KR101927177B1 - Method for manufacturing activated carbon - Google Patents

Abstract

The present invention relates to a method for producing activated carbon, which comprises: preparing an activated carbon precursor; Mixing the activated carbon precursor and the nitrogen compound to prepare a mixture; And heat treating the mixture to carbonize and activate it.

Description

[0001] METHOD FOR MANUFACTURING ACTIVATED CARBON [0002]

And a method for producing activated carbon.

Interest in eco-friendly cars is rapidly increasing due to problems such as depletion of fossil fuels and emission of greenhouse gases. Among eco-friendly cars, the distance traveled by electric cars is becoming an important issue.

Unlike an internal combustion engine vehicle, an electric vehicle does not have a waste heat source for heating (engine cooling water) and an engine for compressing refrigerant. As a result, a PTC heater (positive temperature coefficient heater) and a refrigerant compression power are separately required, and additional power is consumed. Accordingly, there is a problem that the travel distance is reduced by 30 to 50%.

Therefore, it is necessary to minimize the introduction of outside air in order to conserve the cooler. In this case, the CO2 concentration in the vehicle gradually increases due to the carbon dioxide emitted by the occupant (causing drowsiness of 2,000 ppm or more, difficulty breathing more than 5,000 ppm).

Therefore, research for reducing carbon dioxide in the vehicle continues. Currently, air filters (activated carbon) are being applied to some luxury vehicles. However, they can remove harmful gases such as volatile organic compounds (VOC) or fine dusts, but they can not remove carbon dioxide.

   In addition, the conventional activated carbon manufacturing method is a method in which a variety of vegetable raw materials such as coconut shells and coconut shells are subjected to a high temperature heat treatment in an inert atmosphere using a precursor, followed by carbonization, and then subjected to a high temperature chemical or physical activation process, Lt; RTI ID = 0.0 > expression. ≪ / RTI > However, this method has a problem that the pore size of the prepared activated carbon surface is wide ranging from micropores to atmospheric air, and the uniformity of the pores is poor, and it is difficult to express ultrafine pores at a level of 1 nm or less.

Therefore, research for improving the adsorption ability of carbon dioxide is urgent.

An embodiment of the present invention is to provide a method for producing activated carbon having improved selective adsorption capability of carbon dioxide through the introduction of a large amount of micropores and introduction of a nitrogen-based functional group.

According to an embodiment of the present invention, there is provided a method of preparing activated carbon, comprising: preparing an activated carbon precursor; Mixing the activated carbon precursor and the nitrogen compound to prepare a mixture; And heat treating the mixture to carbonize and activate it.

The activated carbon precursor may include nitrogen.

The activated carbon precursor may comprise chitosan, polypyrrole, or melamine.

After the step of preparing the activated carbon precursor, it may further comprise a smoothing step of pulverizing the activated carbon precursor.

The uniforming step is performed using a ball mill, and the ball used for the ball mill may have a particle diameter of 1 mm to 20 mm.

For an active carbon precursor and a total volume of 100 vol.% Of the ball used in the ball mill, the volume of the activated carbon precursor may be from 0.1 vol.% To 40 vol.%.

The processing speed of the ball mill may be from 100 rpm to 500 rpm.

The ball mill treatment time can be from 30 minutes to 5 hours.

The nitrogen compound may include monoethanolamine (MEA), diethanolamine (DEA), triethanolamine, polyethylenediamine, or ethylenediamine.

5 to 200 parts by weight of the nitrogen compound may be mixed with 100 parts by weight of the active precursor.

The step of mixing the activated carbon precursor and the nitrogen compound to prepare a mixture may be wet-mixed in the presence of a solvent, and the solvent may be a solvent having a hydroxyl group.

The step of carbonizing and activating the mixture by heat treatment may include a carbonization step in which the mixture is heat-treated under an inert gas and an activation step in which the carbonized mixture is heat-treated under a carbon dioxide and steam mixture gas.

The carbonization step can be carried out at a temperature of 700 ° C to 1000 ° C.

In the activation step, the mixed gas may comprise 10 to 50% by volume of carbon dioxide and 50 to 90% by volume of steam.

The activation step can be performed at a temperature of 700 ° C to 1000 ° C or less.

The activation step can be carried out by injecting the mixed gas to the activated carbon precursor at a rate of 1 ml / h to 100 ml / h.

The activation step can be carried out under a pressure of 5 bar or less.

