Biochar material and manufacturing method thereof having a graphene-like structure

Abstract

A type of graphene-like biochar material comprises a type of graphene biochar material and a type of graphene structure. The type of graphene biochar material is made from a biological material, and the type of graphene structure is formed on a type of graphene layer, and the type of graphene layer is formed on the type of graphene biochar material, and the type of graphene structure has a type of graphene lattice.

Description

Biochar Material with Graphene-like Structure and Its Preparation Method The present invention relates to a biochar material with a graphene-like structure, its preparation method and its system; in particular, it relates to a biochar with a graphene-like structure made from waste plant materials, its preparation method and its system. For example, in the conventional method for preparing sorghum distillers' grains biochar and its uses, such as the invention patent of "A Method for Preparing Functional Cultivation Medium Biochar from Sorghum Distillers' Grains and Its Uses" in the Republic of China Patent Publication No. TW-I602796, it discloses a method for preparing sorghum distillers' grains biochar (SDR Biochar). The method for preparing sorghum distillers' grains biochar includes: placing a sorghum distillers' grains into a high-temperature activation furnace and carbonizing it at a carbonization temperature (selecting 200°C to -450°C) in an anaerobic state. Continuing from the above, the method for preparing sorghum distillers' grains biochar in the aforementioned TW-I602796 further includes: selecting a heating rate of 10°C / min to 20°C / min, introducing an inert gas (such as nitrogen) during the carbonization process, selecting a gas flow rate of 100 mL / min to 200 mL / min, and selecting a holding temperature for 30 minutes to 60 minutes; finally, cooling is carried out by introducing an inert gas (such as nitrogen) into the high-temperature activation furnace, and a sorghum distillers' grains biochar can be obtained. Another conventional method for preparing porous biochar and its material, such as the invention patent of "Method for Preparing Biochar Generated at High Temperature" in the Republic of China Patent Publication No. TW-I701214, it discloses a method for preparing biochar generated at high temperature. The method for preparing biochar generated at high temperature includes: obtaining a biomass energy raw material, which is selected from biomass energy raw materials in the natural environment, and the biomass energy raw material is a forestry resource or an agricultural resource. Continuing from the above, the method for preparing biochar generated at high temperature in the aforementioned TW-I701214 further includes: a high-temperature melting step, which places the biomass energy raw material into the high-temperature melting furnace and smelts it at a temperature (700°C to 2200°C) to melt the biomass energy raw material into a molten slurry; then, a cooling treatment step, which cools down the molten slurry by using a quenching method. The quenching method is to use a low-temperature cooling substance to cool down the molten slurry, and the low temperature is defined as a temperature lower than the molten slurry and capable of cooling, so that the molten slurry cools and solidifies into a porous biochar filter material. Another conventional method for preparing porous biochar and its materials, such as the invention patent of "Novel Porous Biochar Ceramsite and Its Preparation Method" in Republic of China Patent Publication No. TW-I717053, which discloses a porous biochar ceramsite. The porous biochar ceramsite comprises an inorganic matter containing a silicate compound and a biochar. Continuing from the above, the biochar in the aforementioned TW-I717053 is admixed in the inorganic matter containing the silicate compound, and the surface of the porous biochar ceramsite has a pore, and the pore communicates with the interior of the porous biochar ceramsite, and the porous biochar ceramsite has a water holding capacity of 25% to 50%, and the specific surface area of the porous biochar ceramsite is 9 g / m 2 to 18 g / m 2 . Another conventional method for preparing biochar containing microorganisms, its uses and its water purification method, such as the invention patent of "Method for Preparing Biochar, Feed Additive Containing Biochar, Its Uses, Its Administration Method and Its Method for Purifying Water Quality" in Republic of China Patent Publication No. TW-I750864, which discloses a feed additive. The feed additive comprises a biochar having microorganisms. Continuing from the above, the biochar having microorganisms in the aforementioned TW-I750864 comprises a biochar and a microorganism, and the particle size range of the biochar is 10 microns to 1000 microns, and the microorganism is selected from the group consisting of an alga, a Bacillus spore group, a photosynthetic group, a lactic acid group, a yeast group and a Vibrio group. The microorganism grows on the surface of the biochar, and the microorganism also grows in several pores of the biochar. Another conventional method for preparing water bamboo shell biochar and its materials, such as the invention patent application of "Method for Manufacturing Biochar" in Republic of China Patent Publication No. TW-202204250, which discloses a method for manufacturing biochar. The method for manufacturing biochar comprises: placing a plant raw material into a heating chamber of a heating furnace, and the plant raw material comprises a water bamboo shell. Continuing from the above, the method for manufacturing biochar in the aforementioned TW-202204250 further comprises: injecting nitrogen gas into the heating chamber; and the heating furnace heating the plant raw material in the heating chamber at a calcination temperature for a cracking time, so that the plant raw material forms a biochar after heating. Additionally, the calcination temperature is