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Application of a two-dimensional mxene membrane in the separation of water and ethanol

A technology of ethanol and ethanol aqueous solution, which is applied in the field of nano-membrane and liquid separation, can solve the problems of high energy consumption, complicated procedures, difficulty in balancing selectivity and permeation, and achieve low cost, simple preparation, high permeation and selectivity Effect

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated procedures and huge energy consumption. If the membrane separation method is used to separate water and ethanol, the separation efficiency can be greatly improved and energy consumption can be reduced.
At present, the traditional liquid separation membranes that can be commercialized include polymer membranes and molecular sieve membranes, which have defects such as poor stability, difficulty in balancing selectivity and permeation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0031] (1) Add 8g lithium fluoride to 200mL 6mol L -1 hydrochloric acid solution, stir evenly, then add 5gTi 3 AlC 2 powder, stirred and reacted for 48 hours, centrifuged and washed at 2500rpm until the pH of the upper solution was neutral, and then dried at 50°C for 48 hours to obtain Ti 3 C 2 powder;

[0032] (2) Add 0.1g Ti 3 C 2 The powder was added to 500mL deionized water, ultrasonicated for 1 hour, centrifuged at 2500rpm for 1 hour, and the upper liquid was absorbed to obtain a two-dimensional MXene nanosheet solution with a concentration of 0.1mg·mL;

[0033] (3) Take 10mL of the MXene nanosheet solution obtained in step (2), and use a vacuum filtration device to stack the MXene nanosheets on a nylon 66 substrate with a pore size of 200nm and a diameter of 50mm, and then dry it in a blast drying oven at 100°C After 10 hours, a two-dimensional MXene film with a thickne...

Embodiment 2

[0038] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0039] (1) Add 8g lithium fluoride to 200mL 6mol L -1 hydrochloric acid solution, stir evenly, then add 5gTi 3 AlC 2 powder, stirred and reacted for 48 hours, centrifuged and washed at 2500rpm until the pH of the upper solution was neutral, and then dried at 50°C for 48 hours to obtain Ti 3 C 2 powder;

[0040] (2) Add 3g Ti 3 C 2 The powder was added to 500mL deionized water for 1 hour, centrifuged at 2500rpm for 1 hour, and the upper liquid was absorbed to obtain a two-dimensional MXene nanosheet solution with a concentration of 5mg mL;

[0041] (3) Take 50mL of the MXene nanosheet solution obtained in step (2), and use a vacuum filtration device to stack the MXene nanosheets on a nylon 66 substrate with a pore size of 200nm and a diameter of 50mm, and then dry it in a 100°C blast drying oven After 10 hours, a two-dimensional MXene film with a thickness of 5 mm was obtained...

Embodiment 3

[0046] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0047] (1) Add 8g lithium fluoride to 200mL 6mol L -1 hydrochloric acid solution, stir evenly, then add 5gTi 3 AlC 2 powder, stirred and reacted for 48 hours, centrifuged and washed at 2500rpm until the pH of the upper solution was neutral, and then dried at 50°C for 48 hours to obtain Ti 3 C 2 powder;

[0048] (2) Put 10g Ti 3 C 2 The powder was added to 500mL deionized water, ultrasonicated for 1 hour, centrifuged at 2500rpm for 1 hour, and the upper liquid was absorbed to obtain a solution of two-dimensional MXene nanosheets with a concentration of 15mg mL;

[0049] (3) Take 50mL of the MXene nanosheet solution obtained in step (2), and use a vacuum filtration device to stack the MXene nanosheets on a nylon 66 substrate with a pore size of 200nm and a diameter of 50mm, and then dry it in a blast drying oven at 150°C After 10 hours, a two-dimensional MXene film with a thickne...

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PUM

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Abstract

The invention discloses an application of a two-dimensional MXene membrane in the separation of water and ethanol, and belongs to the fields of two-dimensional nanometer membrane preparation technology and liquid separation technology. The application includes the following steps: (1) Put the two-dimensional MXene membrane into the pervaporation device, add ethanol aqueous solution on the raw material side; (2) Use a vacuum pump to vacuum the permeate side, and pass the permeated vapor into the cold trap to condense ; (3) Collect the permeate in the cold trap, and use gas chromatography to detect the concentration of the permeate. The present invention puts a two-dimensional MXene membrane with good mechanical properties and excellent separation performance into a pervaporation device for the separation of water and ethanol, which has high selectivity and good chemical stability, and is used in the field of liquid separation Potential for industrial application.

Description

technical field [0001] The invention belongs to the technical field of nanometer membrane and liquid separation, and in particular relates to the application of a two-dimensional MXene membrane in the separation of water and ethanol. Background technique [0002] With the shortage of global resources and the increasingly serious form of environmental pollution, people are constantly pursuing high-efficiency and energy-saving chemical production methods. Separation is a very important link in the chemical production process. In the field of liquid separation, traditional separation methods such as rectification are complex in operation and consume a lot of energy. However, the membrane separation method that has emerged in the past decade has significant advantages, which can greatly reduce energy consumption and improve separation efficiency, which has become a new direction for future development. [0003] Ethanol is an important chemical raw material, widely used in real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36
CPCB01D61/362
Inventor 王海辉吴艺魏嫣莹丁力
Owner SOUTH CHINA UNIV OF TECH