Molded adsorbent, and water purification cartridge

Abstract

Provided is a molded adsorbent in which shape retention is secured. A molded adsorbent (1) contains activated carbon (3) and a fibrous binder (7). The fibrous binder (7) is a mixture of a first fibrous binder (7A) and a second fibrous binder (7B) having a particle size distribution different from that of the first fibrous binder (7A). When the first fibrous binder (7A) is measured by a laser diffraction scattering type particle size distribution measuring device, the measured value obtained as a central particle diameter D50 is 80-300 μm inclusive, and when the second fibrous binder (7B) is measured by the laser diffraction scattering type particle size distribution measuring device, the measured value obtained as the central particle diameter D50 is 14-60 μm inclusive.

Description

Molded adsorbent and water purification cartridge

[0001] The present disclosure relates to molded adsorbents and water purification cartridges.

[0002] Patent Document 1 discloses a water treatment filter. The water treatment filter in Patent Document 1 includes a cylindrical filter containing particulate activated carbon and a fibrillated fibrous binder. The patent document describes an example in which only "Fibrillated Acrylic Pulp Bi-PUL / F" manufactured by Nippon Exlan Kogyo Co., Ltd. is used as the fibrous binder.

[0003] International Publication No. 2014 / 061740

[0004] Conventional molded adsorbents using fibrous binders sometimes crack when the molded adsorbent is dried. The present disclosure aims to provide a molded adsorbent that is inhibited from cracking when dried and that maintains its shape.

[0005] The molded adsorbent of the present disclosure is a molded adsorbent containing activated carbon and a fibrous binder, wherein the fibrous binder is a mixture of a first fibrous binder and a second fibrous binder having a particle size distribution different from that of the first fibrous binder, and wherein when the first fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value obtained as the median particle diameter D50 is 80 μm or more and 300 μm or less, and when the second fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value obtained as the median particle diameter D50 is 14 μm or more and 60 μm or less.

[0006] Fig. 2 is an explanatory diagram showing a schematic configuration of a molded adsorbent body; Fig. 3 is a front view of an example of a water purification cartridge equipped with a molded adsorbent body; Fig. 4 is a cross-sectional view of the water purification cartridge of Fig. 2; Fig. 5 is a frequency distribution curve for a fibrous binder, plotting particle diameter on the horizontal axis and frequency on the vertical axis; Fig. 6 is a cumulative distribution curve for a fibrous binder, plotting particle diameter on the horizontal axis and cumulative volume on the vertical axis.

[0007] First, embodiments of the present disclosure will be described. Any combination of the following embodiments without causing any contradiction is also included in the embodiments for carrying out the invention. [1] The present disclosure provides a molded adsorbent containing activated carbon and a fibrous binder, wherein the fibrous binder is a mixture of a first fibrous binder and a second fibrous binder having a particle size distribution different from that of the first fibrous binder. When the first fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value of the median particle diameter D50 is 80 μm or more and 300 μm or less. When the second fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value of the median particle diameter D50 is 14 μm or more and 60 μm or less. [2] In the molded adsorbent described in [1] above, the content of the activated carbon having a particle diameter of 10 μm or less is 12% by volume or less. [3] In the molded adsorbent according to any one of [1] and [2] above, the content of the fibrous binder having a particle diameter of 23.99 μm or less when measured by a laser diffraction / scattering particle size distribution analyzer is 11% by volume or more and 30% by volume or less. [4] A water purification cartridge according to the present disclosure comprises the molded adsorbent according to any one of [1] to [3] above.

[0008] Embodiments of the present disclosure will be described with reference to the drawings. In this specification, when a numerical range is described using "greater than or equal to" or "less than or equal to," the range includes both the lower limit and the upper limit unless otherwise specified. For example, the expression "10 or greater and 20 or less" includes both the lower limit "10" and the upper limit "20." Furthermore, in this specification, the upper and lower limits of each numerical range can be combined in any combination.

[0009] As shown in Figure 1, the formed adsorbent 1 of this embodiment contains activated carbon 3 and a fibrous binder 7. The formed adsorbent 1 may further contain one or more lead removal materials 5 selected from the group consisting of zeolite, titanium silicate, sodium titanate, aluminosilicate, and titanium oxide. Figure 1 is an explanatory diagram schematically showing the configuration of the formed adsorbent 1. The size, shape, and amount of each component are not limited thereto. The arrows in Figure 1 represent the flow of water purified by the formed adsorbent 1.

