Two-dimensional clay mineral nanosheet and rapid mass preparation method thereof

Abstract

The invention relates to the technical field of two-dimensional material preparation, in particular to a two-dimensional clay mineral nanosheet and a rapid and large-scale preparation method thereof.The rapid and large-scale preparation method of the two-dimensional clay mineral nanosheet comprises the steps that clay mineral powder and a solvent are mixed and treated through a sand mill, and a sand-milled thinned clay mineral solution is obtained; pretreating the sand-milled and thinned clay mineral solution by using a micro-jet homogenizer to obtain a pretreated clay mineral solution; and carrying out microjet homogenization treatment on the pretreated clay mineral solution, and drying to obtain the two-dimensional clay mineral nanosheet. According to the method, clay minerals are stripped by high shear force generated by a micro-jet homogenization principle in the sand-milled and thinned clay mineral solution subjected to sand milling treatment, so that the high-quality two-dimensional clay mineral nanosheet can be obtained. The preparation method has the advantages of high yield, high speed and few defects, and can be used for preparing the high-quality thin-layer clay mineral nanosheet with micron-grade transverse size and several-nanometer thickness.

Description

Technical Field

[0001] The present invention relates to the technical field of two-dimensional material preparation, and in particular to a two-dimensional clay mineral nanosheet and a method for rapidly and massively preparing the same. Background Art

[0002] With the rise of the field of two-dimensional materials, a variety of layered materials have been exfoliated and synthesized, such as graphene, hexagonal boron nitride, transition metal disulfides, black phosphorus, MXenes, montmorillonite, vermiculite, etc. Most clay minerals are layered silicates with natural layered structures and have the potential to be exfoliated into two-dimensional nanosheets through "top-down" exfoliation. At the same time, clay minerals are rich in variety, unique in physical properties, and low in cost. After exfoliation into ultra-thin nanosheets, they have more excellent mechanical, optical, and electrical properties, as well as new physical and chemical properties that clay mineral raw materials do not have.

[0003] There are many types of clay minerals, and most of them have successfully achieved the exfoliation preparation of clay mineral nanosheets (CNs) with atomic-level thickness. A common method is to use the exchangeability of interlayer ions in clay minerals themselves, change the lattice structure of clay minerals by exchanging cations, and then combine external forces such as ultrasound, mechanical shearing, and ball milling to achieve the preparation of a small amount of clay mineral nanosheets. Taking vermiculite as an example, vermiculite can be ion-exchanged with saturated sodium chloride solution and 2M lithium chloride solution respectively to achieve the change of vermiculite lattice, and then after a period of ultrasonic treatment, vermiculite nanosheets can be exfoliated. However, the preparation of most CNs is currently limited to small-scale preparation in the laboratory, and there are defects such as poor universality of the preparation method, long preparation cycle, low quality of nanosheets, and forced modification of nanosheets.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a two-dimensional clay mineral nanosheet and a method for rapid and large-scale preparation thereof, aiming to solve the problem that the preparation of existing two-dimensional nanosheets is limited to a small scale, a long cycle, and cannot be prepared in large quantities.

[0006] The technical solution of the present invention is as follows:

[0007] A method for rapidly preparing a large number of two-dimensional clay mineral nanosheets comprises the following steps:

[0008] The clay mineral powder is mixed with a solvent, and subjected to sand milling to obtain a sand milled and thinned clay mineral solution;

[0009] Pre-treating the sand-milled and thinned clay mineral solution using a microfluidizer to obtain a pre-treated clay mineral solution;

[0010] The pretreated clay mineral solution is subjected to microfluidization homogenization treatment and dried to obtain two-dimensional clay mineral nanosheets.

[0011] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets, wherein the clay mineral powder comprises one or more of muscovite, phlogopite, biotite, vermiculite, chlorite, rectorite, talc, dickite, and montmorillonite.

[0012] In the method for rapidly and massively preparing two-dimensional clay mineral nanosheets, the solvent is a mixture of one or more of water and anhydrous ethanol.

[0013] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets comprises the following steps: the clay mineral powder is passed through a sieve with a mesh size of 20 or more and then mixed with the solvent; and the particle size of the sand-thinned clay mineral in the sand-thinned clay mineral solution is below 75 μm.

