JP5936423B2 - Activated carbon for water purifier and activated carbon cartridge using the same - Google Patents

Description

  The present invention relates to activated carbon for water purifiers and activated carbon cartridges using the same, and more particularly to activated carbon for water purifiers having improved adsorption performance of organochlorine compounds contained in water and activated carbon cartridges using the same.

  A water purifier used to remove residual components and foreign substances from drinking water such as tap water has a structure provided with an adsorbing member made of an inorganic material such as activated carbon or ceramic, and an organic polymer membrane for filtration if necessary. .

  Tap water is obligated to sterilize with chlorine from the viewpoint of hygiene. However, chlorine added for the purpose of sterilization produces organochlorine compounds such as trihalomethanes which are carcinogenic substances when humic substances which are a kind of natural organic substances are oxidatively decomposed. For this reason, activated carbon used for removing trihalomethanes has been proposed in which the functional group amount on the activated carbon surface is controlled by annealing at 400 to 700 ° C. after the activation treatment (see Patent Document 1). Further, an activated carbon in which activated carbon is heat-treated at 1200 to 1700 ° C. in an inert gas to change the pore structure has been proposed (see Patent Document 2).

  Furthermore, in recent years, the demand for water purifiers having a higher level of water purification capacity has increased due to the heightened health awareness. Therefore, various attempts have been made to improve the performance of activated carbon by improving the specific surface area and pore volume (see, for example, Patent Documents 3 and 4). However, in the conventional water purifier using activated carbon, although the performance of removing certain organochlorine compounds has been improved, there are few types that are satisfactory for adsorption of chloroform and 1,1,1-trichloroethane.

  Thus, activated carbon used for water purifiers having improved removal performance of chloroform and 1,1,1-trichloroethane among the conventional organic chlorine compounds has been demanded.

Japanese Patent No. 3506043 JP-A-8-26711 JP 2001-240407 A Japanese Patent No. 4628752

  The present invention has been made in view of the above points, and in the activated carbon used in the water purifier, among 1,1,1-trichloroethane and chloroform, among the organic chlorinated compounds contained in water, purified water with improved filtration capacity. The activated carbon cartridge using the activated carbon is provided together with the activated carbon for the device.

That is, the invention of claim 1 has a specific surface area of 900 to 1100 m ² / g, and in the measurement of pore distribution by the MP method, the total pore volume of pores having a pore diameter of 0 to 2.0 nm is 0.4110 cc. a is / g or more, a total pore volume of the following pore pore diameter 0.6nm and 40 to 45% of the total pore volume, in the measurement of the pore distribution by DH method, pore diameter 1 though the total pore volume of the pores of 100nm or less 0.1244cc / g, a total pore volume of the following pore pore diameter 2.0nm and 20 to 23% of the total pore volume, surface oxidation The present invention relates to activated carbon for water purifiers, which is made of activated carbon having a physical quantity of 0.05 to 0.14 meq / g, and has improved removal performance of chloroform and 1,1,1-trichloroethane among organochlorine compounds.

A second aspect of the present invention relates to an activated carbon cartridge, which is formed into a predetermined shape in a state where a binder is added to the activated carbon for water purifier according to the first aspect.

  The invention according to claim 3 relates to an activated carbon cartridge, wherein the activated carbon for water purifier according to claim 1 is filled in a water passage container having a predetermined shape.

According to the activated carbon for water purifiers according to the invention of claim 1, the specific surface area is set to 900 to 1100 m ² / g, and in the measurement of pore distribution by the MP method, the total pore volume of pores having a pore diameter of 0 to 2.0 nm a is but 0.4110cc / g or more, a total pore volume of the following pore pore diameter 0.6nm and 40 to 45% of the total pore volume, in the measurement of the pore distribution by DH method, fine and total pore volume of pores of pore diameter 1~100nm is equal to or less than 0.1244cc / g, a total pore volume of the following pore pore diameter 2.0nm of the total pore volume from 20 to 23% In addition, it is made of activated carbon with a surface oxide amount of 0.05 to 0.14 meq / g, so that filtration of 1,1,1-trichloroethane, which is an organic chlorine compound, and chloroform, together with the filtration performance necessary as an activated carbon for existing water purifiers. To improve your ability. It was.

  In addition, by overlapping the analysis areas of the MP method and the DH method, the proportion of pore volumes with different sizes developed in activated carbon can be grasped more accurately, and the evaluation of the filtration performance of organochlorine compounds becomes easy.