[0010] The activated carbon 3 can be obtained from any starting material. A specific example of the activated carbon 3 is activated carbon obtained by carbonizing at high temperature one or more materials selected from coconut shells, rice husks, coal, and phenolic resins and then activating them. The form of the activated carbon 3 is not particularly limited. The activated carbon 3 is, for example, in a granular form.

[0011] The activated carbon 3 is not particularly limited as long as the desired effect is not impaired. From the viewpoint of ensuring an initial flow rate, the central particle diameter D50 of the activated carbon 3 is preferably 16 μm or more, more preferably 19 μm or more, even more preferably 20 μm or more, and may be 25 μm or more. The central particle diameter D50 of the activated carbon 3 is typically 160 μm or less, and may be 90 μm or less, 60 μm or less, or 40 μm or less. From the viewpoint of improving the chloroform removal capacity, the central particle diameter D50 of the activated carbon 3 is preferably 27 μm or less, more preferably 26 μm or less, and even more preferably 25 μm or less. From these viewpoints, the central particle diameter D50 of the activated carbon 3 is preferably 16 μm or more and 27 μm or less, more preferably 19 μm or more and 26 μm or less, and even more preferably 20 μm or more and 25 μm or less.

[0012] From the viewpoint of improving the chloroform removal capability, the content of activated carbon 3 having a particle diameter of 10 μm or less is preferably 1 vol% or more, more preferably 3 vol% or more, even more preferably 5 vol% or more, and may be 7 vol% or more, or even 8 vol% or more. From the viewpoint of ensuring the initial flow rate, the content of activated carbon 3 having a particle diameter of 10 μm or less is preferably 15 vol% or less, more preferably 10 vol% or less, and even more preferably 8 vol% or less. From these viewpoints, the content of activated carbon 3 having a particle diameter of 10 μm or less is preferably 1 vol% or more and 15 vol% or less, more preferably 3 vol% or more and 10 vol% or less, and even more preferably 5 vol% or more and 8 vol% or less. The content of activated carbon 3 having a particle diameter of 10 μm or less means the volume fraction of activated carbon 3 having a particle diameter of 10 μm or less contained in 100 vol% of the total amount of activated carbon 3. Activated carbon 3 having a particle diameter of 10 μm or less has a particle diameter greater than 0 μm.

[0013] The median particle diameter D50 of the activated carbon 3 and the content of activated carbon 3 having a particle diameter of 10 μm or less can be measured by a laser diffraction / scattering type particle diameter distribution measuring device.

[0014] The median particle diameter D50 and particle size distribution of the activated carbon 3 can be controlled, for example, by appropriately selecting the particle diameter of the raw material activated carbon. When the activated carbon 3 is a mixture of activated carbons with different particle diameters, they may be controlled by adjusting the blending amounts of activated carbons with each particle diameter.

[0015] There are no particular limitations on the content of activated carbon 3. From the viewpoint of chloroform removal performance, the content of activated carbon 3 is 64% by mass or more and 96% by mass or less, more preferably 75% by mass or more and 94% by mass or less, and even more preferably 80% by mass or more and 92% by mass or less, based on 100% by mass of the molded adsorbent 1.

[0016] The fibrous binder 7 may be either a synthetic fiber or a natural fiber. The fibrous binder 7 is, for example, one or more fibers selected from the group consisting of acrylic fiber, polyethylene fiber, polypropylene fiber, polyacrylonitrile fiber, cellulose fiber, polyamide fiber, and aramid fiber. Among these, acrylic fiber is preferred. From the viewpoint of the shape retention of the molded adsorbent 1, the fibrous binder 7 is preferably fibrillated.

[0017] Conventional molded adsorbents use fibrous binders to maintain their shape. However, when the particle size of activated carbon is small, the amount of fibrous binder used is often insufficient to maintain the shape of the activated carbon, resulting in cracks. Increasing the amount of fibrous binder to maintain the shape reduces the density and loading of the activated carbon, raising concerns that its removal performance may also decline. After extensive research, the inventors of the present disclosure have developed a new technology that achieves both a sufficient loading amount of activated carbon and shape retention by mixing a fine-grained fibrous binder with a conventional fibrous binder.

