Preparation method and application of multifunctional two-dimensional diatomic nano-enzyme material

Abstract

The invention relates to a preparation method and application of a multifunctional two-dimensional diatomic nano-enzyme material. The preparation method comprises the following steps: adding a certain amount of metal cerium ions into a mixed solution containing dopamine and cobalt ions, and then adding a hydrogen peroxide solution to induce auto-polymerization of dopamine molecules; and drying the dark brown mixture in a vacuum furnace to obtain CoCe-PDA precursor powder, and converting the CoCe-PDA precursor powder into the 2D nanosheet through a pyrolysis carbonization process in an Ar atmosphere. The multifunctional two-dimensional diatomic nano-enzyme material has excellent electromagnetic wave absorption performance, shows a remarkable antibacterial function, enhances peroxidase-like catalytic activity and promotes generation of active oxygen through orbital hybridization of diatomic sites, and has an efficient sterilization effect on escherichia coli and staphylococcus aureus.

Description

Technical Field

[0001] This invention belongs to the field of functional materials, and in particular relates to a method for preparing and applying a multifunctional two-dimensional diatomic nanoenzyme material. Background Technology

[0002] The rapid upgrading of information technology and communication equipment has driven the development of electronic devices towards higher frequencies and greater integration, but it has also brought about more complex electromagnetic environment problems, such as electromagnetic radiation and interference. This places stringent design requirements on electromagnetic absorption (EMA) materials. Meanwhile, the resistance of EMA materials to microbial contamination is receiving increasing attention in applications such as portable electronic products and medical devices. In this context, the development of multifunctional EMA systems that integrate superior electromagnetic protection performance and antibacterial capabilities has become an urgent need.

[0003] Transition metal single-atom (SA) materials with discrete energy level distributions and near 100% atom utilization offer promising opportunities for the design of multifunctional EMA systems. In particular, nitrogen-doped carbon (NC) nanosheets loaded with SA via the MNC pathway have attracted significant attention due to their strong metal-support interactions and programmable local electron mobility. The large potential difference between the metal SA and adjacent N / C atoms can trigger directional electron transfer, thereby disrupting the intrinsic symmetry of the electron cloud distribution within the carbon lattice and inducing local charge rearrangement. The resulting separation of positive and negative charge centers favors the formation of electric dipoles with larger moments, which in turn optimizes polarization relaxation behavior under incident electromagnetic wave (EMW) excitation. On the other hand, the MNC structure exhibits a structure similar to the active sites of natural enzymes, thus demonstrating enzyme-like catalytic activity, enabling the catalytic generation of reactive oxygen species (ROS) to kill adhering bacteria. However, the limited electron delocalization of transition metal SA sites hinders further enhancement of the dielectric loss capacity and antibacterial activity of NC-based EMA materials.

[0004] Orbital hybridization refers to the electronic coupling effect between orbitals of different metals. Introducing atoms with different orbital characteristics to form diatomic pairs with main transition metal atoms (such as Fe, Co, and Ni) is expected to exacerbate the distortion of the local electron cloud. Rare earth elements, with their abundant 4f orbitals and highly localized 4f electrons, are promising candidates for constructing diatomic configurations and can serve as effective electron pools to induce charge accumulation at transition metal atomic sites. Summary of the Invention

[0005] The technical problems solved by this invention are: 1. Although nitrogen-doped carbon materials supported by traditional transition metal single atoms (SA) possess certain electromagnetic wave absorption properties, they lack antibacterial functions, making it difficult to meet the needs of medical devices, portable electronics, and other applications requiring protection against microbial contamination. 2. The limited electron delocalization of metal single-atom sites in existing MNC structures restricts the dielectric loss capacity and antibacterial activity of the materials.

[0006] In view of the technical problems existing in the prior art, the present invention designs a method for preparing and applying a multifunctional two-dimensional two-atom nanoenzyme material.

[0007] It should be noted that, in this invention, unless otherwise specified, the specific meaning of "comprising" in relation to composition definition and description includes both open-ended meanings such as "comprising," "including," etc., and closed-ended meanings such as "composed of," etc., and similar meanings.

