KR20130077686A - Activated carbon sheet, filter cartridge for water purification using the same and manufacturing method thereof - Google Patents

Abstract

PURPOSE: An activated charcoal sheet is provided to have excellent water flux and removal property of residual chlorine, and less pressure loss without a drop-out of the activated charcoal sheet. CONSTITUTION: An activated charcoal sheet (10) comprises: a nonwoven fiber layer (11), and an activated charcoal slurry coating layer formed on a side or both sides of the nonwoven fiber layer. The activated charcoal sheet comprises: a first nonwoven fiber layer; an activated charcoal slurry coating layer formed on a side of the first nonwoven fiber layer; and a second nonwoven fiber layer formed on the activated charcoal slurry coating layer.

Description

Activated carbon sheet, activated carbon filter cartridge for water purification using the same and manufacturing method thereof {Activated Carbon Sheet, Filter Cartridge for Water Purification Using the Same and Manufacturing Method

The present invention relates to an activated carbon sheet, an activated carbon filter cartridge for water purification using the same, and a method for manufacturing the same, and more particularly, by preparing activated carbon in a slurry form and coating the same on a nonwoven fabric, the amount of water flow and residual chlorine removal without the elimination of activated carbon The present invention relates to an activated carbon sheet having excellent excellent pressure loss and extended filter life, an activated carbon filter cartridge for water purification using the same, and a method of manufacturing the same.

Activated carbon has long been used as a typical adsorbent since it has various pore structure. Activated carbon can remove chlorine, organic substances, all organic halogens including trihalomethanes, organic carbon that can be biologically produced by ozone treatment, and substances causing taste and odor. Currently, activated carbon is used for industrial waste gas treatment, volatile solvent recovery, deodorization, toxic organics removal in water treatment, and recently, it is also used for advanced water treatment in water purification plants or pre-treatment adsorption filters in domestic water purifiers. It is gradually expanding.

Activated carbon has a specific surface area of 500-2000 m ² / g on average, and its high surface area makes it an effective adsorbent. Activated carbon can also be divided into powder, granular and fibrous according to particle size and shape. The size of powdered activated carbon is usually 1 to 150 microns, granular activated carbon has a particle size of 0.5 to 4 millimeters, and the fibrous activated carbon has a length of several hundreds of micrometers to several mm and a diameter of 10 to 20 micrometers. In general, fibrous activated carbon has a relatively higher specific surface area than powder and granular particles, and since the pores involved in adsorption are mostly exposed on the fiber surface, the adsorption and desorption rates are faster than those of granular or powdered activated carbon. However, there is a disadvantage in that the packing density is low and the adsorption amount per unit volume is small. On the other hand, granular or powdered activated carbon has a high adsorption amount per unit volume and excellent chlorine removal rate, but has a problem of low water flow rate or increased pressure loss.

Filters for water purification using conventional activated carbon are known from Patent Literatures 1 to 5 and the like. For example, Patent Literature 1 discloses a technique of adsorbing a slurry composed of granular activated carbon and an acrylic fiber binder onto a nonwoven fabric and manufacturing an activated carbon filter molded body through drying. Patent Document 2 discloses a technique relating to an activated carbon filter formed article in which a binder and a polyamide resin are mixed with a mixture of granular activated carbon and powdered activated carbon. On the other hand, Patent Literature 3 discloses a technique of crushing activated carbon fibers to produce a filter filler. Patent Literature 4 discloses a technique for producing a porous molded article in which a zeolite carrying activated carbon and a metal ion is solidified with a low melting point polymer as a binder. Patent Literature 5 discloses a technique for producing a filter for water treatment, which is mixed with at least two kinds of activated carbon and bonded with a porous polymer binder having a predetermined diameter.

Conventional techniques described above are usually produced by mixing activated carbon alone or two or more kinds of activated carbon with a binder, forming a tube or cylinder through heat treatment, and then wrapping the inner and outer surfaces of the tube with a nonwoven fabric. . However, such a block-shaped carbon filter has a problem in that the pore distribution is symmetrically configured, and therefore, the pressure loss is increased to shorten the lifetime, or the channel removal phenomenon lowers the chlorine removal rate, thereby deteriorating the purification performance of the water.

