KR102216039B1 - Manufacturing method of activated carbon - Google Patents

Abstract

The present invention relates to a method for producing activated carbon, and more specifically, preparing graphene oxide by a chemical exfoliation process using a carbon source and an acid; graphene oxide and remaining after the step of preparing the graphene oxide Separating graphene oxide and a residual carbon source from a crude product containing water; Putting the separated residual carbon source into a reactor, raising the temperature to 800° C. or higher; And maintaining the elevated temperature while supplying steam.

Description

Manufacturing method of activated carbon {MANUFACTURING METHOD OF ACTIVATED CARBON}

The present invention relates to a method of manufacturing activated carbon, and more specifically, a method of manufacturing activated carbon using an unreacted carbon source generated in the manufacturing process of graphene oxide.

Because graphene has excellent electrical and thermal conductivity, and transparent and flexible physical properties, graphene has begun to attract attention as a next-generation new material. Graphene uses mechanical exfoliation, epitaxial growth, graphite oxide, chemical vapor deposition, exfoliation using graphite intercalation compounds, and chemical exfoliation. It is being synthesized using. In particular, the chemical exfoliation method of oxidizing graphite, separating it in a solution, and reducing it, has the advantage of being able to hybridize with other materials due to the possibility of mass production and easy chemical modification.

Recently, a technology for producing graphene from coal using a chemical exfoliation method was improved from the existing Hummers method and introduced by Wu. Coal is an economical, abundant, and easily combustible energy source that is widely used worldwide and is mainly found in sedimentary rock formations. Coal is divided into grades from peat to lignite, sub-bituminous coal, bituminous coal, and anthracite. Among them, low-grade coal (LRC) refers to brown coal to sub-bituminous coal, and bituminous coal is classified as high-grade coal (HRC). Coal can be produced most easily and quickly because carbon produced through oxidation and carbonization reactions of organic matter deposits of plants and animals is produced at low pressures and temperatures. In addition, the structure of coal is more complex than graphite, which has been widely used as a carbon source for the production of graphene oxide. The structure of coal contains angstrom or nanometer-sized crystalline carbon domains with defects linked by aliphatic amorphous carbon. Because of this complex structure, the amorphous carbon in the coal structure is more easily migrated than graphite under the oxidizing conditions commonly used on the pure sp ² carbon structure. Coal is economically inexpensive compared to graphite, but is easy to peel, thereby improving the problem of acid impurities occurring in the oxidation process. Since coal basically does not have many graphene structures compared to graphite, the yield of graphene production is low, and a large amount of unreacted residual coal remains even after production. These residual coals are disposed of, and environmental pollution and cost loss are a problem.

Accordingly, the present invention is to provide a method of recycling residual coal generated in the graphene manufacturing process, and a method of recycling residual coal as a carbon source of activated carbon may be provided.

The present invention is to solve the above-described problem, and an object of the present invention is to provide a method of manufacturing activated carbon that can simplify the manufacturing process and increase productivity by recycling the residual carbon source generated in the manufacturing process of graphene oxide. To provide.

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, the present invention comprises the steps of preparing graphene oxide by a chemical exfoliation process using a carbon source and an acid; Separating the graphene oxide and the residual carbon source from the crude product including the graphene oxide and the residue after the step of preparing the graphene oxide; Putting the separated residual carbon source into a reactor and raising the temperature to 800° C. or higher; And maintaining the temperature of the raising of the temperature while supplying steam at the temperature of the raising of the temperature. It relates to a method for producing activated carbon.

According to an embodiment of the present invention, the step of raising the temperature may be raising the temperature at a temperature increase rate of 10° C./min or more on average.

According to an embodiment of the present invention, the steam may be supplied at 0.5 to 5 (mass ratio) with respect to the carbon source.

According to an embodiment of the present invention, the step of maintaining the temperature of the step of raising the temperature while supplying the steam may be maintained for at least 1 hour.

According to an embodiment of the present invention, the carbon source may include coal, coke, or both.