According to the activated carbon cartridge according to the invention of claim 2, since it is formed into a predetermined shape with the binder added to the activated carbon for water purifier according to claim 1, the filtration performance of the organic chlorine compound is improved more than ever. It can lead to the improvement of the treatment performance of the water purifier itself.

  According to the activated carbon cartridge according to the invention of claim 3, since the water purifier activated carbon according to claim 1 is filled in a water passage container having a predetermined shape, the cartridge can be easily assembled and more organic than ever. It leads to improving the filtration performance of the chlorine compound, and the treatment performance of the water purifier itself can be improved.

It is a whole perspective view which concerns on an example of the activated carbon cartridge using the activated carbon for water purifiers of this invention. It is a schematic diagram which shows the 1st manufacture example of the activated carbon cartridge using the activated carbon for water purifiers of this invention. It is a schematic diagram which shows the 2nd manufacturing example of the activated carbon cartridge using the activated carbon for water purifiers of this invention.

  Activated carbon is usually used as a filter medium in water purifiers for household and industrial use that purify tap water as raw water. Activated carbon is inexpensive, has excellent filtering ability, and has a stable quality. The filtration performance of the target substance of such a water purifier is described in JIS S 3201 (2010) as “free residual chlorine, turbidity, 2-chloro-4,6-bisethylamino-1,3,5-triazine ( Abbreviated as CAT), 2-methylisoborneol (abbreviated as 2-MIB), soluble lead, chloroform, bromodichloromethane, dibromochloromethane, bromoform, tetrachloroethylene, trichloroethylene, 1,1,1-trichloroethane, and total trihalomethane The maximum of 13 items is evaluated.

  Among the target substances shown here, organochlorine compounds, particularly 1,1,1-trichloroethane and chloroform, are difficult to remove. Then, the activated carbon for water purifiers of this invention is activated carbon which improved the filtration performance of 1,1,1-trichloroethane and chloroform.

  As raw materials for activated carbon, there are raw materials such as wood (waste wood, thinned wood, sawdust), coffee beans pomace, coconut husk, bark and fruit. These raw materials derived from natural products tend to develop pores by carbonization and activation. In addition, it can be procured inexpensively because it is a secondary use of waste. In the examples described later, coconut shells are used as a raw material in consideration of stable procurement.

  Activated carbon raw materials such as coconut shells are heated and carbonized at a medium temperature (200 ° C. to 600 ° C.) to form fine pores, and activated by high temperature (600 ° C. to 1200 ° C.) using water vapor or the like, Develops. After activation, it is completed by cooling such as natural cooling.

First, the specific surface area of the activated carbon is in the range of 900 m ² / g to 1100 m ² / g. The range is preferably 950 m ² / g to 1050 m ² / g. In the present specification, the specific surface areas of the examples are all measured by the BET method (Brunauer, Emmett & Teller method). When the specific surface area is less than 900 m ² / g, the pore volume becomes small, so that a sufficient adsorption amount cannot be obtained. Moreover, the kind of substance which can be adsorbed by a single activated carbon is limited, which is not preferable. When the specific surface area exceeds 1100 m ² / g, the pore size increases greatly, and the removal performance of 1,1,1-trichloroethane and chloroform is significantly lowered. From this, the range value of the specific surface area is derived as appropriate.

  Secondly, in the pore distribution of activated carbon, the adsorption efficiency of the adsorption target varies depending on how many pores of which diameter exist. It is thought to be influenced mainly by the size of the molecular species to be adsorbed. Therefore, it is important to appropriately control the pore distribution of the activated carbon when enhancing the removal performance of 1,1,1-trichloroethane and chloroform over the existing activated carbon for water purifiers.

  Specifically, in the analysis of the pore distribution of activated carbon by the MP method (Micropore method), the total pore volume of pores having a pore diameter of 0.6 nm or less is the total pore volume of pores having a pore diameter of 0 to 2 nm. The ratio is defined as 40% to 45% of the volume, preferably 43% to 44%. The MP method is generally used for analysis of pores having a diameter because it can relatively easily grasp the distribution analysis of micropores having a diameter of 2 nm or less. The pore having a pore diameter of 0.6 nm or less is related to adsorption and filtration of molecular species in a low molecular weight region such as chloroform. Therefore, by maintaining the volume of pores having a pore diameter of 0.6 nm or less in the total pore volume at a certain number or more, the filtration performance of the low-molecular organochlorine compound targeted by the present invention is further improved. Can do.

