KR101612403B1 - Nanofiber Composite Impregnating Prussian Blue for Adsorption of Radioactive Cs, Filter Materials and Decontamination Method of Radioactive Cs Using the Same - Google Patents

Abstract

The present invention relates to a nanofiber composite having a prussian blue or prussian blue metal complex supported on a radionuclide capable of adsorbing radioactive cesium with high efficiency and high selectivity, a process for producing the same, and a method for decontaminating radioactive cesium using the composite.
The Prussian blue-supported nanofiber composite material for adsorbing radioactive cesium of the present invention comprises a mixture of a fiber-forming polymer material and prussian blue, and is radiated and integrated by nanofibers having a diameter of 3 μm or less to form a nano- Fiber membranes; And a porous substrate laminated on one side or both sides of the nanofiber membrane to support the nanofiber membrane.

Description

TECHNICAL FIELD [0001] The present invention relates to a Prussian blue-supported nano fiber composite for radioactive cesium adsorption, a filter medium using the same, and a decontamination method of radioactive cesium,

The present invention relates to a nanofiber composite having a prussian blue or prussian blue metal complex supported on a radionuclide capable of adsorbing radioactive cesium with high efficiency and high selectivity, a filter medium using the same, and a decontamination method of radioactive cesium.

March 2011 Fukushima Nuclear Power Plant accident in Japan caused serious environmental problems because soil, flora, fauna and waste were contaminated by radiation. Radioactive iodine and radioactive cesium are the main radioactive materials generated in the accident of a nuclear power plant.

Radioactive iodine has a half-life of about 8 days, whereas radioactive cesium has a half-life of 30 years, which is very long. Cesium is similar in chemical properties to potassium, and when absorbed, it concentrates in muscles and the like, resulting in immunodeficiency and various cancers (infertility, bone cancer, lung cancer, , Breast cancer, etc.), it is necessary to recover radioactive cesium at high efficiency when leaking to the external environment.

In addition, radioactive materials contained in fly ash contained in leachate and exhaust gas such as ash and waste landfill when treated with radioactive waste at an incinerator contain various types of radioactive materials. Radioactive cesium is a major cause of soil and water pollution .

In addition to these nuclear power plant accidents, much effort and expense are required for the safe treatment and management of high level radioactive waste generated at the time of operation of nuclear power plants. Especially, high level radioactive liquid waste contains a large amount of effective components. Is a major contributor to the recycling of high-level radioactive waste as well as strontium. Therefore, when it is recovered and recycled, it is beneficial not only in terms of cost reduction for disposal but also in terms of recycling of resources and also in terms of safety.

The radioactive cesium contaminated in soil is in the form of cesium ion (Cs ⁺ ). It is strongly bound to clay, organic matter, and inorganic substances, making it difficult to recover. Radioactive cesium ion contaminated in rivers and oceans is in low concentration There has been a limitation in selective adsorption because it exists.

For the adsorption and removal of radioactive materials from radioactive waste solution of nuclear power plants, natural minerals such as zeolite, activated carbon or bentonite having a large surface area have been used, or ion exchange resins, hollow fiber filters or reverse osmosis membranes have been used. However, there is a limitation in selectively adsorbing radioactive waste liquid or cesium distributed at a low concentration in water with high efficiency.

For the selective adsorption of radioactive cesium, a royal blue dye called prussian blue has been used. Prussian blue has been shown to reduce the biological half-life of Cs-137 from 110 days to 30 days as a hydrate of ferrocyanide iron, which has been used in refined cesium exposure to reduce exposure to cesium.

In addition, the Institute of Industrial Technology, an independent administrative agency in Japan, developed Prussian blue nanoparticles showing selective adsorption to cesium, and developed various types of cesium adsorbents that selectively adsorb radioactive cesium and cesium in leachate.

This Prussian blue cesium adsorption mechanism has been known to selectively adsorb cesium hydrate as pores in Prussian blue crystals, as shown in Fig.