According to an embodiment of the present invention, the carbon source is anthracite, xanthan, bituminous coal, sub-bituminous coal, modified bituminous coal, asphaltene, asphalt, peat, lignite, peat, general coal, silicified oil, bone coal and sea coal. It may include at least one selected from the group consisting of.

According to an embodiment of the present invention, the acid may include at least one selected from the group consisting of sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid, fuming sulfuric acid, oleum, chlorosulfonic acid, p-luene sulfonic acid, and hypophosphorous acid.

According to an embodiment of the present invention, the step of preparing the graphene oxide may include: exposing a carbon source to an acid and an oxidizing agent to obtain a crude product including graphene oxide and a residue; .

According to an embodiment of the present invention, the step of obtaining the crude product may be performed by exposing a carbon source to an acid and an oxidizing agent at a temperature of 50° C. or higher to perform an oxidation process.

According to an embodiment of the present invention, the oxidizing agent may include at least one selected from the group consisting of potassium permanganate, sodium permanganate, hypophosphorous acid, nitric acid, sulfuric acid, hydrogen peroxide, nitric acid, and sodium nitrite.

According to an embodiment of the present invention, the separating the graphene oxide and the residual carbon source may include washing the crude product; Dispersing the washed crude product in distilled water and then adding a hydrophobic solution to prepare a distilled water-hydrophobic mixture; Separating the supernatant after ultrasonicating the mixed solution; And drying the supernatant to obtain a residual carbon source. It may be to include.

According to an embodiment of the present invention, the mixing ratio of the distilled water: the hydrophobic solution may be from 5:1 to 15:1.

According to an embodiment of the present invention, the washing of the crude product may include obtaining a diluent by adding an acid solution to the crude product; And obtaining a washed crude product by high-speed centrifugation of the diluted solution.

According to an embodiment of the present invention, the washing of the crude product may include diluting the crude product with an acid solution to obtain a first dilution solution; High-speed centrifugation of the first diluted solution to obtain a first washed crude product; Diluting the first washed crude product with distilled water to obtain a second diluted solution; And obtaining a second washed crude organism by high-speed centrifugation of the second diluted solution. Including, and the step of obtaining the second dilution liquid and the step of obtaining the second washed crude organisms may be repeated a plurality of times until the second dilution liquid reaches a pH of 6 to 9.

According to an embodiment of the present invention, the concentration of the acid solution may be 0.5 to 5 M.

According to an embodiment of the present invention, the step of obtaining the first dilution liquid and the step of obtaining the second dilution liquid may be performed at a temperature of room temperature to 70 °C.

According to an embodiment of the present invention, activated carbon having an iodine number of 400 mg/g or more may be obtained.

According to an embodiment of the present invention, it may be to obtain activated carbon having a specific surface area of 500 m ² /g to 1500 m ² /g and a micropore volume of 0.3 cm ³ /g to 0.8 cm ³ /g.

The present invention can provide a method of recycling the residual carbon source after the chemical exfoliation process of graphene oxide, which can increase the utilization of the carbon source to be disposed of, and reduce the waste treatment cost and environmental pollution.

The present invention simplifies the manufacturing process of activated carbon of porous activated carbon by applying the residual carbon source that has undergone an oxidation reaction in the chemical half-step process, and the activation process is well performed to provide high-quality porous activated carbon.

1 shows a process flow of a method for manufacturing activated carbon according to the present invention, according to an embodiment of the present invention.
Figure 2 shows a notarization flow of the method for producing activated carbon according to the present invention, according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms used in the present specification are terms used to properly express a preferred embodiment of the present invention, which may vary depending on the intention of users or operators, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the contents throughout the present specification. The same reference numerals in each drawing indicate the same members.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components.

Hereinafter, a method for producing activated carbon of the present invention will be described in detail with reference to Examples and drawings. However, the present invention is not limited to these examples and drawings.

The present invention relates to a method of manufacturing activated carbon, and according to an embodiment of the present invention, the manufacturing method comprises recycling the residual carbon source as a carbon source of activated carbon after the manufacturing process of graphene oxide to produce porous activated carbon. will be.