  As described above, when deviating upward or downward from the range value defined in the analysis of the pore distribution by the MP method, the intended removal performance of 1,1,1-trichloroethane and chloroform is greatly deteriorated.

  Thirdly, in the analysis of the pore distribution of activated carbon by the DH method (Dollimore-Heal method), the total pore volume of pores having a pore diameter of 2.0 nm or less is that of pores having a pore diameter of 1 to 100 nm. It is defined as a ratio of 20 to 23% of the total pore volume. The DH method is generally used for analysis of pores having a diameter of 2.0 nm to 50.0 nm because it can relatively easily grasp the distribution analysis of mesopores having a diameter of 2.0 nm to 50.0 nm. By defining the volume of pores having a pore diameter of 2.0 nm or less in an overlapping manner, it is possible to design activated carbon with a wide range of adsorption targets from molecular species in a low molecular weight region.

  Even in the analysis of the pore distribution by the DH method, when the value deviates from the above range value to the upper side or the lower side, the removal performance of the target chloroform and 1,1,1-trichloroethane is greatly reduced as in the MP method. . In addition, the adsorptive power of the other adsorbing components is also lowered, and the overall performance is lowered, which is not preferable.

  By overlapping the analysis area of the MP method and DH method for the distribution below the predetermined pore diameter in the total pore volume of activated carbon, the volume ratio of pores with different sizes developed in activated carbon can be grasped more accurately. Is done. Moreover, by using the volume ratio, the balance of the abundance of different pore diameters present in the activated carbon can be controlled relatively easily. This is an important indicator for activated carbon that is intended for use in water purifiers. The MP method and DH method will be further described in Examples.

The activated carbon obtained by firing and activating the raw carbon source has various functional groups on the activated carbon surface.
The acidic functional groups that increase due to the surface oxidation of the activated carbon are mainly hydrophilic groups such as carboxyl groups and phenolic hydroxyl groups, and affect the adsorption capacity. The amount of these acidic functional groups can be grasped as the amount of surface oxide. As the surface oxide amount of the activated carbon increases, the hydrophilicity of the activated carbon surface increases and the adsorption of hydrophobic substances tends to decrease. Therefore, the fourth physical property is that the surface oxide amount of the activated carbon is defined in the range of 0.05 to 0.14 meq / g, preferably 0.06 to 0.13 meq / g.

  When the amount of surface oxide is less than 0.05 meq / g, the activated carbon becomes too hydrophobic and the contact efficiency with water to be filtered is deteriorated. For this reason, the pores of the activated carbon are not utilized and affect the filtration performance of the target substance to be adsorbed. When the surface oxide amount exceeds 0.14 meq / g, the hydrophilicity of the activated carbon increases and the contact efficiency with water improves. However, the adsorption efficiency is reduced for hydrophobic substances such as trihalomethanes. Therefore, it can be said that the range of the surface oxide amount is desirable.

  Activated carbon having the above physical properties is made uniform as a particle size by sieving or the like, and is completed as activated carbon for a water purifier. The particle diameter of each activated carbon particle is about 0.01 mm to 2.0 mm. The activated carbon for water purifier is formed into a predetermined shape by mixing any one of acrylic fiber, polyethylene fiber, polypropylene fiber, polyacrylonitrile fiber, aramid fiber, cellulose fiber or the like as a binder. Therefore, it becomes one integrated molded product. Of course, other types of activated carbon such as fibrous activated carbon and silver impregnated activated carbon, lead remover, ceramic, etc. may be blended.

  Fig.1 (a) is an example of the activated carbon cartridge 10 formed using the activated carbon for water purifiers of this invention. According to the activated carbon cartridge 10, the hollow portion 12 penetrating in the longitudinal direction is formed in the cylindrical main body portion 11. The filtered water passes through the main body 11 and flows out from the activated carbon cartridge 10 through the cavity 12. In addition to using the activated carbon for water purifier of the present invention alone, the activated carbon cartridge can also be formed by mixing with other types of activated carbon (see Examples below). Of course, the molding method of the activated carbon cartridge is press molding, wet molding by suspension in water, or the like, and can be appropriately selected according to the target water purifier, application, size, and the like.