[0014] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets comprises the following steps: the rotation speed of the sand milling treatment is 2000 rpm-3000 rpm, and the time of the sand milling treatment is 5 min-30 min.

[0015] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets, wherein the sand grinding process uses zirconium oxide balls with a diameter of 0.6 mm to 0.8 mm.

[0016] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets, wherein the number of pretreatments is 1-5 and the pretreatment pressure is 400 bar-800 bar.

[0017] The method for rapidly and massively preparing two-dimensional clay mineral nanosheets, wherein the time of the microfluidic homogenization treatment is 5 min-30 min, and the pressure of the microfluidic homogenization treatment is 800 bar-1500 bar.

[0018] A two-dimensional clay mineral nanosheet is prepared by using a rapid and large-scale preparation method of two-dimensional clay mineral nanosheets.

[0019] The two-dimensional clay mineral nanosheet has a lateral size between 500nm and 2μm.

[0020] Beneficial effects: The present invention provides a two-dimensional clay mineral nanosheet and a rapid and large-scale preparation method thereof. The rapid and large-scale preparation method of the two-dimensional clay mineral nanosheet comprises the steps of: mixing clay mineral powder with a solvent, treating it with a sand mill, obtaining a sand-milled and thinned clay mineral solution; pre-treating the sand-milled and thinned clay mineral solution with a micro-jet homogenizer, obtaining a pre-treated clay mineral solution; subjecting the pre-treated clay mineral solution to micro-jet homogenization, and drying to obtain a two-dimensional clay mineral nanosheet. The present invention disperses clay mineral powder in a solvent and performs sand milling treatment to reduce the particle size of the raw material, and uses the high shear force generated by the micro-jet homogenization principle to peel off the clay mineral in the sand-milled and thinned clay mineral solution after sand milling, so as to obtain high-quality two-dimensional clay mineral nanosheets. In addition, the preparation method has the advantages of being fast, efficient and environmentally friendly. The preparation method for preparing two-dimensional clay mineral nanosheets has high yield (over 70%), fast speed (gram level per hour), and few defects, and can prepare high-quality thin-layer clay mineral nanosheets with micron-level lateral dimensions and several nanometers thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a process flow of a method for rapidly and massively preparing two-dimensional clay mineral nanosheets according to the present invention;

[0022] Figure 2 The scanning electron microscope image and the transmission electron microscope image of the talc nanosheet powder in Example 1;

[0023] Figure 3 The scanning electron microscope image and the transmission electron microscope image of the muscovite nanosheet powder in Example 2;

[0024] Figure 4 The scanning electron microscope image and the transmission electron microscope image of the phlogopite nanosheet in Comparative Example 1 are shown;

[0025] Figure 5 These are the scanning electron microscope images and transmission electron microscope images of the muscovite nanosheets in Comparative Example 2. DETAILED DESCRIPTION

[0026] The present invention provides a two-dimensional clay mineral nanosheet and a method for rapidly preparing the same in large quantities. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0028] like Figure 1 As shown, the present invention provides a method for rapidly and massively preparing two-dimensional clay mineral nanosheets, comprising the steps of:

[0029] Step S10: mixing the clay mineral powder with the solvent, and subjecting the mixture to sand milling to obtain a sand milled and thinned clay mineral solution;

[0030] Step S20: pre-treating the sand-milled and thinned clay mineral solution using a microfluidizer to obtain a pre-treated clay mineral solution;

[0031] Step S30: subjecting the pretreated clay mineral solution to microfluidization homogenization treatment and drying to obtain two-dimensional clay mineral nanosheets.

[0032] In this embodiment, clay mineral powder is dispersed in a solvent and sand-milled to reduce the particle size of the raw material, and the sand-milled thinned clay mineral solution after sand-milling is subjected to high shear force generated by the micro-jet homogenization principle to peel off the clay mineral, thereby obtaining high-quality two-dimensional clay mineral nanosheets. In addition, the preparation method has the advantages of being fast, efficient and environmentally friendly. The preparation method for preparing two-dimensional clay mineral nanosheets has high yield (over 70%), fast speed (gram level per hour), and few defects, and can prepare high-quality thin-layer clay mineral nanosheets with micron-level lateral dimensions and several nanometers thickness.