Korean Patent Laid-Open Publication No. 10-2005-120312 (Patent Document 1) discloses a method of adsorbing hexa-cyanophosphorus (II) which is an anion to an anion exchange resin and adsorbing Co, which is a transition metal, ≪ / RTI > capable of selective adsorption of < RTI ID = 0.0 > However, the ion exchanger disclosed in Patent Document 1 has a limitation in selectively adsorbing radioactive waste liquid or cesium distributed at a low concentration in water with high efficiency.

Korean Patent Registration No. 10-1172247 (Patent Document 2) discloses a method for converting radioactive carbon in an ionic form in a radioactive waste solution into radioactive carbon dioxide by using an acidic solution, and removing the radioactive carbon dioxide by adsorbing the radioactive carbon dioxide on a radioactive carbon dioxide adsorbent A first decontamination step in which a radionuclide in the first decontamination waste paper and a radionuclide dissociated in the acidic solution in the first decontamination step are mixed with a radioactive nuclide using a supercritical carbon dioxide and a carbon dioxide- A second decontamination step of extracting and removing the carbon nanotubes with a Co, Cs and a metal substance extraction auxiliary agent) and a drying step of heating and drying the decontaminated waste paper in the first decontamination step and the second decontamination step A method for decontaminating waste water has been proposed, but there is a limitation in selectively adsorbing radioactive cesium with high efficiency.

: Korean Patent Publication No. 10-2005-120312 Korean Registered Patent No. 10-1172247

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and its object is to provide a radioactive cesium dissolved in polluted water or leachate, which is capable of adsorbing highly efficiently and highly selectively, Fiber composite.

Another object of the present invention is to provide a filter media having Prussian blue supported nanofiber composite material having a cesium recovery function capable of simultaneously separating / recovering solid fine particles adsorbed on cesium in polluted water.

It is still another object of the present invention to provide a method for decontaminating radioactive cesium by decontaminating radioactive cesium using a nanofiber composite containing a prussian blue or prussian blue metal complex capable of adsorbing radioactive cesium in a highly efficient and highly selective manner .

In order to achieve the above object, according to the present invention, a prussian blue-supported nano fiber composite for radioactive cesium adsorption comprises a mixture of a fiber-forming polymer material and prussian blue, and is irradiated with nanofibers having a diameter of 3 μm or less A nanofiber membrane integrated with three-dimensional micropores; And a porous substrate laminated on one side or both sides of the nanofiber membrane to support the nanofiber membrane.

The content of prussian blue contained in the nanofiber may be set in the range of 5 to 50 wt.% Relative to the fiber-forming polymer.

The porous substrate may be made of a material capable of improving the physical properties of the nanofiber and improving the handling property, such as a nonwoven fabric, a woven fabric, etc., as an strength reinforcing layer for supporting the nanofiber membrane.

In the present invention, the content (basis weight) of the nanofibers emitted to form the nanofiber membrane is preferably set in the range of 0.5 to 50 gsm (gram per square meter) based on the whole spinning solution. In this case, when the flow rate is less than 0.5 gsm, there is a problem in handling due to an excessively thin film. If the flow rate exceeds 50 gsm, there is no problem in use, but the process cost is increased due to the material cost and production speed. have. Therefore, the amount of the polymer substance dissolved in the solvent is determined in consideration of the basis weight of the resulting nanofiber.

Also, the average pore size of the nanofiber membrane is set in the range of 0.2 to 1.0 탆, the fiber diameter is set in the range of 0.05 to 3 탆, and the average pore size And the thickness are preferably set.

The polymer material may be a natural polymer or a synthetic polymer material alone or in combination, and is not particularly limited as long as it is a polymer material capable of forming nanofibers by electrospinning. The fiber-forming polymer is a hydrophilic polymer, and the adsorbability of cesium ions is high.

The solvent is selected from the group consisting of dimethylformamide (DMF), dimethylacetamide (DMAc), tetrahydrofuran (THF), methylene chloride, formic acid, acetone, alcohol, chloroform ), Water, and dimethyl sulfoxide (DMSO), may be used alone or in combination.

