KR20160142275A - Activated carbon for water purifier - Google Patents

Abstract

The activated carbon for powder or granular water purifier of the present invention is characterized in that the activated carbon has a BET specific surface area of 700 m 2 / g or more and less than 1,250 m 2 / g and a pore volume ratio of pores having a pore diameter of 2 nm or less to a pore volume of 30 nm or less of 50% And a pore volume ratio of not less than 10 nm and not more than 10 nm for pore diameters of not more than 30 nm and not more than 80% and a pore diameter of not more than 30 nm, is not less than 10% and less than 40%.

Description

{ACTIVATED CARBON FOR WATER PURIFIER}

The present invention relates to an activated carbon for a water purifier, and more particularly to an activated carbon for a water purifier excellent in the adsorption performance of an organic halogen compound.

Raw water for tap water is required to be treated with chlorine, and the treated tap water contains a certain amount of residual chlorine. On the other hand, residual chlorine also has an oxidative decomposition action of organic substances in addition to the sterilizing action, thereby producing organic halogen compounds such as trihalomethanes, which are carcinogenic substances. The organohalogen compounds remaining in tap water are small in molecular weight, and the concentration in tap water is very low. Therefore, it has been difficult to sufficiently remove these organic halogen compounds in the conventional activated carbon.

To solve this problem, it has been proposed to optimize the pore diameter distribution of activated carbon. It is believed that it is useful to increase the mesopore volume ratio to adsorb the organic halogen compound, and various proposals have been made.

For example, Patent Document 1 proposes a particulate carbon formed article in which carbonized and resolved particles of a phenol resin powder are bonded. By controlling the relationship between specific surface area, pore diameter and pore volume, particle bulk density, and packing density, A technique for improving the adsorptivity to a chlorine compound is disclosed.

Patent Document 2 discloses a technique for improving the adsorptivity to trihalomethanes by controlling the pore volume ratio of pores having a pore diameter of 20 Å to 100 Å and the pore volume ratio of pores having a pore diameter of 10 Å or less to a pore volume having a pore diameter of 100 Å or less have.

Japanese Patent Application Laid-Open No. 9-110409 Japanese Patent Application Laid-Open No. 2006-247527

BACKGROUND ART [0002] In recent years, with an increase in water demand, it has been desired to improve the adsorption performance of activated carbon against organohalogen compounds under flowing water conditions. However, conventional activated carbon does not have sufficient adsorption performance under flowing water conditions.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an activated carbon for a water purifier which has an adsorption capacity not only in equilibrium adsorption amount for organohalogen compounds, but also under flowing water conditions.

The activated carbon for powder or granular water purifier according to the present invention which can solve the above problems has a BET specific surface area of 700 to 850 m < 2 > / g and a pore volume of 2 nm or less in pore diameter And a pore volume ratio of not less than 10 nm but not more than 10% but less than 40% for pore volume of pores having a pore diameter of 30 nm or less.

The activated carbon for a water purifier of the present invention preferably has an average pore diameter of the activated carbon of 2.0 nm or more and 4.0 nm or less, and more preferably 80% or more of the pore volume of 10 nm or less with respect to the pore volume of the activated carbon having a pore diameter of 30 nm or less .

The activated carbon for purifying apparatus of the present invention is preferably an activated carbon treated with a charcoal of the paper-phenol resin laminate until the BET specific surface area falls within the above range, and the activated carbon is a steam activated carbon.

(Effects of the Invention)

Since the activated carbon for water purifier of the present invention has optimized specific surface area and pore structure, it can exhibit not only an equilibrium adsorption amount for organohalogen compounds but also an excellent adsorption performance even under flowing water conditions.

1 is a graph showing the relationship between the equilibrium adsorption amount of 1,1,1-trichloroethane and the specific surface area in the equilibrium test of each activated carbon in the examples.
2 is a graph showing the relationship between the amount of 1,1,1-trichloroethane and the specific surface area in the water flow test of each activated carbon in the examples.
3 is a graph showing the pore diameter distribution of each activated carbon in the examples.

The organohalogen compounds are adsorbed in micropores having a pore diameter of 2 nm or less. However, in order to improve the adsorption performance against organic halogen compounds under flowing water conditions, it is necessary to improve the diffusion rate of the organohalogen compounds in the particles. It is considered that the increase of mesopores having a pore diameter of more than 2 nm and less than 50 nm, which is an introduction route to micropores, is considered to be essential. However, in the conventional activated carbon, strict control of specific surface area and pore volume is insufficient, and organic halogen compounds can not be efficiently removed under running water conditions.