selected between 490 °C and 710 °C, and the cracking time is selected between 1.8 hours and 2.2 hours. Another conventional method for preparing porous biochar and its materials, such as the invention patent application of "Porous Biochar, Its Manufacturing Method, Method for Adsorbing Non-Polar Substances, and Composite Fuel" in Republic of China Patent Publication No. TW-202212257, discloses a method for manufacturing porous biochar. The method for manufacturing porous biochar includes: providing a biomass material, and the biomass material is in a powder form. Continuing from the above, the method for manufacturing the porous biochar of the aforementioned TW-202212257 further includes: performing an impregnation step of placing the biomass material in a pore-forming solution for soaking to obtain an impregnated biomass material; and performing a thermochemical conversion step of heating the impregnated biomass material in an inert atmosphere to convert the impregnated biomass material into a porous biochar. Another conventional method for preparing biogas residue biochar and its materials, such as the invention patent application of "Method for Preparing High Specific Surface Area Biochar-Based Metal Ion Adsorbent Using Biogas Residue" in Republic of China Patent Publication No. TW-202214519, discloses a method for preparing a high specific surface area biochar-based metal ion adsorbent using biogas residue. The method for preparing a high specific surface area biochar-based metal ion adsorbent using biogas residue includes a crushing step, a carbonization step, an activation step, a washing step, and a drying step. Continuing from the above, the crushing step of the aforementioned TW-202214519: crushing a biogas residue raw material to obtain a crushed biogas residue raw material; the carbonization step: placing the crushed biogas residue raw material into a high-temperature furnace and introducing an inert gas for carbonization reaction, and obtaining a carbonized product after the reaction is completed. Continuing from the above, the activation step of the aforementioned TW-202214519: mixing the carbonized product with potassium hydroxide in a ratio (1:1 to 1:4), placing the mixture of the carbonized product and potassium hydroxide in the high-temperature furnace and introducing an inert gas, and performing an activation reaction at a reaction temperature (800°C to 1000°C) for a reaction time (1 to 3 hours), and obtaining an activated product after the reaction is completed; the washing step: washing the activated product with a strong acid and deionized water; and the drying step: drying the activated product after washing to obtain a biogas residue carbon material. However, although the aforementioned Republic of China Patents TW-I602796, TW-I701214, TW-I717053, TW-I750864 and the aforementioned Republic of China Patent Publications TW-202204250, TW-202212257 and TW-202214519 applications have provided various methods for preparing biochar and their materials, they still cannot meet the actual technical requirements (for example: improving the performance of materials or providing special structures of materials), so there must be a potential need to further improve their preparation methods and systems. Obviously, the aforementioned Republic of China Patent Publications Nos. TW-I602796, TW-I701214, TW-I717053, TW-I750864 and the aforementioned Republic of China Patent Applications Nos. TW-202204250, TW-202212257 and TW-202214519 are only for reference of the technical background of the present invention and to illustrate the current state of technological development, and they are not used to limit the scope of the present invention. In view of this, in order to meet the above technical problems and requirements, the present invention provides a biochar material with a graphene-like structure and a preparation method thereof. It performs a first grinding operation on a dried biological material to obtain a dried biological powder material, and performs hydrothermal decomposition on the dried biological powder material by hydrothermal method to obtain a hydrothermal carbonization precursor, and mixes the hydrothermal carbonization precursor with a modifying material for surface modification to obtain a preliminarily modified carbide. Then, the preliminarily modified carbide is subjected to a second grinding operation to obtain a preliminarily modified powder material, and the preliminarily modified powder material is subjected to high-temperature pyrolysis to obtain a modified carbide, and the modified carbide is washed and dried to obtain a graphene-like biochar material. Therefore, compared with the conventional biochar preparation method and its materials, it can provide the advantages of its graphene-like structure and its characteristics. The main object of the present invention is to provide a biochar material with a graphene-like structure and a preparation method thereof. It performs a first grinding operation on a dried biological material to obtain a dried biological powder material, and performs hydrothermal decomposition on the dried biological powder material by hydrothermal method to obtain a hydrothermal carbonization precursor, and mixes the hydrothermal carbonization precursor with a modifying material for surface modification to obtain a preliminarily modified carbide. Then, the preliminarily modified carbide is subjected to a second grinding operation to obtain a preliminarily modified powder material, and the preliminarily modified powder material is subjected to high-temperature pyrolysis to obtain a modified carbide, and the modified carbide is washed and dried to obtain a graphene-like biochar material, so as to achieve the purpose and effect of providing a graphene-like structure and its characteristics. To achieve the above object, the graphene-like biochar material of the preferred embodiment of the present invention includes: A graphene-like biochar material made from a biological material; and A graphene-like structure