KR102050343B1 - Activated carbon for water purifier - Google Patents

Abstract

Powdered or granular activated carbon for water purifier of the present invention has a BET specific surface area of activated carbon of 700 m 2 / g or more and less than 1250 m 2 / g, and a pore volume ratio of pore diameter of 2 nm or less to pore volume of 30 nm or less of pore diameter is 50% or more. It is less than 80%, and it has a summary that the pore volume ratio of the pore diameter of 2 nm or more and 10 nm or less with respect to the pore volume of 30 nm or less of pore diameters is 10% or more and less than 40%.

Description

Activated carbon for water purifier {ACTIVATED CARBON FOR WATER PURIFIER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to activated carbon for water purifiers and, more particularly, to activated carbon for water purifiers having excellent adsorption performance of organic halogen compounds.

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 has an oxidative decomposition effect of organic matter in addition to sterilization action, and produces organic halogen compounds such as trihalo methane, which is a carcinogenic substance. The organic halogen compound remaining in the tap water has a low molecular weight and a very low concentration in the tap water. Therefore, in conventional activated carbon, it was difficult to fully remove these organic halogen compounds.

It is proposed to optimize the pore diameter distribution of activated carbon for such a problem. It is thought that increasing the mesopore volume ratio is useful for adsorption of an organic halogen compound, and various proposals have been made.

For example, Patent Document 1 proposes a granular carbon molding obtained by carbonizing phenolic resin powders and activating particles. The specific boiling area is controlled by controlling the specific surface area, the relationship between pore diameter and pore volume, particle volume density, and packing density. A technique for improving the adsorptivity to chlorine compounds is disclosed.

In addition, Patent Document 2 discloses a technique for improving the adsorption property to trihalomethanes by controlling the pore volume ratio of the pore diameter of 20 to 100 mm 3 and the pore volume of the pore diameter of 10 m 3 to the pore volume of the pore diameter of 100 m or less. have.

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

In recent years, with the increase in water demand, activated carbon has been required to improve the adsorption performance of organic halogen compounds under water flow conditions. However, conventional activated carbon did not have sufficient adsorption performance under water flow conditions.

The present invention has been made in view of the above circumstances, and an object thereof is to provide not only an equilibrium adsorption amount to organic halogen compounds, but also to provide activated carbon for water purifiers having excellent adsorption performance under water flow conditions.

The activated carbon for water or granular water purifier according to the present invention, which has solved the above problems, has a BET specific surface area of 700 m 2 / g or more and less than 1250 m 2 / g, and a pore volume of 2 nm or less in pore diameter for a pore volume of 30 nm or less in pore diameter. The proportion is 50% or more and less than 80%, and the pore volume ratio of the pore diameter of 2 nm or more and 10 nm or less to the pore volume of the pore diameter of 30 nm or less is 10% or more and less than 40%.

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

In addition, the activated carbon for water purifier of the present invention is preferably an activation treatment of the carbide of the paper-phenol resin laminate until the BET specific surface area is within the above range, and the activation activation is also a steam activation treatment.

(Effects of the Invention)

Since the specific surface area and the pore structure of the activated carbon for water purifier of the present invention are optimized, not only the equilibrium adsorption amount to the organic halogen compound, but also excellent adsorption performance can be obtained under water flow conditions.

BRIEF DESCRIPTION OF THE DRAWINGS It is a graph which shows the relationship of the 1,1,1- trichloroethane equilibrium adsorption amount and specific surface area in the equilibrium test of each activated carbon of an Example.
Fig. 2 is a graph showing the relationship between the amount of 1,1,1-trichloroethane water flow and the specific surface area in the water flow test of each activated carbon of the example.
3 is a graph showing the pore diameter distribution of each activated carbon of the example.

The organic halogen compound is adsorbed into the micropores having a pore diameter of 2 nm or less, but in order to improve the adsorption performance of the organic halogen compound under water passage conditions, it is necessary to improve the diffusion rate of the organic halogen compound in the particles. For this purpose, it is considered that an increase in mesopores having a pore diameter of more than 2 nm and 50 nm or less, which is the introduction path into the micro holes, is essential. However, conventional activated carbon has insufficient control of specific surface area and pore volume, and cannot effectively remove organic halogen compounds under water-permeable conditions.

