KR20160027417A

KR20160027417A - Filter for removal of organic material and manufacturing method thereof

Info

Publication number: KR20160027417A
Application number: KR1020140114100A
Authority: KR
Inventors: 차봉준; 김명중
Original assignee: 도레이케미칼 주식회사
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2016-03-10

Abstract

The present invention relates to a filter medium for removing organic materials and a method for producing the filter medium, and more particularly, to a filter medium for removing organic materials capable of generating disinfection by-products by reacting with a disinfectant such as chlorine as well as affecting taste, smell, And relates to an excellent filter material and a manufacturing method thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter material for removing organic materials,

Aramid refers to an aromatic polyamide fiber and collectively refers to a wholly aromatic polyamide having a molecular structure in which at least 85% of an amide bond (-CONH-) is bonded between aromatic rings. These aramids are divided into para-aramid and meta-aramid.

Since the para-aramid has excellent tensile strength, elastic modulus and heat resistance compared to ordinary organic fibers, it is used in fields requiring high strength and high elasticity which are cost competitive. Meta-aramid has excellent heat resistance and flame retardancy, And physical properties such as elastic modulus are almost similar to conventional polyester and the like.

In addition, the para-aramid is dissolved in toxic and dangerous organic solvents such as strong sulfuric acid, while the meta-aramid is dissolved in an organic solvent such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, N- And then processed.

As described above, the aramid sheet which can be easily used for drying or ironing laundry by using meta-aramid fibers having different fineness is disclosed in Korean Patent No. 10-1226225 (Apr. .

Meanwhile, carbon nanotubes (CNTs) have been discovered for the first time by Iijima using an electric discharge method, and there has been much research on this new carbon material since the interest in this new carbon material has increased. The first carbon nanotube discovered by Iijima is 200 times stronger than steel and has excellent mechanical properties, excellent elasticity, heat resistance to withstand 2800 ° C in vacuum, nearly twice the thermal conductivity of diamond, and about 1000 times that of copper High current transfer capability, etc., and is considered to be highly applicable in all engineering fields.

These carbon fibers are cut even when only 1% is deformed, while carbon nanotubes are very stable to withstand 15% deformation. Here, the carbon nanotubes are in the form of a plate-like graphene sheet having a diameter of nanometer size, and the graphene sheet shows the characteristics of a metal or a semiconductor according to the angle and structure of the dried graphite sheet.

In addition, according to the number of the connecting walls, a single-walled carbon nanotube (hereinafter referred to as "SWCNT") and a multi-walled carbon nanotube (hereinafter referred to as "MWCNT" It is classified.

The technology underlying the present invention is disclosed in U.S. Patent Application Publication No. US 2011/0024158 and Korean Patent Laid-Open No. 10-2010-0108868.

Furthermore, carbon nanotubes are being used as additives for various composites due to their high electrical conductivity, thermal stability, tensile strength and resilience. It is important to effectively disperse the bundles of carbon nanotubes in a solvent in order to form a functional composite material to which carbon nanotubes are added. For example, in order to produce a polymer composite in which carbon nanotubes are dispersed, it is necessary to uniformly disperse carbon nanotubes in a polymer matrix. However, the carbon nanotubes have a problem of having a very low dispersion degree with respect to the solvent due to the long length and the strong attractive force between the carbon nanotubes.

To solve these problems, techniques for mixing carbon nanotubes with a polymer material by providing a dispersion force through a chemical and physical pre-treatment process have been studied.

In order to increase the dispersibility of the carbon nanotube itself, there is a known method for oxidizing the surface of the carbon nanotube with strong acidic solution such as sulfuric acid, hydrochloric acid or nitric acid. However, And there is a problem that when the carbon nanotubes treated with the acidic solution are thermally dried, the dispersibility of the carbon nanotubes is not sufficient.