In the present invention, at the time of forming the nanofiber membrane, electrospinning can be carried out by blending two or more kinds of fiber-forming polymeric materials, wherein the solvent is selected from those having compatibility with the polymer material to be used, Or a mixture of two or more thereof.

Also, the Prussian blue-supported nanofiber composite for adsorbing radioactive cesium according to the present invention is a porous substrate which serves as a support; And a nanofiber membrane laminated on both sides of the porous substrate and composed of a mixture of a fiber-forming polymer material and prussian blue, and being spun and integrated by nanofibers having a diameter of 3 μm or less to have three-dimensional micropores .

In the present invention, the above-mentioned prussian blue supported nano fiber composite for adsorbing radioactive cesium is used as a filter medium, and a filter such as a cartridge type, a bent type, and a flat type is formed by processing the filter media, Or solid fine particles adsorbed on cesium can be selectively adsorbed.

According to still another aspect of the present invention, there is provided a method for producing a spinning solution, comprising: preparing a spinning solution by dissolving a mixture of a fiber-forming polymer material and Prussian blue in a single or at least two mixed solvents; Forming a nanofiber membrane on which nanofibers having a diameter of 3 m or less are collected by electrospunning the spinning solution; And complexing the porous substrate to one side or both sides of the nanofiber membrane to form a nanofiber composite. The present invention also provides a method for manufacturing a prussian blue supported nanofiber composite material for adsorbing radioactive cesium.

In the spinning solution, a mixture of the fibrous polymeric material and prussian blue may be contained in an amount of about 10 to 30 wt%.

In the present invention, the composite of the nanofiber membrane and the porous substrate is a method of compositing the nanofiber membrane with a porous substrate (nonwoven fabric, woven fabric, etc.) by using heat fusion bonding or an adhesive agent, and is used for laminating, calendering, hot plate calendering, Embossing, hot melt bonding or the like can be applied, and there is no particular limitation as long as the nanofiber membrane (layer) is not peeled off.

As described above, the nanofiber composite containing the Prussian blue or Prussian blue type metal complex according to the present invention can adsorb radioactive cesium dissolved in contaminated water or leachate with high efficiency and high selectivity.

In addition, the filter media provided with the Prussian blue-supported nanofiber composite of the present invention can separate / recover solid fine particles adsorbed on cesium in the polluted water at the same time.

Further, in the present invention, radioactive cesium can be decontaminated using a nanofiber composite containing a Prussian blue or Prussian blue type metal complex.

Figs. 1 (a) and 1 (b) are schematic views showing the photograph of Prussian blue used in the embodiment of the present invention and the Prussian blue adsorbed cesium, respectively.
FIGS. 2A to 2D are cross-sectional views illustrating the structure of a prussian blue supported nanofiber composite according to an embodiment of the present invention. FIG.
3 (a) and 3 (b) are photographs and scanning electron microscope (SEM) photographs of prussian blue supported PVA nanofibers prepared according to one embodiment of the present invention, respectively.
4 (a) and 4 (b) are SEM photographs and EDX results of prussian blue supported PAN nanofibers prepared according to an embodiment of the present invention, respectively.
5 is a scanning electron microscope (SEM) photograph of prussian blue-supported PVDF nanofiber prepared according to an embodiment of the present invention.
FIG. 6 is a graph showing the results of a comparison between Example 1 (Prussian blue supported PVA nanofiber), Example 2 (Prussian blue supported PAN nanofiber), Example 3 (Prussian blue supported PVDF nanofiber) The adsorption isotherms of cesium chloride on the nanofibers are shown in Fig.

The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which: .

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

2A to 2D are cross-sectional views illustrating the structure of Prussian blue supported nanofiber composite according to the first to fourth embodiments of the present invention, respectively.

The prussian blue supported nanofiber composite material 10a-10c according to the first to third embodiments of the present invention may have a porous substrate (not shown) on one side or both sides of the nanofiber membrane 200 as shown in FIGS. 2A and 2B Layer structure in which the nanofiber membranes 200 and 200a are stacked on both sides of the porous substrate 300 as shown in FIG. 2C.

