Method for manufacturing porous biochar materials

Abstract

This invention provides a method for producing porous biochar material that allows for the production of porous biochar material through a simple process and yields reduced iron as a by-product. [Solution] A method for producing a porous biochar material, characterized by comprising: a material stacking step in which a material stack is formed in which a biocarbon source and iron oxide are stacked from bottom to top; and a heat treatment step in which the material stack is heat-treated to reduce the iron oxide, and the carbon dioxide generated by the reduction reaction reacts with the biocarbon source to form pores.

Description

Technical Field

[0001] The present invention relates to a method for producing a porous biochar material, and particularly to a method for producing a porous biochar material that can simultaneously produce reduced iron.

Background Art

[0002] Porous biochar materials are widely used in the field of electrochemistry and can be used, for example, as electrodes for lithium-ion batteries, lithium-ion capacitors or supercapacitors.

[0003] In the conventional method for producing porous biochar, it is produced by combining oil and a template through thermochemical treatment of biomass. However, an activator is required for the template method, and multiple heating and cooling treatments are required in the process, resulting in a complex manufacturing process, high equipment and production costs.

Summary of the Invention

[0004] Therefore, the problem to be solved by the present invention is to provide a method for producing a porous biochar material that can be produced in a simple process, obtain reduced iron as a by-product, simplify the manufacturing process of the porous biochar material, and enhance the economic effect.

[0005] To solve the conventional technical problems, the present invention provides a method for producing a porous biochar material, characterized by including a material stacking step in which a material stack is formed by stacking a biochar source and iron oxide from bottom to top, and a heat treatment step in which the material stack is heat-treated, the iron oxide is reduced, and carbon dioxide generated by the reduction reaction reacts with the biochar source to form pores.

[0006] In one embodiment of the present invention, in the material stacking step, calcium carbonate is further included, and a material stack is formed by stacking the calcium carbonate, the biochar source and the iron oxide from bottom to top.

[0007] One embodiment of the present invention provides a method for producing a porous biochar material, characterized in that the biocarbon source is glucose or lignin.

[0008] In the method for producing porous biochar material of the present invention, the biocarbon source is not particularly limited as long as it is biomass, and biomass containing carbon from glucose or lignin can be used. Among these, glucose or lignin are particularly suitable as biocarbon sources.

[0009] In one embodiment of the present invention, a method for producing a porous biochar material is provided, characterized in that the carbon content of the biocarbon source in the material stacking step is 40% to 90%.

[0010] One embodiment of the present invention provides a method for producing a porous biochar material characterized in that the particle size of the iron oxide is 1 μm to 100 μm.

[0011] One embodiment of the present invention provides a method for producing a porous biochar material characterized in that the weight ratio of iron oxide to the biocarbon source is 1:9 to 9:1.

[0012] One embodiment of the present invention provides a method for producing a porous biochar material, characterized in that the heat treatment temperature is 700°C to 1000°C.

[0013] In one embodiment of the present invention, a method for producing a porous biochar material is provided, characterized in that, after the heat treatment, the porous biochar material is further pickled with acid and then washed with water to remove inorganic substances contained in the porous biochar material. [Effects of the Invention]

[0014] The present invention enables the production of porous biochar materials through a simple process, and reduces iron can be obtained as a by-product, thereby simplifying the production process of porous biochar materials and increasing economic efficiency. [Brief explanation of the drawing]

[0015] [Figure 1] This is a flow chart of a method for producing a porous biochar material according to an embodiment of the present invention. [Modes for carrying out the invention]

[0016] The embodiments of the present invention will be described below with reference to Figure 1. This description is merely an example of one embodiment of the present invention and does not limit the embodiments of the present invention.

[0017] As shown in Figure 1, the method for producing a porous biochar material according to an embodiment of the present invention includes a material stacking step S1 in which a material stack is formed in which a biocarbon source and iron oxide are stacked from bottom to top, and a heat treatment step S2 in which the material stack is heat-treated to reduce the iron oxide, and the carbon dioxide generated by the reduction reaction reacts with the biocarbon source to form pores.