Disclosure of the Invention The present invention has been devised to solve the problems as described above, and it is an object of the present invention to provide a filter material for effectively removing organic substances and a method of manufacturing the filter material which can not use other physical and / or chemical adsorption methods other than water treatment by a filter material .

In addition, it has a high pressure resistance suitable for use as a filter material, and it is intended to provide a filter material which effectively removes organic substances such as humic acid.

The present invention relates to a polymer solution comprising at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And a carbon nanotube that is not physically or chemically modified.

According to a preferred embodiment of the present invention, 0.1 to 5.0 parts by weight of the carbon nanotube may be included in 100 parts by weight of the polymer solution.

According to another preferred embodiment of the present invention, the carbon nanotubes may have an average diameter of 1 to 20 nm and an average length of 1 to 300 μm.

The present invention also relates to a process for preparing a mixed solution by mixing a composition as described above; Casting the mixed solution on a support and phase transitions to produce a sheet; And drying the sheet to produce a filter material for removing organic materials.

According to a preferred embodiment of the present invention, the phase transition is a phase transition including at least one of the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone Solution.

According to another preferred embodiment of the present invention, the casting may be performed at a temperature of 20 to 30 ° C and a pressure of 0.5 to 1.5 atm, and the phase transition may be performed using a water of 20 to 30 ° C.

According to another preferred embodiment of the present invention, the sheet may have an average thickness of 50 to 500 mu m.

Furthermore, the present invention provides a polymer comprising at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And carbon nanotubes not physically or chemically modified; And an organic substance removing filter medium.

According to a preferred embodiment of the present invention, the carbon nanotubes may have an average diameter of 1 to 20 nm and an average length of 1 to 300 μm.

According to another preferred embodiment of the present invention, the organic material may be at least one selected from the group consisting of Humic acid, Fulvic acid, Haloacetic acid, Phenol, and Trihalomethane. And at least one of the groups.

According to another preferred embodiment of the present invention, the aramid may include at least one of the group consisting of a meta-aramid polymer, a para-aramid polymer, and a meta-para-aramid polymer.

According to another preferred embodiment of the present invention, the organic material removing filter medium may have an average porosity of 80 to 88%.

According to another preferred embodiment of the present invention, the organic material removal filter medium may have an organic material removal rate of 90 to 98%.

According to another preferred embodiment of the present invention, the organic material removing filter material may include 1 to 30 parts by weight of carbon nanotubes per 100 parts by weight of the polymer.

The present invention has the effect of effectively providing a filter material for removing organic materials and a method for producing the filter material, which can not use other physical and / or chemical adsorption methods other than water treatment by a filter material.

In addition, it has a high pressure resistance suitable for use as a filter material, and has an effect of providing a filter material for effectively removing organic substances such as humic acid.

1 to 3 are electron micrographs of the organic material removing filter material prepared in Example 1, wherein FIG. 1 is a front view, FIG. 2 is a rear surface, and FIG. 3 is a SEM photograph of a cross section.
Figs. 4 to 6 are electron micrographs of the organic material removing filter material prepared in Example 2, Fig. 4 is a front surface, Fig. 5 is a rear surface, and Fig.
Figs. 7 to 9 are electron micrographs of the organic material removing filter material prepared in Example 3, Fig. 7 is a front view, Fig. 8 is a rear surface, and Fig.
Figs. 10 to 12 are electron micrographs of the organic material removing filter material prepared in Example 4, Fig. 10 is a front view, Fig. 11 is a rear surface, and Fig.
Figs. 13 to 15 are electron micrographs of the filter media prepared in Comparative Example 1, Fig. 13 is a front view, Fig. 14 is a rear view, and Fig.
16 shows the flow measurement results according to the pressure of the filter media of Examples 1 to 4 and Comparative Example 1 in Experimental Example 1.
17 to 21 show results of the experiment for removing organic substances in Experimental Example 2, FIG. 17 shows the filtrate filtered by the filter material of Comparative Example 1, FIG. 18 shows the filtrate filtered by the filter material of Example 1, FIG. 20 is a filtrate obtained by filtration of the filtration media of Example 3, and FIG. 21 is filtration filtration of filtration media of Example 4.
22 to 23 are the results of the spectroscopic curves measured in Experimental Example 2, FIG. 22 shows the results of the filtrate filtered using the filter materials of Experimental Examples 1 to 4 and Comparative Example 1, FIG. 23 shows the results of Examples 5 to 8 And the filtrate obtained by filtering the filter material of Comparative Example 2.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a polymer solution comprising at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And carbon nanotubes not physically or chemically modified; And a method of manufacturing a filter material for removing an organic material using the filter material. The present invention provides a filter material for effectively removing organic materials, which can not use other physical and / or chemical adsorption methods other than water treatment by a filter material, There is an effect of providing a manufacturing method thereof. In addition, it has a high pressure resistance suitable for use as a filter material, and has an effect of providing a filter material for effectively removing organic substances such as humic acid.