The residual carbon source refers to a carbon source that was used in a chemical exfoliation process for the production of graphene oxide, but has not been completely converted to graphene oxide, and is exposed to an acid and an oxidizing agent during the chemical exfoliation process, and undergoes an oxidation reaction. At least a portion may include all unreacted carbon sources with little and/or no exfoliation. In this specification, it is referred to generically as a residual carbon source or an unreacted carbon source.

According to an embodiment of the present invention, the manufacturing method will be described with reference to FIG. 1. 1 is an exemplary view showing a process flow of a method for manufacturing activated carbon according to the present invention according to an embodiment of the present invention. In FIG. 1, the manufacturing method includes the steps of preparing graphene oxide by a chemical peeling process ( 100); Separating the graphene oxide and the residual carbon source (200); And activating the residual carbon source (300).

Preparing graphene oxide by chemical exfoliation process (100 )

The step 100 of preparing graphene oxide by a chemical exfoliation process is a step of manufacturing graphene oxide by a chemical exfoliation process using a carbon source and an acid. For example, it may include the step of exposing a carbon source to an acid and an oxidizing agent to prepare graphene oxide, and obtaining a crude product including graphene oxide and a residue.

The carbon source may include coal, coke, or both. The coal is divided into grades from peat to lignite, sub-bituminous coal, bituminous coal, and anthracite, among which low-grade coal (LRC) refers to from brown coal to sub-bituminous coal, and from bituminous coal is classified as high-grade coal (HRC). In addition, the coke may be made of pitch, bituminous coal, or a combination thereof. The pitch is discharged as debris during the refining process of fossil fuels such as petroleum or coal, and has a viscous mixture form or a powder form including a plurality of polyaromatic hydrocarbons having a plurality of aromatic rings. I can take it.

For example, the carbon source is selected from the group consisting of anthracite, xanthan, bituminous coal, sub-bituminous coal, modified bituminous coal, asphaltene, asphalt, peat, lignite, peat, general coal, silicified oil, bone coal and sea coal. It may include at least one.

The acid is necessary to oxidize coal with an oxidizing agent, and is a substance that generates hydrogen ions and neutralizes with a base to form a salt. In order to prevent the acid and the oxidizing agent from rapidly reacting to generate excessive heat of reaction, a salt thereof (eg, sodium nitrate) may be additionally included in addition to these acids.

For example, the acid may include at least one selected from the group consisting of sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid, fuming sulfuric acid, oleum, chlorosulfonic acid, p-ruene sulfonic acid, and hypophosphorous acid.

The oxidizing agent includes at least one selected from the group consisting of potassium permanganate, sodium permanganate, hypophosphorous acid, nitric acid, sulfuric acid, hydrogen peroxide, nitric acid, and sodium nitrite, and the oxidizing agent may be in the form of a liquid medium.

The mixing ratio of the carbon source to the acid may be 50 to 150 (w/w), and the mixing ratio of the carbon source to the oxidizing agent may be 0.5 to 2 (w/w).

The exposure is a process for obtaining graphene oxide, and various methods may be used to expose a carbon source to an acid and an oxidizing agent. As a method for exposing, a method of exposing a carbon source, an acid and an oxidizing agent to a liquid solution, a method of ultrasonicating the carbon source in the presence of an acid and an oxidizing agent, a method of stirring the carbon source in the presence of an acid and an oxidizing agent, an acid and It may include, but is not limited to, a method of heating the carbon source in the presence of an oxidizing agent. Two or more acids and oxidants may be exposed to the carbon source in a sequential manner.

For example, the exposure may be at least 30° C. after mixing the carbon source, acid and oxidizing agent; 50° C. or higher; Or 50 ℃ to 100 ℃ temperature; at least 30 minutes; More than 1 hour; Alternatively, the oxidation process may be performed for 1 to 20 hours. It can be ultrasonicated during this mixing and oxidation process.

Separating the graphene oxide and the residual carbon source (200)

In the step of separating the graphene oxide and the residual carbon source 200, the graphene oxide in the crude product including the graphene oxide and the residue after the step 100 of preparing the graphene oxide by a chemical exfoliation process This is the step of separating the fin and the residual carbon source.