For example, in Patent Document 1, the ratio of the pore volume of the spherical phenol resin having a pore diameter of 0.6 to 0.8 nm is increased. However, in Patent Document 1, relatively large pores contributing to improvement of the diffusion rate in the pores of the organohalogen compound are not sufficiently taken into consideration, and it is not sufficient to improve the adsorption performance under the water-flow condition.

In Patent Document 2, the pore volume ratio of the activated carbon having fullerene as a raw material in pore diameters of 2 to 10 nm is improved, thereby improving the adsorption performance against organohalogen compounds under flowing water conditions. However, there is room for studying the relationship between the pore diameter and the pore volume from the viewpoint of making both the adsorption amount and the diffusion rate of the organic halogen compound compatible with each other under flowing water conditions. Particularly, in Patent Document 2, although fullerene is used as a raw material of activated carbon, the production cost is high, and in the case of activated carbon containing fullerene as a raw material, the specific surface area and pore volume suitable for improvement of adsorption performance against organic halogen compounds under water- There was a problem that it was difficult.

Therefore, the inventors of the present invention have studied an activated carbon having not only an equilibrium adsorption amount for an organohalogen compound but also an adsorption performance even under flowing water conditions. As a result, the relationship between the pore diameter and the pore volume, which can balance the adsorption amount and the diffusion rate of the organic halogen compound well, and the specific surface area were found.

That is, the powdery or granular activated carbon for a water purifier of the present invention has a pore volume ratio of not less than 2 nm and not more than 10 nm (hereinafter referred to as " pore volume ratio of 2 to 10 nm ") in the mesopores contributing to the diffusion rate of the organohalogen compound (Hereinafter sometimes referred to as " pore volume ratio of not more than 2 nm ") having a pore diameter of not more than 2 nm, which contributes to the improvement of the adsorption amount of the organic halogen compound, Thereby finding that the equilibrium adsorption amount for the organohalogen compound and the adsorption performance under the water flow condition can be improved.

The activated carbon for purifying water according to the present invention has a BET specific surface area of 700 m 2 / g or more and 1250 m 2 / g or less and a pore volume of 2 nm or less (hereinafter, referred to as "total pore volume" The volume ratio is 50% or more and less than 80%, and the pore volume ratio of 2 to 10 nm is 10% or more and less than 40% with respect to the total pore volume.

The activated carbon for purifying water of the present invention having the above-described structure has a fast migration and diffusion of the organohalogen compounds in the activated carbon, and also the adsorption site is sufficiently present. Therefore, the activated carbon of the present invention is excellent in adsorption performance under flowing water.

Hereinafter, the activated carbon of the present invention will be specifically described.

[BET specific surface area of not less than 700 m 2 / g but not more than 1250 m 2 / g]

If the BET specific surface area of activated carbon is too small, a sufficient adsorption amount can not be obtained. Therefore, the BET specific surface area is at least 700 m 2 / g, preferably at least 800 m 2 / g, more preferably at least 900 m 2 / g. On the other hand, when the BET specific surface area is too large, the filling density of activated carbon is lowered, and the pore volume ratio of 2 nm or less contributing to the improvement of the adsorption amount and the pore volume ratio of 2 to 10 nm I will not. Therefore, the BET specific surface area is less than 1250 m 2 / g, preferably not more than 1100 m 2 / g, more preferably not more than 1050 m 2 / g, and still more preferably less than 1000 m 2 / g.

[Pore volume ratio of less than 2 nm in pore diameter to total pore volume is 50% or more and less than 80%]

The pores having a pore diameter of 2 nm or less of activated carbon are effective pores for improving the adsorption amount of the organohalogen compounds. If the pore volume ratio of 2 nm or less is too small, a sufficient adsorption amount can not be secured. Therefore, the pore volume ratio of 2 nm or less to the total pore volume is 50% or more, preferably 60% or more, and more preferably 70% or more. On the other hand, if the pore volume ratio of 2 nm or less is excessively large, the pore volume ratio of 2 to 10 nm, which contributes to the improvement of the diffusion rate, can not be sufficiently secured, and the adsorption performance under water-feeding conditions is deteriorated. Therefore, the pore volume ratio of 2 nm or less with respect to the total pore volume is less than 80%, preferably 75% or less.