The polymer solution is not particularly limited as long as it is a solution in which a polymer used as a material of a filter medium is melted. Preferably, the polymer solution is a solution of a polymer such as aramid, polyvinylidene fluoride (PVDF), polyethersulfone and polysulfone, , And more preferably an aramid solution or a polyvinylidene fluoride solution.

The polymer solution is not particularly limited as long as it is a solvent that can be usually used as a solvent for preparing a filter medium, but preferably at least one selected from the group consisting of N-methylpyrrolidone, dimethylacetamide, dimethylsulfoxide and dimethylformamide .

The carbon nanotube is not particularly limited as long as it can be conventionally purchased and / or manufactured, but preferably a single-walled nanotube (SWNT) or a multi-walled nanotube (MWNT) .

In addition, the carbon nanotubes are not particularly limited as long as the carbon nanotubes can be conventionally purchased and / or manufactured, but it is preferable to use carbon nanotubes that are not physically or chemically modified, Carbon nanotubes which are not chemically modified and have an average diameter of 1 to 20 nm and an average length of 1 to 300 m can be used.

In general, carbon nanotubes added to a sheet or a separation membrane serve to increase the hydrophilicity by physically or chemically modifying the surface with an acid or a plasma. However, in the present invention, the carbon nanotubes not physically and chemically modified It is possible to simplify the manufacturing process, to reduce the manufacturing cost and the cost, as well as to improve the permeability and the pressure resistance of the filter material for removing organic materials.

The composition for removing organic materials may include 0.1 to 5.0 parts by weight of carbon nanotubes per 100 parts by weight of the polymer solution, although the content ratio of the polymer material solution and the carbon nanotubes is not particularly limited. .

If less than 0.1 part by weight of the carbon nanotube is contained in 100 parts by weight of the polymer solution, the organic substance removal effect may be low or the pressure resistance may be low. If more than 5.0 parts by weight When nanotubes are included, uniform dispersion and mixing problems may occur.

The aramid is not particularly limited as long as it can be conventionally manufactured and / or purchased, but it may preferably include at least one of the group consisting of a meta-aramid polymer, a para-aramid polymer and a meta-para-aramid polymer.

The meta-aramid polymer is not particularly limited as long as it is capable of being synthesized and / or commercially available, but is preferably a poly (metaphenylene isophthalamide), a poly (m-benzamide), a poly (m-phenylene isophthalate) Amide), poly (m, m'-phenylenebenzamide), and poly (1,6-naphthylene isophthalamide).

In addition, the para-aramid polymer is not particularly limited as long as it can be synthesized and / or commercially available, but is preferably poly (paraphenylene terephthalamide), poly (p-phenylene p, p'- Poly (p-phenylene 1,5-naphthylene dicarboxamide), poly (trans, trans-4,4'-dodecahydrobiphenylene terephthalamide), poly (Cinnamamide), poly (p-phenylene 4,8-quinolinedicarboxamide), poly (1,4- [2,2,2] -bicyclooctyleneterephthalamide), copoly (P-phenylene-4,4'-trans-stilbene carboxamide) and poly (p-phenylene acetylene dicarboxamide) ) May be included.