First, as shown in FIG. 2A, the nanofiber composite material 10a according to the first embodiment of the present invention is made of a fiber-forming polymer material and prussian blue, A nanofiber membrane (200) having three-dimensional micropores integrated by nanofibers of nanofibers; And a porous substrate (100) stacked on one side of the nanofiber membrane (200) to support the nanofiber membrane (200).

As shown in FIG. 2B, the nanofiber composite material 10b according to the second embodiment of the present invention is formed of a fiber-forming polymer material and prussian blue. The nanofiber composite material 10b is electrospun and has a diameter of 3 μm or less A nanofiber membrane (200) having three-dimensional micropores integrated by nanofibers of nanofibers; And a pair of porous substrates 100 and 300 stacked on both sides of the nanofiber membrane 200 to support the nanofiber membrane 200.

As shown in FIG. 2C, the nanofiber composite 10c according to the third embodiment of the present invention includes a porous substrate 300 serving as a support, a pair of porous substrates 300 stacked on both sides of the porous substrate 300, Layer structure including the nanofiber membranes 200 and 200a.

The porous substrate 100 or 300 may be made of a nonwoven fabric, a woven fabric, or the like, and may be made of a material capable of enhancing the handling properties of the nanofiber membrane 200, 200a by supplementing the physical properties of the nanofiber .

The porous substrate (100, 300) is a fiber made of polyester or polyamide system, which is excellent in radiation resistance and is not decomposed by radiation generated by radioactive cesium, and is capable of stably storing filter media such as radioactive waste after recovery of radioactive cesium .

The nanofiber composites 10a-10c according to the first to third embodiments of the present invention are formed by forming nanofiber membranes 200 and 200a and then thermally compressing or laminating the nanofiber membranes 200 and 200a, Or on both sides of the porous substrate 100 or 300. [

In addition, the nanofiber composites 10a-10c according to the first to third embodiments of the present invention can selectively adsorb radioactive cesium dissolved in contaminated water or leachate, or adsorb solid fine particles adsorbed on cesium in contaminated water Is applied to the filter to separate / recover.

For this, the nanofiber composites 10a-10c can be processed to have the same structure as a general filter material so that they can be applied to cartridges, bends, flat plates, and the like.

It is preferable that the constitution of the filter filter material is selected in accordance with the application to be applied so as to have a structure in which the flow rate of the water to be treated and the removal efficiency of the radioactive cesium are high.

The nanofiber composites 10a to 10c are formed in the form of a flat plate filter and require a support having higher strength than the porous substrates 100 and 300 as shown in FIG. .

In consideration of this point, the nanofiber composite 10d according to the fourth embodiment of the present invention can be manufactured, for example, by using the nanofiber membrane 200 of the second embodiment in which the porous substrate 100, 300 is laminated on one side or both sides of the nanofiber membrane 200 Depending on the application applied to the fiber composite 10b, it may be combined with mesh, net, filament, grid, or other type of support layer 400 to provide strength reinforcement. Of course, the support layer 400 may be bonded to the nanofiber composites 10a and 10c according to the first and third embodiments to reinforce the strength.

In the present invention, the nanofiber membranes 200 and 200a preferably have a fiber diameter of 0.05 to 3 占 퐉 and an average pore size of 0.2 to 1.0 占 퐉, and the average pore size of the nanofiber membranes 200 and 200a And the diameters and the average pore size of the nanofibers can be controlled in order to filter the foreign substances contained in the water to be treated in consideration of the intended use. The nanofibers produced by electrospinning are usually less than 1 μm but can be made up to 3 μm.

The nanofiber membranes 200 and 200a used in the nanofiber composites 10a to 10c of the present invention are obtained by electrospinning a spinning solution in which a fiber-forming macromolecule material and prussian blue (PB) The nanofibers carry Prussian blue.

The content of prussian blue contained in the nanofiber is set to be in the range of 5 to 50 wt.% Compared to the fiber-forming polymer. When the content of Prussian blue is less than 5 wt.%, Sufficient cesium adsorption ability is not exhibited. There is a problem that a radioactive defect occurs when nanofibers are formed by electrospinning a dissolved spinning solution mixed with a fiber-forming polymeric material.