formed on a graphene-like layer, and the graphene-like layer is formed on the graphene-like biochar material; Wherein the graphene-like structure has a graphene-like lattice. In a preferred embodiment of the present invention, a dried biological material is subjected to a first grinding operation to obtain a dried biological powder material, and the dried biological powder material is hydrothermally decomposed by a hydrothermal method to obtain a hydrothermal carbonization precursor, and the hydrothermal carbonization precursor is mixed with a modifying material for surface modification to obtain a preliminarily modified carbide, and then the preliminarily modified carbide is subjected to a second grinding operation to obtain a preliminarily modified powder material, and the preliminarily modified powder material is subjected to high-temperature pyrolysis to obtain a modified carbide, and the modified carbide is washed and dried to obtain a graphene-like biochar material. The biological material in the preferred embodiment of the present invention is selected from an agricultural waste biological material. The biological material in the preferred embodiment of the present invention is selected from a plant shell material, a herbaceous plant material, a woody plant material or any combination thereof. The plant shell material in the preferred embodiment of the present invention is selected from a water chestnut shell material, a peanut shell material or any combination thereof. The woody plant material in the preferred embodiment of the present invention includes a softwood material and a hardwood material. To achieve the above object, a method for preparing a biochar material with a graphene-like structure in a preferred embodiment of the present invention includes: Performing a first grinding operation on a dried biological material to obtain a dried biological powder material; Hydrothermally decomposing the dried biological powder material by a hydrothermal method to obtain a hydrothermal carbonization precursor; Mixing the hydrothermal carbonization precursor with a modifying material for surface modification to obtain a preliminarily modified carbide; Performing a second grinding operation on the preliminarily modified carbide to obtain a preliminarily modified powder material; Performing high-temperature pyrolysis on the preliminarily modified powder material to obtain a modified carbide; and Washing and drying the modified carbide to obtain a graphene-like biochar material. In a preferred embodiment of the present invention, the hydrothermal carbonization precursor is cooled to a room temperature value. The modifying material in the preferred embodiment of the present invention is selected from a strong base material or a material containing a strong base substance. In a preferred embodiment of the present invention, the preliminarily modified powder material is subjected to high-temperature pyrolysis in an anaerobic environment. In a preferred embodiment of the present invention, the graphene-like biochar material is processed until its pH value is stable. 1: Graphene-like biochar material 10: Graphene-like structure 11: Graphene-like lattice 100: Biological material Figure 1: Block schematic diagram of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention. Figure 2: Flow schematic diagram of the preparation method of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention. Figures 3A and 3B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the first type of graphene structure in the graphene layer and its lattice. Figures 4A and 4B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the second type of graphene structure in the graphene layer and its lattice. Figures 5A and 5B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the third type of graphene structure in the graphene layer and its lattice. Figures 6A and 6B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the fourth type of graphene structure in the graphene layer and its lattice. Figures 7A and 7B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the fifth type of graphene structure in the graphene layer and its lattice. Figures 8A and 8B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the sixth type of graphene structure in the graphene layer and its lattice. Figures 9A and 9B: Transmission electron microscopy images of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention, showing the seventh type of graphene structure in the graphene layer and its lattice. In order to fully understand the present invention, preferred embodiments will be exemplified and described in detail below in conjunction with the accompanying drawings, and it is not intended to limit the present invention. The biochar material with a graphene-like structure according to the preferred embodiment of the present invention, its preparation method and its system are applicable to various photocatalyst additive materials, various electrochemical electrode structure additive materials, various sensing element additive materials, the main raw material or additive material of various adsorbents or various related raw materials or additive materials, but it is not intended to limit the application scope of the present invention. Figure 1 discloses a block schematic diagram of the biochar material with a graphene-like structure according to the preferred embodiment of the present invention. Referring to Figure 1, the biochar material with a graphene-like structure according to the preferred embodiment of the present invention includes a type of graphene biochar material 1 and a type of graphene structure 10, and the type of graphene structure 10 is formed on the type of graphene biochar material 1. Referring again to FIG. 1, for example, the graphene biochar material 1 can be optionally made from a biological material 100, and the biological material 100 can be selected from an agricultural waste biological material, and the biological material 100 can be selected from a plant shell