[0018] It has been found that, in the technology of the present disclosure, the fibrous binders 7, 7A, and 7B can also be suitably evaluated by particle size distribution measurement, similar to the particle size distribution of the activated carbon 3. For this reason, the fibrous binders 7, 7A, and 7B of the present disclosure are defined by measured values ​​measured using a laser diffraction / scattering particle size distribution measuring device.

[0019] From the viewpoints of ensuring the shape retention of the molded adsorbent 1 and the loading amount of activated carbon 3, the fibrous binder 7 is preferably a mixture of a first fibrous binder 7A and a second fibrous binder 7B having a particle size distribution different from that of the first fibrous binder 7A. The first fibrous binder 7A and the second fibrous binder 7B may be the same type of fiber or different types of fibers as long as they have different particle size distributions. The first fibrous binder 7A and the second fibrous binder 7B are preferably the same type of fiber, and more preferably both are acrylic fibers. Such a second fibrous binder 7B can be obtained, for example, by subjecting the first fibrous binder 7A to a process for reducing the particle size. The process for reducing the particle size is, for example, a grinding process or a classification process.

[0020] When the first fibrous binder 7A is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value obtained as the median particle diameter D50 is 80 μm or more and 300 μm or less, preferably 90 μm or more and 200 μm or less, and more preferably 100 μm or more and 160 μm or less. When the second fibrous binder 7B is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value obtained as the median particle diameter D50 is 14 μm or more and 60 μm or less, preferably 18 μm or more and 40 μm or less, and more preferably 20 μm or more and 30 μm or less.

[0021] When the fibrous binder 7 is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value obtained as the median particle diameter D50 is preferably 50 μm or more and 140 μm or less, more preferably 70 μm or more and 130 μm or less, and even more preferably 90 μm or more and 120 μm or less.

[0022] When the fibrous binder 7 is measured using a laser diffraction / scattering particle size distribution analyzer, the content of the fibrous binder 7 having a measured particle diameter of 23.99 μm or less is preferably 11 vol% or more, more preferably 14 vol% or more, and even more preferably 16 vol% or more, from the viewpoint of improving the shape retention of the molded adsorbent 1. From the viewpoint of ensuring the initial flow rate, the content of the fibrous binder 7 having a measured particle diameter of 23.99 μm or less is preferably 30 vol% or less, more preferably 25 vol% or less, and even more preferably 20 vol% or less. From these viewpoints, the content of the fibrous binder 7 having a measured particle diameter of 23.99 μm or less is preferably 11 vol% or more to 30 vol%, more preferably 14 vol% or more to 25 vol% and even more preferably 16 vol% or more to 20 vol%. The content of the fibrous binder 7 having a measured particle diameter of 23.99 μm or less means the volume ratio of the fibrous binder 7 having a measured particle diameter of 23.99 μm or less contained in 100% by volume of the total amount of the fibrous binder 7. The fibrous binder 7 having a measured particle diameter of 23.99 μm or less has a measured particle diameter greater than 0 μm.

[0023] The ratio (mass ratio) of the first fibrous binder 7A to the second fibrous binder 7B is not particularly limited, and the mass ratio of the first fibrous binder 7A to the second fibrous binder 7B is preferably 5:5 to 9.9:0.1, more preferably 6:4 to 9.5:0.5, and even more preferably 7:3 to 9:1.

[0024] There are no particular limitations on the content of the fibrous binder 7. The content of the fibrous binder 7 is preferably 4% by mass or more and 12% by mass or less, more preferably 5% by mass or more and 11% by mass or less, and even more preferably 6% by mass or more and 10% by mass or less, based on 100% by mass of the molded adsorbent body 1.

[0025] The lead removal material 5 is not particularly limited as long as the desired effect is not impaired. The lead removal material 5 is, for example, one or more selected from the group consisting of zeolite, titanium silicate, sodium titanate, aluminosilicate, and titanium oxide, and among these, zeolite is preferred. The form of the lead removal material 5 is not particularly limited. The lead removal material 5 is, for example, in a particulate form.

[0026] The median particle diameter D50 of the lead removal material 5 is preferably 25 μm or more and 40 μm or less, more preferably 28 μm or more and 37 μm or less, and even more preferably 30 μm or more and 35 μm or less, from the viewpoint of ensuring water passage by matching the particle size of the second fibrous binder 7B. The median particle diameter D50 of the lead removal material 5 can be measured with a laser diffraction / scattering type particle size distribution measuring device.