The activation step can be carried out for 1 to 5 hours.

One embodiment of the present invention can provide an activated carbon having improved selective adsorption ability of carbon dioxide and a method for producing the same.

1 is a schematic flow diagram of a method for producing activated carbon according to an embodiment of the present invention.
2 is a scanning electron microscope (SEM) photograph of the activated carbon prepared in Example 1. Fig.
3 is a scanning electron microscope (SEM) photograph of the activated carbon prepared in Example 1. Fig.
Fig. 4 shows the results of specific surface area (BET) measurement for the activated carbon prepared in Examples 1 and 2 and Comparative Example.
FIG. 5 shows the results of pore size distribution analysis for the activated carbon prepared in Examples 1 and 2. FIG.
6 is a graph showing pore size distributions of the activated carbon prepared in Examples 1 and 2. FIG.
FIG. 7 shows X-ray diffraction (XPS) analysis results for the activated carbon prepared in Examples 1 and 2 and Comparative Examples. FIG.
Fig. 8 shows the carbon dioxide adsorption ability of the activated carbon prepared in Examples 1 and 2.

Hereinafter, embodiments of the present invention will be described in detail. However, it should be understood that the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

Throughout this specification, an ultramicropore means a pore having a diameter of 1 nm or less. Also, a micropore means a pore having a diameter of 2 nm or less. Mesopores are pores having a diameter of more than 2 nm and less than 50 nm.

As described above, the conventional activated carbon has a problem that the surface pore size is wide ranging from the micropores to the atmospheric air and the uniformity of the pores is poor, and the expression of ultrafine pores at a level of 1 nm or less is difficult.

Accordingly, it is an object of the present invention to provide a method for producing active carbon having a remarkably enhanced carbon dioxide adsorbing ability by introducing a base active site on the activated carbon surface, while exhibiting a large amount of ultra-fine holes.

FIG. 1 shows a schematic flow chart of a method for producing activated carbon according to an embodiment of the present invention. The flow diagram of the method for producing activated carbon of FIG. 1 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the production method of activated carbon can be variously modified.

As shown in Fig. 1, the method for producing activated carbon includes the steps of preparing an activated carbon precursor (S10); Mixing the activated carbon precursor and the nitrogen compound to prepare a mixture (S20); And a step (S30) of carbonizing and activating the mixture by heat treatment.

In one embodiment of the present invention, a large amount of ultrahigh-intensity ball is expressed, and at the same time, nitrogen-based functional groups are introduced on the activated carbon surface to produce active carbon having remarkably improved carbon dioxide adsorbing ability.

In addition, in an embodiment of the present invention, carbonization and activation can be performed in a continuous process, thereby improving the efficiency of the process.

In addition, in one embodiment of the present invention, by activating the activated carbon precursor (carbon dioxide-steam activation) using a mixed gas containing carbon dioxide and steam, the activity of the steam molecules is increased, and ultrafine It is possible to increase the expression of pores. Accordingly, the specific surface area and the uniformity of the pores of the activated carbon can be increased.

Hereinafter, each step of the production method and the produced activated carbon will be described in detail.

In step (S10) of preparing an activated carbon precursor, the activated carbon precursor may be one comprising starch, coconut bloom, citrus peel, orange bloom, coffee grounds, bamboo stalks, or combinations thereof. However, the present invention is not limited thereto, and various kinds of substance-based materials available as active carbon precursors can be used. By using such an inexpensive material-based material as a precursor, it is possible to manufacture low-cost activated carbon.

The active carbon precursor may also be a polyvinylidene-based polymer. Specific examples of the polymer include poly (vinylidene fluoride), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride- Poly (vinylidene chloride-co-acrylonitrile), poly (vinylidene chloride-co-acrylonitrile-co-methyl poly (vinylidene chloride-co-vinyl chloride)] and poly (vinylidene chloride-co-methyl [poly (vinylidene chloride-co-methyl acrylate) acrylate]) can be used.

In particular, in one embodiment of the present invention, it is also possible to use an activated carbon precursor containing nitrogen in step S10 to introduce a larger amount of nitrogen-based functional groups. Specifically, it may include chitosan, polypyrrole, or melamine.

After step S10, the step of smoothing the activated carbon precursor may further comprise a smoothing step.

The ball and the ball mill used in the ball mill may be made of SUS or zirconium (ZrO ₂ ). The ball mill and the ball mill used in the ball mill may be made of SUS, However, the present invention is not limited thereto.