material, a herbaceous plant material, a woody plant material, or any combination thereof. Referring again to FIG. 1, for example, the graphene structure 10 is formed on a graphene layer or a graphene-layered structure (as shown in each transmission electron microscope (TEM) image), and the graphene layer is appropriately formed on the graphene biochar material 1, and the graphene structure 10 has a graphene lattice 11 (as shown in each transmission electron microscope image). FIG. 2 discloses a flowchart of a method for preparing a biochar material with a graphene structure according to a preferred embodiment of the present invention. Referring to FIGS. 1 and 2, for example, the method for preparing a biochar material with a graphene structure according to a preferred embodiment of the present invention includes step S1: First, a dried biological material (i.e., biological material 100) is appropriately subjected to a first grinding operation by appropriate technical means (e.g., automatic, semi-automatic, or manual means) to obtain a dried biological powder material. Referring again to FIGS. 1 and 2, for example, the plant shell material of the biological material 100 can be selected from a water chestnut shell material, a peanut shell material, or any combination thereof, or the woody plant material of the biological material 100 can be selected from a rice straw material, or the woody plant material of the biological material 100 includes a softwood material and a hardwood material. Referring again to FIGS. 1 and 2, for example, the biological material 100 can be optionally washed several times with deionized water (DI water), and the biological material 100 is placed in an oven device and appropriately dried at a predetermined temperature (e.g., 105 °C or other temperature) for a predetermined time (e.g., 24 hours or other time), and the dried biological material of the biological material 100 is appropriately cooled. Referring again to FIGS. 1 and 2, for example, the dried biological powder material can be optionally ground and broken by mechanical means to form a powder (e.g., grinding and breaking lumps or other materials to form a powder), and the dried biological powder material is optionally sieved through a 100-mesh sieve (<0.154 mm) or other mesh specifications. Referring again to FIGS. 1 and 2, for example, the preparation method of the biochar material with a graphene-like structure in the preferred embodiment of the present invention includes step S2: Next, the dried bio-powder material is appropriately hydrothermally decomposed by a suitable technical means (for example: automatic mode, semi-automatic mode or manual mode) by the hypothermal method, so as to obtain at least one hydrothermal carbonization precursor. Referring again to FIGS. 1 and 2, for example, the dried bio-powder material and deionized water are appropriately mixed at a predetermined solid-liquid ratio (for example: 1 g: 50 mL or other ratios) and then placed in a hydrothermal synthesis reaction device (for example: autoclave or other sealed container devices), so that the graphene-like structure 10 can be formed in the biochar material subsequently. Referring again to FIGS. 1 and 2, for example, the hydrothermal carbonization precursor is appropriately cooled to a predetermined temperature or a room temperature value, and the hydrothermal carbonization precursor is appropriately rinsed several times with deionized water, and the hydrothermal carbonization precursor is placed in an oven device at a predetermined temperature (for example: 105 °C or other temperatures) and appropriately dried for a predetermined time (for example: 24 hours or other times). Referring again to FIGS. 1 and 2, for example, the preparation method of the biochar material with a graphene-like structure in the preferred embodiment of the present invention includes step S3: Next, the hydrothermal carbonization precursor is mixed with at least one modifying material by a suitable technical means (for example: automatic mode, semi-automatic mode or manual mode) and appropriately surface-modified to obtain a preliminary modified carbide. Referring again to FIGS. 1 and 2, for example, the modifying material is selected from a strong alkali material (for example: potassium hydroxide KOH) or a material containing a strong alkali substance, and there is a predetermined ratio (for example: weight percentage 1: 4) between the hydrothermal carbonization precursor and the modifying material, and the hydrothermal carbonization precursor and the modifying material can alternatively be added with deionized water and appropriately stirred for a predetermined time (for example: 6 hours or other times). Referring again to FIGS. 1 and 2, for example, the preparation method of the biochar material with a graphene-like structure in the preferred embodiment of the present invention includes step S4: Next, the preliminary modified carbide is appropriately subjected to a second grinding operation by a suitable technical means (for example: automatic mode, semi-automatic mode or manual mode) to obtain a preliminary modified powder material. Referring again to FIGS. 1 and 2, for example, the preparation method of the biochar material with a graphene-like structure in the preferred embodiment of the present invention includes step S5: Next, the preliminary modified powder material can be appropriately subjected to high-temperature pyrolysis at a predetermined pyrolysis temperature by a suitable technical means (for example: automatic mode, semi-automatic mode or manual mode) to obtain a modified carbide. Referring again to FIGS. 1 and 2, for example, depending on the characteristics of the biological material 100, the predetermined pyrolysis temperature can be selected as 500°C, 700°C or 900°C, and the preliminary modified powder material can be selected to undergo high-temperature pyrolysis in an anaerobic environment (such as nitrogen or other gases), and the high-temperature pyrolysis of the preliminary modified powder