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Method for preparing MXenes and derivative nanosheets by electrochemical process

A derivative, nanosheet technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, carbides, etc., can solve problems such as long etching time, health hazards, environmental pollution, etc. The effect of low preparation cost and shortened reaction time

Active Publication Date: 2019-04-30
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high concentrations of hydrofluoric acid and hydrochloric acid are very dangerous, harmful to health, and easily cause environmental pollution
In addition, these conventional methods for exfoliating MXenes require long etching times, and tedious steps such as subsequent intercalation, delamination, and centrifugation.

Method used

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  • Method for preparing MXenes and derivative nanosheets by electrochemical process
  • Method for preparing MXenes and derivative nanosheets by electrochemical process
  • Method for preparing MXenes and derivative nanosheets by electrochemical process

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The process steps of the method for electrochemically preparing MXenes and derivative nanosheets thereof involved in this embodiment are as follows:

[0020] S1. Weigh 1.43g of powder and put it in a 50mL beaker, add 50mL of deionized water into the beaker containing the powder, and put it on a magnetic stirrer to completely dissolve the ammonium bifluoride powder;

[0021] S2, put the big Ti 3 AlC 2 MAX is fixed on the clip electrode as an anode, Pt sheet electrode (area>1.0cm 2 ) as the cathode, and apply a DC constant voltage of 3V, and react for 6-24 hours;

[0022] S3. After the reaction, take out the electrolyte in the beaker and put it into the centrifuge tube, place the centrifuge tube symmetrically in the centrifuge, centrifuge at a speed greater than 7000 rpm for more than 10 minutes, take the supernatant, and after centrifugation The electrolyte changed from colorless to light yellow to dark brown and then to light yellow.

Embodiment 2

[0024] The Ti prepared in this embodiment to embodiment 1 3 C 2 T x In different reaction systems of MXene and its derivative nanosheets, the UV absorbance of 3,3',5,5'-tetramethylbenzidine at a wavelength of 652nm was measured as a function of time, as shown in image 3 As shown, in the system containing 3,3',5,5'-tetramethylbenzidine, hydrogen peroxide and nanosheets, the reaction solution gradually turns blue, which proves that the nanosheets have peroxidase activity .

Embodiment 3

[0026] The Ti prepared in this embodiment to embodiment 1 3 C 2 T x MXene and its derivative nanosheets eliminate superoxide radicals, such as Figure 4 As shown in A, adding nanosheets to the mixed solution containing riboflavin, methionine and nitro blue tetrazolium, under the condition of light irradiation, its ultraviolet absorbance at 560nm decreased, indicating that it eliminated the ultra-violet Oxygen free radicals; such as Figure 4 As shown in B, with the increase of the concentration of nanosheets, the ultraviolet absorbance at 560nm gradually decreases, indicating that the content of eliminating superoxide radicals gradually increases, proving that the nanosheets have the activity of superoxide dismutase.

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Abstract

The invention belongs to the technical field of preparation of MXenes and derivative nanosheets thereof, and relates to a method for preparing MXenes and derivative nanosheets by an electrochemical process. The method comprises the following steps: weighing 1.43 g of ammonium bifluoride powder, 0.93 g of ammonium fluoride powder and 1.55 g of sodium bifluoride powder, respectively placing above powders in a 50 mL beaker, taking and adding 50 mL of deionized water into the beaker containing the powders, placing the beaker on a magnetic stirrer, and completely dissolving the ammonium bifluoridepowder; fixing a large block of Ti3AlC2MAX to a clip electrode to form as an anode, using a Pt sheet electrode (with an area of above 1.0 cm<2>) as a cathode, applying a direct current constant voltage of 3 V, and performing a reaction for 6-24 h; and performing centrifugation to obtain the product. Compared with the prior art, the method has the advantages of avoiding of a mixture of fluoride andhigh-concentration hydrofluoric acid or hydrochloric acid by using low-concentration ammonium bifluoride in the preparation process, non-toxicity, low hazards, elimination of potential hazardous processes, greenness and environmental protection; and electrolysis of the large block of MAX using the through electrochemical process shortens the reaction time and improves the peeling property.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of MXenes and its derivative nanosheets, and relates to a bottom-up process for preparing MXenes and its derivative nanosheets based on electrochemical stripping, in particular to a process using low-concentration hydrogen fluoride as the A method for preparing nanosheets of MXenes and derivatives thereof from an electrolyte, and applying the prepared nanosheets of MXenes and derivatives thereof to the field of biomimetic enzymes. Background technique: [0002] Two-dimensional materials, defined as crystals with very high aspect ratios and thicknesses equivalent to several atomic layers, have recently attracted considerable international attention. MXenes are an emerging class of two-dimensional (2D) transition metal carbides, nitrides, or carbonitride materials. So far, the most studied MXene is Ti 3 C 2 T x , T represents the surface termination group, such as =O, -OH, -F, x represents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/907C01B32/90G01N21/33C25B1/00B82Y30/00B82Y40/00
CPCG01N21/33C25B1/00B82Y30/00B82Y40/00C01B32/90C01B32/907C01P2004/04
Inventor 许元红方艳峰牛玉生
Owner QINGDAO UNIV
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