In the present invention, at the time of forming the nanofiber membrane, electrospinning can be carried out by blending two or more kinds of fiber-forming polymeric materials, wherein the solvent is selected from those having compatibility with the polymer material to be used, Or a mixture of two or more thereof.

In the present invention, the fibrous polymeric material is not particularly limited to thermosetting and thermoplastic polymers, and may be a polymer in which nanofibers are formed by electrospinning.

In the case of Prussian blue supported nanofibers, the adsorption capacity of cesium ions is strongly influenced by the hydrophilicity of the nanofibers, and therefore, it is preferable that the hydrophobic nanofibers are composed of hydrophobic nanofibers.

The basis weight of the nanofiber forming the nanofiber membrane is preferably set in the range of 0.5 to 50 gsm (gram per square meter) based on the entire spinning solution.

The nanofiber membrane 200, 200a made of Prussian blue-loaded nanofibers is used in nanofiber composites 10a-10c to adsorb radioactive cesium dissolved in contaminated water or leachate with high efficiency and high selectivity, The solid fine particles adsorbed by cesium and the like can be simultaneously separated / recovered.

In this case, the nanofiber membranes 200 and 200a are integrated by nanofibers having a diameter of 3 m or less and have micropores of a three-dimensional open structure, and the average pore size is 0.2 to 1.0 占 퐉. The treated water passing through the pores can be separated / recovered by filtering the solid fine particles adsorbed on cesium in the polluted water.

The average pore size of the nanofiber membranes 200 and 200a of 0.2 to 1.0 mu m has a size capable of filtering particulate matter (PM) 2.5 when the particles are 2.5 mu m or less.

Further, the nanofiber composites 10a-10c have a filtering function to block various foreign substances having a size of 1.0 탆 or less or heavy metals, pathogens, etc. from passing through the pores.

Hereinafter, a method for producing the nanofiber composites 10a-10c will be described for each process step.

A. Manufacture of spinning liquid of fiber-forming polymeric material and Prussian blue

Prepolymer is prepared by mixing the fiber-forming polymer and prussian blue so that the blending amount of prussian blue is set in the range of 5 to 50 wt.% Of the fiber-forming polymer, and dissolving the mixture in a solvent at a spinnable concentration. The concentration of the spinning solution is suitable to maintain the fibrous morphology during spinning, and the mixture of the polymer material and prussian blue in the spinning solution is preferably in the range of about 10 to 30 wt%.

When the ratio of the mixture is less than 10 wt%, a drop due to a low concentration is formed rather than forming nanofibers during electrospinning, so that fibers are often not formed. When the amount exceeds 30 wt%, the content Is too large to form nanofibers due to poor spinning.

Particularly, when polymer materials having two or more components are blended and then spun, the polymer material and the solvent should be compatible with each other and the conditions under which phase separation does not occur should be satisfied. The solvent may be used alone or in combination of two or more. If the volatility of the solvent is excessively high or low, it may cause radiation trouble. Therefore, it is preferable to prepare the spinning solution while sufficiently considering the volatilization of the solvent.

B. Formation of Polymer Nanofiber Membrane

The prepared spinning solution is transferred to a nozzle pack equipped with a spinning nozzle by using a metering pump, and a voltage is applied to the spinning nozzle using a high voltage regulating device to perform electrospinning. The voltage to be used is a voltage capable of radiation at 120kV or less, and the collector plate can be grounded or charged with negative (-) polarity.

The current collecting plate is preferably made of a transfer sheet such as an electrically conductive metal or a release paper. It is preferable to use a suction collector in order to smooth the focusing of the spinning fiber in the case of the collector plate. It is preferable to adjust the distance from the spinning nozzle to the collector plate within the range of 5 to 50 cm.

The discharge amount during spinning is discharged to a transfer sheet at 0.01 to 5 cc / holemin per hole using a metering pump to form a nanofiber layer and the nanofiber layer 200 is separated from the transfer sheet to obtain a nanofiber membrane 200 have.