The ball used for the ball mill may have a particle diameter of 1 mm to 20 mm. When the size of the ball is too small, the yield is rapidly reduced, and the relative content of impurities in the particles may increase. On the other hand, if the size is too large, large-sized particles are mainly generated, and the problem of the effect of the ball mill may be deteriorated.

For an active carbon precursor and a total volume of 100 vol.% Of the ball used in the ball mill, the volume of the activated carbon precursor may be between 0.1 vol.% And 40 vol.%. More specifically 10% by volume to 30% by volume. If the volume of the precursor is too large as compared with the volume of the ball, the effect of the ball mill may be deteriorated. On the other hand, if the volume of the precursor is too small, there may arise a problem of reduction of yield due to increase of heat generation during ball milling.

The processing speed of the ball mill may be 100 rpm to 500 rpm. If the ball mill processing speed is too high, overheating problems in the reaction vessel may occur. On the other hand, if the ball mill processing speed is too slow, the problem of ineffectiveness due to the reduction of the ball mill effect may occur.

The ball mill treatment time can be from 30 minutes to 5 hours. If the ball mill treatment time is too long, overall yield reduction and overall reduction in particle size may occur. On the other hand, if the ball mill treatment time is too short, a problem due to the reduction of the ball mill effect may occur.

After the homogenization by the ball mill treatment as described above, the step may further include washing the precursor through the acid to remove the impurities. Here, the acid may include, but is not limited to, hydrochloric acid, nitric acid, or sulfuric acid.

In addition, the method may further include a step of sorting the precursors by filtering the homogenized activated carbon precursor with a sieve having a size of 100 mu m to 250 mu m after the homogenization and pickling. As a result, it is possible to produce activated carbon having uniform particle size, high specific surface area and elimination of impurities. The uniformity of particle size of activated carbon can be an important problem in the processing of activated carbon for practical application. For example, when activated carbon is used for a water purifier filter, a car air-conditioner filter, or a supercapacitor electrode, it is mixed with a binder and transformed into a pellet or granular shape. If the particle size is not uniform, the performance may be deteriorated. When precursors are sieved by a sieve having a size of 100 mu m to 250 mu m as described above, it is possible to obtain a uniformity suitable for use in automotive air conditioner filters and the like.

Referring again to FIG. 1, in step S20, an activated carbon precursor and a nitrogen compound are mixed to prepare a mixture.

In one embodiment of the present invention, the activated carbon precursor and the nitrogen compound are mixed for introduction of the nitrogen-based functional group before the carbonization or activation step. The process is not interrupted in step S30, which will be described later, due to step S20, and can be performed in a continuous process, thereby improving the efficiency of the process. Also, in one embodiment of the present invention, a nitrogen-based functional group is introduced on the surface of activated carbon, and this nitrogen-based functional group acts as an active point for adsorbing carbon dioxide.

The nitrogen compound may be an amine compound, a polypyrrole, a poly (vinylidene chloride-co-acrylonitrile), a poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-acrylonitrile-co-methyl methacrylate), or a combination thereof. Specifically, an amine compound may be used. Monoethanolamine (MEA), diethanolamine (DEA), triethanolamine, polyethylenediamine, or ethylenediamine may be used.

5 to 200 parts by weight of a nitrogen compound may be mixed with 100 parts by weight of the active precursor. When the amount of the nitrogen compound is too small, the amount of the nitrogen-based functional group is decreased, and the ability to absorb carbon dioxide may not be sufficient. If the amount of the nitrogen compound is too large, it may interfere with the expression of micropores in the step S30 to be described later. Therefore, the mixing amount of the nitrogen compound can be controlled within the above-mentioned range.

Step S20 is possible either dry or wet. Dry means mixing an active carbon precursor with a nitrogen compound in air without adding any solvent, and wet means mixing an active carbon precursor with a nitrogen compound in a solvent. A wet method can be used for uniform mixing. In the case of the wet process, the solvent may be a compound having a hydroxyl group (-OH). Specifically ethanol, ethylene glycol, diethylene glycol, polyethylene glycol, 1,2-propanediol, dodecanediol, or combinations thereof. When a wet process is used, a drying process for removing the solvent may be added.

Returning again to FIG. 1, step S30 carries out heat treatment of the mixture to carbonize and activate it.

As described above, the process is not stopped in step S30 due to the step S20, and carbonization and activation can be performed in a continuous process, thereby improving the efficiency of the process.