Further, the meta-para-aramid polymer is not particularly limited as long as it can be synthesized and / or commercially available, but may preferably include poly (metaphenylene terephthalamide).

In addition, the present invention relates to a process for preparing a mixed solution by mixing a composition as described above; Casting the mixed solution on a support and phase transitions to produce a sheet; And drying the sheet to produce an organic material removing filter material; The present invention also provides a method for manufacturing an organic material removing filter material.

First, a mixed solution is prepared by mixing the organic material removing filter material composition as described above.

The mixing is not particularly limited so long as it is a method for mixing two or more kinds of liquid, but it can be preferably stirred.

The agitation can be performed for uniform dispersion of the aramid solution and the carbon nanotubes. The agitation speed is not particularly limited, but may be preferably 5 to 30 minutes at 100 to 5,000 rpm.

If the stirring speed is less than 100 rpm, uniform dispersion of the aramid and the carbon nanotubes in the mixed solution may be difficult to produce, resulting in difficulty in producing a uniform sheet. If the stirring speed exceeds 5,000 rpm, There may be disadvantages.

If the agitation time is less than 5 minutes, uniform dispersion of the aramid and the carbon nanotubes in the mixed solution is difficult, so that it may be difficult to produce a uniform sheet. If the agitation time exceeds 30 minutes, There may be disadvantages.

Next, the mixed solution is cast on a support and phase transformed to produce a sheet.

The support is not particularly limited as long as it is usually used for producing a thin film by applying a polymer solution. Preferably, the support is made of polypropylene (PP), polyethylene (PE), polysulfone (PSf), polyvinylidene fluoride (PVDF) A polytetrafluoro polymer (PTEE), a glass or metal substrate can be used.

The casting is not particularly limited as long as it is a condition for preparing a thin film by applying a polymer solution, but it is preferably carried out at 20 to 30 ° C and 0.5 to 1.5 atm.

The phase transition is not particularly limited as long as it is a phase transition method that can be used in the production of a conventional polymer thin film. Preferably, the phase transition can be performed by immersing the phase transition solution in a coating and / or a phase transition solution. More preferably, And the like.

The thickness of the sheet is not particularly limited as long as it is the thickness of the conventionally used water treatment media, but preferably the average thickness is 50 to 500 占 퐉.

If the average thickness is less than 50 탆, a problem of low mechanical strength may occur. If the average thickness exceeds 500 탆, a problem of low permeability may occur.

Next, the sheet is dried to produce an organic material-removing filter material.

The drying is not particularly limited as long as it is usually carried out after the production of the filter media, but it may be carried out preferably at 15 to 30 ° C for 12 to 24 hours.

If drying is carried out at a temperature lower than 15 ° C, a problem of low productivity may occur due to an increase in drying time, and when the drying is conducted at a temperature exceeding 30 ° C, Lt; / RTI >

In addition, drying in less than 12 hours may result in insufficient drying, and drying in excess of 24 hours may cause productivity problems due to long drying times.

Furthermore, the present invention relates to a polymer comprising at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And carbon nanotubes not physically or chemically modified; And an organic substance removing filter medium.

The polymer is not particularly limited as long as it is a polymer commonly used as a material for filter media, but preferably one of the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone Or more, and more preferably an aramid solution or a polyvinylidene fluoride solution.

The amount of the organic material removing filter medium is not particularly limited as far as it contains the polymer solution and the carbon nanotubes. Preferably, the amount of the carbon nanotubes may be 0.1 to 5.0 parts by weight based on 100 parts by weight of the polymer solution.