[0033] Specifically, the method for rapidly preparing two-dimensional clay mineral nanosheets provided by the present invention has the following advantages compared with the existing clay mineral exfoliation technology:

[0034] 1) The method for rapid and large-scale preparation of two-dimensional clay mineral nanosheets of the present invention is universal and can quickly and efficiently realize the exfoliation preparation of various clay mineral nanosheets within 1 hour, with a yield of 50%-80% and a preparation rate of 0.6g / h-6g / h.

[0035] 2) The stripping solvent used in the preparation method of the present invention has less pollution and can be recycled, and is environmentally friendly; at the same time, the preparation method is limited only by the processing rate of microfluidization homogenization and the number of homogenization chambers. Through instrument improvement, it has the potential for larger-scale and industrialized preparation.

[0036] 3) The preparation method can be used to prepare thin-layer clay mineral nanosheets with lateral dimensions ranging from hundreds of nanometers to micrometers and a thickness of several nanometers. The prepared nanosheets have fewer defects and no surface pollution. They can be further processed by modification and other methods, and have strong scalability.

[0037] 4) The preparation method is easy to operate, has few steps and good safety. The first step of sand grinding and thinning can ensure that the particle size of the clay mineral after treatment meets the requirements of microjet homogenization. The low-pressure pretreatment ensures that the instrument will not be blocked during microjet high-pressure homogenization, thereby improving the safety of the preparation of clay mineral nanosheets.

[0038] In some embodiments, in step S10, the sand-milled and thinned clay mineral solution object can be spray-dried or filtered, and the filter residue can be dried to obtain sand-milled and thinned clay mineral powder; that is, after the sand-milling treatment, the clay mineral powder can be directly stored in a liquid phase, or stored as a solid phase sand-milled and thinned clay mineral powder.

[0039] In some embodiments, in step S20, if the solid-phase sand-milled thinned clay mineral powder is preserved in step S10, then in step S20, the solid-phase sand-milled thinned clay mineral powder needs to be first dispersed in a solvent to obtain a uniformly dispersed sand-milled thinned clay mineral solution before pretreatment.

[0040] In some embodiments, the clay mineral powder includes but is not limited to one or more layered silicate mineral powders of muscovite, phlogopite, biotite, vermiculite, chlorite, rectorite, talc, dickite, and montmorillonite; the above-mentioned clay mineral powder is suitable for the above-mentioned preparation method, and high-quality two-dimensional clay mineral nanosheets can be prepared by the above-mentioned preparation method.

[0041] In some embodiments, the solvent is a mixture of one or more of water and anhydrous ethanol. The use of the above solvents to prepare two-dimensional clay mineral nanosheets can reduce environmental pollution, can be recycled, and has environmentally friendly characteristics.

[0042] Specifically, the solvent can be prepared by using anhydrous ethanol and deionized water to obtain an ethanol solution with any mass fraction for the preparation of two-dimensional clay mineral nanosheets. For example, the solvent can be, but is not limited to, 50% ethanol.

[0043] In some embodiments, the clay mineral powder is passed through a sieve with a mesh size of 20 or more before being mixed with the solvent; the particle size of the sand-milled and thinned clay mineral in the sand-milled and thinned clay mineral solution is below 75 μm. Before the sand-milling process, the clay mineral powder raw material is first passed through a sieve with a mesh size of 20 or more to achieve a rough screening of the raw material, ensuring that the sand-milling process can obtain the sand-milled and thinned clay mineral with a particle size of below 75 μm.

[0044] In some embodiments, in the step S30, after the pretreated clay mineral solution is subjected to microfluidization homogenization treatment, drying treatment may not be performed, so that the two-dimensional clay mineral nanosheets are stored in the form of a solution.

[0045] In some embodiments, the rotation speed of the sand grinding treatment is 2000 rpm-3000 rpm, and the time of the sand grinding treatment is 5 min-30 min.

[0046] In some embodiments, the sanding process uses zirconia balls with a diameter of 0.6 mm to 0.8 mm.

[0047] Specifically, the sand milling process uses a sand mill, the abrasive used in the sand milling is a zirconium oxide ball with a diameter between 0.6 mm and 0.8 mm, the concentration of the clay mineral dispersion obtained by mixing the clay mineral powder with the solvent is 80 g / L-150 g / L, the processing conditions are 2000 rpm-3000 rpm, the processing volume is 1 L-5 L, and the processing time is 5 min-30 min. After the sand milling process, a sand milled thinned clay mineral with a particle size of less than 75 μm can be obtained.