Preferably, the electrospinning is conducted in an environment of 30 to 70% relative humidity in a spinning chamber capable of controlling temperature and humidity during spinning. Particularly, in order to improve the handling property, it is preferable to spin the nanofiber membrane 200 so that the thickness of the nanofiber membrane 200 becomes about 5 to 200 mu m after thermocompression.

The nanofiber membrane 200 can be formed by electrospinning a spinning solution of a single polymer, or by preparing two or more kinds of polymer spinning solutions and cross-electrospun each polymer spinning solution.

C. Thermocompression or thermal bonding (calendering) or lamination

The electrospun nanofiber membrane 200 may have weak bonding force between the nanofibers, and the spun fibers may be desorbed or lint may be generated, so that handling properties need to be improved. As a general method for improving the handling property of the nanofiber membrane 200, a method of calibrating the nanofiber membrane 200 by using a calendar device in a temperature range between a glass transition temperature (Tg) and a melting temperature (Tm) A method is employed in which fusion occurs at the interface between the nanofibers and the nanofibers through heat treatment such as pressing or calendering.

When the laminated body having the nanofiber membrane 200 inserted between the porous substrates 100 and 300 is heated and calendered in the calendering apparatus to adjust the thickness of the laminated body, the porous nanofiber membrane 200 and the porous substrate 100, 300) having a three-layer structure is obtained.

It is also possible that the nanofiber membrane 200 is first calendered and the porous substrate 100 or 300 is laminated on one side or both sides of the nanofiber membrane 200.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples are intended to further illustrate the present invention, and the scope of the present invention is not limited by these examples.

(Example 1) Production of PB-supported PVA nanofiber

(PVA) (molecular weight: 500, degree of saponification: 90%) and water as a solvent such as dibenzoyl peroxide (2 wt%) and prussian blue (PB) ) (50/50 wt.%) Mixed solvent at a concentration of 15 wt.% And subjected to electrospinning and crosslinked at 150 ° C for 1 minute by hot air drying to prepare a sample of Example 1.

A photograph and a scanning electron microscope (SEM) photograph of a prussian blue supported PVA nanofiber sample prepared according to Example 1 of the present invention are shown in FIGS. 3 (a) and 3 (b), respectively. In FIG. 3 (a), Prussian Blue Midlands PVA nanofibers are shown on the left, and Prussian blue supported nanofibers are shown on the right.

(Example 2) Preparation of PB-supported PAN nanofiber

The nanofibers of Example 2 were prepared in the same manner as in Example 1 except that a spinning solution was prepared so as to have a concentration of 15 wt% in a solvent DMAc (dimethylacetamide) such that the PB was made into 20 wt% of PB in polyacrylonitrile instead of PVA, Respectively.

A scanning electron microscope (SEM) photograph and a graph showing the results of EDX (Energy Dispersive X-ray) of a Prussian blue supported PAN nanofiber sample prepared according to Example 2 of the present invention are shown in FIGS. 4 (a) (b).

(Example 3) Production of PB-supported PVDF nanofiber

The nanofibers of Example 3 were prepared in the same manner as in Example 1 except that instead of PVA, a solution of PVDF (polyvinylidene fluoride) was added to the solvent DMAc at a concentration of 15 wt.% So that the PB was 20 wt.%. Respectively.

5 is a scanning electron microscope (SEM) photograph of a prussian blue supported PVDF nanofiber sample prepared according to Example 3 of the present invention.

(Comparative Example)

To evaluate the adsorption amount of nanofiber itself on cesium chloride (CsCl ₂ ), a spinning solution was prepared so as to have a content of PAN of 15 wt.% In a DMAc solvent. The spinning solution was electrospun in the same manner as in Example 2, Respectively.

