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Two-dimensional MXene membrane with vertical channel structure and preparation method thereof

A vertical channel, drying technology, applied in the field of MXene membrane, can solve the problems of reduced transmission rate, easy re-stacking and agglomeration, etc., to achieve the effect of excellent specific surface area, simple method, and green process.

Active Publication Date: 2019-05-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the film prepared by horizontal stacking of two-dimensional nanosheets, the molecules transported in the film must continue to diffuse to the other side through the tortuous interlayer channels, so the transport rate will be significantly reduced as the thickness increases, and at the same time, it is easy to re-accumulate and reunion

Method used

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  • Two-dimensional MXene membrane with vertical channel structure and preparation method thereof

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Effect test

Embodiment 1

[0039] A preparation method of a two-dimensional MXene film with a vertical pore structure, comprising the following steps:

[0040] (1) Add 7g of lithium fluoride to 200mL of 6mol / L hydrochloric acid solution, stir well, then add 4g of Ti 3 AlC 2 powder, stirred and reacted for 36 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;

[0041] (2) 1g Ti 3 C 2 The powder was added to 500mL deionized water, ultrasonicated for 1 hour, centrifuged at 2500rpm for 1h, and the upper liquid was absorbed to obtain a solution of two-dimensional MXene nanosheets with a concentration of 2mg / mL;

[0042] (3) Take 40mL of the MXene nanosheet solution obtained in step (2), add 10mL of water, insert the working electrode conductive glass FTO and the counter electrode into the solution, apply a DC voltage of 15V, and take it out after 4min;

[0043] (4) The substrate deposited with MXene nan...

Embodiment 2

[0047] A preparation method of a two-dimensional MXene film with a vertical pore structure, comprising the following steps:

[0048] (1) Add lithium fluoride (10g) into hydrochloric acid solution (12mol / L, 150mL), stir evenly, add 8g of MAX powder (V 2 AlC), stirred at 500rpm for 24h, centrifuged at 2500rpm for 10min, washed with deionized water until the pH was 7, and dried at 80°C for 16h to obtain MXene powder;

[0049] (2) Disperse the MXene powder into water, sonicate for 2 hours, centrifuge, and take the upper layer solution, which is the MXene nanosheet solution with a concentration of 1 mg / mL;

[0050] (3) Take 25mL of the MXene nanosheet solution obtained in step (2), add 10mL of water, insert the working electrode base porous stainless steel mesh and the counter electrode into the solution, apply a 20V DC voltage, and take it out after 3min;

[0051] (4) Put the substrate deposited with MXene nanosheets into a liquid nitrogen environment to cool for 8 minutes (-196°...

Embodiment 3

[0053] A preparation method for a two-dimensional MXene film, comprising the following steps:

[0054] (1) Add lithium fluoride (8g) into hydrochloric acid solution (12mol / L, 100mL), stir well, add 10g of MAX powder (Ti 2 AlC), stirred at 350rpm for 24h, centrifuged at 2500rpm for 10min, washed with deionized water until the pH was 6, and dried at 80°C for 16h to obtain MXene powder;

[0055] (2) Disperse the MXene powder into water, sonicate for 1.5h, centrifuge, and take the upper layer solution, which is the MXene nanosheet solution with a concentration of 2mg / mL;

[0056] (3) Take 30mL of the MXene nanosheet solution obtained in step (2), add 10mL of water, insert the working electrode substrate titanium sheet and the counter electrode into the solution, apply a 5V DC voltage, and take it out after 10min;

[0057] (4) Put the substrate containing a large number of MXene nanosheets into a liquid nitrogen environment to cool for 4 minutes (-196°C), take it out and transfer ...

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Abstract

The invention belongs to the technical field of MXene membranes, and discloses a two-dimensional MXene membrane with a vertical channel structure and a preparation method thereof. The method comprisesthe following steps that (1) etching is conducted on MAX powder under the action of hydrochloric acid and lithium fluoride, and centrifugation, washing, drying and ultrasonic dispersing are conductedto obtain an MXene nanosheet solution; and (2) electrophoretic deposition is conducted on the MXene nanosheet solution, the product is taken out for freezing treatment and drying to obtain the MXenemembrane with the vertical channel structure, wherein the conditions of the electrophoretic deposition comprise 1-36V voltage and 10s-30min duration, and the temperature of the freezing treatment ranges from minus 196 DEG C to minus 100 DEG C. According to the method, the simple, green and environment-friendly effects are achieved, the prepared membrane is provided with the vertical channel structure, so that the membrane penetration rate of molecules can be increased, and the membrane prepared through the method has extensive application prospect in the fields of energy storage, catalysis, photoelectric materials, biological medicines, electromagnetic shielding, wave absorbing materials and the like.

Description

technical field [0001] The invention belongs to the technical field of MXene membranes, in particular to an MXene membrane with a vertical channel structure and a preparation method thereof. Background technique [0002] Due to the size effect, nanomaterials have much better physical and chemical properties than macroscopic bulk materials, so they have attracted extensive attention. The performance of functional nanomaterials largely depends on their morphology, size, and crystal phase structure. Fine regulation of their microstructure to achieve structural design and controllable construction has become a hot area of ​​scientific research on nanomaterials in recent years. [0003] In recent years, graphene oxide membranes have developed rapidly in the field of ion separation. Similar two-dimensional nano-membrane materials have attracted widespread attention in the scientific research community due to their good mechanical properties, high chemical stability, simple prepara...

Claims

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Application Information

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IPC IPC(8): C25D13/02
Inventor 魏嫣莹邓俊杰王海辉李理波卢纵
Owner SOUTH CHINA UNIV OF TECH
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