Accordingly, the present inventors have tried to produce a carbon filter for water purification having a simple manufacturing process, low manufacturing cost, low pressure loss, high water flow rate and chlorine removal rate, and as a result, activated carbon slurry having various particle shapes on the sheet of nonwoven fabric type. If the non-woven fabric is laminated on the coating layer after coating and drying, and the activated carbon sheet is manufactured by heat treatment, there is no risk of dropping activated carbon as compared to a conventional carbon block type filter, and a high water flow rate and a small pressure loss, thereby extending the filter. It was confirmed that the life and completed the present invention.

Korean Patent No. 341240 Korean Patent No. 843576 Korean Patent No. 473755 Japanese Laid-Open Patent Publication No. 2006-095517 Japanese Unexamined Patent Publication No. 2010-104974

An object of the present invention is to prepare an activated carbon in the form of a slurry and then coating it on a nonwoven fabric, thereby providing an activated carbon sheet having excellent water flow rate and residual chlorine removal characteristics without deactivation of activated carbon, and also having low pressure loss and extended filter life. It is.

Another object of the present invention is to provide an activated carbon filter cartridge for water purification using the activated carbon sheet.

Still another object of the present invention is to provide a method for producing the activated carbon sheet.

Activated carbon sheet according to an embodiment of the present invention for achieving the above object is a nonwoven fabric layer; And an activated carbon slurry coating layer formed on one or both surfaces of the nonwoven fabric layer.

Activated carbon sheet according to another embodiment of the present invention comprises a first nonwoven fabric layer; An activated carbon slurry coating layer formed on one surface of the nonwoven fabric layer; And a second nonwoven fabric layer formed on the activated carbon slurry coating layer. At this time, it is preferable that the first nonwoven fabric layer is a fine island nonwoven fabric layer and the second nonwoven fabric layer is a Taeseo island nonwoven fabric layer.

The activated carbon slurry coating layer is formed by coating a slurry including activated carbon, a surfactant, and a dispersant and then drying.

The activated carbon preferably has a specific surface area of 500 m ² / g or more and an iodine adsorption amount of 950 m ² / g or more.

The surfactant is preferably an anionic polymer surfactant, a cationic polymer surfactant or a mixture thereof.

The anionic polymer surfactant is preferably at least one selected from the group consisting of polyacrylic acid (PAA), polystyrenesulfonate (PSS) and polyacrylamide (PAM).

The cationic polymer surfactant is preferably at least one selected from the group consisting of polyethyleneimine (PEI), polyarylamine hydrochloride (PAH) and polydiaryldimethylammonium chloride (PDADMAC).

The dispersant is preferably at least one selected from the group consisting of low melting polyethylene short fibers, polyester short fibers and cellulose based short fibers.

The slurry preferably contains 0.1 to 10% by weight of activated carbon, 0.1 to 0.5% by weight of surfactant, 1 to 5% by weight of dispersant, and a residual amount of solvent.

The activated carbon filter cartridge for water purification of the present invention uses the activated carbon sheet.

Method for producing an activated carbon sheet of the present invention comprises the first step of preparing a slurry comprising 0.1 to 10% by weight of activated carbon, 0.1 to 0.5% by weight of surfactant, 1 to 5% by weight of a dispersant, and the remaining amount of solvent; A second step of coating the prepared slurry on a nonwoven fabric; And a third step of drying and heat treating the slurry coated nonwoven fabric.

After the second step may further comprise the step of laminating the nonwoven fabric again on the slurry coated on the nonwoven fabric.

The first step of preparing the slurry, the first-first step of mixing the activated carbon dispersion dispersed in a solvent with a cationic surfactant; Step 1-2 adding an anionic surfactant to the dispersion of the activated carbon, cationic surfactant; And adding the dispersant to the activated carbon, cationic surfactant and anionic surfactant dispersion.