For example, in patent document 1, the ratio of the pore volume of the pore diameter of 0.6-0.8 nm of spherical phenol resin is raised. However, in Patent Literature 1, the relatively large pores that contribute to the improvement of the diffusion rate in the pores of the organic halogen compound are not sufficiently considered, and are not sufficient to improve the adsorption performance under the water passing conditions.

Moreover, in patent document 2, the adsorption | suction performance with respect to the organic halogen compound under water flow conditions is aimed at by improving the pore volume ratio of the pore diameter of 2-10 nm of activated carbon which uses fullerene as a raw material. However, there is room to examine the relationship between the pore diameter and the pore volume from the viewpoint of achieving a better adsorption amount and the diffusion rate of the organic halogen compound under water flow conditions. Particularly, in Patent Document 2, fullerene is used as a raw material of activated carbon. However, in activated carbon having high production cost, and using fullerene as a raw material, it is desirable to adjust the specific surface area and pore volume suitable for improving the adsorption performance of organic halogen compounds under water flow conditions. There was a problem of difficulty.

Therefore, the present inventors examined not only the equilibrium adsorption amount with respect to the organic halogen compound, but also the activated carbon which has the outstanding adsorption performance under water flow conditions. As a result, the relationship between the pore diameter and the pore volume and the specific surface area which can balance the adsorption amount and the diffusion rate of the organic halogen compound in a balanced manner were found.

That is, the powdered or granular activated carbon for water purifier of the present invention has a pore volume ratio of 2 nm or more and 10 nm or less in pore diameter (hereinafter, referred to as "pore volume ratio of 2 to 10 nm") in mesopores contributing to the diffusion rate improvement of the organic halogen compound. ) And the pore volume ratio (hereinafter may be referred to as "pore volume ratio of 2 nm or less") with a pore diameter of 2 nm or less, which contributes to the improvement of the adsorption amount of the organic halogen compound, and the specific surface area of activated carbon is strictly controlled. By doing so, it was found that the equilibrium adsorption amount to the organic halogen compound and the adsorption performance under water flow conditions can be improved.

The activated carbon for water purifier of the present invention has a BET specific surface area of 700 m 2 / g or more and less than 1250 m 2 / g, and a pore of 2 nm or less with respect to a pore volume of the pore diameter of 30 nm or less (hereinafter may be 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 water purifier of the present invention having the above structure has a rapid movement and diffusion of the organic halogen compound in the activated carbon, and also has sufficient adsorption sites. Therefore, the activated carbon of this invention is excellent in the adsorption performance on water flow conditions.

Hereinafter, the activated carbon of this invention is demonstrated concretely.

[BET specific surface area is more than 700㎡ / g and less than 1250㎡ / g]

If the BET specific surface area of activated carbon is too small, sufficient adsorption amount cannot be obtained. Therefore, the BET specific surface area is 700 m 2 / g or more, preferably 800 m 2 / g or more, more preferably 900 m 2 / g or more. On the other hand, when the BET specific surface area becomes too large, the packing density of activated carbon decreases, and the pore volume ratio of 2 nm or less that contributes to the adsorption amount improvement and the pore volume ratio of 2-10 nm that contributes to the diffusion rate can be secured in a balanced manner. There will be no. Therefore, the BET specific surface area is less than 1250 m 2 / g, preferably 1100 m 2 / g or less, more preferably 1050 m 2 / g or less, still more preferably less than 1000 m 2 / g.

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

The pores of activated carbon having a pore diameter of 2 nm or less are effective pores for improving the adsorption amount of the organic halogen compound, and when the pore volume ratio of 2 nm or less is too small, sufficient adsorption amount cannot be secured. Therefore, the pore volume ratio of 2 nm or less with respect to the total pore volume is 50% or more, Preferably it is 60% or more, More preferably, it is 70% or more. On the other hand, when the pore volume ratio of 2 nm or less becomes too large, the pore volume ratio of 2 to 10 nm which contributes to the improvement of the diffusion rate cannot be sufficiently secured, and the adsorption performance under water passing conditions is lowered. Therefore, the pore volume ratio of 2 nm or less to the total pore volume is less than 80%, preferably 75% or less.