[0048] In some embodiments, the number of pretreatments is 1-5, and the pressure of the pretreatments is 400 bar-800 bar.

[0049] Specifically, the instrument used for the pretreatment is a microfluidizer, the processing capacity is 0.5g-2.5g of sand-milled thinned clay mineral, 250ml of sand-milled thinned clay mineral solution is processed, and the processing conditions are 1-5 rounds of pretreatment and 400bar-800bar pressure.

[0050] In some embodiments, the time of the microfluidic homogenization treatment is 5 min-30 min, and the pressure of the microfluidic homogenization treatment is 800 bar-1500 bar.

[0051] Specifically, the present invention adopts a method of coordinating sand milling + pretreatment + micro-jet homogenization to sequentially process clay mineral powder, and utilizes the high shear force generated by the micro-jet homogenization principle to peel off the clay mineral, thereby realizing rapid and large-scale preparation of two-dimensional clay mineral nanosheets, and the obtained two-dimensional clay mineral nanosheets have micron-level lateral dimensions and several nanometers thickness.

[0052] In addition, the present invention also provides a two-dimensional clay mineral nanosheet, which is prepared by a rapid and large-scale preparation method of the two-dimensional clay mineral nanosheet.

[0053] In this embodiment, the preparation method can obtain high-quality two-dimensional clay mineral nanosheets by exfoliating the clay mineral using the high shear force generated by the micro-jet homogenization principle from the sand-milled thinned clay mineral solution. In addition, the preparation method for preparing two-dimensional clay mineral nanosheets has high yield (over 70%), fast speed (gram level per hour), and few defects, and can prepare high-quality thin-layer clay mineral nanosheets with micron-level lateral dimensions and several nanometers thickness.

[0054] In some embodiments, the lateral size of the two-dimensional clay mineral nanosheet is between 500nm and 2μm. Two-dimensional clay mineral nanosheets with lateral sizes between 500nm and 2μm can be applied in many fields, and have good product performance.

[0055] The following examples are further given to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention.

[0056] Example 1

[0057] This embodiment provides a method for rapidly preparing a large number of two-dimensional talc nanosheets, comprising the following steps:

[0058] Step 1: talc is dispersed in deionized water at 100 g / L, 2.5 L of clay mineral solution is processed by a sand mill at 2500 rpm for 5 min, and then the talc solution is spray-dried to obtain sand-milled and thinned talc powder;

[0059] Step 2: Disperse 1 g of sand-thinned talc in 250 ml of 50% ethanol solution, stir and disperse evenly, and then use a microfluidizer to perform two rounds of pretreatment at 600 bar to obtain a pretreated talc solution;

[0060] Step 3: 250 ml of the pretreated talc solution is subjected to microfluidization homogenization at 800 bar for 10 min to obtain a talc nanosheet solution, and a filter residue is obtained by suction filtration, and the talc nanosheet powder is obtained after drying;

[0061] The talc nanosheet powder prepared in this example was characterized, and its scanning electron microscope and transmission electron microscope images are shown in FIG. Figure 2As shown, a in the figure is a scanning electron microscope photo of the talc nanosheet powder of this embodiment, and b is a transmission electron microscope photo of the talc nanosheet powder. It can be observed from the scanning and transmission electron microscope photos that the talc is successfully peeled off to prepare talc nanosheets, whose lateral size is 500nm~1.5um, showing thin layer characteristics, and the final yield is 72%. In this embodiment, the sand milling thinning process takes a short time and a large processing amount, which has little effect on the preparation rate of the talc nanosheets, so only the preparation rate of the talc nanosheets obtained in the homogenization step needs to be considered. After calculation, the preparation rate of the talc nanosheets can reach 4.32g / h.

