High-stability two-dimensional nanomaterial aerogel and preparation method thereof

Abstract

The application discloses a kind of high stability two-dimensional nanometer material aerogel and preparation method thereof, it is related to material science and nanotechnology field.The water solution of two-dimensional nanometer material is frozen and handled to obtain frozen tissue, then foam structure is obtained by freeze drying, after which foam structure is soaked in ionic solution, freeze-dried, to obtain two-dimensional nanometer material aerogel.The application constructs two-dimensional nanometer material foam structure and introduces ionic bond crosslinking mechanism, so that two-dimensional nanometer material is combined by ionic bond to form high stability aerogel, so that aerogel has excellent performance.The application breaks through the selection limit of traditional aerogel material, and is suitable for ceramic two-dimensional material and MXenes with insufficient surface functional groups, lays a foundation for two-dimensional material aerogel large-scale production and application in the field of energy, aerospace and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material science and nanotechnology, in particular to a high-stability two-dimensional nanomaterial aerogel and a preparation method thereof. BACKGROUND

[0002] With the continuous breakthroughs in science and technology and the cross-fusion of multiple disciplines, two-dimensional nanomaterials and aerogels, with their unique physical and chemical properties, are gradually moving from the field of frontier scientific research to the key stage of industrial application, becoming the core force driving the transformation of material science and the development of emerging industries.

[0003] In the field of material science, nanosheets, as a kind of two-dimensional material with a thickness of nanometers and a lateral size of microns or even millimeters, have attracted much attention due to their unique physical and chemical properties and are widely used in energy, electronics, biomedicine and many other fields. The unique advantages of nanosheets are first reflected in their high specific surface area. Due to the nanometer-level thickness, two-dimensional nanomaterials have a very large specific surface area. This means that the material has more surface active sites, which can fully contact other substances, thus exhibiting excellent performance in catalysis, adsorption and other fields. Secondly, nanosheets have outstanding mechanical properties, combining excellent flexibility with relatively high strength. Despite their thinness, they are usually very strong, which not only significantly improves the mechanical properties of composite materials, but also maintains the lightweight of the materials. In addition, the atomic-level thinness of nanosheets also endows them with special properties. This ultra-thin structure of only a few atomic layers or even a single atomic layer produces a unique quantum confinement effect. Under the effect of this effect, the wave functions of electrons and holes are confined within the two-dimensional plane, making the optical and electrical properties of nanosheets significantly different from those of other materials, exhibiting higher photoelectric conversion efficiency and more excellent carrier transport performance.

[0004] Aerogels are also a very distinctive material, which has a nanoporous network structure. This unique structure gives it a variety of advantages. Aerogels have very low density, are one of the lightest solid materials in the world, and are of great value in applications that require weight reduction. Their specific surface area is also very high, usually reaching hundreds or even thousands of square meters per gram. This property endows aerogels with strong adsorption capacity, allowing them to fully contact external substances, which can be used to adsorb various gases, liquids and impurities, and also as high-performance battery electrode materials. The high specific surface area helps to improve the activity and conductivity of the electrode material, thereby enhancing the charge and discharge performance and cycle life of the battery. At the same time, the nanoporous structure inside the aerogel makes it have very low thermal conductivity, with excellent thermal insulation performance, widely used in high-temperature insulation, building insulation, aerospace and other fields.

[0005] If the advantages of two-dimensional materials and aerogels are fully combined, the two-dimensional material aerogels developed will have more unique physical and chemical properties and open up more extensive application scenarios. However, although certain progress has been made in material preparation technology, the preparation of aerogels still faces many complex difficulties. On the one hand, there is a great limitation in material selection. The key to building a three-dimensional network structure of aerogel lies in the chemical activity of the material surface, especially the presence of functional groups. The material forms a whole through the chemical bonding interaction of the surface functional groups, and has an impact on the material structure and mechanical properties, which leads to a large number of materials lacking out-of-plane functional groups that cannot be used to make aerogels. Taking two-dimensional material graphene oxide as an example, a large number of out-of-plane functional groups are generated during the preparation process. Through the chemical bonding of these functional groups, aerogel can be successfully formed. On the other hand, the preparation process of aerogel has very strict requirements for reaction conditions. Any improper control of temperature, pH value, reactant concentration, etc. can easily lead to uneven gel or precipitation. At the same time, there is also the problem of high preparation cost.