As described above, the activated carbon sheet of the present invention has a simple manufacturing process and uses activated carbon having a variety of shapes in the form of a sheet coated on a nonwoven fabric, so the pressure loss is small, the service life is extended, and the flow rate and removal efficiency are excellent. There is a characteristic.

The filter composed of the activated carbon sheet of the present invention manufactured as described above can be used as RO pretreatment filter of water direct type water purifier and household water purifier because there is no risk of dropping activated carbon, and it is also suitable for general high water treatment field.

1 is a schematic cross-sectional view of an activated carbon sheet according to an embodiment of the present invention,
2 is a schematic cross-sectional view of an activated carbon sheet according to another embodiment of the present invention,
3 is a schematic cross-sectional view of an activated carbon sheet according to still another embodiment of the present invention.

[Activated carbon sheet]

Hereinafter, an activated carbon sheet according to the present invention will be described with reference to the accompanying drawings.

1 is a schematic sectional view of an activated carbon sheet according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view of an activated carbon sheet according to another embodiment of the present invention. Referring to FIG. 1, the activated carbon sheet 10 according to an embodiment of the present invention includes nonwoven fabric layers 11 and 21; And an activated carbon slurry coating layer 12 formed on one surface of the nonwoven fabric layer.

2, the activated carbon sheet 20 according to another embodiment of the present invention comprises a nonwoven fabric layer 21; And activated carbon slurry coating layers 22 and 22` formed on both sides of the nonwoven fabric layer.

In embodiments according to the present invention, the boundary between the nonwoven fabric layer and the activated carbon coating layer does not necessarily need to be clearly defined. For example, as shown in FIGS. 1 and 2, the activated carbon coating layers 11 and 21 are partially formed. May be penetrated into the nonwoven fabric layers 12, 22, and 22 ′.

3 is a schematic cross-sectional view of an activated carbon sheet according to still another embodiment of the present invention. 3, the activated carbon sheet 30 according to another embodiment of the present invention includes a first nonwoven fabric layer 31; An activated carbon slurry coating layer 32 formed on one surface of the first nonwoven fabric layer; And

And a second nonwoven fabric layer 31 ′ formed on the activated carbon slurry coating layer. In this case, the first nonwoven fabric layer 31 and the second nonwoven fabric layer 31 'may use the same kind of nonwoven fabric; Alternatively, the activated carbon sheet may be manufactured using non-woven fabrics of different fineness in a manner that the first nonwoven fabric layer 31 uses a fine-grained nonwoven fabric, and the second nonwoven fabric layer 31 ′ uses a fine-grained nonwoven fabric. . The production of activated carbon sheets using non-woven fabrics of different fineness has the additional advantage of minimizing pressure loss.

In the above embodiments according to the present invention, the nonwoven fabric applied to the nonwoven fabric layer, which is one component of the activated carbon sheet, is not particularly limited in its material, and nonwoven fabrics having various fineness and density can be used and the mechanical strength is 5 MPa or more. There is no big problem. Electrostatic nonwovens may also be used to enhance the adhesion between the slurry and the nonwoven.

In the above embodiments, the activated carbon slurry coating layer is formed by coating and then drying a slurry including activated carbon, a surfactant, and a dispersant.

The activated carbon can be divided into powder, granular and fibrous form depending on particle size and shape. The activated carbon has a specific surface area of 500 to 2000 m ² / g on average and can be used as an effective adsorbent due to this high surface area. The activated carbon used in the present invention is used for removing the fine substance including residual chlorine and extending the life, depending on the size or shape, any of the powder, granular and fibrous can be used. However, the specific surface area is preferably 500m ² / g or more, and particularly 950m ² / g or more based on the iodine adsorption amount is advantageous for enhancing the adsorption performance and extending the filter life.