Referring to FIG. 2, FIG. 2 shows a process flow diagram according to an embodiment of the present invention. In FIG. 2, the step of separating the graphene oxide and the residual carbon source 200 includes cleaning the crude product. Step 210; Preparing a distilled water-hydrophobic mixture (220); Separating the supernatant (230); It may include; obtaining a source of residual carbon from the supernatant (240).

The step 210 of washing the crude product is a step of washing the crude product with an acid solution to remove impurities and obtaining a solid of the washed crude product. That is, adding an acid solution to the crude product to obtain a diluted solution (211a); And a step 212a of obtaining the washed crude product by high-speed centrifugation of the diluted solution.

The acid solution is for washing the residual acid waste solution, and the low concentration of hydrochloric acid lowers the pH to facilitate the removal of metal ions. The acid solution is a low-concentration acid solution such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, malic acid, and acetic acid, and preferably has a concentration of 1M or less.

The impurities may be acids, oxidizers, metal ions, nitrogen-based additives, and the like remaining after treatment with acids and oxidizing agents.

The high-speed centrifugation may have a minimum speed of 10,000 rpm or more and a maximum speed of 25,000 rpm or less.

As another example, in the step 210 of washing the crude product, impurities such as acids, oxidizing agents, and ions may be removed by washing with an acid solution and distilled water, and the pH of the washed crude product may be adjusted. For example, diluting the crude product with an acid solution to obtain a first diluted solution (211b); High-speed centrifugation of the first diluted solution to obtain a first washed crude product (212b); Diluting the first washed crude product with distilled water to obtain a second diluted solution (213b); And a step 214b of obtaining a second washed crude organism by high-speed centrifugation of the second diluted solution.

The step 213b of acquiring the second dilution liquid and the step 214b of acquiring the second washed crude organism may include a pH of 6 to 9; Alternatively, it is possible to adjust the pH of the washed crude product by repeating a plurality of times until the pH is 6 to 7, and increase the activity of the carbon source when producing activated carbon.

The step 211b of obtaining the first dilution liquid and the step 213b of obtaining the second dilution liquid may include: room temperature to 70° C.; The acid solution and distilled water may be added and stirred at a temperature of 30°C to 60°C or 40°C to 60°C. In the acid solution, the concentration of the acid solution may be a low concentration or 0.5 to 5 M.

The step of preparing a distilled water-hydrophobic mixture (220) is a step of preparing a distilled water-hydrophobic mixture by dispersing the washed crude product in distilled water and then adding a hydrophobic solution, the hydrophobic solution layer adsorbs the residual carbon source, and distilled water Since graphene oxide remains in the layer, the carbon source and graphene oxide can be separated.

The step of separating the supernatant (230) is a step of separating the supernatant after the mixture is subjected to ultrasonic treatment, and is calcined by separating the carbon source adsorbed on the surface and between the layers of graphene oxide through ultrasonic treatment. It is adsorbed effectively to the solvent layer, and the separation of the graphene oxide and the carbon source can be made easier. In addition, the carbon source and graphene oxide may be separated by phase separation through high-speed centrifugation after ultrasonic treatment.

In the ultrasonic treatment, the ultrasonic waves may be treated for 15 to 30 minutes. If the sonication is less than 15 minutes, the graphene oxide is not well dispersed, so it may be difficult to separate unreacted coal. If it exceeds 30 minutes, distilled water and a hydrophobic solution are mixed due to excessive sonication and phase separation. May have difficulty with Some precipitates generated after ultrasonic treatment may be removed, and a residual carbon source of the precipitate may be recovered.

The high-speed centrifugation may be performed at 10 to 20 minutes, 10,000 rpm to 20,000 rpm.

The hydrophobic solution is for phase separation with distilled water in the mixed solution and for phase separation by adsorbing a hydrophobic carbon source, and is not particularly limited, but is preferably a group consisting of a non-polar solvent, kerosene, light oil, vegetable oil, tallow and pork fat. It may include one selected from, and more preferably kerosene. The vegetable oil may be olive oil, sesame oil, perilla oil, soybean oil, palm oil, rapeseed oil, and the like. The non-polar solvent may be hexane, 　heptane, octane, decane, and cyclohexane.