If less than 0.1 part by weight of the carbon nanotube is contained in 100 parts by weight of the polymer solution, the organic substance removal effect may be low or the pressure resistance may be low. If more than 5.0 parts by weight When the nanotubes are included, it is difficult to form a uniform film due to high viscosity.

In addition, the filter material for removing organic materials according to the present invention has an effect of removing organic substances to be removed during water treatment. Particularly, humic acid, haloacetic acid, phenol and trihalomethane Trihalomethane) in order to remove at least one of the group.

The organic material removal filter material has an average porosity of 80 to 88% and is very suitable for use as a filter material, and has a remarkably improved organic material removal rate of 90 to 98%.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is only an example for explaining the present invention in more detail, and the scope of the present invention is not limited to these embodiments.

[ Example ]

Example One.

A polymer solution containing 15% by weight of polymer was prepared using aramid (Arawin, Toraychemical) and dimethylacetamide (a product of Daesung) as a solvent. Then, 0.5 g of multi-wall carbon nanotubes (Hanhwa CNT, CM 150) was added to 100 ml of the polymer solution, and the mixture was stirred at 600 rpm for 15 hours to prepare a composition for removing organic materials.

The organic material-removing filter material composition was applied to an SUS substrate at 25 캜, cast using a 200 탆 coating knife, and immersed in water at 25 캜 for 14 hours to induce phase separation to prepare a filter material. Then, the filter material was immersed in running water at 25 ° C. for 24 hours to remove residual solvent, and then dried at 25 ° C. and 1 atm for 12 hours to prepare an organic material-removing filter material.

SEM photographs were taken using a scanning electron microscope (SEM, SNE-3000M), and SEM photographs of the front surface are shown in Fig. 1, SEM photographs of the rear surface are shown in Fig. 2, The photograph is shown in Fig.

Example 2.

An organic material-removing filter material was prepared in the same manner as in Example 1, except that 1.25 g of carbon nanotubes were added.

SEM photographs were taken using a scanning electron microscope (SEM, SNE-3000M), SEM photographs of the front surface are shown in FIG. 4, SEM photographs of the rear surface are shown in FIG. The photograph is shown in Fig.

Example 3.

The organic material-removing filter material was prepared in the same manner as in Example 1, except that 2.5 g of carbon nanotubes were added.

SEM photographs were taken using a scanning electron microscope (SEM, SNE-3000M), the SEM photographs of the front surface are shown in FIG. 7, the SEM photographs of the rear surface are shown in FIG. 8, The photograph is shown in Fig.

Example 4.

The organic material-removing filter material was prepared in the same manner as in Example 1, except that 3.70 g of carbon nanotubes were added.

SEM photographs were taken using a scanning electron microscope (SEM, SNE-3000M), SEM photographs of the front surface are shown in FIG. 10, SEM photographs of the rear surface are shown in FIG. 11, The photograph is shown in Fig.

Comparative Example One.

A filter material was prepared in the same manner as in Example 1, except that no carbon nanotubes were added.

SEM photographs of the prepared filter media were taken using a scanning electron microscope (SEM, SNE-3000M). SEM photographs of the front surface are shown in Fig. 13, SEM photographs of the rear surface are shown in Fig. 14, Respectively.

Experimental Example 1. Flow and Porosity Measure

Experimental Example 1-1: Porosity Measure

The porosity of the filter material for removing organic materials and the filter material of Comparative Example 1 in Examples 1 to 4 was determined by measuring the density and the theoretically calculated density of the filter material by measuring the weight and volume of the filter material using the following equation And the measurement results are shown in Table 1 below.

At this time, theoretical density = weight ratio of aramid × 1.38 + weight ratio of carbon nanotubes × 0.02.