material can select a predetermined heating rate (such as 5°C / min or other heating rates). Referring again to FIGS. 1 and 2, for example, the method for preparing the graphene-like structured biochar material of the preferred embodiment of the present invention includes step S6: Next, the modified carbide can be optionally washed and dried by appropriate technical means (such as automatic, semi-automatic or manual means) in order to obtain a graphene-like biochar material. Referring again to FIGS. 1 and 2, for example, the graphene-like biochar material can be optionally treated with an acidic material (such as hydrochloric acid or other substances) until its pH value is stable, and the graphene-like biochar material can be optionally placed in a vacuum oven device and dried at a predetermined temperature (such as 90°C or other temperatures) for a predetermined time (such as 24 hours or other times). FIGS. 3A and 3B disclose a transmission electron micrograph of the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the first type of graphene structure shown in the graphene layer and its lattice. Referring to FIGS. 3A and 3B, for example, the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the first type of graphene structure can be optionally made of water chestnut shells, and it has a graphene layer (as shown in FIG. 3A) and its graphene lattice (as shown in FIG. 3B). FIGS. 4A and 4B disclose a transmission electron micrograph of the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the second type of graphene structure shown in the graphene layer and its lattice. Referring to FIGS. 4A and 4B, for example, the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the second type of graphene structure can be optionally made of peanut shells (i.e., fruit shells), and it has a graphene layer (as shown in FIG. 4A) and its graphene lattice (as shown in FIG. 4B). FIGS. 5A and 5B disclose a transmission electron micrograph of the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the third type of graphene structure shown in the graphene layer and its lattice. Referring to FIGS. 5A and 5B, for example, the graphene-like structured biochar material of the preferred embodiment of the present invention selecting the third type of graphene structure can be optionally made of grapevine branches (i.e., hardwood), and it has a graphene layer (as shown in FIG. 5A) and its graphene lattice (as shown in FIG. 5B). Figures 6A and 6B disclose the selection of the fourth type of graphene structure of the graphene-like structure biochar material according to the preferred embodiment of the present invention, which is shown in the transmission electron micrograph of the graphene layer and its lattice. Referring to Figures 6A and 6B, for example, the fourth type of graphene structure selected for the graphene-like structure biochar material according to the preferred embodiment of the present invention can be made from Melia azedarach branches (i.e., hardwood), and it has a graphene layer (as shown in Figure 6A) and its graphene lattice (as shown in Figure 6B). Figures 7A and 7B disclose the selection of the fifth type of graphene structure of the graphene-like structure biochar material according to the preferred embodiment of the present invention, which is shown in the transmission electron micrograph of the graphene layer and its lattice. Referring to Figures 7A and 7B, for example, the fifth type of graphene structure selected for the graphene-like structure biochar material according to the preferred embodiment of the present invention can be made from Araucaria cunninghamii branches (i.e., softwood), and it has a graphene layer (as shown in Figure 7A) and its graphene lattice (as shown in Figure 7B). Figures 8A and 8B disclose the selection of the sixth type of graphene structure of the graphene-like structure biochar material according to the preferred embodiment of the present invention, which is shown in the transmission electron micrograph of the graphene layer and its lattice. Referring to Figures 8A and 8B, for example, the sixth type of graphene structure selected for the graphene-like structure biochar material according to the preferred embodiment of the present invention can be made from Podocarpus costalis branches (i.e., softwood), and it has a graphene layer (as shown in Figure 8A) and its graphene lattice (as shown in Figure 8B). Figures 9A and 9B disclose the selection of the seventh type of graphene structure of the graphene-like structure biochar material according to the preferred embodiment of the present invention, which is shown in the transmission electron micrograph of the graphene layer and its lattice. Referring to Figures 9A and 9B, for example, the seventh type of graphene structure selected for the graphene-like structure biochar material according to the preferred embodiment of the present invention can be made from rice straw (i.e., herb), and it has a graphene layer (as shown in Figure 9A) and its graphene lattice (as shown in Figure 9B). The above experimental data are the preliminary experimental results obtained under specific conditions, which are only used to facilitate the understanding or reference of the technical content of the present invention, and other relevant experiments still need to be carried out. The experimental data and its results are not used to limit the scope of the rights of the present invention. The foregoing preferred embodiments only illustrate the present invention and its technical features. The technology of this embodiment can still be appropriately implemented by various substantially equivalent modifications and / or replacement methods; therefore, the scope of the rights of the present invention shall be subject to the scope defined by the appended patent application scope. The copyright of this case is restricted for use in the patent application purpose of the Republic of China. 1: Graphene-like biochar material 10: Graphene-like structure 11: Graphene-like lattice 100: Biomaterials