[0006] In summary, it is urgent to further develop low-cost and environmentally friendly preparation processes to promote the industrial scale development. How to develop a more universal method to make two-dimensional materials into aerogels, and how to prepare two-dimensional nanosheet aerogels with low cost, mass production and good stability are the main problems currently faced by the field. SUMMARY

[0007] The purpose of the present application is to provide a high-stability two-dimensional nanomaterial aerogel and a preparation method thereof to solve the problems existing in the prior art.

[0008] To achieve the above-mentioned purpose, the present application provides the following solutions.

[0009] The present application provides a preparation method of a two-dimensional nanomaterial aerogel, comprising the following steps:

[0010] (1) freezing a water solution of two-dimensional nanomaterials to obtain a frozen tissue, and freeze-drying the frozen tissue to obtain a foam structure;

[0011] (2) soaking the foam structure in an ionic solution, and then freeze-drying to obtain the two-dimensional nanomaterial aerogel.

[0012] As a further preferred embodiment of the present application, the two-dimensional nanomaterials include titanium dioxide nanosheets, manganese dioxide nanosheets, tantalum oxide nanosheets or MXenes nanosheets.

[0013] As a further preferred embodiment of the present application, the ionic solution comprises a salt solution, a base solution or an acid solution; the salt solution comprises a sodium chloride solution, a potassium chloride solution or a copper nitrate solution; the base solution comprises a lithium hydroxide solution; the acid solution comprises a hydrogen chloride solution.

[0014] As a further preferred embodiment of the present application, the concentration of the ionic solution is 0.5-3 mol / L.

[0015] As a further preferred embodiment of the present application, the soaking time in step (2) is 10-30 min.

[0016] As a further preferred embodiment of the present application, the concentration of the aqueous solution of the two-dimensional nanomaterial is 5-50 mg / mL.

[0017] As a further preferred embodiment of the present application, in step (1), the preparation method of the aqueous solution of the two-dimensional nanomaterial comprises the following steps: mixing the two-dimensional nanomaterial with water, and stirring to obtain the aqueous solution of the two-dimensional nanomaterial; wherein the stirring temperature is 20-40℃.

[0018] As a further preferred embodiment of the present application, the rotation speed during mixing is 300-500 rpm, and the time is 1-3 h.

[0019] The second technical solution of the present application provides the two-dimensional nanomaterial aerogel prepared by the above preparation method.

[0020] In the preparation of aerogels, the chemical activity of the material surface, especially the presence of functional groups, is the key to building a three-dimensional network. For materials such as ceramic two-dimensional materials and MXenes two-dimensional materials that lack surface functional groups, it is difficult to form stable cross-linking structures, and using them as aerogel materials faces unique challenges. This is because the usual ceramic two-dimensional materials and MXenes two-dimensional materials have surface charges, which mainly result from the combined effects of multiple factors such as surface crystal structure defects and environmental interactions. Through the charged properties of nanosheets, the present application introduces corresponding ions to interact with the charged nanosheets, so that the ions in the solution and the loose nanosheets are combined through ionic bonds to form a highly stable two-dimensional nanomaterial aerogel. At the same time, through the electrostatic repulsion of the surface charge of these two-dimensional materials, a stable and uniform nanosheet dispersion liquid is formed during the preparation of the aerogel, which prevents the agglomeration of two-dimensional materials and thus forms a structure-uniform aerogel.

[0021] The two-dimensional nanomaterial is used as a raw material, compared with other aerogel materials, has the advantages of small unit size, large specific surface area, higher surface activity and the like. The two-dimensional nanomaterial aerogel is prepared by dispersing two-dimensional material nanosheets in an aqueous solution, freezing to obtain a frozen tissue, and then performing freeze drying to form a uniform foam structure, and then using a corresponding salt, acid or alkali solution to form a high-stability two-dimensional nanomaterial aerogel through ionic bonding, and the preparation method is simple and convenient.