That is, step S30 is divided into a carbonization step in which the mixture is heat-treated under an inert gas and an activation step in which the carbonized mixture is heat-treated under a carbon dioxide and steam mixture gas. The carbonization step and the activation step can be carried out without interruption while the atmosphere gas is being replaced, and can be carried out in a continuous process.

First, the carbonization step is explained. The mixture is heat-treated under an inert gas to carbonize the mixture.

As the inert gas, an inert gas generally known can be used without limitation. Specifically, it may include nitrogen (N ₂ ) or argon (Ar), but is not limited thereto.

The heat treatment temperature in the carbonization step may be 700 ° C to 1000 ° C. If the temperature is too low, carbonization may not be completely achieved. It is not necessary to carry out the heat treatment at a higher temperature because carbonization is sufficiently carried out at a temperature of 700 ° C to 1000 ° C. If the temperature is too high, an unnecessary expense may occur and a problem may arise that the rate of carbonization is reduced.

Next, the activation step will be described. The mixed gas containing carbon dioxide and steam is introduced into the carbonized mixture and activated by heat treatment.

At this time, by activating the activated carbon precursor (carbon dioxide-steam activation) using a mixed gas containing carbon dioxide and steam, the activity of the steam molecules is increased to selectively increase the expression of ultrafine pores having a diameter of 1 nm or less on the surface of the carbon . Accordingly, the specific surface area and the uniformity of the pores of the activated carbon can be increased.

Specifically, the conventional activated carbon has a microporosity of 50 to 70% at a diameter of 2 nm and a large amount of mesopores at a level of 2 to 50 nm (30 to 50%), . However, through the oxidizer-steam activation as described above, ultrafine pores having a level of 1 nm or less can be expressed in a large amount.

More specifically, ultrafine-strength balls having a diameter of 1.0 nm or less can be formed on the activated carbon surface through the above-described activation, as described in the following examples. More specifically greater than 0 nm and less than 1.0 nm; Greater than 0.3 nm, and less than or equal to 1.0 nm; More than 0.3 nm, not more than 0.6 nm; 0.6 nm or less; Greater than 0 nm, and less than 0.6 nm; 0.75 nm or less; Greater than 0.3 nm, and 0.75 nm or less; Or greater than 0 nm, and 0.75 nm or less; Lt; / RTI > In this case, the total pore volume of the surface of the activated carbon may be 0.1 cm ³ / g to 0.7 cm ³ / g, and the pore volume of the ultrafine pores may be 0.1 cm ³ / g to 0.5 cm ³ / g. Further, the volume of the ultrafine pores may be from 67% by volume to 83% by volume with respect to 100% by volume of the pore volume of the activated carbon surface. The specific surface area can be greatly improved by the porosity of the high ultrafine pores. Specifically, the BET specific surface area of the activated carbon may be more than 350 m ² / g. More specifically, it may be a 350m ² / g to 1000 m ² / g.

For a total volume of 100 vol.% Of the gas mixture, the volume of carbon dioxide may be between 10 vol.% And 50 vol.%. As the ratio of carbon dioxide increases, the introduction ratio of oxygen functional groups to the surface of the precursor and the increase of the specific surface area due to the micropore development are shown. However, if the ratio of carbon dioxide is too high, the ratio of micropores may be reduced, resulting in a reduction of the specific surface area and a decrease of the yield.

The activation step may be performed at a temperature of 700 ° C to 1000 ° C. The activation effect is not good at too low a temperature, and a rapid yield drop may occur at a too high temperature.

The activation step can be carried out by introducing the activated carbon precursor into the furnace, then injecting the mixed gas of carbon dioxide and steam. At this time, the pressure in the furnace can be adjusted to more than 0 bar to 5 bar by injecting a mixed gas of carbon dioxide and steam at a rate of 1 ml / h to 100 ml / h into the furnace into which the activated carbon precursor is introduced. More preferably from 2 bar to 5 bar. If the pressure in the furnace is too low, the activation effect may be reduced. On the other hand, when the pressure in the furnace is too high, there may arise a problem that the specific surface area is reduced due to remarkable breakdown of the micropores and development of the micropores. Further, there is a problem that the carbonization yield decreases sharply as the pressure increases.

The activation step may be performed for a time of 1 hour to 5 hours or less. If the activation time is too long, the problem of the yield and the problem of collapsing the pore structure of the entire material may occur. On the other hand, if it is too short, there is a problem that the activation effect is insufficient.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the present invention is not limited to the following examples.