[0062] Example 2

[0063] This embodiment provides a method for rapidly preparing a large number of two-dimensional muscovite mica nanosheets, comprising the following steps:

[0064] Step 1: Disperse muscovite powder in deionized water at 100 g / L, process 2 L of clay mineral solution at 3000 rpm using a sand mill for 20 min, and then spray dry the muscovite solution to obtain sand-milled and thinned muscovite powder;

[0065] Step 2: Disperse 0.5 g of sand-milled muscovite powder in 250 ml of deionized water, stir and disperse evenly, and then use a microfluidizer to perform two rounds of pretreatment at 800 bar to obtain a pretreated muscovite solution;

[0066] Step 3: 250 ml of the pretreated muscovite solution is subjected to microfluidization homogenization at 1200 bar for 15 min to obtain a muscovite nanosheet solution, and a filter residue is obtained by suction filtration, and the muscovite nanosheet powder is obtained after drying;

[0067] The white mica nanosheet powder prepared in this example was characterized, and its scanning electron microscope and transmission electron microscope images are shown in FIG. Figure 3 As shown, a in the figure is a scanning electron microscope photograph of the muscovite nanosheet powder of this embodiment, and b is a transmission electron microscope photograph of the muscovite nanosheet powder. It can be observed from the scanning and transmission electron microscope photographs that the muscovite is successfully peeled off to prepare muscovite nanosheets with a lateral size of 700nm to 2um and showing thin-layer nanosheet characteristics. The final yield is 55% and the preparation rate can reach 1.1g / h.

[0068] Comparative Example 1

[0069] This comparative example provides an intercalation and exfoliation method of phlogopite nanosheets, comprising the following steps:

[0070] Step 1: heating the phlogopite powder to 800°C in a resistance furnace at a heating rate of 5°C / min and then keeping the temperature for 1 hour to obtain calcined phlogopite powder;

[0071] Step 2: 4.5 g of calcined phlogopite powder is placed in a reaction container, and then 500 mL of 5 mol / L nitric acid is added, reacting at 80° C. for 5 hours, and then filtering to obtain a filter residue, washing the filter residue to neutrality, and then drying to obtain acid-washed phlogopite powder;

[0072] Step 3: 4.5 g of acid-washed mica powder was added to a reaction container, and then 150 mL of saturated sodium chloride solution was added, and the mixture was reacted at 95° C. for 3 hours, and then filtered to obtain a filter residue, which was washed until there was no chloride ion, and then dried to obtain salt-washed phlogopite powder;

[0073] Step 4: 1.5 g of salt-washed mica powder is added into a reaction vessel, and then 150 mL of deionized water and 4.6 g of hexadecyltrimethylammonium bromide are added, and the mixture is reacted at 80° C. for 24 hours, and then filtered to obtain a filter residue, which is washed until there is no chloride ion, and then dried to obtain intercalated phlogopite powder;

[0074] Step 5: 20 g of intercalated mica powder was dispersed in 500 mL of anhydrous ethanol, and then ultrasonically exfoliated for 0.5 h using an ultrasonic crusher. The upper suspension was collected by centrifugation at 3000 r / min for 10 min, and the remaining sample was redispersed in an equal volume of anhydrous ethanol and ultrasonically exfoliated until no suspension was produced after centrifugation. After drying, phlogopite nanosheets were obtained.

[0075] The phlogopite nanosheets prepared in this comparative example were characterized, and the scanning electron microscope and transmission electron microscope images thereof are shown in FIG. Figure 4 As shown, a in the figure is a scanning electron microscope photo of the phlogopite nanosheets of this comparative example, and b is a transmission electron microscope photo of the phlogopite nanosheets. Through scanning and transmission electron microscopy, it can be seen that the lateral size of the phlogopite nanosheets is about 1 μm, and it shows thin layer characteristics, indicating the success of the phlogopite peeling. However, it can be clearly observed that the surface of the phlogopite nanosheets is severely etched, with many defects, and the final yield of the phlogopite nanosheets is low, less than 30%. At the same time, the preparation steps of this comparative example are cumbersome, and long-term ultrasonic treatment is required during the preparation, which is not conducive to large-scale preparation. This preparation method is suitable for the peeling preparation of sericite nanosheets, but it is difficult to apply to phlogopite with poor acid resistance, indicating the defect of insufficient universality of this method.