[Pore volume over 2 nm and less than 10 nm in total pore volume is less than 10% and less than 40%]

The pores of the activated carbon having a pore diameter of more than 2 nm and 10 nm or less improve the diffusion rate of the organic halogen compound into the activated carbon and are effective for improving the adsorption performance under the water flow condition. When the pore volume ratio of 2 to 10 nm is too small, the diffusion rate is slowed, and the adsorption performance under the water flow condition is deteriorated. Therefore, the pore volume ratio of 2 to 10 nm to the total pore volume is at least 10%, preferably at least 15%, more preferably at least 20%, and even more preferably at least 25%. On the other hand, if the pore volume ratio of 2 to 10 nm is excessively large, the pore volume ratio of 2 nm or less decreases and the adsorption amount decreases. Therefore, the pore volume ratio of 2 to 10 nm to the total pore volume is less than 40%, preferably not more than 35%.

In order to further improve the adsorption performance of the organohalogen compound under water-feeding conditions, it is preferable to satisfy the following conditions.

[Pore volume ratio of less than 10 nm to total pore volume]

As described above, the pores having a pore diameter of 10 nm or less of the activated carbon contribute to the improvement of the adsorption amount and the diffusion rate, and the adsorption performance of the activated carbon can be enhanced by securing a certain amount of pores. Therefore, the total volume ratio of the above-mentioned pore volume ratio of 2 nm or less to the total pore volume of activated carbon and the pore volume ratio of 2 to 10 nm (hereinafter sometimes referred to as " pore volume ratio of 10 nm or less ") is preferably 80% Or more, more preferably 85% or more, and even more preferably 90% or more. Although the upper limit is not particularly limited, if the pore volume ratio of 10 nm or less is excessively large, meso pores and macropores having a large pore diameter exceeding 10 nm, which is the introduction route of the organohalogen compounds, are decreased and the organohalogen compounds The diffusion efficiency is lowered, and the adsorption performance under water flow conditions is lowered. Therefore, the pore volume ratio of 10 nm or less with respect to the total pore volume is preferably 98% or less, more preferably 96% or less, further preferably 95% or less.

[Total pore volume of activated carbon]

The pore volume, that is, the total pore volume, of the pores having a pore diameter of 30 nm or less, that is, the total pore volume is not limited. However, if the total pore volume is too small, sufficient amount of adsorption can not be ensured. Therefore, the total pore volume is preferably at least 0.30 cm 3 / g, more preferably at least 0.40 cm 3 / g, even more preferably at least 0.50 cm 3 / g. The upper limit of the total pore volume is not particularly limited, and is, for example, preferably 0.80 cm 3 / g or less, more preferably 0.70 cm 3 / g or less.

[Average pore diameter of activated carbon]

The average pore diameter of the activated carbon is not particularly limited, but is preferably 2.0 nm or more, more preferably 2.1 nm or more, still more preferably 2.2 nm or more, or more preferably 2.0 nm or more from the viewpoint of improving the introduction efficiency of the organic halogen compound into the activated carbon. More preferably at least 2.3 nm. On the other hand, when the average pore diameter is excessively large, the filling density may be lowered. Therefore, it is preferably 4.0 nm or less, more preferably 3.5 nm or less, furthermore preferably 3.0 nm or less.

[Average particle size of activated carbon]

The activated carbon of the present invention may be in the form of a powder or a granule, and the average particle size is not particularly limited, but is preferably 20 占 퐉 or more, more preferably 30 占 퐉 or more, further preferably 40 占 퐉 or more, More preferably not more than 150 mu m, further preferably not more than 100 mu m.

The activated carbon of the present invention may be produced by reacting a trihalomethane such as trichloromethane, trifluoromethane, chlorodifluoromethane, bromodichloromethane, dibromochloromethane or tribromomethane, trichloroethane, trichlorethylene , And more preferably an adsorbing property with respect to 1,1,1-trichloroethane which is small in molecular weight and hardly adsorbed.

The activated carbon of the present invention is preferable for the removal of the above substances contained in tap water or industrial wastewater.

The activated carbon of the present invention can achieve an equilibrium adsorption amount of preferably not less than 20 mg / g, more preferably not less than 25 mg / g, based on the equilibrium test of the latter embodiment. The activated carbon of the present invention is preferable as the activated carbon for removing the trihalo compound under the water-feeding condition, and the flow rate which can maintain the removal rate of the organic halogen compound at 80% or more based on the water-flow test in the latter embodiment is preferably 52 L / g More preferably not less than 60 L / g, more preferably not less than 70 L / g, even more preferably not less than 80 L / g.