  FIG. 1B shows an application example of the activated carbon cartridge 10. In the figure, the water purifier 20 is attached to the tip of the faucet 25. A filtration chamber 23 is provided on the side of the water switching unit 21. The activated carbon cartridge 10 is loaded into the inside in a replaceable manner. Reference numeral 22 in the figure is a switching lever, and 24 is a lid. Of course, in the water purifier 20, in addition to the activated carbon cartridge 10, necessary members such as an ion exchanger, a hollow fiber filter, and a flow meter (not shown) are appropriately provided. In addition, the form of the water purifier is not limited to the illustrated example, and can be applied to various devices. Naturally, the activated carbon for water purifiers and the activated carbon cartridge of the present invention can be applied to a stationary type or an apparatus that has been increased in size by increasing the filtration capacity.

  The schematic diagram of FIG. 2 is an example of an activated carbon cartridge in which activated carbon for a water purifier of the present invention is filled in a water passage container having a predetermined shape. In Fig.2 (a), the inside of the water flow container 31 is filled with the activated carbon C for water purifiers. The water flow container 31 of this example is provided with a water conduit 32 at the center, and a water flow hole 33 is provided on the side of the body. In addition, it is appropriate to form the water passage hole in the water container. After the water container 31 is filled with a specified amount of activated carbon C for water purifier, a lid member 34 is placed on the upper part of the water container 31 as shown in FIG. Thus, the activated carbon C for the water purifier does not leak from the water flow container 31, and the activated carbon cartridge 30 is completed.

  When an activated carbon cartridge is formed from the activated carbon for water purifiers of the present invention, it leads to higher filtration performance of organochlorine compounds than ever. For this reason, the processing performance improvement of water purifier itself is realizable.

[Preparation of activated carbon for water purifier]
The inventors prepared activated carbon using coconut shell as a raw material. Raw material coconut shells (including baked coconut shells) were heated to 800 ° C. to about 900 ° C. and held, and steam was introduced to promote activation. After activation, the product was naturally cooled to near room temperature. After cooling, it is sieved with a 60-120 mesh sieve to obtain activated carbon for water purifiers of Examples 1, 2, 3, 4 and Comparative Examples 1, 2, 3, 4 and Comparative Examples 1, 2, 3, 4 having a particle size of about 0.1 mm to 0.3 mm. It was.

[Measurement items for activated carbon for water purifiers]
The following items were measured for the properties and performance of activated carbon for water purifiers. The results are in Table 1 and Table 2. Specifically, the specific surface area (m ² / g), the total pore volume (cc / g), the average pore diameter (nm), the total fineness of pores in the range of pore diameters of 0 nm to 2.0 nm by the MP method. Pore volume (cc / g), pore volume with a pore diameter of 0.6 nm or less (cc / g), total pore volume (cc / g) of pores having a pore diameter in the range of 1.0 nm to 100 nm by the DH method ) And pore volume of 2.0 nm or less pore diameter (cc / g), surface oxide amount (meq / g), iodine adsorption performance (mg / g), packing density (g / cc), benzene adsorption power ( %), 60-120 mesh remaining amount (%), 1,1,1-trichloroethane filtration capacity (L / cc), chloroform filtration capacity (L / cc). Details will be described below.

The specific surface area (m ² / g) was determined by measuring the nitrogen adsorption isotherm at 77K using a highly accurate fully automatic gas adsorption device BELSORP-mini manufactured by Bell Japan Co., Ltd., and obtained by the BET method.

As for the total pore volume (cc / g), in the range of the pore diameter of 0.6 nm to 100 nm, the amount of nitrogen adsorbed at a relative pressure of 0.953 using BELSORPmini manufactured by Nippon Bell Co., Ltd. and applying Gurvitsch's law ( V) was calculated by converting into the volume (V _p ) of liquid nitrogen by the following formula (i). In Equation (i), M _g is the molecular weight of the adsorbate (nitrogen: 28.020), and ρ _g (g / cm ³ ) is the density of the adsorbate (nitrogen: 0.808).

The average pore diameter (nm) is calculated by using the pore volume (cc / g) and specific surface area (m ² / g) values obtained from the above measurement, assuming that the pore shape is cylindrical. Obtained from ii).

