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Method for preparing two-dimensional nanosheet crystal Ti3C2 alkene

A two-dimensional nano and lamella technology, applied in the direction of carbide, titanium carbide, etc., can solve the problems of long reaction time, time and energy consumption, and low efficiency, and achieve the goal of improving reaction efficiency, shortening corrosion time, and improving production efficiency Effect

Inactive Publication Date: 2017-05-31
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above method is characterized by the need for finer raw material powder, longer reaction time, time and energy consumption, and low efficiency. Therefore, the efficient preparation of low-cost MXene in a short time is of great significance for promoting the industrial production and practical application of MXene.

Method used

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  • Method for preparing two-dimensional nanosheet crystal Ti3C2 alkene
  • Method for preparing two-dimensional nanosheet crystal Ti3C2 alkene
  • Method for preparing two-dimensional nanosheet crystal Ti3C2 alkene

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Effect test

Embodiment 1

[0036] A two-dimensional nanosheet Ti 3 C 2 The preparation method of alkenes, comprises the steps:

[0037] 1) High-purity Ti 3 AlC 2 The block is mechanically crushed and ground and passed through a 200-mesh sieve to obtain Ti with a particle size of less than 75 μm 3 AlC 2 raw material powder;

[0038] 2) Add 2g of Ti 3 AlC 2The raw material powder and 60 mL of HF acid with a mass fraction of 35% were added to a tetrafluoroethylene beaker and sealed, then magnetically stirred, and heated to 50°C in a water bath, and the magnetic stirring reaction was continued at 50°C for 0.5h; get a liquid mixture;

[0039] 3) The liquid mixture is centrifuged several times with a centrifuge with a rotating speed of 4000rpm, and after each centrifugation, the sediment and water are mixed and ultrasonicated for 3-5min, and after centrifugation until the pH value of the supernatant is 5-7, Then wash twice with absolute ethanol to obtain the crude product.

[0040] 4) Dry the crude ...

Embodiment 2

[0044] A two-dimensional nanosheet Ti 3 C 2 The preparation method of alkenes, comprises the steps:

[0045] 1) High-purity Ti 3 AlC 2 The block is mechanically crushed and ground and passed through a 200-mesh sieve to obtain Ti with a particle size of less than 75 μm. 3 AlC 2 raw material powder;

[0046] 2) Add 0.5g of Ti 3 AlC 2 The raw material powder and 60mL of HF acid with a mass fraction of 30% were added to a tetrafluoroethylene beaker and sealed, then magnetically stirred, and heated to 40°C in a water bath, and the magnetic stirring reaction was continued at 40°C for 2h; liquid mixture;

[0047] 3) The liquid mixture is centrifuged several times with a centrifuge with a rotating speed of 4000rpm, and after each centrifugation, the sediment and water are mixed and ultrasonicated for 3-5min, and after centrifugation until the pH value of the supernatant is 5-7, Then wash twice with absolute ethanol to obtain the crude product.

[0048] 4) Dry the crude produ...

Embodiment 3

[0052] A two-dimensional nanosheet Ti 3 C 2 The preparation method of alkenes, comprises the steps:

[0053] 1) High-purity Ti 3 AlC 2 The block is mechanically crushed and ground and passed through a 200-mesh sieve to obtain Ti with a particle size of less than 75 μm. 3 AlC 2 raw material powder;

[0054] 2) Add 2.5g of Ti 3 AlC 2 The raw material powder and 60mL of HF acid with a mass fraction of 30% were added to a tetrafluoroethylene beaker and sealed, then magnetically stirred, and heated to 50°C in a water bath, and the magnetic stirring reaction was continued for 1h under the condition of 50°C; liquid mixture;

[0055] 3) The liquid mixture is centrifuged several times with a centrifuge with a rotating speed of 4000rpm, and after each centrifugation, the sediment and water are mixed and ultrasonicated for 3-5min, and after centrifugation until the pH value of the supernatant is 5-7, Then wash twice with absolute ethanol to obtain the crude product.

[0056] 4)...

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Abstract

The invention discloses a method for preparing two-dimensional nanosheet crystal Ti3C2 alkene. The method specifically comprises the following steps: performing mechanical crushing and grinding on a high-purity Ti3AlC2 block, and screening by using a sieve of 200 meshes so as to obtain Ti3AlC2 raw material powder of which the particle size is smaller than 75[mu] m; mixing the Ti3AlC2 raw material powder and 10-40wt% HF (Hydrogen Fluoride) acid, sealing, stirring, heating to 25-60 DEG C, and further stirring to react for 0.5-10 hours at 25-60 DEG C so as to obtain a liquid mixture; performing multiple times of centrifugal treatment on the liquid mixture till the pH value of supernate obtained after centrifugal treatment is 5-7 so as to obtain a crude product; performing vacuum drying on the crude product, thereby obtaining the two-dimensional nanosheet crystal Ti3C2 alkene. Compared with other documents and patents, the method aims to prepare raw material powder with low-concentration acid corrosion and a relatively wide particle size range from the Ti3AlC2 raw material powder of which the particle size is smaller than 75[mu] m by using a low-concentration acid solution in modes of continuous stirring and heating heat preservation, not only is the particle size range of the raw material powder increased, but also the corrosion time is greatly shortened, and great significances for promoting industrial production and actual application of MXene can be achieved.

Description

technical field [0001] The invention relates to the field of preparation of two-dimensional nanomaterials, and more specifically, relates to a short-time and efficient method for preparing two-dimensional nano-sheet crystal MXene. Background technique [0002] Graphene is a well-known typical two-dimensional material. Because it is only composed of one layer of C atoms, it has unique electrical, mechanical, thermal and other excellent properties. In recent years, another new type of "graphene-like" two-dimensional material - MXene has been discovered. MXene is composed of ternary carbides and nitrides with a hexagonal structure (the general formula is M n+1 AX n , abbreviated as MAX, M is a transition metal element, A is the third and fourth main group elements, X is C or N, n=1,2,3) M is selectively etched by acid n+1 AX n After the "A" atomic layer in the M n+1 x n . When n=1,2,3, the corresponding M 2 X, M 3 x 2 and M 4 x 3 Nanoplatelets composed of 3, 5 and 7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921
CPCC01P2002/72C01P2004/03C01P2004/61
Inventor 李世波胡树郡李浩林周洋李翠伟黄振莺翟洪祥
Owner BEIJING JIAOTONG UNIV
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