Claims

1. A graphene-like biochar material, comprising: a graphene-like biochar material made from a biological material, wherein the biological material is ground to obtain a dried biological powder material, and the dried biological powder material is hydrothermally decomposed to obtain a hydrothermal carbonization precursor; and a graphene-like structure formed on a graphene-like layer, wherein the graphene-like layer is formed on the graphene-like biochar material, the biological material is ground to obtain a dried biological powder material, and the dried biological powder material is hydrothermally decomposed to obtain a hydrothermal carbonization precursor; The graphene structure of this type has a graphene lattice, and the graphene biochar material is made by a hydrothermal process, a modification process, and a high-temperature thermal decomposition process. A hydrothermal carbonization precursor and a modification material are in a predetermined ratio of 1:4 by weight. The modification material is selected from a strong base material or a material containing a strong base. The preliminary modified carbide is ground to obtain a preliminary modified powder material, and the preliminary modified powder material is subjected to high-temperature thermal decomposition to obtain a modified carbide. The predetermined decomposition temperature is 500°C or 700°C.

2. The biochar material with a graphene-like structure as described in claim 1, wherein the biomaterial is selected from agricultural waste biomaterial.

3. The biochar material with a graphene-like structure as described in claim 1, wherein the biomaterial is selected from a plant shell material, a herbaceous plant material, a woody plant material, or any combination thereof.

4. The biochar material with a graphene-like structure as described in claim 3, wherein the plant shell material is selected from a water chestnut shell material, a peanut shell material, or any combination thereof.

5. The biochar material with a graphene-like structure as described in claim 3, wherein the woody plant material comprises a softwood material and a hardwood material.

6. A method for preparing a biochar material with a graphene-like structure, comprising: performing a first grinding operation on a dried biomaterial to obtain a dried biopowder material; hydrothermally decomposing the dried biopowder material to obtain a hydrothermal carbonization precursor; mixing the hydrothermal carbonization precursor with a modifying material for surface modification to obtain a preliminary modified carbon, wherein the hydrothermal carbonization precursor and the modifying material have a predetermined ratio of 1:4 by weight, and the modifying material is selected from a strong alkali material or a material containing strong... The material is an alkaline substance; the pre-modified carbide is subjected to a second grinding operation to obtain a pre-modified powder material; the pre-modified powder material is subjected to high-temperature thermal pyrolysis at a predetermined pyrolysis temperature to obtain a modified carbide, and the predetermined pyrolysis temperature is 500°C or 700°C; and the modified carbide is washed and dried to obtain a type of graphene biochar material; wherein a type of graphene structure is formed on a type of graphene layer, and the type of graphene layer is formed on the type of graphene biochar material, and the type of graphene structure has a type of graphene lattice.

7. The method for preparing a biochar material with a graphene-like structure as described in claim 6, wherein the hydrothermal carbonization precursor is cooled to a room temperature value.

8. A method for preparing a graphene-like biochar material as described in claim 6, wherein the dried biomaterial is selected from an agricultural waste biomaterial.

9. A method for preparing a graphene-like biochar material as described in claim 6, wherein the pre-modified powder material is subjected to high-temperature pyrolysis in an oxygen-free environment.

10. A method for preparing a graphene-like biochar material as described in claim 6, wherein the graphene-like biochar material is treated until its pH value is stable.

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