[0027] There are no particular limitations on the content of the lead removal material 5. When the molded adsorbent 1 is taken as 100% by mass, the content of the lead removal material 5 is preferably 2.5% by mass or more and 32% by mass or less, more preferably 3.0% by mass or more and 20% by mass or less, and even more preferably 4.5% by mass or more and 12% by mass or less.

[0028] The pressure loss of the formed adsorbent 1 is preferably 0.07 MPa or more and 0.15 MPa or less. A formed adsorbent 1 with such a pressure loss is practical. The pressure loss refers to the pressure loss at a flow rate of 1.5 L / min when water is passed from the outer peripheral surface to the inner peripheral surface of a cartridge filter having an outer diameter of 24.4 mm, an inner diameter of 8.1 mm, and a length of 90.0 mm and a filtration volume of 37.4 mL.

[0029] The density of the molded adsorbent 1 is 0.28 g / cm ３ 0.45g / cm or more ３ It is preferable that the density is 0.35 g / cm or less. ３ 0.43g / cm or more ３ More preferably, it is 0.38 g / cm or less. ３ 0.41g / cm or more ３ The density of the molded adsorbent body 1 is determined by multiplying the mass (g) of the molded adsorbent body 1 by the volume (cm ３ ) refers to the apparent density calculated based on

[0030] The water purification cartridge 11 of this embodiment includes a molded adsorbent 1. The shape and structure of the water purification cartridge 11 are not particularly limited. As shown in Figures 2 and 3, one example of the water purification cartridge 11 is cylindrical. This water purification cartridge 11 includes a core 12, a molded adsorbent 1, a nonwoven fabric 14, and sealing caps 15 and 16. The core 12 is cylindrical and is located at the innermost part of the water purification cartridge 11. The core 12 has pores formed therein that allow water to pass from the outside to the inside, and a flow path 20 is formed therein. Any material can be used for the core 12. Examples of materials for the core 12 include porous ceramic, a porous metal filter, and a hard nonwoven fabric.

[0031] The molded adsorbent 1 in one example has a cylindrical shape and is disposed on the outer peripheral surface of the core 12. The nonwoven fabric 14 is disposed on the outer peripheral surface of the molded adsorbent 1. For example, the nonwoven fabric 14 may be a nonwoven fabric specified in JIS L0222. The type of fiber used as the raw material for the nonwoven fabric 14 is not particularly limited.

[0032] The sealing cap 15 covers one end of the molded adsorbent 1, thereby closing one side of the flow path 20. The sealing cap 16 covers the other end of the molded adsorbent 1. The sealing cap 16 is formed with an outlet 60 through which water that has flowed through the flow path 20 is discharged.

[0033] There are no particular limitations on the manufacturing method of the water purification cartridge 11. The manufacturing method of the water purification cartridge 11 includes, for example, a mixing step, a suction molding step, a drying step, a surface polishing step, a nonwoven fabric winding step, and a sealing step.

[0034] The mixing step involves mixing particulate matter containing at least activated carbon 3, a fibrous binder 7, and water to obtain a slurry. The suction molding step involves molding a molded adsorbent 1. For example, the suction molding step includes sealing the other end of the flow path 20 of the core 12 and connecting one end of the flow path 20 of the core 12 to a suction pump via a hose; immersing the core 12 connected to the suction pump in the above-mentioned slurry stored in a container; and operating the suction pump. The water in the slurry permeates the core 12, and the mixture of particulate matter and binder remains on the surface of the core 12 and gradually accumulates. The water in the slurry sucked into the suction pump is discharged through a drainage channel. Operating the suction pump allows the molded adsorbent 1 to be formed to a specified thickness.

[0035] The drying step dries the formed adsorbent body 1 formed in the suction forming step. The surface polishing step polishes the outer peripheral surface of the formed adsorbent body 1. The nonwoven fabric winding step winds nonwoven fabric 14 around the outer peripheral surface of the formed adsorbent body 1 polished in the surface polishing step. The sealing step attaches sealing cap 15 to one end of the formed adsorbent body 1 wrapped with nonwoven fabric 14, and sealing cap 16 to the other end.