[Pore volume ratio of pore diameter greater than 2nm and less than 10nm to total pore volume is more than 10% and less than 40%]

Pore diameters of activated carbon of 2 nm or more and 10 nm or less are effective for improving the diffusion rate of the organic halogen compound into the activated carbon and improving the adsorption performance under water-passing conditions. When the pore volume ratio of 2 to 10 nm is too small, the diffusion rate is slowed down and the adsorption performance under water passing conditions is lowered. Therefore, the pore volume ratio of 2-10 nm with respect to the total pore volume is 10% or more, Preferably it is 15% or more, More preferably, it is 20% or more, More preferably, it is 25% or more. On the other hand, when the pore volume ratio of 2 to 10 nm becomes too large, the pore volume ratio of 2 nm or less is lowered and the adsorption amount is lowered. Therefore, the pore volume ratio of 2-10 nm with respect to the total pore volume is less than 40%, Preferably it is 35% or less.

In order to further improve the adsorption performance under water passing conditions for the organic halogen compound, it is preferable to satisfy the following conditions.

[Pore Volume Ratio of 10 nm or Less to Total Pore Volume]

Further, as described above, the pore having a pore diameter of 10 nm or less of the activated carbon is a pore which contributes to the improvement of the adsorption amount and the diffusion rate, and by securing a certain amount or more, the adsorption performance of the activated carbon can be improved. Therefore, the total volume ratio (hereinafter sometimes referred to as "pore volume ratio of 10 nm or less") of the pore volume ratio of 2 nm or less and the pore volume ratio of 2 to 10 nm with respect to the total pore volume of activated carbon is preferably 80%. As mentioned above, More preferably, it is 85% or more, More preferably, it is 90% or more. Although an upper limit is not specifically limited, When the pore volume ratio of 10 nm or less becomes large too large, the meso hole and macro hole which have a large pore diameter of more than 10 nm of pore diameter used as an introduction of an organic halogen compound will decrease, and the organic halogen compound inside activated carbon will decrease. Transfer and diffusion efficiency decrease, and the adsorption performance under water passing conditions decreases. Therefore, the pore volume ratio of 10 nm or less to the total pore volume is preferably 98% or less, more preferably 96% or less, even more preferably 95% or less.

[Total Pore Volume of Activated Carbon]

The activated carbon of the present invention may satisfy the pore volume ratio, and the pore volume of the 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 adsorption amount cannot be secured. Therefore, the total pore volume is preferably 0.30 cm 3 / g or more, more preferably 0.40 cm 3 / g or more, still more preferably 0.50 cm 3 / g or more. The upper limit of the total pore volume is not particularly limited, for example, preferably 0.80 cm 3 / g or less, and 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, even more preferably 2.2 nm or more, from the viewpoint of improving the efficiency of introducing the organic halogen compound into the activated carbon. More preferably, it is 2.3 nm or more. On the other hand, when the average pore diameter becomes too large, the packing density may decrease, so it is preferably 4.0 nm or less, more preferably 3.5 nm or less, and still more preferably 3.0 nm or less.

[Average particle diameter of activated carbon]

The activated carbon of the present invention may be powder or granular, and the average particle diameter is not particularly limited, but is preferably 20 µm or more, more preferably 30 µm or more, still more preferably 40 µm or more, preferably 300 µm or less, More preferably, it is 150 micrometers or less, More preferably, it is 100 micrometers or less.

Activated carbon of the present invention is trichloromethane, such as trichloromethane, trifluoromethane, chlorodifluoromethane, bromodichloromethane, dibromochloromethane, tribromethane, trichloroethane, trichloroethylene Organic halogen compounds, such as these, More preferably, it has the outstanding adsorption performance with respect to 1,1,1- trichloroethane which is small in molecular weight and hard to adsorb | suck.

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

The activated carbon of the present invention can achieve a balance adsorption amount of preferably 20 mg / g or more, more preferably 25 mg / g or more based on the equilibrium test of the later example. The activated carbon of the present invention is preferably activated charcoal for removing trihalo compounds under water-permeable conditions, and the amount of water that can maintain the removal rate of 80% or more of the organic halogen compound based on the water-permeation test of the later example is preferably water flow rate of 52 L / g. As mentioned above, More preferably, it is 60 L / g or more, More preferably, it is 70 L / g or more, More preferably, it is 80 L / g or more.

The form of the water purifier using the activated carbon of this invention is not specifically limited, It can be used for various well-known water purifiers.