The form of the water purifier using the activated carbon of the present invention is not particularly limited, and can be used in various known water purifiers.

Hereinafter, the method for producing activated carbon of the present invention will be described in detail, but the production method of the present invention is not limited to the following production examples, and can be appropriately changed, and these are also included in the present invention.

The activated carbon according to the present invention can be produced by subjecting the activated raw material to an activation treatment. "Resurrected treatment" is a treatment for forming pores on the surface of an activated raw material and increasing the specific surface area and pore volume. As for the resurrection treatment, it is recommended that the water vapor is revived. Also, the reviving process may be performed only once or plural times. The activated raw material may be one which can be used as a raw material for general activated carbon, but in particular, the following raw materials are recommended.

(Hereinafter referred to as " meso hole forming raw material ") and an activated raw material (hereinafter referred to as " micropores forming raw material " Is preferable. When a composite of the mesopore formation raw material and the micropores formation raw material is used as the starting material for activation, the activated carbon having the pore volume ratio according to the predetermined pore diameter is obtained by one-time activation processing without performing the activation processing plural times.

Examples of the mesopore formation raw materials include cellulose-based raw materials such as paper, cotton fiber, woody material and the like. Examples of raw materials for forming micropores include synthetic resin-based raw materials such as phenol resin and furan resin. These meso-hole forming raw materials and micro-hole forming raw materials are each used in at least one kind. The compounding ratio of the meso-hole-forming raw material and the micro-hole forming raw material may be suitably changed in accordance with the desired physical properties of the activated carbon. As a composite of the meso pore forming raw material and the micropores forming raw material, for example, a paper-phenol resin laminate is preferable.

The formation of mesopores or micropores can be strictly controlled by controlling the resurfacing conditions in comparison with activated carbon made of phenol resin or fullerene, which are used in Patent Document 1 or Patent Document 2, as the paper-phenol resin laminate. Therefore, it is possible to more precisely control the specific surface area and the pore volume ratio of the activated carbon. Therefore, activated carbon having excellent adsorption performance of organohalogen compounds can be obtained under flowing conditions.

It is preferable to use a mixture or composite of the mesopore formation raw material and the microporation forming raw material by carbonization treatment. The carbonization treatment may be conducted at a temperature and for a time at which the carbon raw material is not burned under an inert gas atmosphere such as nitrogen gas, helium, or argon gas. The temperature of the carbonization treatment is preferably 500 DEG C or higher, more preferably 550 DEG C or higher, preferably 850 DEG C or lower, more preferably 800 DEG C or lower. The holding time is not particularly limited, but it may be maintained at the carbonization temperature for 5 to 10 minutes or more.

The activation treatment is not particularly limited, and the BET specific surface area and the pore volume ratio of the activated carbon of the present invention may be obtained. From the viewpoint of controlling the BET specific surface area and the pore volume ratio easily and precisely, it is preferable to regenerate the water vapor.

In the water vapor activation, after the activated raw material is heated to a predetermined temperature, water vapor is supplied to perform the activation treatment so that the predetermined BET specific surface area and the pore volume ratio become the range. Heating of the material to be activated is preferably performed in an atmosphere of an inert gas such as nitrogen, argon or helium.

The temperature (inside temperature of the furnace) at the time of the resuming treatment is preferably 400 DEG C or higher, more preferably 450 DEG C or higher, and preferably 1500 DEG C or lower, and more preferably 1,300 DEG C or lower. Further, the heating time for the resuming treatment is preferably 0.5 hour or more, more preferably 1.0 hour or more, and preferably 10 hours or less, more preferably 5 hours or less.

The total amount of water vapor supplied during the resuming process is not particularly limited.

The form of supplying the water vapor is not particularly limited and may be, for example, a form in which water vapor is not diluted, or a form in which water vapor is diluted with an inert gas and supplied as a mixed gas. In order to efficiently perform the resurrection reaction, a form of diluting with an inert gas and supplying it is preferable. When water vapor is diluted with an inert gas and supplied, the partial pressure of water vapor in the mixed gas (voltage 101.3 kPa) is preferably 30 kPa or more, and more preferably 40 kPa or more.