Example 1-2: Flow measurement

The filter material for removing organic materials and the filter material for Comparative Example 1 in Examples 1 to 4 were previously immersed in a 30% aqueous ethanol solution for 10 minutes and then immersed in distilled water for 30 minutes. Then, pure water at 25 ° C was pressurized under a constant pressure of 1 bar, 2 bar or 3 bar, respectively, and the amount of water filtered in a dead-end manner for 60 minutes was measured by a balance. ). The measured water permeability is shown in Table 1 and FIG. 16 below.

division Weight ratio of carbon nanotubes (%) Flow at 1 bar (ml / min) Flow rate at 2 bar (ml / min) Flow rate at 3 bar (ml / min) Porosity (%) Example 1 3.2 297.65 ± 28 418.53 ± 21 493.10 ± 13 86.54 Example 2 7.7 317.80 ± 27 450.32 ± 33 539.74 ± 21 85.89 Example 3 14.3 178.95 ± 5 262.31 ± 13 329.13 + - 4.9 85.39 Example 4 20.0 11.74 ± 1 22.63 ± 1 35.31 + - 0.33 84.53 Comparative Example 1 0.0 5.63 ± 0.74 10.51 + - 0.4 18.45 + - 0.46 89.48

As can be seen from Table 1 and FIG. 16, the organic material removing filter media of Examples 1 to 4 including carbon nanotubes were significantly higher than the filter material of Comparative Example 1 which did not contain carbon nanotubes I could confirm the flow rate.

Particularly, the organic material removing filter media of Examples 1 to 3 including 3.2 to 14.3% by weight of carbon nanotubes showed significantly higher flow than Example 4 containing 20% by weight of excess carbon nanotubes.

Example 5.

An organic material-removing filter material was prepared in the same manner as in Example 1, except that polyvinylidene fluoride (PVDF, solvay solef 1015) was used instead of aramid.

Example 6.

The organic material-removing filter material was prepared in the same manner as in Example 5 except that 7.7 g of carbon nanotubes were added.

Example 7.

The organic material-removing filter material was prepared in the same manner as in Example 5 except that 14.3 g of carbon nanotubes were added.

Example 8.

An organic material-removing filter medium was prepared in the same manner as in Example 5 except that 20.0 g of carbon nanotubes were added.

Comparative Example 2.

The filter material was prepared in the same manner as in Example 5, except that no carbon nanotubes were added.

Experimental Example 2. Measurement of organic matter removal rate

The organic material removal efficiency was measured with respect to the filter materials of Examples 1 to 8 and Comparative Example 1. The organic material used in this experiment was humic acid represented by the following formula (1).

Specifically, 50 L of an aqueous solution containing 5% by weight of humic acid was filtered through filter media of Examples 1 to 4 or Comparative Example 1, and the filtrate was subjected to spectroscopy at 283 nm using a UV spectrophotometer (Varian, Cary 100) After the measurement, the organic material removal ratio was calculated by the following equation (2), and the results are shown in Table 2 below.

In addition, an aqueous solution (influent water) containing 5% by weight of humic acid and a filtrate after filtering through the filter media of Examples 1 to 4 or Comparative Example 1 were shown in Figs. 17 to 21.

Specifically, the filtrate filtered by the filter material of Comparative Example 1 is shown in Fig. 17, the filtrate filtered by the filter material of Example 1 is shown in Fig. 18, the filtrate filtered by the filter material of Example 2 is shown in Fig. 19, Fig. 20 shows the filtrate filtered by the filter medium of Example 3, and Fig. 21 shows the filtrate filtered by the filter medium of Example 4.