[0022] The two-dimensional nanomaterial aqueous solution is first frozen to obtain a frozen tissue, which is a prerequisite for subsequent freeze drying, and then the frozen solid tissue is freeze-dried to remove water to obtain a foam structure interwoven by two-dimensional nanosheets. In the freezing process, the water in the solution forms ice crystals, and the nanosheets are pushed into the ice crystal gaps. When freeze-drying is performed, the ice crystals directly sublimate, leaving a pore network interwoven by nanosheets, i.e., a foam structure. If freezing is not performed, direct water removal will cause the nanosheets to collapse or agglomerate, and the foam structure interwoven by the nanosheets cannot be formed.

[0023] In the present application, the nanosheet density and spacing can be accurately controlled by adjusting the solution concentration, volume and other parameters to realize the designability of the aerogel structure.

[0024] The present application has the following technical effects:

[0025] The present application breaks through the limitations of material selection and complex process in traditional aerogel preparation, and provides a simple, efficient and low-cost preparation method. By constructing a two-dimensional nanomaterial foam structure and introducing an ionic bond crosslinking mechanism, a high-stability aerogel is formed by ionic bond combination of two-dimensional nanomaterials.

[0026] The present application combines the high specific surface area, quantum confinement effect and many other characteristics of two-dimensional nanomaterials, as well as the excellent performance and unique application mode of the aerogel structure itself, greatly broadening the application scenarios of two-dimensional nanomaterials and laying a technical foundation for large-scale production in the fields of energy and aerospace. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1SEM images of aerogels obtained from different concentrations of titanium dioxide nanosheet solutions of the present application, Example 2, Example 13 and Example 14; a is a cross-sectional SEM image of the aerogel obtained in Example 13, b is a cross-sectional SEM image of the aerogel obtained in Example 2, c is a cross-sectional SEM image of the aerogel obtained in Example 14, d is a surface SEM image of the aerogel obtained in Example 13, e is a surface SEM image of the aerogel obtained in Example 2, f is a surface SEM image of the aerogel obtained in Example 14.

[0029] Figure 2 SEM images of aerogels of different thicknesses obtained from Example 15, Example 16 and Example 2 of the present application.

[0030] Figure 3 Actual images of the titanium dioxide nanosheet aerogel prepared in Example 2 of the present application.

[0031] Figure 4 SEM images of the aerogels obtained using manganese dioxide nanosheets (a), tantalum oxide nanosheets (b), MXenes nanosheets (c) in Examples 3-5 of the present application.

[0032] Figure 5 Actual images of the foam structure obtained in Example 1 of the present application (TiO2 interwoven structure foam) placed in water and 1M sodium chloride solution, respectively.

[0033] Figure 6 In the figure, (a) is an actual image of the titanium dioxide nanosheet aerogel obtained after treatment with different concentrations of sodium chloride solution in Example 2 and Examples 6-8 of the present application; (b) is a mechanical property test parameter diagram of the titanium dioxide nanosheet aerogel obtained after treatment of the foam structure (labeled as interwoven structure) of the two-dimensional nanomaterials prepared in Example 1 with different concentrations of sodium chloride solution in Example 2, Example 6-8.

[0034] Figure 7 Actual images (a) and mechanical property test parameter diagrams (b) of the aerogels prepared in Example 2 and Examples 9-12 of the present application.

[0035] Figure 8 TGA (a) and DSC (b) performance comparison diagrams of the titanium dioxide nanosheet aerogels obtained in Example 1 (labeled as TiO2) and Example 2 (labeled as TiO2, Na + ) of the present application.

[0036] Figure 9 Schematic diagram of the adsorption of negatively charged nanosheets and cations. DETAILED DESCRIPTION

[0037] The detailed description set forth below of various illustrative embodiments explains the principles of the application and the best mode presently contemplated by the inventors for carrying out the application. It will be understood that the detailed description is merely meant to illustrate certain aspects of the application, and is not intended to limit the scope of the application.

[0038] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Additionally, the use of the term "about" in the detailed description and claims means "approximately" or "in the order of" and is intended to encompass variations that can exist in the values that are recited either explicitly or implicitly by the disclosure. Unless otherwise stated, all ranges include endpoints.