The activated carbon after the water vapor activation may be subjected to a washing treatment, a heat treatment, and a pulverizing treatment as necessary. The washing treatment is carried out by using a known solvent such as water, an acid solution, or an alkali solution after activated water vapor. By washing the activated carbon, impurities such as ash can be removed. The heat treatment further heats the activated carbon after the water vapor activation or after the washing in an inert gas atmosphere. By treating the activated carbon with heat, the water contained in the activated carbon can be removed. The pulverization treatment is performed using a disk mill, a ball mill, a bead mill or the like. The particle size of the activated carbon may be suitably adjusted as necessary.

The present application claims the benefit of priority under Japanese Patent Application No. 2014-76685 filed on April 3, 2014. The entire contents of the specification of Japanese Patent Application No. 2014-76685 filed on April 3, 2014 are incorporated herein by reference.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to the following Examples in the beginning, but may be carried out by additionally modifying them in a range that is suitable for the purpose of the preceding and following Of course, all of which are within the technical scope of the present invention.

(Measurement conditions, etc.)

1. Specific surface area, total pore volume

0.2 g of activated carbon was vacuum-heated at 250 占 폚 and the adsorption isotherm was determined using a nitrogen adsorption apparatus ("ASAP-2400" manufactured by Micromeritics Co., Ltd.) and the specific surface area (m2 / g) The total pore volume (V _total : cm < 3 > / g) of pores having a pore diameter of 30 nm or less was calculated from the adsorption isotherm.

2. Average pore diameter, and pore volume of each pore diameter

The average pore diameter was calculated on the assumption that the shape of the pores formed on the activated carbon was cylinder-shaped. The pore volume of each pore diameter was analyzed in the BJH method, and the pore volume in each pore diameter was calculated. (1) to (4) based on the calculated specific surface area and total pore volume. The pore diameter distribution is shown in the graph of Fig.

Average pore diameter (nm) = (4 x total pore volume (V _total : cm 3 / g)) / specific surface area (m 2 / g)

Of ㎤ / g) + 10nm excess (2~10nm of pore volume (V _2-10nm - (㎤ / g _total V): pore diameter, a pore volume of less than 2nm (≤V _2nm ㎤ / g) = total pore volume Pore volume (V _{10 nm} <: cm 3 / g)) (2)

The pore volume of pore diameter greater than 10nm 2nm or less _{(V 2-10nm: ㎤ / g)} = total pore volume _{(V total: ㎤ / g)} - ( pore volume of more than _{2nm (≤V 2nm: ㎤ / g} ) + 10nm excess (V _{10 nm} & lt _;: cm 3 / g)) (3)

A pore volume of more than 10nm _{(V 10nm <: ㎤ / g} ) = total pore volume _{(V total: ㎤ / g)} - ( pore volume of more than 2nm _(2nm ≤V: pore volume of ㎤ / g) + 2~10nm ( V 2 - 10 _nm : cm 3 / g)) (4)

3. Pore volume ratio of each pore diameter (V _{2 nm} , V _{2-10 nm} , V _{10 nm} <) to _total pore volume (V _total )

The pore volume was divided by the total pore volume, and the pore volume ratio (%) of each pore diameter was calculated.

4. Water test

2.0 g of activated carbon adjusted to have a particle diameter within a range of 53 to 250 탆 was charged in a column (diameter: 15 mm), and water flow test was performed in accordance with JIS S 3201 (2010: domestic water purifier test method). Concretely, raw water adjusted to have a 1,1,1-trichloroethane concentration of 0.3 ± 0.060 mg / L was passed through the column at a space velocity (SV) of 500 h ^-1 . The 1,1,1-trichloroethane concentration before and after passage through the column was quantitatively measured by headspace gas chromatography. The breakthrough point is defined as the concentration of 1,1,1-trichloroethane in the effluent for the column influent, and the concentration of 1,1,1-trichloroethane at the point when the breakthrough point is reached (= Filtration water (L) / activated carbon mass (g)]) was calculated, and filtration performance was obtained. TurboMatrixHS manufactured by Perkin Elmer Co., Ltd., and QP2010 manufactured by Shimadzu Seisakusho Co., Ltd. were used as the headspace and gas chromatogram mass spectrometer.