In addition, the results of Examples 1 to 4 and Comparative Example 1 of the UV spectroscopy curves measured as described above are shown in Fig. 22, and the results of Examples 5 to 8 and Comparative Example 2 are shown in Fig.

division Used polymer Content of Carbon Nanotubes (% by weight) Organic matter removal rate (%) Example 1 Aramid solution 3.2 92.97 ± 1.06 Example 2 Aramid solution 7.7 94.20 ± 0.87 Example 3 Aramid solution 14.3 90.04 + 1.49 Example 4 Aramid solution 20.0 92.67 ± 1.09 Example 5 PVDF solution 3.2 66.15 + - 1.23 Example 6 PVDF solution 7.7 74.79 ± 0.86 Example 7 PVDF solution 14.3 26.43 + - 0.67 Example 8 PVDF solution 20.0 38.82 + - 1.12 Comparative Example 1 Aramid solution 0.0 50.37 + - 7.47 Comparative Example 2 PVDF solution 0.0 14.30 0.1

As can be seen from Table 2 and FIGS. 17 to 23, when the filter media of Examples 1 to 4 and Comparative Example 1 prepared by the same method except for the addition of carbon nanotubes were compared, the carbon nanotubes of Examples 1 to 4 Was remarkably superior to the filter material of Comparative Example 1 which does not contain carbon nanotubes.

Comparing the filter media of Examples 5 to 8 and Comparative Example 2 except for the addition of carbon nanotubes, the filter media of Examples 5 to 8 including carbon nanotubes were compared with Comparative Examples 2, which has remarkably improved organic material removal ability.

As can be seen from Examples, Comparative Examples and Experimental Examples, the organic material-removing filter material of the present invention, prepared using a composition comprising a chemically and / or physically unmodified carbon nanotube and a polymer solution, And the improvement of the pressure resistance due to the improved flow rate was confirmed. In addition, it was found that the filter material for removing organic materials of the present invention has a superior ability to remove organic materials than a filter material that does not include carbon nanotubes, and is very suitable for use as a filter material for removing organic materials from inflow water.

Claims

A polymer solution containing at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And carbon nanotubes not physically or chemically modified; Wherein the organic material-removing filter material composition comprises:

The organic material removing filter material composition according to claim 1, wherein 0.1 to 5.0 parts by weight of the carbon nanotube is contained relative to 100 parts by weight of the polymer solution.

The organic material removing filter material composition according to claim 1, wherein the carbon nanotubes have an average diameter of 1 to 20 nm and an average length of 1 to 300 μm.

Preparing a mixed solution by mixing the composition of any one of claims 1 to 3;
Casting the mixed solution on a support and phase transitions to produce a sheet; And
Drying the sheet to prepare an organic material removing filter material;
Wherein the organic material removing filter material is a porous material.

The method according to claim 4, wherein the phase transition is performed with a phase transfer solution containing at least one of the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone Wherein the organic material removing filter material is a porous material.

5. The method of claim 4, wherein the casting is performed at a temperature of 20 to 30 DEG C and a pressure of 0.5 to 1.5 atm, and a phase transition temperature of 20 to 30 DEG C is used.

5. The method of claim 4, wherein the sheet has an average thickness of 50 to 500 mu m.

A polymer comprising at least one member selected from the group consisting of aramid, polyvinylidene fluoride (PVDF), polyethersulfone, and polysulfone; And carbon nanotubes not physically or chemically modified; And an organic substance removing filter medium.

The organic material removing filter medium according to claim 8, wherein the carbon nanotubes have an average diameter of 1 to 20 nm and an average length of 1 to 300 μm.

The method of claim 8, wherein the organic material is at least one selected from the group consisting of Humic acid, Fulvic acid, Haloacetic acid, Phenol, and Trihalomethane Wherein the organic material removing filter material comprises:

9. The filter medium of claim 8, wherein the aramid comprises one or more of the group consisting of a meta-aramid polymer, a para-aramid polymer, and a meta-para-aramid polymer.

The organic material removing filter medium according to claim 8, wherein the organic material removing filter medium has an average porosity of 80 to 88%.

The organic material removal filter medium according to claim 8, wherein the organic material removal filter material has an organic material removal rate of 90 to 98%.

The organic material removing filter medium according to claim 8, wherein the organic material removing filter material comprises 1 to 30 parts by weight of carbon nanotubes per 100 parts by weight of the polymer.