[0039] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice of the present application, the preferred methods and materials are described herein. All documents mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict, the present specification will control.

[0040] Various modifications and changes can be made to the specific embodiments of the application described herein without departing from the scope or spirit of the application. Other embodiments of the application will be apparent to those of ordinary skill in the art from the description and examples presented herein. The description and examples are illustrative of the application and are not intended to limit the scope of the application.

[0041] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or variations thereof, are intended to mean a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, includes, has, or contains a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0042] It should be noted that the present application does not describe the details of the conventional operation of the field, and is not the focus of the present application.

[0043] The titanium dioxide nanosheet in the embodiment of the present application is self-made, and the remaining raw materials are commercially available.

[0044] The preparation steps of the titanium dioxide nanosheet are as follows:

[0045] (1) Synthesis of precursor K 0.8 Ti 1.73 Li 0.27O4: Raw materials were weighed according to the molar ratio of K2CO3, TiO2 and Li2CO3 as 3:13:1 and mixed, the mixture was ground in a mortar for 30 min, and then heated at 900°C in a muffle furnace for 1 h under air environment to decarburize the mixture. The cooled powder was ground for 30 min, and then heated at 1000°C in air for 24 h and cooled to obtain the precursor K 0.8 Ti 1.73 Li 0.27 O4.

[0046] (2) Preparation of titanium dioxide nanosheet: The precursor K 0.8 Ti 1.73 Li 0.27 O4 was dissolved in 1 mol L -1 HCL solution and stirred for 7 days, and the host H 1.07 Ti 1.73 O4 was synthesized by protonation process. Most of the H 1.07 Ti 1.73 O4 was collected by filtration and repeatedly washed with deionized water. Finally, the bulk H 1.07 Ti 1.73 O4 was decomposed by shaking in a tetrabutylammonium hydroxide (TBAOH) solution to obtain Ti 0.87 O2. Then, deionized water was repeatedly washed to remove residual TBAOH, thereby obtaining titanium dioxide nanosheets.

[0047] Example 1

[0048] 1) The titanium dioxide nanosheet was added to water at a concentration of 7.8 mg / ml, and stirred on a magnetic stirrer at a speed of 350 rpm and a heating temperature of 25°C for 1 h to obtain a uniform mixed solution;

[0049] 2) 1 mL of the mixed solution prepared in step 1) was placed in a culture dish with a diameter of 2 cm and a height of 1 cm, and refrigerated (-10°C). After the freezing was completed, freeze-drying was carried out at -41°C to obtain a foam structure of two-dimensional nanomaterials interwoven and stacked.

[0050] Example 2

[0051] 1) The titanium dioxide nanosheet was added to water at a concentration of 7.8 mg / ml, and stirred on a magnetic stirrer at a speed of 350 rpm and a heating temperature of 25°C for 1 h to obtain a uniform mixed solution;

[0052] 2) Take 1 mL of the mixed solution prepared in step 1) and place it in a culture dish with a diameter of 2 cm and a height of 1 cm, and freeze it in a refrigerator (-10°C). After waiting for the freezing to complete, freeze-dry it at -41°C to obtain a two-dimensional nanomaterial interwoven foam structure.

[0053] 3) Immerse the foam structure obtained in step 2) in a 1 mol / L sodium chloride solution for 30 min, and then freeze-dry it again at -41°C to obtain a high-stability two-dimensional nanomaterial aerogel (titanium dioxide nanosheet aerogel) with a thickness of 300 μm.

[0054] Example 3

[0055] The only difference from Example 2 is that in step 1), the titanium dioxide nanosheets are replaced with manganese dioxide nanosheets, and the rest is the same as Example 2.

[0056] Example 4

[0057] The only difference from Example 2 is that in step 1), the titanium dioxide nanosheets are replaced with tantalum oxide nanosheets, and the rest is the same as Example 2.

[0058] Example 5

[0059] The only difference from Example 2 is that in step 1), the titanium dioxide nanosheets are replaced with MXenes nanosheets, and the rest is the same as Example 2.

[0060] Example 6

[0061] The only difference from Example 2 is that in step 3), the concentration of the sodium chloride solution is adjusted to 0.5 mol / L, and the rest is the same as Example 2.