[0018] According to the technical means of the present invention, carbon monoxide and volatile substances generated when a biocarbon source is heated undergo a reduction reaction with iron oxide, thereby obtaining reduced iron powder and carbon dioxide. The carbon dioxide obtained by the above reaction reacts with the biocarbon source to generate pores, thereby obtaining a porous biocarbon material with a high surface area.

[0019] The aforementioned reduction reaction can reduce 5-95% of the iron oxide used as a raw material to micron-level reduced iron powder.

[0020] In a method for producing a porous biocarbon material according to one embodiment of the present invention, calcium carbonate is further included in the material stacking step S1, and a material stack is formed in which the calcium carbonate, the biocarbon source and the iron oxide are stacked from bottom to top.

[0021] According to the technical means of the present invention, when calcium carbonate is added to the material stack, the calcium carbonate receives heat to generate carbon dioxide, and further reacts with the bio-carbon source to form pores, thereby obtaining a porous bio-carbon material having a higher surface area.

[0022] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, the bio-carbon source is glucose or lignin.

[0023] In the manufacturing method of the porous bio-carbon material of the present invention, the bio-carbon source is not particularly limited as long as it is biomass, and biomass containing carbon such as glucose and lignin can be used. Among them, glucose or lignin is suitable as a bio-carbon source because of its low cost and ability to improve the quality of the porous bio-carbon material of the product.

[0024] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, the carbon content of the bio-carbon source is 40% - 90%.

[0025] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, the particle diameter of the iron oxide is 1μm - 100μm.

[0026] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, the weight ratio of the iron oxide to the bio-carbon source is 1:9 - 9:1.

[0027] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, the temperature of the heat treatment is 700°C - 1000°C.

[0028] In the manufacturing method of the porous bio-carbon material according to one embodiment of the present invention, after the heat treatment, pickling is further performed on the porous bio-carbon material, and then washing with water is performed, so that a washing step for removing inorganic substances contained in the porous carbon material is included.

[0029] (Example 1) Table 1 shows the results of weighing the reduced iron and porous biochar materials after removing them from the container. The materials were stacked from bottom to top by 10.0 g of oyster shell powder, 12.0 g of biocarbon source powder, and 16.0 g of iron oxide powder. The materials were placed in a ceramic crucible and heated from room temperature at a heating rate of 5°C / min to 900°C, and maintained at 900°C for 2 hours.

[0030] [Table 1]

[0031] As can be seen from Table 1, the reduction rate of iron was 96%, and the yield of porous biochar material was 42%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 670 m². 2 It is / g.

[0032] (Example 2) Table 2 shows the results of weighing the reduced iron and porous biochar materials extracted from the resulting product. 500g of oyster shell powder, 600g of biocarbon source powder, and 650g of iron oxide powder were stacked from bottom to top to form a material stack. The material stack was placed in a ceramic crucible and heated from room temperature at a heating rate of 3°C / min to 850°C, and maintained at 850°C for 8 hours.

[0033] [Table 2]

[0034] As can be seen from Table 1, the reduction rate of iron was 59%, and the yield of porous biochar material was 50%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 570 m². 2 It is / g.

[0035] (Example 3) Table 3 shows the results of a material stacking experiment where 300g of biocarbon source powder and 450g of iron oxide powder were stacked from bottom to top, the material stack was placed in a ceramic crucible, heated from room temperature at a heating rate of 3°C / min to 850°C, and maintained at 850°C for 8 hours, and then the reduced iron and porous biocarbon materials were extracted and weighed.

[0036] [Table 3]

[0037] As can be seen from Table 3, the reduction rate of iron was 91%, and the yield of porous biochar material was 37%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 1044.8 m². 2 It is / g.