[0036] As described above, the molded adsorbent 1 of this embodiment is a molded adsorbent containing activated carbon 3 and a fibrous binder 7, where the fibrous binder 7 is a mixture of a first fibrous binder 7A and a second fibrous binder 7B having a particle size distribution different from that of the first fibrous binder 7A. When the first fibrous binder 7A is measured using a laser diffraction / scattering particle size distribution analyzer, the measured value of the median particle diameter D50 is 80 μm or more and 300 μm or less. When the second fibrous binder 7B is measured using the laser diffraction / scattering particle size distribution analyzer, the measured value of the median particle diameter D50 is 14 μm or more and 60 μm or less. The molded adsorbent 1 of this embodiment can improve the shape retention of the molded adsorbent 1, for example, compared to a molded adsorbent containing only the first fibrous binder 7A as the fibrous binder. The molded adsorbent 1 uses a combination of activated carbon 3 and fibrous binder 7, thereby ensuring the chloroform removal capacity and initial flow rate required for the molded adsorbent 1.

[0037] Experimental Examples 4, 5, 6, 10, and 11 are working examples, and Experimental Examples 1, 2, 3, 7, 8, and 9 are comparative examples. In Table 1, "*" indicates a comparative example.

[0038] The molded adsorbents of each experimental example were prepared as follows: First, the experimenter prepared a slurry at the following blend ratio so that the total amount of activated carbon, lead removal material, and fibrous binder was 100% by mass. The amount of fibrous binder is the total amount of the first fibrous binder and the second fibrous binder. <Slurry Blend Ratio> Activated carbon: 80% by mass to 92% by mass Lead removal material: 4.5% by mass to 12% by mass Fibre binder: 6% by mass to 10% by mass

[0039] Details of each component are as follows: Activated carbon: granular activated carbon having the particle size distribution shown in Table 1. Lead removal material: zeolite (BASF Japan ATS) ＴＭMEDIA NSF / ANSI61 D50 = 29 μm. Fibrous binder: A mixture of the following first and second fibrous binders in the mass ratio shown in Table 1, which exhibits the particle size distribution shown in Table 1 when measured using a laser diffraction / scattering particle size distribution analyzer. The values ​​shown in the "mass ratio" column in Table 1 indicate the content (mass %) of each component when the molded adsorbent is taken as 100 mass %. First fibrous binder: Toyobo Co., Ltd., Japan Exlan Industrial Co., Ltd. Bi-PUL 50 TWF (fibrillated acrylonitrile fiber). The measured D50 is 131.5 μm. Second fibrous binder: A fibrous binder obtained by pulverizing and classifying the first fibrous binder to adjust the measured D50 to 25 μm.

[0040] FIG. 4 is a frequency distribution curve for a fibrous binder, plotting particle diameter (μm) on the horizontal axis and frequency (%) on the vertical axis. FIG. 5 is a cumulative distribution curve for a fibrous binder, plotting particle diameter (μm) on the horizontal axis and cumulative volume (%) on the vertical axis. The distribution curve for the first fibrous binder is the curve for "Sample A." The distribution curve for the second fibrous binder is the curve for "Sample B." The distribution curve for the fibrous binder used in Experimental Example 5, whose measured D50 was 116.61 μm, is the curve for "Sample 1." The distribution curve for the fibrous binder used in Experimental Example 6, whose measured D50 was 105.37 μm, is the curve for "Sample 2." The distribution curve of the fibrous binder used in Experimental Examples 10 and 11, which had a measured D50 of 82.53 μm, is the curve of "Sample 3." The distribution curve of the fibrous binder used in Experimental Example 4, which had a measured D50 of 51.5 μm, is the curve of "Sample 4."

[0041] Details of the particle size distribution measuring device and measurement conditions are as follows. Particle size distribution measurement was performed in a wet manner. The particle size of each substance in the solvent does not change even after drying in the formed adsorbent. The particle size distribution of each substance in the solvent reflects the particle size distribution of each substance in the formed adsorbent after drying. The results are shown in Table 1. Laser diffraction / scattering type Particle size distribution measuring device: Microtrac MT3300EXII Distribution: Volume Solvent: Water Scale division: Particle size from 0.021 μm to 2000 μm Number of channels: 132

[0042]

[0043] Next, the experimenter attached a ceramic core (outer diameter 8.1 mm, inner diameter 5.0 mm) to the molding machine, sucked it into the slurry, and molded a molded adsorbent. The size of the molded adsorbent was set to an outer diameter of 24.4 mm, an inner diameter of 8.1 mm, and a length of 90 mm. The experimenter dried and polished the molded adsorbent, wrapped it in nonwoven fabric, and attached a cap to create a water purification cartridge. The density (g / cm) of each molded adsorbent was measured. ３ ) was determined by measuring the mass (g) of the formed adsorbent body and calculating the volume of the formed adsorbent body as 37.4 cm ３ The results are shown in Table 1.