  The parameter dV / dD representing the pore size distribution was measured by nitrogen adsorption using a highly accurate fully automatic gas adsorption device BELSORPmini manufactured by Bell Japan. The value of dV / dD in the pore diameter range of 1 nm to 100 nm was analyzed by the DH method from the adsorption isotherm of nitrogen gas. From the analysis results of the DH method, the total pore volume (cc / g) of pores having a pore diameter in the range of 1 nm to 100 nm and the total pore volume of pores having a pore diameter of 2.0 nm or less were obtained. Then, the ratio (%) of the total pore volume of pores having a pore diameter of 2.0 nm or less in the total pore volume in the range of pore diameters of 1 nm to 100 nm was calculated.

  The value of dV / dD in the pore diameter range of 0 nm to 2.0 nm was analyzed by the MP method from the t-plot of the nitrogen gas adsorption isotherm. From the analysis result of the MP method, the total pore volume (cc / g) of pores having a pore diameter ranging from 0 nm to 2.0 nm and the total pore volume of pores having a pore diameter of 0.6 nm or less were obtained. Then, the ratio (%) of the total pore volume of pores having a pore diameter of 0.6 nm or less in the total pore volume in the range of pore diameters of 0 nm to 2.0 nm was calculated.

  The amount of surface oxide (meq / g) was measured by applying the Boehm method, filtering a predetermined amount of activated carbon in a 0.05N aqueous sodium hydroxide solution for 24 hours, and titrating the filtrate with a 0.05N aqueous hydrochloric acid solution. Measured based on value.

  Iodine adsorption performance (mg / g) and packing density (g / cc) were measured according to the activated carbon test method specified in JIS K 1474 (2007). The benzene adsorption power (%) was measured by using the solvent as benzene in accordance with the method of adsorption performance of solvent vapor specified in JIS K 1474 (2007).

  The remaining amount (%) of sieving of 60 to 120 mesh was obtained by sieving the activated carbon produced using the mesh sieve and measuring the amount remaining on the sieve.

  The filtration capacity (L / cc) of 1,1,1-trichloroethane and chloroform was measured by the following method in accordance with the domestic water purifier test method specified in JIS S 3201 (2010).

  With respect to the treated water, 1,1,1-trichloroethane was prepared at a concentration of 0.300 ± 0.060 mg / L and chloroform was prepared at a concentration of 0.060 ± 0.012 mg / L, and two types of sample water were prepared. Then, 50 cc of each activated carbon of Examples 1 to 4 and Comparative Examples 1 to 4 was packed in a cylindrical column having an inner diameter of 40 mm and a height of 100 mm.

Each of the two types of sample water was passed through an activated carbon packed column at 20 ° C. and an SV value of 1200 hr ⁻¹ . The sample water flowing out from the activated carbon packed column was collected, and the concentration of 1,1,1-trichloroethane or chloroform was quantitatively measured using gas chromatography (manufactured by Shimadzu Corporation, gas chromatograph GC-2014).

  The sample water before passing through the column and the sample water that passed through the activated carbon layer of the column were compared. The point at which the concentration of 1,1,1-trichloroethane in the outflow-side sample water with respect to the inflow-side sample water was 20% or more was defined as a breakthrough point for the same substance. Moreover, the point where the concentration of chloroform in the outflow side sample water with respect to the inflow side sample water was 20% or more was determined as the breakthrough point of the same substance. And the value which divided the total effluent amount of the point which reached the breakthrough point by the filling volume of the said activated carbon was made into the filtration capability performance with respect to an adsorbent.

[Results and discussion of activated carbon for water purifiers]
From the results of Table 1 and Table 2, when the activated carbons for water purifiers of Examples and Comparative Examples were compared, there was no significant difference in the measured values of total pore volume and average pore diameter. Iodine adsorption performance, packing density, and benzene adsorption power generally have performance required for activated carbon for water purifiers in both Examples and Comparative Examples. From these points, the examples and comparative examples are satisfactory as ordinary activated carbons for water purifiers. However, a difference occurred in 1,1,1-trichloroethane filtration capacity and chloroform filtration capacity.

Focusing on the different measurement items, from Example 2, if the BET specific surface area is less than 900 m ² / g, the decrease in adsorption capacity is extremely undesirable. Therefore, the BET specific surface area 900 m ² / g is the lower limit. Further, from the viewpoint of stability of the adsorption capacity, 950 m ² / g or more is preferable from Example 1. Next, from the comparison between each Example and Comparative Example 3, the preferable upper limit of the BET specific surface area is 1100 m ² / g, and the more preferable upper limit is 1050 m ² / g from Example 3.