The fibrous activated carbon has a diameter of 10 to 20 µm and a length ranging from 100 µm to 10 mm, and is a fibrous activated carbon having a specific surface area of 700 to 2000 m ² / g. The fibrous activated carbon generally has a relatively higher specific surface area than powder and granular particles, and since the pores involved in adsorption are mostly exposed on the fiber surface, the adsorption and desorption rate of residual chlorine or other odorous substances in raw water is increased. Compared to the very fast features. However, there are disadvantages in that the filling density is low and the amount of adsorption per unit volume is small. Meanwhile, the granular activated carbon of the present invention has a particle size of 0.5 to 4 mm, a specific surface area of 700 to 2000 m ² / g, and the powdered activated carbon usually has a size of 1 to 150 μm and a specific surface area of 700 to 2000 m ² / g.

The above-mentioned activated carbon is prepared in a slurry form using a suitable solvent, coated on a nonwoven fabric layer, and then dried to form a slurry coating layer. The solvent used for this purpose is not particularly limited, but alcohol, water and the like are preferably used. The weight ratio of activated carbon in the slurry is preferably 0.1 to 10% by weight based on the total weight of the slurry. If the content of activated carbon in the slurry is less than 0.1% by weight, the filling rate is low, and the removal rate is low. At this time, the composition ratio of each activated carbon is preferably 1: 1: 2 in the weight ratio of fibrous: granular: powdery for expressing desirable performance. In addition, the present invention may vary the composition ratio according to the user's needs or applications.

To the slurry is added a polymeric surfactant. The polymer surfactant functions to aggregate the activated carbon particles and to improve the strength of the aggregated activated carbon.

As the polymeric surfactant for the above purpose, anionic polymeric surfactants, cationic polymeric surfactants or mixtures thereof can be used.

The cationic surfactant added to the slurry is polyethyleneimine (PEI), polyarylamine hydrochloride (PAH), polydiaryldimethylammonium chloride (PDADMAC) and the like, and preferably polydiaryldimethylammonium chloride (PDADMAC). . Anionic surfactants are polyacrylic acid (PAA), polystyrenesulfonate (PSS), polyacrylamide (PAM), and preferably polyacrylamide (PAM). The weight average molecular weight of the polymer in the surfactant is preferably in the range of 50,000 to 1,000,000. If the weight average molecular weight is less than 50,000, the aggregation between activated carbon and the surfactant is not sufficient, and if the molecular weight exceeds 1,000,000, uniform dispersion is difficult.

The content of the polymeric surfactant in the slurry is preferably 0.1 to 0.5% by weight of the total weight of the slurry. If the surfactant content is less than 0.1% by weight, the aggregation between activated carbon and the surfactant does not occur well, and when the content exceeds 0.5% by weight, the aggregation between the surfactants and micelles are not preferable.

Preferably, the mixture of the cationic and anionic surfactants is used to make the aggregated activated carbon more uniformly dispersed in the slurry. At this time, the molar ratio is preferably 1: 1.5 as the molar ratio, and when the molar ratio exceeds 1: 1, there is no problem.

On the other hand, the dispersant in the composition of the slurry is to improve the uniform dispersion of the activated carbon aggregates and the adhesion between the nonwoven fabric and the overall strength of the activated carbon sheet after drying and heat treatment, the amount of the dispersant is preferably 1 to 5% by weight of the total slurry solution. . If the content of the dispersant is less than 1% by weight, it is difficult to uniformly disperse activated carbon, and if it is 5% by weight or more, the mechanical strength is not uniform. Representative dispersants include low melting polyethylene short fibers, polyester short fibers, cellulose short fibers and the like, and preferably cellulose short fibers.

[Production method of activated carbon sheet]

Method for producing an activated carbon sheet of the present invention comprises the steps of preparing a slurry comprising activated carbon, a surfactant and a dispersant; A second step of coating the prepared slurry on a nonwoven fabric; And a third step of drying and heat treating the slurry coated nonwoven fabric. After the second step may further comprise the step of laminating the nonwoven fabric again on the slurry applied to the nonwoven fabric.