[0062] Example 7

[0063] The only difference from Example 2 is that in step 3), the concentration of the sodium chloride solution is adjusted to 2 mol / L, and the rest is the same as Example 2.

[0064] Example 8

[0065] The only difference from Example 2 is that in step 3), the concentration of the sodium chloride solution is adjusted to 3 mol / L, and the rest is the same as Example 2.

[0066] Example 9

[0067] The only difference from Example 2 is that in step 3), the sodium chloride solution is replaced with a lithium hydroxide solution, and the rest is the same as Example 2.

[0068] Example 10

[0069] The only difference from Example 2 is that in step 3), the sodium chloride solution is replaced with a hydrogen chloride solution, and the rest is the same as Example 2.

[0070] Example 11

[0071] The difference between Example 2 and Example 11 is that in step 3), the sodium chloride solution is adjusted to a potassium chloride solution, and the rest is the same as Example 2.

[0072] Example 12

[0073] The difference between Example 2 and Example 12 is that in step 3), the sodium chloride solution is adjusted to a copper nitrate solution, and the rest is the same as Example 2.

[0074] Example 13

[0075] The difference between Example 2 and Example 13 is that in step 1), the concentration of the titanium dioxide nanosheet solution is adjusted from 7.8 mg / ml to 5 mg / ml, and the rest is the same as Example 2.

[0076] Example 14

[0077] The difference between Example 2 and Example 14 is that in step 3), the concentration of the titanium dioxide nanosheet solution is adjusted from 7.8 mg / ml to 15.6 mg / ml, and the rest is the same as Example 2.

[0078] Example 15

[0079] The difference between Example 2 and Example 15 is that the volume of the titanium dioxide nanosheet solution is adjusted from 1 mL to 0.2 mL, and after adjusting the volume of the solution, a titanium dioxide nanosheet aerogel with a thickness of 60 μm is obtained.

[0080] Example 16

[0081] The difference between Example 2 and Example 16 is that the volume of the titanium dioxide nanosheet solution is adjusted from 1 mL to 0.3 mL, and after adjusting the volume of the solution, a titanium dioxide nanosheet aerogel with a thickness of 100 μm is obtained.

[0082] Figure 1 SEM images of the aerogels obtained from the different concentrations of titanium dioxide nanosheet solutions in Example 2, Example 13, and Example 14; a is a cross-sectional SEM image of the aerogel obtained in Example 13, b is a cross-sectional SEM image of the aerogel obtained in Example 2, c is a cross-sectional SEM image of the aerogel obtained in Example 14, d is a surface SEM image of the aerogel obtained in Example 13, e is a surface SEM image of the aerogel obtained in Example 2, and f is a surface SEM image of the aerogel obtained in Example 14. It can be seen that the aerogel presents a uniform foam-like pore network.

[0083] Figure 2 SEM images of the aerogels obtained from the different thicknesses in Example 15, Example 16, and Example 2.

[0084] Figure 3 Actual photos of the titanium dioxide nanosheet aerogel prepared for Example 2 of the present application.

[0085] Figure 4 SEM photos of the aerogels prepared using manganese dioxide nanosheets (a), tantalum oxide nanosheets (b), and MXenes nanosheets (c) for Examples 3-5 of the present application.

[0086] Figure 5 Actual photos of the foam structure obtained from Example 1 (TiO2 interwoven structure foam) placed in water and 1M sodium chloride solution, respectively.

[0087] Figure 6 In the figure, (a) are actual photos of the titanium dioxide nanosheet aerogels obtained after treatment with sodium chloride solutions of different concentrations in Example 2 and Examples 6-8; (b) are mechanical property test parameter diagrams of the titanium dioxide nanosheet aerogels obtained after treatment of the two-dimensional nanomaterial interwoven and stacked foam structure (labeled as interwoven structure) prepared in Example 1 with sodium chloride solutions of different concentrations in Example 2, Example 6-8. It can be seen that as the NaCl concentration (0.5M-3M) increases, the compressive strength of the aerogel also increases, proving that the ion concentration can optimize the mechanical properties.