The mixing ratio (w/w) of the distilled water to the hydrophobic solution is 5:1 to 15:1; 8:1 to 15:1; Or 10:1 to 15:1. When the mixing ratio of the distilled water is less than 5, the specific gravity of the hydrophobic solution becomes excessively high, so that phase separation may be difficult in the future, and when it is more than 15, the hydrophobic solution becomes too low. It can be degraded.

In the step 240 of obtaining a residual carbon source from the supernatant, the separated supernatant is evaporated, distilled under reduced pressure, vacuum drying, freeze drying, investment drying, hot air drying, spray drying, etc. A carbon source can be obtained.

The freeze drying is 0°C or less; Or drying at a temperature of -50°C to 0°C, except for 50°C or more; Or it can be dried at a temperature of 50 ℃ to 200 ℃. In addition, 1 hour or more; More than 5 hours; 1 to 40 hours; Alternatively, it may be dried for 1 to 5 hours.

The residual carbon source may be obtained as a fine powder using milling or a pulverizer. For example, using mechanical milling, the mechanical milling, at least one selected from the group consisting of rotor mill, mortar milling, ball milling, planetary ball milling, jet milling, bead milling, and atrition milling It may include.

The powder of the residual carbon source is 1 nm or more; 100 nm or more; 1 μm or more; Or it may have a size of 100 μm or more.

Activating the residual carbon source (300)

The step of activating the residual carbon source 300 is a step of obtaining activated carbon by separating the graphene oxide and the residual carbon source and activating the obtained residual carbon source in the step 200 of separating the carbon source. It can be converted to activated carbon through an activation process in. For example, adding a residual carbon source to the reactor and raising the temperature (310); And maintaining the elevated temperature (320).

In the step 310 of putting the residual carbon source into the reactor and raising the temperature, the residual carbon source is added to the reactor, and the reactor temperature is 800°C or higher; 800°C to 1500°C; Or 800°C to 1000°C, and the temperature increase rate is 10°C/min or more on average; Or it may be 10 ℃ / min to 20 ℃ / min. When included within the above temperature range, the specific surface area is large, micropores, etc. are well formed, the increase in particle size due to aggregation of activated carbon, etc. can be prevented, and activated carbon having excellent crystallinity can be provided.

The step of maintaining the elevated temperature 320 is an isothermal step of supplying steam at the elevated temperature and maintaining the temperature at a constant temperature for a certain period of time, for 1 hour or more; More than 2 hours; Alternatively, it can be maintained for 1 to 20 hours.

The steam is supplied at 0.5 to 5 (mass ratio) with respect to the carbon source, and steam alone or an inert gas such as nitrogen or argon having a steam content of 40% or more may be injected at 50 ml/min or more.

After the step 320 of maintaining the elevated temperature, it may be cooled by natural cooling or a cooling rate of 20° C./min or more.

The present invention relates to a porous activated carbon obtained by the method for producing activated carbon according to the present invention, and according to an embodiment of the present invention, the activated carbon recycles the residual carbon source after the chemical exfoliation process. The activation process can be performed without a carbonization process for, and the manufacturing process of activated carbon can be simplified and the manufacturing cost can be lowered, as well as increase the utilization of the residual carbon source and reduce the waste treatment cost. In addition, since a carbon source having a chemical exfoliation process in contact with an acid and an oxidizing agent is used, it is possible to provide a high-quality activated carbon that is well-activated and has well developed micropores.

According to an embodiment of the present invention, the activated carbon has mesopores and micropores, and the volume of the micropores may be larger. The volume of the micropores may be 0.3 cm ³ /g to 0.8 cm ³ /g, and the average size may be 0.6 nm to 1.5 nm. In addition, the activated carbon may have a specific surface area of 500 m ² /g to 1500 m ² /g, and an iodine number of 400 mg/g or more.

Hereinafter, the present invention will be described in more detail by examples and comparative examples.