In the first step of the preparation method of the present invention, a slurry including 0.1 to 10% by weight of activated carbon, 0.1 to 0.5% by weight of surfactant, 1 to 5% by weight of dispersant, and a residual amount of solvent is prepared. Each of the compositions of the slurry is as described above.

In the slurry preparation step, the activated carbon dispersion liquid primarily dispersed in a solvent such as water is sufficiently mixed with the cationic surfactant (Step 1-1). Mixing is usually carried out through stirring, the stirring speed is in the range of 100 to 1000rpm and the stirring time is preferably 30 to 100 minutes. If the stirring speed is less than 100rpm or more than 1000rpm, the dispersion is nonuniform, resulting in non-uniform aggregation with the anionic surfactant added later, resulting in a lowered removal performance of the produced activated carbon sheet.

After the addition of the anionic surfactant to the sufficient dispersion through the same stirring as described above (step 1-2). At this time, when the surfactant is added to the activated carbon aqueous solution dispersed in water at the same time, precipitation occurs, which makes it more difficult to disperse the activated carbon. Therefore, it is preferable to add the surfactant after about 5 minutes or more. The cation and anionic surfactants added are preferably 1: 1.5 in molar ratio for sufficient aggregation and uniform dispersion between the cation and anionic surfactants.

Finally, the dispersant solution prepared separately is sufficiently mixed with the activated carbon aqueous solution to complete the slurry (step 1-3). The dispersant solution is composed of a dispersant such as cellulose short fibers or pulp and a solvent such as water, and the content of the dispersant is preferably 1 to 5% by weight based on the total weight of the slurry. If the content of the dispersant is less than 1% by weight, it is difficult to uniformly disperse activated carbon, and if it exceeds 5% by weight, the mechanical strength is not uniform.

The second step of the production method of the present invention is the step of coating the prepared slurry on a nonwoven fabric. In this case, a known method may be applied as the coating method. For example, a spraying method, a coating method, an impregnation method, a casting method, a vacuum method, and the like are all possible, and the present invention is not limited to the above coating method. For example, in the vacuum method, the slurry may be adsorbed and coated by applying a vacuum to a cylindrical nonwoven fabric having a vacuum means connected to the activated carbon slurry solution. Thereafter, the activated carbon slurry is coated on the nonwoven fabric, and then squeezed through a rolling, calendering, and floating process to remove a large amount of moisture present on the slurry or nonwoven fabric, thereby making a sheet of a desired shape.

The third step of the production method of the present invention is a step of drying and heat-treating the slurry coated nonwoven fabric. The drying may induce drying of the remaining moisture and adhesion between the slurry and the nonwoven fabric by means such as hot air or infrared rays within a range of 80 to 150 ° C. In this case, if the drying temperature is less than 80 ℃ and the moisture removal is not enough and exceeds 150 ℃ may be uneven coating layer. In addition, the drying time is preferably 30 to 120 minutes. After the heat treatment is performed to increase the adhesion between the dried activated carbon slurry and the nonwoven fabric, the heat treatment temperature is preferably in the range of 100 to 300 ℃. If the heat treatment temperature is less than 100 ℃ the interfacial adhesion between the non-woven fabric and the slurry is not enough may cause the desorption of carbon during bending, if it exceeds 300 ℃ it may lead to a decrease in water flow rate by partial melting of the non-woven fabric.

After the second step may further comprise the step of laminating the nonwoven fabric again on the slurry coated on the nonwoven fabric. The three-layered configuration can prevent activated carbon from falling off and improve adhesion between the slurry and the nonwoven layer. At this time, it is more preferable that the added nonwoven fabric exceeds the fineness of the nonwoven fabric having the slurry coating layer for increasing water flow rate and reducing pressure loss.

Activated carbon sheet produced after the heat treatment can be used as a filter cartridge of the bent form or wound filter cartridge, etc.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is described in more detail with reference to the following Examples. However, the scope of the present invention is not limited to these Examples.