[0044] The initial flow rate was evaluated in accordance with JIS S3201 6.1 "Filtration Flow Rate Test" as follows. An unused water purification cartridge from each experimental example was attached to the housing, and raw water was continuously passed through at SV = 2400 / h (1.5 L / min) for 10 minutes. Then, while continuing to pass water, the pressure gauge was adjusted to 0.1 MPa, and the flow rate (LPM, L / min) at that time was measured. The results are shown in Table 1.

[0045] Chloroform removal performance was evaluated in accordance with JIS S3201 as follows. Test water with a chloroform concentration of 60 ppb was prepared. The water purification cartridge of each experimental example was attached to the housing, and water was passed through at SV = 2400 / h (1.5 L / min). The cumulative amount of water passed (L) until the removal rate of the filtered water relative to the raw water reached 80% was measured. The results are shown in Table 1.

[0046] The results of the experimental examples are as follows. Experimental Examples 4, 5, 6, 10, and 11 satisfy all of the following requirements a, b, and c. In contrast, Experimental Examples 1, 2, 3, 7, 8, and 9 do not satisfy requirement b. Experimental Examples 1, 3, 7, 8, and 9 also do not satisfy requirement c. Requirement a: Contains activated carbon and a fibrous binder. Requirement b: The fibrous binder is a mixture of a first fibrous binder and a second fibrous binder having a particle size distribution different from that of the first fibrous binder, and when the first fibrous binder is measured with a laser diffraction / scattering particle size distribution measuring device, the measured value obtained as the median particle diameter D50 is 80 μm or more and 300 μm or less, and when the second fibrous binder is measured with the laser diffraction / scattering particle size distribution measuring device, the measured value obtained as the median particle diameter D50 is 14 μm or more and 60 μm or less. Requirement c: It is possible to form a molded adsorbent by molding.

[0047] In Experimental Examples 4, 5, 6, 10, and 11, the molded adsorbents were free of cracks and had good shape retention. In Experimental Examples 4, 5, 6, 10, and 11, the chloroform removal performance was 1,390 L or more and the initial flow rate was 1.05 LPM or more. In these Experimental Examples, the shape retention of the molded adsorbent was improved, and the chloroform removal capacity and initial flow rate required for a molded adsorbent were ensured.

[0048] Among Experimental Examples 4, 5, 6, 10, and 11, Experimental Examples 4, 5, and 6 also satisfy the following requirement d: Requirement d: The content of activated carbon having a particle diameter of 10 μm or less is 12% by volume or less.

[0049] The initial flow rate was 1.50 LPM or more in Experimental Examples 4, 5, and 6. It was found that when the above requirement d is satisfied, an even higher initial flow rate can be ensured.

[0050] DESCRIPTION OF SYMBOLS 1...molded adsorbent, 3...activated carbon, 5...lead removal material, 7...fibrous binder, 7A...first fibrous binder, 7B...second fibrous binder, 11...water purification cartridge, 12...core, 14...nonwoven fabric, 15...sealing cap, 16...sealing cap, 20...flow path, 60...discharge port

Claims

1. A molded adsorbent containing activated carbon and a fibrous binder, wherein the fibrous binder is a mixture of a first fibrous binder and a second fibrous binder having a particle size distribution different from that of the first fibrous binder, wherein the first fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, and the median particle diameter D50 of the first fibrous binder is 80 μm or more and 300 μm or less, and the second fibrous binder is measured using a laser diffraction / scattering particle size distribution analyzer, and the median particle diameter D50 of the second fibrous binder is 14 μm or more and 60 μm or less.

2. The molded adsorbent according to claim 1, wherein the content of said activated carbon having a particle size of 10 μm or less is 12% by volume or less.

3. A molded adsorbent described in any one of claims 1 and 2, wherein the content of the fibrous binder having a particle diameter measurement value of 23.99 μm or less when the fibrous binder is measured using a laser diffraction / scattering particle size distribution measuring device is 11 volume % or more and 30 volume % or less.

4. A water purification cartridge comprising the molded adsorbent according to any one of claims 1 to 3.

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