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Universal method for enhancing stability of MXene aqueous solution

A general method and technology of aqueous solution, applied in the field of materials, can solve the problems of limited production and processing, long-term storage and transportation and practical application, destruction of physical and chemical properties, collapse of two-dimensional structure, etc., to achieve suitable for large-scale applications, reduce process complexity and cost, the effect of enhancing stability

Active Publication Date: 2022-02-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The two-dimensional nanostructure of MXene endows it with unique properties, but the etching synthesis of MXene exposes a large number of metastable metal atoms and highly reactive defect sites on the surface, making it very easy to oxidize and deteriorate in aqueous solution, resulting in its The two-dimensional structure collapses and the physical and chemical properties are destroyed, which greatly limits its production, processing, long-term storage, transportation and practical application

Method used

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  • Universal method for enhancing stability of MXene aqueous solution
  • Universal method for enhancing stability of MXene aqueous solution
  • Universal method for enhancing stability of MXene aqueous solution

Examples

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Effect test

Embodiment 1

[0025] 1) Dissolve NaCl evenly in 200mL Ti 3 C 2 MXene aqueous solution, wherein the NaCl concentration is 3M, the Ti used 3 C 2 The concentration of MXene aqueous solution is 15g L –1 .

[0026] 2) Place the above-mentioned MXene aqueous solution containing inorganic salts at room temperature to form a long-term stable MXene aqueous solution, wherein the water activity is 0.92, and the dissolved oxygen concentration is 3.67mg L -1 .

[0027] 3) After filtering and washing to remove NaCl, pure Ti can be obtained 3 C 2 MXene.

[0028] 4) Evaporation and crystallization of NaCl from which MXene has been filtered out at 55°C can realize the recovery of NaCl.

[0029] Such as figure 1 As shown, after storage for 30 days under the above conditions, Ti 3 C 2 MXene still maintains its two-dimensional structure, proving its good protective effect.

Embodiment 2

[0031] 1) Dissolve NaCl evenly in 200mL Ti 3 C 2 In the MXene aqueous solution, where the NaCl concentration is 5.5M, the Ti used 3 C 2 The concentration of MXene aqueous solution is 1g L –1 .

[0032] 2) Place the above-mentioned MXene aqueous solution containing inorganic salts at room temperature to form a long-term stable MXene aqueous solution, in which the water activity is 0.76 and the dissolved oxygen concentration is 1.95mg L -1

[0033] 3) After filtering and washing to remove NaCl, pure Ti can be obtained 3 C 2 MXene.

[0034] 4) Evaporation and crystallization of NaCl from which MXene has been filtered out at 55°C can realize the recovery of NaCl.

[0035] Such as figure 2 As shown, after storage for 30 days under the above conditions, Ti 3 C 2 The X-ray diffraction pattern of MXene did not change significantly, proving that its crystal structure was well maintained.

Embodiment 3

[0037] 1) will K 2 SO 4 Uniformly dissolved in 200mL Ti 3 C 2 MXene aqueous solution, where K 2 SO 4 The concentration is 0.6M, the Ti used 3 C 2 The concentration of MXene aqueous solution is 10g L –1 .

[0038] 2) Put the above-mentioned MXene aqueous solution containing inorganic salts at room temperature to form a long-term stable MXene aqueous solution, in which the water activity is 0.96.

[0039] 3) After filtering and washing to remove K 2 SO 4 , to obtain pure Ti 3 C 2 MXene.

[0040] 4) will filter out the K of MXene 2 SO 4 The solution evaporates and crystallizes at 55°C, and K 2 SO 4 recycling.

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Abstract

The invention provides a universal method for enhancing the stability of an MXene aqueous solution, and belongs to the field of materials. An inorganic salt which is cheap and easy to obtain is used for synchronously reducing the proportion of free water molecules and the concentration of dissolved oxygen in water, the stability of MXene in an aqueous solution is improved, and the storage time of the MXene aqueous solution is remarkably prolonged. A used inorganic salt protective agent can be efficiently recovered through a simple and feasible evaporative crystallization method. According to the method provided by the invention, the MXene aqueous solution can be stably stored for 400 days at most, and the basic problems troubling production and processing, long-term storage and transportation and practical application of MXene are solved. The synthesis method is green, environment-friendly, low in energy consumption and easy to control, has universality and can be used for large-scale production.

Description

technical field [0001] The invention belongs to the field of materials and relates to a general method for enhancing the stability of MXene aqueous solution. Background technique [0002] MXene is a new two-dimensional crystal of transition metal carbide or nitride obtained by acid etching the MAX phase of layered ceramic materials. Its chemical formula is M n+1 x n T x , where M n+1 x n Represents its transition metal carbonitride structure skeleton (M is a transition metal element, X is carbon or nitrogen, n=1, 2 or 3), T x Indicates its surface chemical functional groups (such as -OH, -F, -O, etc.). Such materials have a two-dimensional structure similar to graphene, as well as excellent electrical, mechanical, magnetic and other properties. In recent years, it has been widely used in a wide range of fields such as energy storage, catalysis, electromagnetic shielding, water treatment, gas / biological sensing, biomedicine, and optoelectronic devices, and is regarded ...

Claims

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Application Information

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IPC IPC(8): B01F23/50B01F21/00
CPCY02W10/37
Inventor 王治宇王星宇邱介山
Owner DALIAN UNIV OF TECH
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