  In the analysis by the MP method, the total pore volume of pores having a pore diameter of 0 to 2.0 nm is relatively uniform in the activated carbon whose specific surface area approximates. However, another aspect arises when focusing on the total pore volume ratio of pores having a pore diameter of 0.6 nm or less as analyzed by the MP method. As in Comparative Example 1, in the case where the pore volume ratio was less than 40%, the filtration capacities of 1,1,1-trichloroethane and chloroform were lowered. From this, the ratio of 40% or more can be appropriate. Moreover, the filter capacity fall became clear also from the comparative example 4 which exceeded the same ratio 45%. Therefore, in the measurement of the pore distribution by the MP method, the total pore volume of pores having a pore diameter of 0.6 nm or less occupying the total pore volume of pores having a pore diameter of 0 nm to 2.0 nm is the total fine volume. 40% to 45% of the pore volume. Furthermore, a range of 43% to 44% is a better example than the numerical value of each example.

  According to the analysis of the DH method, since the range of the pore diameter to be targeted is wide, the total pore volume varies somewhat between the activated carbons. Even in such a case, whether or not the filtration ability of 1,1,1-trichloroethane and chloroform is judged is good by paying attention to the total pore volume ratio of pores having a pore diameter of 2.0 nm or less by the DH method. Can do. As in Comparative Examples 2 and 4, when the ratio of the pore volume of pores having a pore diameter of 2.0 nm or less is less than 20%, the filtering ability of 1,1,1-trichloroethane and chloroform is deteriorated as a whole. In addition, as in Comparative Examples 1 and 3, when the ratio of the pore volume exceeds 23%, the filtration ability of 1,1,1-trichloroethane and chloroform similarly deteriorates. Therefore, in the measurement of pore distribution by the DH method, the total pore volume of pores having a pore diameter of 2.0 nm or less occupying the total pore volume of pores having a pore diameter of 1 nm to 100 nm is the total fine volume. It converges to 20% to 23% of the pore volume.

  Regarding the result of the surface oxide amount, the lower limit of Example 4 and the upper limit of Example 1 can lead to a range of 0.05 to 0.14 meq / g, and further 0.06 to 0.13 meq / g. The upper limit can be defined from Comparative Examples 1 and 2.

  As described above, the specific surface area, the total pore volume ratio of pores having a pore diameter of 0.6 nm or less analyzed by the MP method, the total pore volume ratio of pores having a pore diameter of 2.0 nm or less by the DH method, surface oxidation It is extremely effective to grasp the filtration performance of organochlorine compounds such as 1,1,1-trichloroethane, chloroform, etc., taking into account each index of the quantity. Therefore, it was possible to further improve the filtration performance of the organic chlorinated compound of the activated carbon for the conventional water purifier.

[Creation of activated carbon cartridge]
About the activated carbon cartridge containing activated carbon for water purifiers, it created by the method of an indication to the schematic diagram of FIG. 85 parts by weight of activated carbon for water purifier of Example 1 (41), 10 parts by weight (42) of fibrous activated carbon (made by Phutamura Chemical Co., Ltd., trade name phenol-based fibrous activated carbon), acrylic fiber (made by Toyobo Co., Ltd., trade name) Bipal) 5 parts by weight (43) was weighed. The slurry was dispersed in water having a weight of about 20 times the solid content with stirring to obtain a slurry (40).

  A hollow cylindrical core member (44) made of polypropylene having an outer diameter of 24 mm, an inner diameter of 20 mm, a total length of 50 mm and pores having a diameter of 2 mm was prepared. A porous stainless steel metal rod member (45) is inserted and fixed in the hollow cylindrical core member (44), and is inserted into the slurry material (40). ) The solid content was drawn from the inside to deposit about 13 mm on the surface of the hollow cylindrical core member (44) to form the slurry-adhered portion (46). The die bar-like member (45) was removed from the hollow cylindrical core member (44) to obtain an adsorbed adherend (47) that was an integrated product of the slurry adherend (46) and the hollow cylindrical core member (44).

  The adsorbed adherend (47) was put in a dryer and heated and dried at 100 ° C. for 12 hours to prepare an activated carbon cartridge (40). The activated carbon cartridge (40) has an outer diameter of 50 mm, an inner diameter of 20 mm, and an overall height of 50 mm. The activated carbon cartridge is referred to as Example 5.