[0088] Figure 7 Actual photos (a) and mechanical property test parameter diagrams (b) of the aerogels prepared in Example 2 and Examples 9-12 of the present application.

[0089] Figure 8 TGA (a) and DSC (b) performance diagrams of the nanosheet aerogels obtained from Example 1 (labeled as TiO2) and Example 2 (labeled as TiO2, Na + ) of the present application. It can be seen that the aerogel treated with Na + (TiO2, Na + ) has a lower weight loss rate in thermal gravimetric analysis (TGA), and the differential scanning calorimetry (DSC) curve shows that a smaller amount of exothermic reaction occurs, indicating that ionic crosslinking can improve the thermal stability of the aerogel.

[0090] Figure 9 Schematic diagram of the adsorption and combination of negatively charged nanosheets and cations.

[0091] Mechanical property test:

[0092] Test instrument used: universal tensile testing machine.

[0093] Test process: the two-dimensional nanomaterial interwoven stacked foam structure obtained in example 1 and the aerogel material prepared in examples 2-16 are subjected to mechanical property test, the load bearing curve is recorded by a tensile tester, and the test material is a circle with a radius of 20mm, and the bearing area thereof is calculated as S.

[0094] The load bearing when the structure is deformed is recorded as the maximum load bearing. The load bearing of the material is recorded, the compressive strength of each material is calculated, and the bearing capacity of different structure materials is calculated according to the following formula.

[0095] σc=F / S

[0096] Wherein, F is the load bearing, unit: N; S is the structure bearing area, unit: m 2 ; σc is the compressive strength, unit: Pa.

[0097] Table 1

[0098]

[0099] From examples 1-2 and examples 6-7, it is found that as the concentration of the salt solution increases, the ion combination of the titanium dioxide nanosheet and the salt solution is more sufficient and close, and the mechanical properties of the obtained aerogel are also better.

[0100] From examples 2-5, it is found that the present application is also applicable to a wide variety of ceramic two-dimensional materials and MXenes two-dimensional materials and other materials with insufficient surface functional groups. These two-dimensional materials can be combined with ions through ionic bonds to form stable aerogels.

[0101] From examples 1 and examples 9-12, it is found that the ions of titanium dioxide nanosheets and a wide variety of solutions can be combined through ionic bonds to form stable aerogels.

[0102] From examples 13-14, it is found that the density of the aerogel can be designed and adjusted. The greater the solution density, the greater the aerogel density, the more stable the structure, and the better the mechanical properties obtained by test.

[0103] From examples 15-16, it is found that the thickness of the aerogel can be designed and adjusted, and the use state of the aerogel can be adjusted according to the application scene of the aerogel.

[0104] The above-described examples only describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for preparing a two-dimensional nanomaterial aerogel, characterized in that, The method comprises the following steps: (1) freezing a water solution of two-dimensional nanomaterials to obtain an ice tissue, and freeze-drying the ice tissue to obtain a foam structure; (2) soaking the foam structure in an ionic solution, and then freeze-drying to obtain the two-dimensional nanomaterial aerogel; The two-dimensional nanomaterial is titanium dioxide nanosheet, manganese dioxide nanosheet, tantalum oxide nanosheet or MXenes nanosheet; The ionic solution is a salt solution, an alkali solution or an acid solution; the salt solution is a sodium chloride solution, a potassium chloride solution or a copper nitrate solution; the alkali solution is a lithium hydroxide solution; and the acid solution includes a hydrogen chloride solution; The concentration of the ionic solution is 0.5-3 mol / L; The concentration of the water solution of two-dimensional nanomaterials is 5-50 mg / mL; In step (1), the preparation method of the water solution of two-dimensional nanomaterials comprises the following steps: mixing the two-dimensional nanomaterials with water, and stirring to obtain the water solution of two-dimensional nanomaterials; wherein the stirring temperature is 20-40 ℃.

2. The production method according to claim 1, characterized by, The soaking time in step (2) is 10-30 min.

3. The production method according to claim 1, characterized by, The rotation speed during mixing is 300-500 rpm, and the time is 1-3 h.

4. The two-dimensional nanomaterial aerogel prepared by the preparation method according to any one of claims 1-3.

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