Hereinafter, although the manufacturing method of the activated carbon of this invention is demonstrated concretely, the manufacturing method of this invention is not limited to the following manufacturing examples, It can change suitably, These are also included in this invention.

The activated carbon of the present invention can be produced by activating the activating material. "Resurrection process" is a process which forms pores on the surface of an activating raw material, and enlarges a specific surface area and a pore volume. It is recommended to revive the water vapor as the revival treatment. In addition, an activation process may be performed only once and may be performed multiple times. The activated raw material may be used as a raw material of general activated carbon, but the following raw materials are particularly recommended.

As the activating raw material, a activating raw material (hereinafter referred to as "mesohole forming raw material") where relatively large pores are easy to form and a activating raw material (hereinafter referred to as "microporous forming raw material") where relatively small pores are easily formed Is preferred. When the composite of mesoporous-forming raw material and microporous-forming raw material is used as the activating raw material, activated carbon having a pore volume ratio corresponding to each of the predetermined pore diameters is obtained by one activating treatment without performing activating plural times.

As mesoporous-forming raw materials, for example, cellulose-based raw materials such as paper, cotton fibers, and wood materials may be mentioned. As a microporous raw material, synthetic resin raw materials, such as a phenol resin and a furan resin, etc. are mentioned, for example. At least one of these mesoporous-forming raw materials and microporous-forming raw materials is used respectively. Moreover, what is necessary is just to change suitably the compounding ratio of a mesopore formation raw material and a micropore formation raw material according to the physical property of desired activated carbon. As a composite of a mesoporous-forming raw material and a microporous-forming raw material, for example, a paper-phenol resin laminate is preferable.

The paper-phenol resin laminate can control the formation of mesopores and micropores strictly by controlling the activation conditions in comparison with the activated carbons made of phenol resins, fullerenes and the like used in Patent Document 1 and Patent Document 2. Therefore, the specific surface area, the pore volume ratio, etc. of activated carbon can be controlled more precisely. Thus, activated carbon having excellent adsorption performance of the organic halogen compound under water passage conditions is obtained.

It is preferable to carbonize and use the mixture or composite of mesoporous-forming raw material and microporous-forming raw material. The carbonization treatment is usually performed by heat treatment at a temperature and time at which the carbon raw material is not burned under an inert gas atmosphere such as nitrogen gas, helium, argon gas, or the like. The temperature of the carbonization treatment is preferably 500 ° C or higher, more preferably 550 ° C or higher, preferably 850 ° C or lower, and more preferably 800 ° C or lower. The holding time is not particularly limited, but the holding time may be held at the carbonization temperature for about 5 to 10 minutes or more.

The activation process 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 standpoint of simple and precise control of the BET specific surface area and pore volume ratio, steam regeneration is preferred.

In steam activation, the activating material is heated to a predetermined temperature, and then the activating treatment is performed so as to be within the range of the predetermined BET specific surface area and the pore volume ratio by supplying steam. The heating of the activating raw material is preferably performed in an inert gas atmosphere such as nitrogen, argon or helium.

As for the temperature (furnace internal temperature) at the time of an activation process, 400 degreeC or more is preferable, More preferably, it is 450 degreeC or more, 1500 degrees C or less is preferable, More preferably, it is 1300 degrees C or less. In addition, the heating time at the time of the activation process is preferably 0.5 hours or more, more preferably 1.0 hours or more, 10 hours or less is preferable, and more preferably 5 hours or less.

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

The supply form of steam is not specifically limited, For example, the form which supplies without diluting water vapor, and the form which dilutes water vapor with an inert gas and supplies it as a mixed gas are possible. In order to advance an activation reaction efficiently, the form which dilutes and supplies with an inert gas is preferable. When water vapor is diluted with an inert gas and supplied, the water vapor partial pressure in the mixed gas (voltage 101.3 kPa) is preferably 30 kPa or more, more preferably 40 kPa or more.

Activated carbon after steam activation may be subjected to washing treatment, heat treatment and grinding treatment as necessary. The washing treatment is carried out using a known solvent such as water, an acid solution or an alkaline solution of activated carbon after steam activation. By washing activated carbon, impurities such as ash can be removed. The heat treatment further heats the activated carbon after steam activation or after washing in an inert gas atmosphere. By heat-treating activated carbon, the water contained in activated carbon can be removed. Grinding is performed using a disk mill, a ball mill, a bead mill, or the like. Moreover, what is necessary is just to adjust the particle diameter of activated carbon suitably as needed.