  By the same production method as the activated carbon cartridge produced using the activated carbon for water purifier of Example 1, only the activated carbon for water purifier was changed to the activated carbon of Comparative Example 1, and an activated carbon cartridge serving as a control product was also produced. This activated carbon cartridge is referred to as Comparative Example 5.

[Water flow test for activated carbon cartridge]
Measure the filtration capacity of 1,1,1-trichloroethane and chloroform in accordance with JIS S 3201 (2010) and the water purifier test method for home use for the activated carbon cartridges (Example 5 and Comparative Example 5). did.

For sample water to be used for measurement, 1,1,1-trichloroethane was prepared at a concentration of 0.060 ± 0.012 mg / L, and chloroform was prepared at a concentration of 0.300 ± 0.060 mg / L. The activated carbon cartridge was mounted on a stainless steel housing, and each of the two types of sample water was passed through the activated carbon cartridge at 20 ° C. and an SV value of 800 hr ⁻¹ . Sample water flowing out from the activated carbon cartridge was collected, and the concentration of 1,1,1-trichloroethane and chloroform was quantitatively measured using gas chromatography as described above.

  Compare the sample water before passing through the activated carbon cartridge with the sample water after passing, and the breakthrough rate of 1,1,1-trichloroethane in the outflow side sample water with respect to the inflow side sample water was 20% or more. The breakthrough point. Moreover, the point where the breakthrough rate of the outflow side sample water with respect to the inflow side sample water was 20% or more was defined as the breakthrough point of the same substance. And the value which divided the total effluent amount of the point which reached the breakthrough point by the filling volume of the said activated carbon was made into the filtration capability performance with respect to an adsorbent.

[Results and consideration of water flow test]
In the case of the activated carbon cartridge (Example 5) using activated carbon of Example 1, the water flow rate at the point where the breakthrough rate of 1,1,1-trichloroethane was 20% or more was 12.2 L / cc. The water flow rate at the point where the breakthrough rate was 20% or more was 12.7 L / cc.

  In the case of the activated carbon cartridge using the activated carbon of Comparative Example 1 (Comparative Example 5), the water flow rate at which the breakthrough rate of 1,1,1-trichloroethane was 20% or more was 6.9 L / cc, The water flow rate at the point where the breakthrough rate was 20% or more was 9.0 L / cc.

  From this result, it was demonstrated that the activated carbon for water purifiers having the physical properties of the present invention greatly improved the filtration ability of 1,1,1-trichloroethane and chloroform. Furthermore, even when an activated carbon cartridge is made using the activated carbon for purification of the present invention, there is no effect on the filtration ability of 1,1,1-trichloroethane and chloroform. Application to water treatment products can also be considered.

  Since the activated carbon for activated water and the activated carbon cartridge of the present invention have improved the filtration ability of 1,1,1-trichloroethane and chloroform among the organic chlorine compounds contained in water, the activated water cartridge and the activated carbon cartridge can improve the performance of the water purifier. In particular, it is suitable for high-precision filtration of a water purifier that has been required recently.

DESCRIPTION OF SYMBOLS 10, 30, 50 Activated carbon cartridge 11 Main body part 12 Cavity part 20 Water purifier 21 Switching part 23 Filtration chamber 25 Faucet 31 Water flow container 32 Water conduit 40 Slurry material 41 Activated carbon for water purifier 43 Acrylic fiber 47 Adsorbed adherend

Claims (3)

The specific surface area is 900-1100 m ² / g,
In the measurement of the pore distribution by the MP method, the total pore volume of pores having a pore diameter of 0 to 2.0 nm is 0.4110 cc / g or more and the total fineness of pores having a pore diameter of 0.6 nm or less is used. the pore volume as a 40 to 45% of the total pore volume,
In the measurement of pore distribution by the DH method, the total pore volume of pores having a pore diameter of 1 to 100 nm is 0.1244 cc / g or less, and the total pore volume of pores having a pore diameter of 2.0 nm or less was a 20 to 23% of the total pore volume,
It consists of activated carbon with a surface oxide amount of 0.05 to 0.14 meq / g,
Among activated carbon compounds, activated carbon for water purifiers, which has improved performance for removing chloroform and 1,1,1-trichloroethane. An activated carbon cartridge, which is formed into a predetermined shape with a binder added to the activated carbon for water purifier according to claim 1.   An activated carbon cartridge, wherein the activated carbon for a water purifier according to claim 1 is filled in a water passage container having a predetermined shape.

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