[0008] To solve the aforementioned technical problems, the present invention adopts the following solution: A method for preparing a multifunctional two-dimensional diatomic nanoenzyme material, comprising the following components by weight: Step 1: Dissolve dopamine in water, stir, add cobalt nitrate, and continue stirring to form a mixed solution; Step 2: Add the metal salt solution and oxidizing agent to the mixed solution from Step 1, and stir until the solution color darkens; Step 3: Dry the solution obtained in Step 2 into a solid, and then pyrolyze it in an inert atmosphere to obtain the multifunctional two-dimensional diatomic nanoenzyme material; The metal in the metal salt solution is one of cerium, iron, nickel, manganese, and molybdenum. The cobalt nitrate is in the amount of 60 parts by weight, and the amount of metal salt is 1 to 4 parts by weight.

[0009] Furthermore, the mass-to-volume ratio (g / mL) of dopamine dissolved in water in step 1 is 1:15-40.

[0010] Further, the oxidant in step 2 is a hydrogen peroxide solution, and the amount of hydrogen peroxide solution added is 0.5-2 mL per gram of dopamine.

[0011] Furthermore, the drying process described in step 3 specifically involves drying the product under vacuum at 60-80°C for 24 hours. The pyrolysis described in step 3 is carried out at a temperature of 600-1000℃, a heating rate of 3-10℃ / min, and a holding time of 1-4 hours.

[0012] Furthermore, the inert atmosphere is argon or nitrogen, and the gas flow rate is 100-500 sccm.

[0013] The present invention also discloses a multifunctional two-dimensional diatomic nanoenzyme material, which is prepared by the above preparation method.

[0014] Furthermore, the multifunctional two-dimensional diatomic nanoenzyme material has an ultrathin sheet-like morphology and is loaded with well-dispersed 5-20nm nanoparticles on its surface; the main component of the nanoparticles is metallic cobalt, and the diatomic part mainly refers to cobalt atoms and adsorbed cerium, iron, nickel, manganese and molybdenum atoms.

[0015] The present invention also discloses the application of the above-mentioned multifunctional two-dimensional diatomic nanoenzyme material in electromagnetic wave absorption, antibacterial materials and protective materials for portable electronic devices.

[0016] Specific application methods can be: 1. Medical Equipment Protection System Application scenarios: sterilization chambers for surgical instruments, shielding layers for MRI equipment, wearable medical monitoring devices, etc. By spraying or coating nanoenzyme materials onto the surface of medical devices to form an antibacterial film, effective inhibition of Escherichia coli and Staphylococcus aureus is achieved, while avoiding the impact of electromagnetic leakage from the equipment on medical personnel.

[0017] 2. Protective casing for 5G smart terminals Application scenarios: mobile phones, AR / VR devices, satellite communication terminals, etc. By fabricating an electromagnetic shielding layer, it effectively isolates 5G millimeter-wave radiation and can also achieve continuous inhibition of bacteria in humid environments.

[0018] 3. Intelligent Cockpit for New Energy Vehicles Application scenarios: automotive radar systems, battery pack EMI protection, autonomous driving sensor arrays, etc. By fabricating it into the housing of automotive millimeter-wave radar, or integrating it into the cabin roof as a reconfigurable smart metasurface, the impact of electromagnetic interference on autonomous driving signals can be reduced, while inhibiting bacterial adhesion to the material surface.

[0019] This application found that, among rare earth species, Ce element is due to [Xe]4f 1 5d 1 6s 2 The unique electronic configuration of Ce atoms is highly attractive, with some of the 4f orbitals being occupied by only one electron. This means that when the 4f orbitals of Ce atoms overlap with the d orbitals of transition metal atoms, the electron coupling between orbitals will be stronger, thereby enhancing electron transfer and optimizing dielectric relaxation properties. However, in the design of multifunctional EMA systems, there is limited research on Ce atom sites, and the fundamental mechanism of orbital hybridization effects between Ce and transition metal atoms in controlling EMW decay and antibacterial properties cannot be fully elucidated.

[0020] In this invention, an NC-based EMA system was designed using a simple adsorption pyrolysis method. This system has a novel Co-Ce configuration, in which Co nanoparticles and Co-Ce diatomic sites are co-dispersed on the surface of NC nanosheets.

[0021] In this invention, Co sites dominate the dielectric loss characteristics, while approximately 10 nm Co nanoparticles supplement the magnetic loss characteristics. The integration of Ce atomic sites induces orbital hybridization between Co3d and Ce4f orbitals, which enhances local charge accumulation at Co sites via the Ce-N-Co pathway. Enhanced electron delocalization leads to enhanced polarization response, thereby promoting the energy consumption of the EMW.