[0038] (Example 4) Table 4 shows the results of a material stacking experiment where 40g of wood pellets and 45g of iron oxide powder were stacked from bottom to top, the material stack was placed in a ceramic crucible, heated from room temperature at a heating rate of 5°C / min to 900°C, and maintained at 900°C for 2 hours, and then the reduced iron and porous biochar materials were extracted and weighed.

[0039] [Table 4]

[0040] As can be seen from Table 4, the reduction rate of iron was 9%, and the yield of porous biochar material was 9%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 2000 m². 2 It is / g.

[0041] (Example 5) Table 5 shows the results of a material stacking experiment. The experiment involved stacking 210g of orchid flower material and 315g of iron oxide powder from bottom to top, placing the material stack in a ceramic crucible, heating it from room temperature at a rate of 3°C / min to 850°C, and maintaining the temperature at 850°C for 24 hours. The reduced iron and porous biochar materials were then extracted and weighed.

[0042] [Table 5]

[0043] As can be seen from Table 5, the reduction rate of iron was 56%, and the yield of porous biochar material was 43%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 586 m². 2 It is / g.

[0044] (Example 6) Table 6 shows the results of a material stacking experiment where 200g of coffee grounds and 200g of iron oxide powder were stacked from bottom to top to form a material stack, placed in a ceramic crucible, heated from room temperature at a heating rate of 3°C / min to 850°C, and maintained at 850°C for 24 hours, after which the reduced iron and porous biochar materials were extracted and weighed.

[0045] [Table 6]

[0046] As can be seen from Table 6, the reduction rate of iron was 77%, and the yield of porous biochar material was 2.4%. The obtained porous biochar material was acid-washed with hydrochloric acid to remove impurities, and then neutralized by washing with water. After drying the sample, the surface area was measured by nitrogen adsorption and desorption. As a result of the measurement, the surface area of ​​the porous biochar material was 1240 m². 2 It is / g.

[0047] The present invention provides a method for producing porous biochar materials that allows for the production of porous biochar materials in a simple process, and also allows for the acquisition of reduced iron as a by-product, thereby simplifying the production process of porous biochar materials and enhancing economic efficiency.

[0048] While preferred embodiments of the present invention have been disclosed above, these do not limit the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, the claims of the present invention should be interpreted broadly to include such changes and modifications. [Explanation of Symbols]

[0049] S1 Material stacking process S2 Heat treatment process a

Claims

1. A material stacking process in which a material stack is formed in which a biocarbon source and iron oxide are stacked from bottom to top, A heat treatment step is performed on the material stack to reduce the iron oxide, and the carbon dioxide generated by the reduction reaction reacts with the biocarbon source to form pores. A method for producing a porous biochar material characterized by containing [a specific substance].

2. The method for producing a porous biocarbon material according to claim 1, characterized in that, in the material stacking step, calcium carbonate is further included, and a material stack is formed in which the calcium carbonate, the biocarbon source and the iron oxide are stacked from bottom to top.

3. The method for producing a porous biochar material according to claim 1, characterized in that the biocarbon source is glucose or lignin.

4. The method for producing a porous biocarbon material according to claim 1, characterized in that, in the material stacking step, the carbon content of the biocarbon source is 40% to 90%.

5. The method for producing a porous biochar material according to claim 1, characterized in that the particle size of the iron oxide is 1 μm to 100 μm.

6. The method for producing a porous biochar material according to claim 1, characterized in that the weight ratio of iron oxide to the biocarbon source is 1:9 to 9:

1.

7. The method for producing a porous biochar material according to claim 1, characterized in that the temperature of the heat treatment is 700°C to 1000°C.

8. The method for producing a porous biochar material according to claim 1, characterized in that, after the heat treatment, the porous biochar material is further pickled with acid and then washed with water to remove inorganic substances contained in the porous biochar material.

9. The specific surface area of ​​the porous biochar material is 400 to 2000 m². ２ A method for producing a porous biochar material according to claim 1, characterized in that the amount is / g.

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