However, the following examples are for illustrative purposes only, and the contents of the present invention are not limited to the following examples.

Example

7.5 g of coal as a carbon source, 360 mL of sulfuric acid (H ₂ SO ₄ ) as an acid, and 6 g of sodium nitrite (NaNo ₃ ) as an oxidizing agent were mixed. The oxidizing process of the coal was slowly mixed at room temperature for 24 hours and then heated to 80° C. for 6 hours. After diluting the oxidized coal with 1 L of 1M nitric acid (HNO ₃ ) solution, the heated solution was cooled to room temperature. The cooled oxidized coal solution was centrifuged at 13,000 rpm for 15 minutes. The centrifuged precipitate of the oxidized coal solution was filtered, and 400 mL of distilled water was added to the filtered precipitate, and the process of centrifuging at 13000 rpm was repeated until the pH reached 7. By separating the graphene oxide from the prepared graphene oxide solution centrifuged and dispersing in 50 mL of distilled water until the pH reached 7 by the above preparation example, 50 mL of graphene oxide solution was prepared. 5 mL of kerosene was added to the 50 mL graphene oxide solution, and sonicated with an ultrasonic stirrer for 20 minutes, and the precipitate (unreacted large coal particles) was separated. The mixed solution from which the precipitate was removed was centrifuged at 13000 rpm for 15 minutes. After the centrifugation, the resulting solid film of the upper layer and the lower solution containing graphene oxide were separated, respectively. The sediment separated by acid and the upper solid film phase-separated with kerosene were dried at 190 ^° C for 3 hours to obtain residual coal.

Activation process

The residual coal was put in a reaction furnace and the temperature was raised to 800° C. at 10° C./min, and the temperature was maintained while supplying steam (coal: steam = 1:1) at 800° C. for 1 hour. After cooling to room temperature, activated carbon was obtained.

The yield of activated carbon is 42.2%, and Iodine numver: 738 mg/g.

Comparative example

Coal (bituminous coal) was put in a reaction furnace and the temperature was raised to 800° C. at 10° C./min, and the temperature was maintained while supplying steam (coal: steam = 1:1) at 800° C. for 1 hour. After cooling to room temperature, activated carbon was obtained.

The yield of activated carbon is 58.87%, and Iodine numver: 343 mg/g.

The amount of nitrogen adsorption at 77K was measured based on the BET formula (a multi-molecular bed adsorption formula established by Brunauer, Emmett, and Teller in 1938), and the BET-surface area, pore volume, and average pore size were measured and shown in Table 1.

BET-surface area
(m ² /g) Pore volume
(cm ³ /g) Average pore size
(nm) Example 1 789 0.34 1.7 Comparative Example 1 496 0.18 1.6

Looking at Table 1, it can be seen that the activated carbon of Example 1 has an Iodine number of 738 mg/g, and the BET surface area is increased. Since this has a higher value than the Iodine number and BET compared to Comparative Example 1, it can be seen that the manufacturing method according to the present invention can provide activated carbon having excellent performance.

Although the embodiments have been described by the limited embodiments and drawings as described above, various modifications and variations can be made from the above description to those of ordinary skill in the art. For example, even if the described techniques are performed in a different order from the described method, and/or the described components are combined or combined in a form different from the described method, or are replaced or substituted by other components or equivalents. Appropriate results can be achieved. Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

Claims (19)