[0022] Meanwhile, the strong electronic coupling interaction between Co-Ce atom pairs and the NC substrate promotes local charge transfer, partially repairing the loss of conductivity.

[0023] This invention provides a method for preparing and applying a multifunctional two-dimensional diatomic nanoenzyme material, which has the following beneficial effects: 1. The multifunctional two-dimensional diatomic nanoenzyme material of the present invention has excellent electromagnetic wave absorption performance. When the matching thickness is only 1.7 mm, the maximum absorption intensity can reach -85.1 dB and the effective absorption bandwidth reaches 7.6 GHz, exhibiting wide-band strong absorption characteristics.

[0024] 2. The multifunctional two-dimensional diatomic nanoenzyme material of the present invention has significant antibacterial function. It enhances the catalytic activity of peroxidase-like enzymes through orbital hybridization of diatomic sites, promotes the generation of reactive oxygen species, and has a highly efficient bactericidal effect on Escherichia coli and Staphylococcus aureus.

[0025] 3. The multifunctional two-dimensional diatomic nanoenzyme material of this invention has strong controllability in structure and performance. By adjusting process parameters such as Ce doping amount and pyrolysis temperature, the electromagnetic parameters, microstructure and antibacterial activity of the material can be precisely controlled, making it suitable for different application scenarios. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the synthesis process of the multifunctional two-dimensional diatomic nanozyme material CoCe@NC in Example 1 of the present invention; Figure 2 The following images are: a) dark-field TEM image, b) magnified TEM image (inset shows HRTEM image of loaded nanoparticles), c) elemental distribution map, d, e) AC-STEM image and f) corresponding intensity distribution of the two-dimensional diatomic nanozyme material CoCe@NC prepared in Example 1 of this invention; Figure 3: Synchrotron radiation spectra of the ac)Co K-edge and df)Ce L3-edge of the multifunctional two-dimensional diatomic nanoenzyme material CoCe@NC prepared in Example 1 of this invention and the standard sample; Figure 4 : The electromagnetic wave absorption performance of the multifunctional two-dimensional diatomic nanoenzyme material CoCe@NC prepared in Example 1 of the present invention; a) Co@NC, b) two-dimensional electromagnetic wave reflection loss of CoCe@NC, c) Co@NC, d) three-dimensional electromagnetic wave reflection loss performance of CoCe@NC. Figure 5 : This is a diagram showing the antibacterial properties of the multifunctional two-dimensional diatomic nanozyme material CoCe@NC prepared in Example 1 of this invention; a) Plate count colony photograph, b) Live / dead bacteria staining fluorescence photograph, c) Relative survival rate of Escherichia coli and d) Staphylococcus aureus after co-cultivation with the prepared multifunctional two-dimensional diatomic nanozyme material CoCe@NC. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments and accompanying drawings: The raw materials used in the embodiments of the present invention are as follows: dopamine hydrochloride (DA, 98%), cobalt nitrate hexahydrate (Co(NO3)2•6H2O, 99%), cerium (III) nitrate hexahydrate (CeN3O9·6H2O), ferric nitrate nonahydrate (Fe(NO3)3·9H2O), nickel nitrate hexahydrate (Ni(NO3)2•6H2O), manganese nitrate hexahydrate (Mn(NO3)2·6(H2O)), and ammonium molybdate ((NH4)2MoO4) were purchased from Maclin; hydrogen peroxide solution (H2O2, 30wt%) was purchased from Maokang Biotechnology Co., Ltd.

[0028] All chemicals are used directly without further purification.

[0029] Example 1

[0030] Step 1: Dissolve 1.0g of dopamine in 20 mL of deionized water and stir for 30 minutes, then add 0.6g of cobalt nitrate hexahydrate and stir for another 30 minutes.

[0031] Step 2: Then add 30 mg of cerium nitrate hexahydrate and 1 mL of hydrogen peroxide solution to the mixed solution, and continue stirring until the solution turns dark brown.

[0032] Step 3: The mixture is then transferred to a vacuum oven and dried at 60°C for 24 hours overnight.

[0033] The obtained solid was ground into powder, placed in a tube furnace, and pyrolyzed at a thermal rate of 5 °C / min under an Ar gas flow rate of 300 sccm. After being held at 800 °C for 2 hours and cooled to room temperature, the composite material CoCe@NC was obtained.