Example  One : Chitosan / EDA - steam - CO ₂

Chitosan was prepared as an activated carbon precursor. The chitosan was milled using a ball mill, washed sequentially with 1 M hydrochloric acid solution, and dried in a vacuum oven. At the time of ball mill grinding, zirconia balls having a diameter of 5 mm and a diameter of 10 mm were mixed (5 mm: 10 mm = 30 volume%: 70 vol%) and pulverized at 360 rpm for 1 hour. In addition, the volume of the chitosan was set to 30% by volume based on 100% by volume of the total volume of the balls used for the activated carbon precursor and the ball mill.

The ground chitosan was washed sequentially with 1 M hydrochloric acid solution and ethanol, and dried in a vacuum oven. To 2 g of the chitosan powder was added ethanol / distilled water 1: 1 (v: v) as a solvent, and 5 mL of ethylenediamine (EDA) was slowly added dropwise while stirring and then heat treated in a vacuum oven at 60 캜 to obtain a white solid mixture .

The mixture was heated into a tubular furnace under a N ₂ atmosphere at a heating rate of 2 ℃ / min up to 900 ℃ was maintained for 90 minutes. N ₂ is stopped, CO ₂ is added at 50 cc / min, distilled water is injected at a rate of 6 ml / h, and the pressure in the furnace is maintained at 2 bar for 1 hour. After washing twice with 0.1 M hydrochloric acid solution and distilled water, the activated carbon was completely dried at 120 ° C for more than 12 hours.

SEM photographs of the prepared activated carbon are shown in FIGS. 2 and 3. FIG.

Example  2 : Chitosan / EDA - steam

The procedure for obtaining the mixture was the same as in Example 1

The mixture was heated into a tubular furnace under a N ₂ atmosphere at a heating rate of 2 ℃ / min up to 900 ℃ was maintained for 90 minutes. N ₂ is stopped, and CO ₂ is injected at a rate of 6 ml / h, and the pressure in the furnace is maintained at 2 bar for 1 hour. After washing twice with 0.1 M hydrochloric acid solution and distilled water, the activated carbon was completely dried at 120 ° C for more than 12 hours.

Comparative Example  One : Chitosan

Chitosan was prepared as an activated carbon precursor. The chitosan was milled using a ball mill, washed sequentially with 1 M hydrochloric acid solution, and dried in a vacuum oven. At the time of ball mill grinding, zirconia balls having a diameter of 5 mm and a diameter of 10 mm were mixed (5 mm: 10 mm = 30 volume%: 70 vol%) and pulverized at 360 rpm for 1 hour. In addition, the volume of the chitosan was set to 30% by volume based on 100% by volume of the total volume of the balls used for the activated carbon precursor and the ball mill.

The ground chitosan was washed sequentially with 1 M hydrochloric acid solution and ethanol, and dried in a vacuum oven. The pulverized chitosan 2g was heated into a tubular furnace under a N ₂ atmosphere at a heating rate of 2 ℃ / min up to 900 ℃ was maintained for 90 minutes. The mixture was cooled to room temperature, washed twice with 0.1 M hydrochloric acid solution and distilled water, and completely dried at 120 ° C for more than 12 hours to produce activated carbon.

Experimental Example

Experimental Example  1: Nitrogen adsorption experiment

77K / nitrogen adsorption experiment was carried out using BELSORP MAX equipment of BELSORP, Japan. The results are shown in Figs. 4 to 6 and Table 1.

The process of deriving the data of Table 1 is as follows. The specific surface area was derived using the Brunauer-Emmett-Teller (BET) equation. In the case of total pore volume, the adsorption curve up to the relative pressure (0.990) was obtained. Also, the microcavity was derived using Dubinin Radushkevich (DR) equation. In the case of medium pore volume, The volume was calculated as the volume excluding the blood.

