuged at 500 rpm for 1 h. The obtained supernatant was a solution containing two-dimensional MXene nanosheets with a concentration of 5 mg / ml;

[0048] (3) The above two-dimensional MXene nanosheet solution was deposited on a polyethersulfone filter membrane (PES) substrate with a pore size of 0.5 μm and a diameter of 10 mm by spraying, and dried at 100 ° C for 10 h in a blast drying oven A two-dimensional MXene film can be obtained.

[0049] Application of the two-dimensio...

Embodiment 2

[0052] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0053] (1) First mix 1g lithium bromide with 200ml hydrochloric acid solution (volume concentration 40%), then mix 100g three-dimensional layered Ti 3 AlC 2 The powder was added to the above solution, stirred for 48h, centrifuged and washed at 8000rpm, dried to obtain Ti 3 C 2 powder;

[0054] (2) Add 1g Ti 3 C 2 powder with 2000 ml H 2 O mixed, sonicated for 8h, and then centrifuged at a speed of 5000rpm for 3h, and the resulting supernatant was a solution containing two-dimensional MXene nanosheets with a concentration of 2.5mg / ml;

[0055] (3) The above-mentioned two-dimensional MXene nanosheet solution was deposited on a polyethersulfone filter membrane (PES) substrate with a pore size of 0.5 μm and a diameter of 500 mm by natural drying method, and dried in a vacuum oven at 300 ° C for 48 h A two-dimensional MXene film can be obtained.

[0056] Application of the two-di...

Embodiment 3

[0059] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0060] (1) First mix 1g of lithium bromide with 150ml of nitric acid solution (volume concentration 35%), and then mix 20g of three-dimensional layered Ti 3 AlC 2 The powder was added to the above solution, stirred for 14h, centrifuged and washed at 2000rpm, and dried to obtain Ti 3 C 2 powder;

[0061] (2) Add 5g Ti 3 C 2 The powder was mixed with 500 ml dimethyl sulfoxide, ultrasonicated for 2 hours, and then centrifuged at 5000 rpm for 1 hour. The obtained supernatant was a solution containing two-dimensional MXene nanosheets with a concentration of 0.25 mg / ml;

[0062] (3) The above-mentioned two-dimensional MXene nanosheet solution was deposited on a polyethersulfone filter membrane (PES) substrate with a pore size of 0.5 μm and a diameter of 100 mm by vacuum filtration, and dried in a vacuum oven at 80°C for 12 hours After that, the two-dimensional MXene film can be obta...

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Abstract

The invention discloses application of a two-dimensional MXene membrane in gas separation. The application comprises the following steps: (1) placing the two-dimensional MXene membrane in a gas separation unit, and then, introducing a gas mixture required to be separated from a feed side; (2) introducing purge gas from a purge side; (3) introducing the purge gas to gas chromatography for detecting. The MXene membrane disclosed by the invention has ultrahigh H2 transmittance, ultrahigh H2 / CO2, H2 / N2, H2 / CH4, H2 / C3H6 and H2 / C3H8 separation selectivity and excellent mechanical properties; a preparation method of the two-dimensional MXene membrane is simple and easy in operation, low in energy consumption, low in cost and high in repeatability and is applicable to large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of nano-membrane and membrane-based gas separation, and in particular relates to the application of a two-dimensional MXene membrane in gas separation. Background technique [0002] Since the industrial revolution, separation has been a very important part of industrial production, especially the separation of gases. Traditional gas separation processes include rectification separation and pressure swing adsorption. However, these separation processes have high energy consumption, complex operation, large equipment footprint and low separation efficiency. To solve these problems, researchers are actively developing efficient and sustainable separation techniques. Among them, membrane separation technology represents the development direction of new solutions with its high efficiency and energy saving characteristics. [0003] There are many types of membrane separation materials. Organic polymer membranes were fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D69/12B01D67/00B82Y40/00C01B3/56C01B32/50
CPCB01D53/228B01D67/0079B01D69/12B82Y40/00C01B3/56
Inventor 王海辉丁力魏嫣莹王莹
Owner SOUTH CHINA UNIV OF TECH
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