[0034] Example 2

[0035] Step 1: Dissolve 1.0g of dopamine in 15 mL of deionized water and stir for 30 minutes, then add 0.6g of cobalt nitrate hexahydrate and stir for another 30 minutes.

[0036] Step 2: Then add 10 mg of cerium nitrate hexahydrate and 0.5 mL of hydrogen peroxide solution to the mixed solution, and continue stirring until the solution turns dark brown.

[0037] Step 3: The mixture is then transferred to a vacuum oven and dried at 70°C for 24 hours overnight.

[0038] The obtained solid was ground into powder and placed in a tube furnace. It was pyrolyzed at a thermal rate of 10 °C / min under an Ar gas flow rate of 100 sccm. After being held at 1000 °C for 1 hour and cooled to room temperature, the composite material CoCe@NC was obtained.

[0039] Performance characterization shows that the prepared material has an ultrathin sheet structure with well-dispersed 10nm nanoparticles loaded on the surface, and the antibacterial effect reaches more than 70%, indicating that even at lower cerium doping and pyrolysis temperatures, the material still has good electromagnetic absorption and antibacterial properties.

[0040] Example 3

[0041] Step 1: Dissolve 1.0g of dopamine in 40 mL of deionized water and stir for 30 minutes, then add 0.6g of cobalt nitrate hexahydrate and stir for another 30 minutes.

[0042] Step 2: Then add 40 mg of cerium nitrate hexahydrate and 2 mL of hydrogen peroxide solution to the mixed solution, and continue stirring until the solution turns dark brown.

[0043] Step 3: The mixture is then transferred to a vacuum furnace and dried at 80°C for 24 hours overnight.

[0044] The obtained solid was ground into powder, placed in a tube furnace, and pyrolyzed at a thermal rate of 3 °C / min under an Ar gas flow rate of 500 sccm. After being held at 600 °C for 4 hours and cooled to room temperature, the material was obtained and denoted as CoCe@NC.

[0045] Performance characterization shows that the prepared material has an ultrathin sheet structure with well-dispersed 10nm nanoparticles on the surface, and the antibacterial effect reaches more than 75%, indicating that higher cerium doping and pyrolysis temperature can further improve the overall performance of the material.

[0046] Example 4

[0047] In this embodiment, keeping other reaction conditions unchanged, 20 mg of ammonium molybdate was added in step 2 to prepare the material denoted as CoMo@NC.

[0048] Example 5

[0049] In this embodiment, keeping other reaction conditions unchanged, 20 mg of manganese nitrate hexahydrate was added in step 2 to prepare the material denoted as CoMn@NC.

[0050] Example 6

[0051] In this embodiment, keeping other reaction conditions unchanged, 20 mg of nickel nitrate hexahydrate was added in step 2 to prepare the material denoted as CoNi@NC.

[0052] Example 7

[0053] In this embodiment, keeping other reaction conditions unchanged, 20 mg of ferric nitrate nonahydrate was added in step 2 to prepare the material denoted as CoFe@NC.

[0054] The materials prepared in Examples 4-7 all have an ultrathin sheet structure, with well-dispersed 5-20nm nanoparticles loaded on the surface. Their maximum electromagnetic wave absorption intensity is better than -60dB, the effective absorption bandwidth is greater than 6.0GHz, and the antibacterial effect against Escherichia coli and Staphylococcus aureus is higher than 65%.

[0055] The nanozyme material CoCe@NC in Example 1 of the present invention will be further described with reference to the accompanying drawings: In Example 1, a certain amount of cerium ions was added to a mixed solution containing dopamine and cobalt ions, followed by the addition of hydrogen peroxide solution to induce the self-polymerization of dopamine molecules. The dark brown mixture was then dried in a vacuum furnace to obtain CoCe-PDA precursor powder, which was subsequently converted into 2D nanosheets via pyrolysis carbonization under an Ar atmosphere. The specific operation process is as follows: Figure 1 As shown.

[0056] The nanozyme material CoCe@NC prepared in Example 1 was characterized as follows: First, the morphology and microstructure of the product were studied by transmission electron microscopy (TEM).

[0057] Figure 2a) Dark-field TEM image, b) magnified TEM image (inset shows HRTEM image of loaded nanoparticles), c) elemental distribution map, d, e) AC-STEM images and f) corresponding intensity distribution of the multifunctional two-dimensional diatomic nanozyme material CoCe@NC prepared in Example 1 of this invention.

