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A kind of preparation method of mxene nanofiltration membrane

A nanofiltration membrane and nanosheet technology, which is applied in the field of preparation of new MXene nanofiltration membranes, can solve the problem that MXenes have no two-dimensional sheet structure under etching conditions, and achieve the effect of good interception performance and increased water flux.

Active Publication Date: 2022-03-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, stronger energy is required in the selective etching process, and the harsh etching conditions lead to the fact that the prepared MXenes often do not have a good two-dimensional sheet structure.
Therefore, how to prepare MXenes with good two-dimensional sheet structure and high-performance MXenes membrane is still a big challenge.

Method used

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  • A kind of preparation method of mxene nanofiltration membrane
  • A kind of preparation method of mxene nanofiltration membrane
  • A kind of preparation method of mxene nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Ti 3 CNT x / CNT nanofiltration membrane preparation

[0031] Take 1g Ti 3 Al(C,N) 2 Soak the powder in 100ml of aqueous solution containing 0.5g of ammonium hydrofluoride, stir for 72h, and after centrifugal drying, take 0.1g of dried MXene powder and put it into a tube furnace for water vapor stripping. The water content of the gas is 10vol%, and the water vapor heating temperature is 500 degrees, heat treatment time is 1h. The powder after heat treatment and stripping is dried and set aside. Afterwards, take 0.2 g of purchased single-walled carbon nanotubes (Aladdin’s reagent) (2nm in diameter, 0.3-5 μm in length) and place them in 50ml of water for ultrasonic dispersion. After the dispersion is complete, add 1 g of stripped MXene powder, continue ultrasonic dispersion, and finally pass The prepared solution is suction-filtered on a ceramic substrate to form a film by suction filtration.

[0032] Membrane flux test is carried out under 0.1Mpa pressure, prepare 1...

Embodiment 2

[0034] Zr 3 C 2 T x / CNT nanofiltration membrane preparation

[0035] Take 1g Zr 3 Al 3 C 2 Soak the powder in 100ml of aqueous solution containing 0.5g of ammonium hydrofluoride, stir for 72h, and after centrifugal drying, take 0.1g of dried MXene powder and put it into a tube furnace for water vapor stripping. The water content of the gas is 10vol%, and the water vapor heating temperature is 500 degrees, heat treatment time is 10h. The powder after heat treatment and stripping is dried and set aside. Afterwards, take 0.2 g of purchased single-walled carbon nanotubes (Aladdin’s reagent) (2nm in diameter, 0.3-5 μm in length) and place them in 50ml of water for ultrasonic dispersion. After the dispersion is complete, add 1 g of stripped MXene powder, continue ultrasonic dispersion, and finally pass The prepared solution is suction-filtered on a ceramic substrate to form a film by suction filtration.

[0036] Membrane flux test is carried out under 0.1Mpa pressure, prepa...

Embodiment 3

[0038] Ti 4 N 3 T x / CNT nanofiltration membrane preparation

[0039] Take 1g Ti 4 AlN 3Soak the powder in 100ml of aqueous solution containing 0.5g of ammonium hydrofluoride, stir for 72h, and after centrifugal drying, take 0.1g of dried MXene powder and put it into a tube furnace for water vapor stripping. The water content of the gas is 10vol%, and the water vapor heating temperature is 500 degrees, heat treatment time is 5h. The powder after heat treatment and stripping is dried and set aside. Afterwards, take 0.2 g of purchased single-walled carbon nanotubes (Aladdin’s reagent) (2nm in diameter, 0.3-5 μm in length) and place them in 50ml of water for ultrasonic dispersion. After the dispersion is complete, add 1 g of stripped MXene powder, continue ultrasonic dispersion, and finally pass The prepared solution is suction-filtered on a ceramic substrate to form a film by suction filtration.

[0040] Membrane flux test is carried out under 0.1Mpa pressure, prepare 1g ...

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Abstract

The invention provides a method for preparing MXene nanofiltration membranes. The invention uses ammonium hydrofluoride to etch a series of MAX materials to obtain the required MXene block materials, and decomposes the bulk MXene into small pieces by water vapor stripping. The nanosheets, and then use the solution intercalation method to embed the tiny single-walled carbon nanotubes in the MXene nanosheets, and then prepare a new type of MXene nanofiltration membrane by means of vacuum filtration. The MXene nanofiltration membrane prepared by the present invention Has high flux and retention characteristics.

Description

(1) Technical field [0001] The invention belongs to the technical field of separation of inorganic membrane materials, and in particular relates to a preparation method of a novel MXene nanofiltration membrane. (2) Background technology [0002] 2D materials have been widely studied and discussed because of their unique electronic, mechanical, magnetic and optical properties. The most studied so far is graphene oxide (GO), an atomically thin layer built from sp2-bonded C atoms. Recently, a new family of 2D materials has been mentioned, including the emergence of pre-transition metal carbides, nitrides, and carbonitrides, becoming the latest class of 2D functional materials, called MXenes. The origin of MXenes is obtained by selectively etching the A atomic layer in the three-dimensional solid phase MAX. Now all known MAX is a layered hexagonal P63 / mmc symmetric ternary structure, and its crystal structure is M n+1 AX n , where M represents the early transition metals (su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/00C02F1/44C02F101/30
CPCB01D61/027B01D67/0039B01D71/02C02F1/442C02F2101/308
Inventor 张国亮徐泽海
Owner ZHEJIANG UNIV OF TECH
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