[0076] Comparative Example 2

[0077] This comparative example provides a method for preparing a large amount of muscovite nanosheets by sand milling, comprising the following steps:

[0078] Disperse muscovite powder in deionized water at 100 g / L, process 2 L of muscovite solution at 3000 rpm using a sand mill for 2 h, and then spray dry the muscovite solution to obtain sand-milled exfoliated muscovite nanosheets;

[0079] The white mica nanosheets prepared in this comparative example were characterized, and the scanning electron microscope and transmission electron microscope images thereof are shown in FIG. Figure 5 As shown, a in the figure is a scanning electron microscope photo of the white mica nanosheet of this comparative example, and b is a transmission electron microscope photo. Through the scanning and transmission electron microscope photos, it can be seen that the white mica nanosheet is successfully prepared, the lateral size is less than 300nm, and it shows the characteristics of thin-layer nanosheets. This method is convenient, fast, and has a large processing capacity. However, the white mica nanosheets peeled by sanding show obvious agglomeration. At the same time, due to the low peeling efficiency, the final yield is poor, only less than 10%, and the separation of the successfully peeled nanosheets from impurities is difficult, which limits the quality of the nanosheets obtained by this method.

[0080] In summary, the present invention provides a two-dimensional clay mineral nanosheet and a rapid and large-scale preparation method thereof. The rapid and large-scale preparation method of the two-dimensional clay mineral nanosheet comprises the steps of: mixing clay mineral powder with a solvent, treating it with a sand mill, and obtaining a sand-milled and thinned clay mineral solution; pre-treating the sand-milled and thinned clay mineral solution with a microjet homogenizer to obtain a pre-treated clay mineral solution; subjecting the pre-treated clay mineral solution to microjet homogenization treatment, and drying to obtain a two-dimensional clay mineral nanosheet. The present invention disperses clay mineral powder in a solvent and performs sand milling treatment to reduce the particle size of the raw material, and uses the high shear force generated by the microjet homogenization principle to peel off the clay mineral in the sand-milled and thinned clay mineral solution after sand milling, so as to obtain high-quality two-dimensional clay mineral nanosheets. In addition, the preparation method has the advantages of being fast, efficient and environmentally friendly. The preparation method for preparing two-dimensional clay mineral nanosheets has high yield (over 70%), fast speed (gram level per hour), and few defects, and can prepare high-quality thin-layer clay mineral nanosheets with micron-level lateral dimensions and several nanometers thickness.

[0081] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for rapidly preparing a large number of two-dimensional clay mineral nanosheets, characterized in that: Includes steps: The clay mineral powder is mixed with a solvent, and subjected to sand milling to obtain a sand milled and thinned clay mineral solution; Pre-treating the sand-milled and thinned clay mineral solution using a microfluidizer to obtain a pre-treated clay mineral solution; The pretreated clay mineral solution is subjected to microfluidization homogenization treatment and dried to obtain two-dimensional clay mineral nanosheets.

2. The method for rapidly preparing two-dimensional clay mineral nanosheets in large quantities according to claim 1, characterized in that: The clay mineral powder includes one or more of muscovite, phlogopite, biotite, vermiculite, chlorite, rectorite, talc, dickite and montmorillonite.

3. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The solvent is a mixture of one or more of water and anhydrous ethanol.

4. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The clay mineral powder is passed through a sieve with mesh size of 20 or more and then mixed with the solvent; the particle size of the sand-milled and thinned clay mineral in the sand-milled and thinned clay mineral solution is below 75 μm.

5. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The rotation speed of the sand grinding treatment is 2000rpm-3000rpm, and the time of the sand grinding treatment is 5min-30min.

6. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The sand grinding process uses zirconia balls with a diameter of 0.6 mm to 0.8 mm.

7. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The number of pretreatments is 1-5, and the pressure of the pretreatments is 400 bar-800 bar.

8. The method for rapid mass preparation of two-dimensional clay mineral nanosheets according to claim 1, characterized in that: The time of the microfluidic homogenization treatment is 5 min-30 min, and the pressure of the microfluidic homogenization treatment is 800 bar-1500 bar.

9. A two-dimensional clay mineral nanosheet, characterized in that: The two-dimensional clay mineral nanosheets are prepared by the rapid and large-scale preparation method as described in any one of claims 1 to 8.

10. The two-dimensional clay mineral nanosheet according to claim 9, characterized in that: The lateral size of the two-dimensional clay mineral nanosheet is between 500nm and 2μm.

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