[0058] like Figure 2 The dark-field TEM image shown indicates that the CoCe@NC nanoenzyme material exhibits an ultrathin sheet-like morphology with well-dispersed nanoparticles of approximately 10 nm on its surface. Furthermore, Co and Ce elements were determined to be uniformly distributed on the nanosheets. Figure 2 The 'c' in the figure indicates the loading of atomic-level Co and Ce sites.

[0059] Further aberration-corrected scanning transmission electron microscopy (AC-STEM) tests were performed to verify the presence of the Co and Ce dual single atoms. Figure 2 d and Figure 2 (e). Due to their higher energy density than carbon species, Co and Ce atoms can be identified as isolated bright spots. Furthermore, Co-Ce atom pairs can be clearly detected in magnified AC-STEM images. Figure 2 (e), for example, the diatomic sites marked with yellow rectangles. The corresponding intensity line profiles show that the diatomic sites exhibit different intensities within a distance of approximately 0.25 nm. Figure 2 (f) further confirms the formation of a specific cobalt-cerium pair. These results indicate that Co nanoparticles and Co-Ce dual single atoms are co-loaded in the CoCe@NC nanozyme material.

[0060] Secondly, Figure 3 The images show the synchrotron radiation spectra of the multifunctional two-dimensional diatomic nanoenzyme material CoCe@NC prepared in Example 1 of this invention and the standard sample's ac)Co K-edge and df)Ce L3-edge.

[0061] The synchrotron radiation spectrum obtained by Fourier transform shows that Co and Ce elements in the CoCe@NC nanozyme material are anchored to the carbon matrix through Co-N and Ce-N bonds. Furthermore, no obvious Ce-Ce scattering path was observed, further confirming the presence of Ce atomic sites in the nanozyme material.

[0062] Third, electromagnetic parameter measurement: Electromagnetic parameters CoCe@NC were recorded using a vector network analyzer (VNA, Agilent E5071c). During a typical testing process, the sample was compressed into a coaxial ring with an outer diameter of 7.0 mm, an inner diameter of 3.0 mm, and a thickness of 2.0 mm. Based on transmission line theory, the reflection loss of the nanoenzyme material was calculated using the following equation:

[0063] Z in Z0 represents the input impedance and free space impedance, respectively, and ε represents the free space impedance. r and μ r Represents the complex permittivity and permeability. f , d and c Representing electromagnetic wave frequency, matching thickness, and speed of light respectively, tanh represents the hyperbolic tangent function, and j represents the imaginary unit (j 2 =-1), RL represents the electromagnetic wave reflection loss value.

[0064] Figure 4 The images show the electromagnetic wave absorption performance of the multifunctional two-dimensional diatomic nanoenzyme material CoCe@NC prepared in Example 1 of this invention; a) Co@NC, b) two-dimensional electromagnetic wave reflection loss of CoCe@NC, c) Co@NC, d) three-dimensional electromagnetic wave reflection loss performance of CoCe@NC.

[0065] from Figure 4 As can be seen, the nanozyme material Co@NC exhibits a maximum absorption intensity of -44.8 dB, with an effective absorption bandwidth of 6.7 GHz and a matching thickness of 1.7 mm. After introducing Ce sites, the maximum absorption intensity of the CoCe@NC nanozyme is enhanced to -85.1 dB, while the effective absorption bandwidth is broadened to 7.6 GHz.

[0066] Fourth, regarding the evaluation of antibacterial properties: Figure 5 The images show the antibacterial properties of the multifunctional two-dimensional diatomic nanozyme material CoCe@NC prepared in Example 1 of this invention: a) plate count colony photograph, b) live / dead bacteria staining fluorescence photograph, c) relative survival rate of Escherichia coli and d) Staphylococcus aureus after co-culturing with the prepared multifunctional two-dimensional diatomic nanozyme material CoCe@NC.

[0067] Plate colony counting analysis was further used to verify the antibacterial properties of the prepared CoCe@NC nanozyme. In the in vitro antibacterial experiment, Gram-negative *Escherichia coli* (E. coli) and Gram-positive *Staphylococcus aureus* (S. aureus) colonies were selected as microbial models. The pH and H2O2 concentration in the culture environment were set to 4.0 and 1 mM, respectively. Bacterial strains were divided into five different groups: control group, Co, Co + H2O2, CoCe, and CoCe + H2O2, where Co and CoCe represent Co@NC and CoCe@NC, respectively.