5. Balance test

0.5 g of 1,1,1-trichloroethane was diluted with 50 mL of methanol, and further diluted 10-fold with methanol to prepare a stock solution. 5 mL of the undiluted solution was diluted with pure water, and a 1,1,1-trichloroethane aqueous solution having a concentration of 5 mg / L was prepared. Into a 100 mL Erlenmeyer flask was placed an agitator and activated carbon whose particle size was adjusted within a range of 53 to 250 mu m. Then, it was sealed with a 1,1,1-trichloroethane aqueous solution as full water. Thereafter, the Erlenmeyer flask was placed in a thermostatic chamber maintained at 20 ° C, and stirred for 14 hours. After 14 hours, the aqueous solution in the Erlenmeyer flask was filtered with a syringe filter. The filtrate thus obtained was subjected to an equilibrium adsorption amount of an aqueous solution of 1,1,1-trichloroethane in which the equilibrium concentration (mg / L) of the aqueous 1,1,1-trichloroethane solution and the activated carbon mass were divided into headspace gas chromatogram mg / g) to prepare an adsorption isotherm. The amount of 1,1,1-trichloroethane equilibrium adsorption at an equilibrium concentration of 0.3 mg / L was calculated, and the adsorption amount to 1,1,1-trichloroethane .

Activated carbon No. One

The pulverized coal obtained by carbonizing the paper-phenol resin laminate as the carbon raw material was heated to 870 캜 and charged into a heating furnace adjusted to an inert atmosphere. Simultaneously with the introduction of the paper-phenol resin laminate, water vapor (partial pressure of water vapor: 40 kPa) was supplied into the heating furnace and subjected to steam activation treatment for 2.0 hours in an inert gas atmosphere. 1. The supply amount of water vapor was set to 300 parts by mass with respect to 100 parts by mass of the paper-phenol resin laminate.

Activated carbon No. 2 to 4

Activated carbon No. other than changing the resurrection time. Activated carbon No. 1 was obtained in the same manner as in No. 1. 2 to 4 were prepared.

Activated carbon No. 5

A commercially available coconut shell steam activated carbon (manufactured by MC Evatek Co.) was prepared. 5.

Activated carbon No. 6

Potassium hydroxide was added to 30 g of the carbonized paper-phenol resin laminate as an activator in a mass ratio of 0.64, and then the mixture was put into a heating furnace and subjected to an activation treatment at 800 DEG C for 2 hours in a nitrogen atmosphere. The obtained recovered carbon was subjected to a water washing treatment at 60 ° C in hot water, followed by a hydrochloric acid cleaning treatment (at a hydrochloric acid concentration of 5.25 mass%), and a water washing treatment at 60 ° C in hot water. Thereafter, the activated carbon was placed in a muffle furnace, and the inside temperature of the furnace was raised to 750 ° C (temperature raising rate: 10 ° C / min) under flowing nitrogen (2 L / min.). 6.

Fig. 1 shows the relationship between the adsorption amount of 1,1,1-trichloroethane and the specific surface area in the equilibrium test of each activated carbon. Fig. 2 shows the relationship between the specific surface area and the amount of 1,1,1-trichloroethane in the water flow test of each activated carbon. FIG. Shows the pore diameter distribution of 1 to 6.

As shown in Fig. 1, activated carbon No. 1 using a paper-phenol resin laminate. 1 to 4, and 6 are activated carbon particles using a coconut shell. 5, it showed excellent adsorption performance in the equilibrium test. Further, as shown in Fig. 1 to 4 are activated carbon No. 6. &Lt; / RTI &gt;

As shown in Fig. 1 to 4 are activated carbon No. 5 and 6, the pore volume ratio of 2 to 10 nm is large. Therefore, the activated carbon satisfying the requirements of the present invention can be obtained. 1 to 4, as shown in Figs. 1 and 2, it is considered that excellent adsorption performance against 1,1,1-trichloroethane was exhibited both in the equilibrium test and in the water flow test.

Claims (5)

A BET specific surface area of 700 m 2 / g or more and less than 1250 m 2 / g,
The pore volume ratio of the pores having a pore diameter of 2 nm or less to the pore volume of the pore diameter of 30 nm or less is 50% or more and less than 80%
Wherein the pore volume ratio of the pores having a pore diameter of more than 2 nm and not more than 10 nm to the pore volume of the pore diameter of 30 nm or less is 10% or more and less than 40%. The method according to claim 1,
Wherein the activated carbon has an average pore diameter of 2.0 nm or more and 4.0 nm or less. 3. The method according to claim 1 or 2,
Wherein the activated carbon has a pore volume ratio of 10 nm or less to a pore volume of a pore diameter of 30 nm or less of 80% or more. 4. The method according to any one of claims 1 to 3,
Wherein the activated carbon is activated by activating the carbide of the paper-phenol resin laminate until the BET specific surface area falls within the above range. 5. The method of claim 4,
The activated process is a water vapor activation process.

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