This application claims the benefit of priority based on Japanese Patent Application No. 2014-76685 for which it applied on April 3, 2014. The entire contents of the specification of Japanese Patent Application No. 2014-76685, filed April 3, 2014, are incorporated herein by reference.

Example

Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not restrict | limited by the following example from the beginning, It adds and implements a change suitably in the range which may be suitable for the meaning of the previous and the later. Of course, it is possible, and these are all included in the technical scope of this invention.

(Measurement conditions, etc.)

1. Specific surface area, total pore volume

After 0.2 g of activated carbon was vacuum heated at 250 ° C., a adsorption isotherm was obtained using a nitrogen adsorption apparatus (manufactured by Micromeritics, Inc., “ASAP-2400”), and the specific surface area (m 2 / g) was calculated by the BET method. From the adsorption isotherm, the total pore volume (V _total : cm 3 / g) of pores with a pore diameter of 30 nm or less was calculated.

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

The average pore diameter was calculated assuming the shape of the pores formed on the activated carbon in the form of a cylinder. Moreover, the pore volume of each pore diameter analyzed in BJH method, and calculated the pore volume in each pore diameter. Based on the specific surface area and total pore volume which were computed above, it computed by following formula (1)-(4). In addition, pore diameter distribution was 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) ... (1)

Pore volume (≤ V _{2 nm} : cm 3 / g) = pore diameter of 2 nm or less = total pore volume (V _total : cm 3 / g)-(pore volume of 2 to 10 nm (V _{2-10 nm} : cm 3 / g) + over 10 nm Pore volume (V _{10 nm} <: cm 3 / g) ... (2)

Pore diameter of more than 2 nm pore volume (V _{2-10 nm} : cm 3 / g) = total pore volume (V _total : cm 3 / g)-(pore volume of less than _{2 nm} (≤V _{2 nm} : cm 3 / g) + more than 10 nm Pore volume of (V _{10 nm} <: cm 3 / g)

Pore volume over 10 nm (V _{10 nm} <: cm 3 / g) = total pore volume (V _total : cm 3 / g)-(pore volume below _{2 nm} (≤V _{2 nm} : cm 3 / g) + pore volume from _{2 to} 10 _nm ( V _{2-10 nm} : cm 3 / g))

3. The pore volume ratio of the total pore volume for each pore diameter of the _{(V total) (≤V 2nm,} V 2-10nm, V 10nm <)

The pore volume ratio (%) of each pore diameter was computed by dividing each said pore volume by all pore volume.

4.water flow test

2.0 g of activated carbon having a particle size adjusted in the range of 53 to 250 µm was packed in a column (diameter 15 mm), and a water passage test was conducted according to JIS S 3201 (2010: Household Water Purifier Test Method). Specifically, raw water adjusted to 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 the passage of the column was quantitatively measured by the head space gas chromatogram method. The breakthrough point is set at 20% of 1,1,1-trichloroethane concentration of the effluent to the column influent, and the amount of 1,1,1-trichloroethane flow through when the breakthrough point is reached (= [total to the breakthrough point) Filtration quantity (L) / activated carbon mass (g)]) was computed and it was set as the filtration performance. The head space used was TurboMatrixHS manufactured by Perkin Elmer, and QP2010 manufactured by Shimadzu Seisakusho Co., Ltd. was used as the gas chromatogram mass spectrometer.

5.Equilibrium test

0.5 g of 1,1,1-trichloroethane was diluted with 50 mL of methanol, and then diluted 10 times with methanol to adjust the stock solution. 5 mL of the stock solution was diluted with pure water, and a 1,1,1-trichloroethane aqueous solution having a concentration of 5 mg / L was adjusted. After putting the activated carbon in which the stirrer and particle diameter were adjusted in the range of 53-250 micrometers in the brown Erlenmeyer flask with a volume of 100 mL, it was made to be full water with 1,1,1- trichloroethane aqueous solution, and it sealed. After that, the Erlenmeyer flask was loaded into a thermostat kept at 20 ° C and stirred for 14 hours. After 14 hours, the aqueous solution in the Erlenmeyer flask was filtered with a syringe filter. Equilibrium adsorption amount of the aqueous solution of 1,1,1-trichloroethane divided by the equilibrium concentration (mg / L) of 1,1,1-trichloroethane aqueous solution by the headspace gas chromatogram and the mass of activated carbon ( mg / g) is obtained, an adsorption isotherm is created, 1,1,1-trichloroethane equilibrium adsorption amount at equilibrium concentration 0.3 mg / L is calculated, and the adsorption amount to 1,1,1-trichloroethane is I did.