[0068] like Figure 5 As shown in a, similar levels of colony reduction were observed in both the Co+H2O2 and CoCe groups, which was superior to the inhibitory effect of the Co group. Meanwhile, a more pronounced colony reduction was observed in the CoCe+H2O2 group, indicating that the construction of the Co-Ce configuration contributes to improved antibacterial properties.

[0069] For the CoCe+H2O2 group, the relative survival rates of Escherichia coli and Staphylococcus aureus after culture were only 29.0% and 21.9%, respectively. Figure 5 c and Figure 5 (d in the text)

[0070] This result can be further verified by a live / dead bacteria staining test. Figure 5 In group b), green and red represent live and dead bacteria, respectively. In the CoCe+H2O2 group, almost all Escherichia coli and Staphylococcus aureus were marked red after incubation, indicating that the generated ROS severely damaged the cell structure, leading to bacterial inactivation.

[0071] The above results indicate that the local electronic structure can be effectively optimized by hybridizing the Co3d and Ce4f orbitals, resulting in excellent antibacterial properties of the CoCe@NC nanozyme.

[0072] The multifunctional two-dimensional diatomic nanoenzyme material of this invention has excellent electromagnetic wave absorption performance and significant antibacterial function. It enhances the catalytic activity of peroxidase-like enzymes through orbital hybridization of diatomic sites, promotes the generation of reactive oxygen species, and has a highly efficient bactericidal effect on Escherichia coli and Staphylococcus aureus.

[0073] The present invention has been described above by way of example with reference to the embodiments and accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for preparing a multifunctional two-dimensional diatomic nanoenzyme material, characterized in that, Includes the following steps: Step 1: Dissolve dopamine in water, stir, add cobalt nitrate, and continue stirring to form a mixed solution; Step 2: Add the metal salt solution and oxidizing agent to the mixed solution from Step 1, and stir until the solution color darkens; Step 3: Dry the solution obtained in Step 2 into a solid, and then pyrolyze it in an inert atmosphere to obtain the multifunctional two-dimensional diatomic nanoenzyme material; The metal in the metal salt solution is one of cerium, iron, nickel, manganese, and molybdenum. The cobalt nitrate is used in 60 parts by weight, and the amount of metal salt is 1 to 4 parts by weight.

2. The method for preparing the multifunctional two-dimensional diatomic nanoenzyme material according to claim 1, characterized in that: The mass-to-volume ratio (g / mL) of dopamine dissolved in water in step 1 is 1:15-40.

3. The method for preparing the multifunctional two-dimensional diatomic nanoenzyme material according to claim 1, characterized in that: The oxidant mentioned in step 2 is a hydrogen peroxide solution, and the amount of hydrogen peroxide solution added is 0.5-2 mL per gram of dopamine.

4. The method for preparing the multifunctional two-dimensional diatomic nanoenzyme material according to claim 1, characterized in that: The drying process described in step 3 specifically involves drying the product under vacuum at 60-80°C for 24 hours. The pyrolysis described in step 3 is carried out at a temperature of 600-1000℃, a heating rate of 3-10℃ / min, and a holding time of 1-4 hours.

5. The method for preparing the multifunctional two-dimensional diatomic nanoenzyme material according to claim 1, characterized in that: The inert atmosphere is argon or nitrogen, and the gas flow rate is 100-500 sccm.

6. A multifunctional two-dimensional diatomic nanoenzyme material, characterized in that, It is prepared by the preparation method described in any one of claims 1-5.

7. The multifunctional two-dimensional diatomic nanoenzyme material according to claim 6, characterized in that: The multifunctional two-dimensional diatomic nanoenzyme material has an ultrathin sheet-like morphology and is loaded with well-dispersed 5-20nm nanoparticles on its surface; the main component of the nanoparticles is metallic cobalt, and the diatomic part mainly refers to cobalt atoms and adsorbed cerium, iron, nickel, manganese and molybdenum atoms.

8. The application of the multifunctional two-dimensional diatomic nanoenzyme material according to any one of claims 6-7 in electromagnetic wave absorption, antibacterial materials, and protective materials for portable electronic devices.

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