Preparing graphene oxide by a chemical exfoliation process using a carbon source and an acid;
Separating the graphene oxide and the residual carbon source from the crude product including the graphene oxide and the residue after the step of preparing the graphene oxide;
Putting the separated residual carbon source into a reactor and raising the temperature to 800° C. or higher; And
Maintaining the elevated temperature while supplying steam;
Containing,
Method for producing activated carbon.
The method of claim 1,
The step of raising the temperature is to increase the temperature at a temperature increase rate of 10 ℃ / min or more on average,
Method for producing activated carbon.
The method of claim 1,
The steam is supplied at 0.5 to 5 (mass ratio) with respect to the carbon source,
Method for producing activated carbon.
◈ Claim 4 was abandoned upon payment of the set registration fee. The method of claim 1,
The step of maintaining the temperature of the step of raising the temperature while supplying the steam is maintained for at least 1 hour,
Method for producing activated carbon.
◈ Claim 5 was abandoned upon payment of the set registration fee. The method of claim 1,
The carbon source is,
Which contains coal, coke or both,
Method for producing activated carbon.
◈ Claim 6 was abandoned upon payment of the set registration fee. The method of claim 1,
The carbon source is,
Anthracite, xanthan, bituminous coal, sub-bituminous coal, modified bituminous coal, asphaltene, asphalt, peat, lignite, peat, general coal, silicified oil, bone coal, and sea coal.
Method for producing activated carbon.
◈ Claim 7 was abandoned upon payment of the set registration fee. The method of claim 1,
The acid includes at least one selected from the group consisting of sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid, fuming sulfuric acid, oleum, chlorosulfonic acid, p-ruene sulfonic acid and hypophosphorous acid,
Method for producing activated carbon.
delete The method of claim 1,
The step of preparing the graphene oxide,
Exposing the carbon source to an acid and an oxidizing agent to obtain a crude product comprising graphene oxide and a residue;
It includes,
Method for producing activated carbon.
The method of claim 1,
The step of obtaining the crude product is that the oxidation process is performed by exposing the carbon source to an acid and an oxidizing agent at a temperature of 50° C. or higher,
Method for producing activated carbon.
◈ Claim 11 was abandoned upon payment of the set registration fee. The method of claim 9,
The oxidizing agent,
It comprises at least one selected from the group consisting of potassium permanganate, sodium permanganate, hypophosphorous acid, nitric acid, sulfuric acid, hydrogen peroxide, nitric acid, and sodium nitrite,
Method for producing activated carbon.
The method of claim 1,
The step of separating the graphene oxide and the residual carbon source,
Washing the crude product;
Dispersing the washed crude product in distilled water and then adding a hydrophobic solution to prepare a distilled water-hydrophobic mixture;
Separating the supernatant after ultrasonicating the mixed solution; And
Drying the supernatant to obtain a residual carbon source;
It includes,
Method for producing activated carbon.
◈ Claim 13 was abandoned upon payment of the set registration fee. The method of claim 12,
The mixing ratio of the distilled water:hydrophobic solution is 5:1 to 15:1,
The hydrophobic solution,
It includes at least one selected from the group consisting of kerosene, light oil, vegetable oil, tallow and pork fat,
Method for producing activated carbon.
The method of claim 1,
The step of washing the crude product,
Adding an acid solution to the crude product to obtain a diluted solution; And
High-speed centrifugation of the diluted solution to obtain a washed crude product;
It includes,
Method for producing activated carbon.
The method of claim 1,
The step of washing the crude product,
Diluting the crude product with an acid solution to obtain a first diluted solution;
High-speed centrifugation of the first diluted solution to obtain a first washed crude product;
Diluting the first washed crude product with distilled water to obtain a second diluted solution; And
Obtaining a second washed crude organism by high-speed centrifugation of the second diluted solution;
Including,
The step of obtaining the second dilution liquid and the step of obtaining the second cleaned crude organisms are repeated a plurality of times until the second dilution liquid becomes pH 6 to 9,
Method for producing activated carbon.
◈ Claim 16 was abandoned upon payment of the set registration fee. The method of claim 14,
The concentration of the acid solution is 0.5 to 5 M,
Method for producing activated carbon.
◈ Claim 17 was abandoned upon payment of the set registration fee. The method of claim 15,
The step of obtaining the first dilution liquid and the step of obtaining the second dilution liquid are carried out at a temperature of room temperature to 70 ℃,
Method for producing activated carbon.
The method of claim 1,
To obtain activated carbon with an iodine number of 400 mg/g or more,
Method for producing activated carbon.
The method of claim 1,
To obtain activated carbon, having a specific surface area of 500 m ² /g to 1000 m ² /g and a fine pore volume of 0.3 cm ³ /g to 0.8 cm ³ /g,
Method for producing activated carbon.

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