Activated Carbon No. One

The pulverized coal obtained by carbonizing a paper-phenol resin laminated body as a carbon raw material was heated at 870 degreeC, and it put in the heating furnace adjusted to the inert atmosphere. Simultaneously with the addition of the paper-phenol resin laminate, water vapor (water vapor partial pressure: 40 kPa) was supplied into the heating furnace, and steam activation was performed for 2.0 hours in an inert gas atmosphere to activate activated carbon No. 1 was obtained. In addition, the supply amount of water vapor was made into 300 mass parts with respect to 100 mass parts of paper-phenol resin laminated bodies which were thrown in.

Activated Carbon No. 2 to 4

Activated carbon No. Activated carbon No. 2-4 were manufactured.

Activated Carbon No. 5

Commercially available coconut shell steam revival activated carbon (manufactured by MC Evatec Co., Ltd.) It was five.

Activated Carbon No. 6

Potassium hydroxide having a mass ratio of 0.64 times was added to 30 g of the carbonized paper-phenol resin laminate as an activator, and then, it was charged into a heating furnace and treated for activation for 2 hours at 800 ° C. in a nitrogen atmosphere. The hydrochloric acid washing process (hydrochloric acid concentration 5.25 mass%) is performed after performing the water washing process in the obtained activated carbon in 60 degreeC warm water, and water washing process in 60 degreeC warm water. Thereafter, the activated carbon was placed in a muffle furnace, under nitrogen flow (2 L / min), the furnace temperature was raised to 750 ° C (raising rate: 10 ° C / min), and maintained at 750 ° C for 2 hours. 6 was prepared.

1 shows the relationship between the 1,1,1-trichloroethane equilibrium adsorption amount and specific surface area in the equilibrium test of each activated carbon. 2 shows the relationship between the amount of water passed through 1,1,1-trichloroethane and the specific surface area in the water flow test for each activated carbon. 3 shows activated carbon No. Pore diameter distribution of 1-6 is shown.

As shown in FIG. 1, activated carbon No. using the paper-phenol resin laminated body. 1 to 4 and 6 are activated carbon Nos. It had better adsorption performance in the equilibrium test than 5. In addition, as shown in FIG. 2, in a water flow test, activated carbon No. 1-4 are activated carbon No. It had better adsorption performance than 6.

As shown in Fig. 3, activated carbon No. 1-4 are activated carbon No. Compared with 5 and 6, the pore volume ratio of 2-10 nm is large. Therefore, activated carbon No. satisfying the requirements of the present invention. 1 to 4 are considered to exhibit excellent adsorption performance to 1,1,1-trichloroethane in both the equilibrium test and the water passage test.

Claims (6)

BET specific surface area is 700㎡ / g or more and less than 1000㎡ / g,
The pore volume ratio of the pore diameter of 2 nm or less to the pore volume of the pore diameter of 30 nm or less is 60% or more and less than 80%.
The pore volume ratio of the pore diameter of 2 nm or more and 10 nm or less to the pore volume of the pore diameter of 30 nm or less is 10% or more and less than 40%.
Activated carbon for powder or granular water purifier, characterized in that the average particle diameter is 20 µm or more. The method of claim 1,
Activated carbon for water purifiers having an average pore diameter of the activated carbon of 2.0 nm or more and 4.0 nm or less. The method of claim 1,
Activated carbon for water purifiers having a pore volume ratio of 10 nm or less to a pore volume of 30 nm or less of the activated carbon of 80% or more. The method of claim 2,
Activated carbon for water purifiers having a pore volume ratio of 10 nm or less to a pore volume of 30 nm or less of the activated carbon of 80% or more. The method according to any one of claims 1 to 4,
The activated carbon is activated carbon for a water purifier, wherein the carbide of the paper-phenolic resin laminate is reactivated until the BET specific surface area is within the above range. The method of claim 5,
The activated carbon for water purifier is the activated carbon water treatment.

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