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A method for electrochemically preparing nanosheets of mxenes and their derivatives

A technology of derivatives and nanosheets, applied in the direction of chemical instruments and methods, nanotechnology for materials and surface science, carbides, etc., can solve problems such as long etching time, environmental pollution, and health hazards, and achieve improved peeling, The effect of shortening the reaction time and reducing the production cost

Active Publication Date: 2022-08-05
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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  • A method for electrochemically preparing nanosheets of mxenes and their derivatives
  • A method for electrochemically preparing nanosheets of mxenes and their derivatives
  • A method for electrochemically preparing nanosheets of mxenes and their derivatives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

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

Embodiment 2

[0024] This example compares the Ti prepared in Example 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 652 nm was tested as a function of time, such as image 3 As shown, in the system containing 3,3',5,5'-tetramethylbenzidine, hydrogen peroxide and nanosheets, the reaction solution gradually turned blue, proving that the nanosheets have peroxidase activity .

Embodiment 3

[0026] This example compares the Ti prepared in Example 1 3 C 2 T x MXene and its derivative nanosheets eliminate superoxide radicals, such as Figure 4 As shown in A, when nanosheets were added to the mixed solution containing riboflavin, methionine and nitrotetrazolium blue, the UV absorbance at 560 nm decreased under the condition of light irradiation, indicating that it eliminated the ultra-violet light. Oxygen free radicals; such as Figure 4 As shown in B, as the concentration of nanosheets increases, the UV absorbance at 560 nm gradually decreases, indicating that the content of eliminating superoxide radicals increases gradually, proving that the nanosheets have superoxide dismutase activity.

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Abstract

The invention belongs to the technical field of preparation of MXenes and their derivatives nanosheets, and relates to a method for electrochemically preparing MXenes and their derivatives nanosheets. Put the sodium bifluoride powder into 50mL beakers respectively, add 50mL deionized water to the beaker containing the powder, put it on a magnetic stirrer to completely dissolve the ammonium bifluoride powder; 3 AlC 2 MAX is fixed to the clip electrode as anode, Pt sheet electrode (area > 1.0cm 2 ) as a negative electrode, and apply the direct current constant voltage of 3V, react 6-24 hours; At last centrifugation makes the product, the present invention is compared with the prior art, in the preparation process, the use of low-concentration ammonium bifluoride has avoided high-concentration hydrofluoric acid Or the mixture of hydrochloric acid and fluoride, which is non-toxic and low in hazard, eliminates the potentially dangerous process and is green and environmentally friendly; the electrolysis of the bulk MAX process by electrochemical methods shortens the reaction time and improves the peeling.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of MXenes and their derivatives nanosheets, and relates to a bottom-up process for preparing MXenes and their derivatives nanosheets based on electrochemical stripping, in particular to a low-concentration hydrogen fluoride as A method for preparing MXenes and their derivatives nanosheets from electrolyte, and applying the prepared MXenes and their derivatives nanosheets 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. By 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 the number of surface termi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/90G01N21/33C25B1/01B82Y30/00B82Y40/00
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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