< Example  1>

2 g of powdered activated carbon (D company, iodine adsorption power; 950 mg / g), 1 g of granular activated carbon (D company, iodine adsorption power; 950 mg / g), 1 g of fibrous activated carbon (D company, iodine adsorption power; 1000 mg / g) Was dispersed at a stirring speed of 500 rpm. 0.1 g of PDADMAC (A, Mw; 350,000) was added thereto and uniformly dispersed. Thereafter, after stirring for about 10 minutes, 0.15 g of PAM (A company, Mw; 4,000,000) was added to obtain an activated carbon aggregation solution. On the other hand, the cellulose short fibers were opened by cotton (D company) to disperse 3g in 100g of water and then combined with the activated carbon slurry solution to prepare a uniform activated carbon slurry through a stirring speed of 800rpm.

Thereafter, the prepared slurry solution was pressurized to 1 atm on one surface of a nonwoven fabric (W company, density 15 g / m ² , thickness 130 μm) to obtain a nonwoven fabric filter in which activated carbon slurry was adsorbed. After drying for 60 minutes at 100 ℃, heat treatment for 30 minutes at 180 ℃ to prepare an activated carbon sheet.

< Example  2>

Slurry liquid was prepared using the same procedure as in Example 1. The slurry solution was applied on one side of a nonwoven fabric (W company, density 15 g / m ² , thickness 130 μm), and a uniform slurry coating layer was formed using a casting knife (100 μm thickness). Thereafter, drying and heat treatment were performed under the same conditions as in Example 1 to prepare an activated carbon sheet.

< Example  3>

Slurry liquid was prepared using the same procedure as in Example 1. The activated carbon slurry was impregnated with a nonwoven fabric (W company, density 15 g / m ² , thickness 130 μm), taken out, and both sides were pressed with paper to prepare a slurry coated nonwoven fabric. Thereafter, drying and heat treatment were performed under the same conditions as in Example 1 to prepare an activated carbon sheet.

 < Example  4>

The activated carbon layer on the activated carbon sheet prepared in Example 2 was covered with a second nonwoven fabric (W company, density of 50 g / m 2, thickness of 500 μm), followed by heat treatment at 180 ° C. for 30 minutes to prepare an activated carbon sheet having a multilayer structure.

< Comparative example  1>

2 g of powdered activated carbon (D company, iodine adsorption power; 950 mg / g), 1 g of granular activated carbon (D company, iodine adsorption power; 950 mg / g), 1 g of fibrous activated carbon (D company, iodine adsorption power; 1000 mg / g) Was dispersed at a stirring speed of 500rpm, but after several minutes, precipitation occurred and coating was impossible.

<Evaluation>

1. Measurement of activated carbon sheet weight after drying

The dried activated carbon sheet of the present invention was cut to have a width of 10 cm and then weighed.

2. Measurement of flow rate

2. Measurement of flow rate

After inserting the activated carbon sheet prepared from the present invention into the cartridge in a circular wound form, 2 ppm of raw water was supplied at a flow rate of 20 L / min by an outside-in method, and the residual chlorine removal rate of the filtered water was 95% or more. It was defined as the cumulative amount of water filtered under conditions maintained at. The residual chlorine concentration of water was measured by a residual chlorine measuring instrument (TOA, 0-2 mg / L), and then the removal rate was calculated by the following equation.

Removal rate = (chlorine concentration in raw water-raw water concentration in filtration water) / chlorine concentration in raw water

3. Measurement of pressure loss

The pressure gauge installed on the raw water inflow side and the raw water outflow side in performing the water flow experiment in the outside-in method after inserting the activated carbon sheet filter manufactured from the present invention into the cartridge as in the above water flow measurement experiment. The numerical difference of the phases is defined as the pressure loss.

division Seat weight (g / m2) Volume (L) Pressure loss (MPa) Example 1 24 590,000 0.02-0.06 Example 2 22 630,000 0.02 to 0.04 Example 3 31 520,000 0.03-0.06 Example 4 88 420,000 0.03 to 0.07

As can be seen in Table 1, the activated carbon sheet of the present invention is characterized in that the activated carbon layer is located on one side of the nonwoven fabric, located on both sides, or between the nonwoven fabrics, and has excellent water flow rate and low pressure loss. Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. .