As can be seen from FIGS. 4 to 6 and Table 1, it can be confirmed that the pore is hardly developed in the case of Comparative Example 1, which is not subjected to the activation step. On the other hand, in the case of the activated carbon of Example 1 in which carbon dioxide-steam activation using carbon dioxide and distilled water at the same time was performed, the development of micropore was improved compared to Example 2 in which steam activation was performed only by distilled water.

division BET specific surface area
(m ² g ^-1 ) Total pore volume
(cm ³ g ^-1 ) Medium porosity
(mesopore)
Pore volume
(cm ³ g ^-1 ) Fine porosity
(micropore)
Pore volume
(cm ³ g ^-1 ) Example 1 505 0.257 0.084 0.173 Example 2 390 0.186 0.050 0.136 Comparative Example 1 4 - - -

Experimental Example  2 : XPS , EA  analysis

Activated carbon surface functional groups were analyzed by Thermo XPS equipment. The results are shown in Fig. As can be seen from FIG. 7, in each of Examples 1 and 2 and Comparative Example 1, N peak (red elliptical portion) was formed. As a result, it was confirmed that nitrogen functional groups were introduced on the activated carbon surface.

The contents of the elements present in the activated carbon are analyzed through composition analysis and summarized in Table 2 below.

division C (wt%) H (wt%) O (wt%) N (wt%) Example 1 93.27 0.62 4.80 1.31 Example 2 91.43 1.01 6.34 1.22 Comparative Example 1 90.01 2.67 3.11 4.21

As shown in Table 2, the content of N was decreased by the activation step, and it was analyzed that the activation material reacted with the surface N during the pore formation to decrease the content. It can be confirmed that the content of N in Example 1 is higher than that of Example 2.

Experimental Example  3: Carbon dioxide adsorption experiment

Carbon dioxide adsorption experiment of 298K / 1 bar was carried out using BELSORP MAX equipment of BELSORP, Japan. The results are shown in Fig. To maintain the room temperature, a solution of 3: 7 ethylene glycol / water in a thermostat was maintained at 298K.

As can be seen from FIG. 8, it was confirmed that the carbon dioxide adsorption effect of Example 1 in which carbon dioxide-steam activation was performed was improved as compared to Example 2 in which only steam activation was performed.

As a result, the activated carbon of Example 1 showed the best effect through carbon dioxide-steam activation. It is analyzed that the carbon dioxide adsorption amount in the direction of the surface nucleation is increased due to the increase of the surface nitrogen content and the improvement of the surface porosity.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (18)

Preparing an activated carbon precursor;
Mixing the activated carbon precursor and the nitrogen compound to prepare a mixture;
A carbonization step of heat-treating the mixture under an inert gas; And
An activation step of heat-treating the carbonized mixture under a carbon dioxide and steam mixture;
Lt; / RTI >
In the activating step,
Wherein the mixed gas comprises 10 to 50% by volume of carbon dioxide and 50 to 90% by volume of steam. The method according to claim 1,
Wherein the activated carbon precursor comprises nitrogen. The method according to claim 1,
Wherein the activated carbon precursor comprises chitosan, polypyrrole, or melamine. The method according to claim 1,
After the step of preparing the activated carbon precursor,
Further comprising smoothing the activated carbon precursor. ≪ RTI ID = 0.0 > 11. < / RTI > 5. The method of claim 4,
Wherein the smoothing step comprises:
Wherein a ball mill used for the ball mill has a particle diameter of 1 mm to 20 mm. 6. The method of claim 5,
With respect to 100 vol% of the total volume of the activated carbon precursor and the ball used for the ball mill,
Wherein the volume of the activated carbon precursor is between 0.1% and 40% by volume. 6. The method of claim 5,
Wherein the ball mill processing speed is 100 rpm to 500 rpm. 6. The method of claim 5,
And the ball mill treatment time is 30 minutes to 5 hours. The method according to claim 1,
Wherein the nitrogen compound comprises monoethanolamine (MEA), diethanolamine (DEA), triethanolamine, polyethylenediamine, or ethylenediamine. The method according to claim 1,
And 5 to 200 parts by weight of the nitrogen compound is mixed with 100 parts by weight of the activated carbon precursor. The method according to claim 1,
Wherein the step of mixing the activated carbon precursor and the nitrogen compound to prepare a mixture is carried out by wet mixing in the presence of a solvent, and the solvent is a solvent having a hydroxyl group. delete The method according to claim 1,
The carbonization step may include:
Lt; RTI ID = 0.0 > 700 C < / RTI > delete The method according to claim 1,
Wherein,
Lt; RTI ID = 0.0 > 700 C < / RTI > The method according to claim 1,
Wherein,
Wherein the mixed gas is introduced into the activated carbon precursor at a rate of 1 ml / h to 100 ml / h. The method according to claim 1,
Wherein the activating step is carried out under a pressure of 5 bar or less. The method according to claim 1,
Wherein the activating step is performed for 1 to 5 hours.

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