As a result of the above, the activated carbon sheet of the present invention has a simple manufacturing process and is used in the form of a sheet coated on non-woven fabric with activated carbon having various granules, so that the pressure loss is small, the service life is extended, and the water flow rate and the removal efficiency are excellent. There is a characteristic.

The filter composed of the activated carbon sheet of the present invention has the activated carbon slurry is located between the non-woven fabric, there is no risk of dropping the activated carbon and can be used as RO pretreatment filter of water direct type water purifier, household water purifier, as well as general high water treatment field. Suitable

The filter using the activated carbon sheet of the present invention manufactured as described above can be used as a RO pretreatment filter of a water direct type water purifier and a household water purifier, and is also suitable for general high water purification fields.

10, 20, 30 .. Activated Carbon Sheet
11. 21. 31, 31` .. Non-woven layer
12, 22, 22`, 32 .. Activated Carbon Layer

Claims (14)

A nonwoven fabric layer; And
Activated carbon sheet comprising an activated carbon slurry coating layer formed on one side or both sides of the nonwoven fabric layer. A first nonwoven layer;
An activated carbon slurry coating layer formed on one surface of the first nonwoven fabric layer; And
Activated carbon sheet comprising a; second non-woven fabric layer formed on the activated carbon slurry coating layer. 3. The activated carbon sheet according to claim 2, wherein the first nonwoven layer is a fine-grain nonwoven layer, and the second nonwoven layer is a fine-grain nonwoven layer. The activated carbon sheet according to claim 1 or 2, wherein the activated carbon slurry coating layer is formed by coating a slurry including activated carbon, a surfactant, and a dispersant and then drying the coating. The activated carbon sheet according to claim 4, wherein the activated carbon has a specific surface area of 500 m ² / g or more, and an iodine adsorption amount of 950 m ² / g or more. The activated carbon sheet according to claim 4, wherein the surfactant is an anionic polymer surfactant, a cationic polymer surfactant, or a mixture thereof. The activated carbon sheet of claim 6, wherein the anionic polymer surfactant is at least one selected from the group consisting of polyacrylic acid (PAA), polystyrenesulfonate (PSS), and polyacrylamide (PAM). The method of claim 6, wherein the cationic polymer surfactant is at least one selected from the group consisting of polyethyleneimine (PEI), polyarylamine hydrochloride (PAH) and polydiaryldimethylammonium chloride (PDADMAC) Activated carbon sheet. The activated carbon sheet according to claim 4, wherein the dispersant is at least one selected from the group consisting of low melting polyethylene short fibers, polyester short fibers and cellulose based short fibers. The method of claim 4, wherein the slurry is 0.1 to 10% by weight activated carbon; 0.1 to 0.55% surfactant; Dispersant 1-5 weight%; And a residual amount of the solvent. Activated carbon filter cartridge for water purification using the activated carbon sheet according to claim 1. A first step of preparing a slurry consisting of 0.1 to 10% by weight of activated carbon, 0.1 to 0.5% by weight of surfactant, 1 to 5% by weight of dispersant, and a residual amount of solvent;
A second step of coating the prepared slurry on a nonwoven fabric; And
And a third step of drying and heat-treating the slurry-coated nonwoven fabric. The method of claim 12, further comprising laminating the nonwoven fabric again on the slurry coated on the nonwoven fabric after the second step. The method of claim 12 or 13, wherein the first step of preparing the slurry,
Step 1-1 of mixing the activated carbon dispersion dispersed in the solvent with a cationic surfactant;
Step 1-2 adding an anionic surfactant to the dispersion of the activated carbon, cationic surfactant; And
And adding a dispersant to the activated carbon, a cationic surfactant and an anionic surfactant dispersion.

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