(Evaluation of cesium ion adsorption capacity)

The Prussian blue-supported nanofibers obtained in Example 1 (Prussian blue-supported PVA nanofibers) obtained in the above, Example 2 (Prussian blue-supported PAN nanofibers) and Example 3 (Prussian blue-supported PVDF nanofibers) Adsorption equilibrium experiments were carried out to investigate the adsorption isotherms and adsorption capacities of cesium ions in samples and Comparative Examples in which Prussian blue was not supported.

25 ml of a solution having an initial concentration of cesium chloride (CsCl ₂ ) of 100 ppm was taken, and 1 g of each Prussian blue supported nanofiber sample prepared by the method of Examples 1 to 3 was added thereto. And adsorbed at 100 rpm at 30 DEG C for 48 hours. After the adsorption equilibrium, the adsorbate solution was filtered with a PTFE syringe filter (Whatman, 0.45um), diluted 1000 times, and the residual concentration of cesium in the solution was measured by ICP-MS (inductively coupled plasma mass spectrometer).

Figure 6 is a graph showing the results of a comparison between Example 1 (Prussian blue-supported PVA nanofibers) (●), Example 2 (Prussian blue-supported PAN nanofibers) (○), Example 3 ) And a comparative example (PAN nanofibers) (?) In the adsorption capacity of cesium chloride.

As shown in the graph of FIG. 6, it was found that the adsorption capacity of the Prussian blue-supported nanofibers was greatly affected by the hydrophilicity of the nanofibers, and the nanofiber itself had some ability to adsorb the cesium ions .

The adsorption capacities of Examples 1, 2, 3 and Comparative Examples were 107.7 mg / g, 105.82 mg / g, 15.2 mg / g and 3.4 mg / g, respectively. That is, the adsorption capacities of the nanofibers of Example 1 and Example 2 were almost the same as those of the nanofibers of Comparative Example 1, whereas the adsorption capacity of the hydrophobic nanofibers of Example 3 was relatively higher than that of Example 1 and Example 2 Respectively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

The present invention can be applied to the manufacture of nanofiber composites carrying Prussian blue or Prussian blue type metal complexes capable of adsorbing radioactive cesium with high efficiency and high selectivity among the radionuclides and to the field of decontamination of radioactive cesium using them .

10a-10c: nanofiber composite 100, 300: porous substrate
200, 200a: nanofiber membrane 400: support layer

Claims (11)

A nanofiber membrane comprising a mixture of a fiber-forming polymer material and prussian blue, and having a three-dimensional micropores that are radiated and integrated by nanofibers having a diameter of 3 μm or less; And
And a porous substrate laminated on one side or both sides of the nanofiber membrane to support the nanofiber membrane,
The content of prussian blue in the nanofiber is set to be in the range of 5 to 50 wt.% Relative to the fiber-forming polymer, and the basis weight of the nanofiber is in the range of 0.5 to 50 gsm (gram per square meter) Prussian blue supported nanofiber composite for radioactive cesium adsorption set. delete The method according to claim 1,
Wherein said nanofiber membrane has an average pore size of 0.2 to 1.0 탆 and a fiber diameter of 0.05 to 3 탆. The method according to claim 1,
Wherein the porous substrate is a nonwoven fabric or a woven fabric, the Prussian blue-supported nanofiber composite for adsorbing radioactive cesium. delete The method according to claim 1,
Wherein the nanofiber composite further comprises a supporting layer composed of a mesh, a mesh or a filament on the outer surface of the nanofiber composite, the Prussian blue supported nanofiber composite for adsorbing radioactive cesium. A porous substrate serving as a support; And
And a nanofiber membrane laminated on both sides of the porous substrate and composed of a mixture of a fiber-forming polymer material and prussian blue, and being radiated and integrated by nanofibers having a diameter of 3 탆 or less to have three-dimensional micropores,
The content of prussian blue in the nanofiber is set to be in the range of 5 to 50 wt.% Relative to the fiber-forming polymer, and the basis weight of the nanofiber is in the range of 0.5 to 50 gsm (gram per square meter) Prussian blue supported nanofiber composite for radioactive cesium adsorption set. 7. A filter media comprising a Prussian blue-supported nano fiber composite for adsorbing radioactive cesium according to any one of claims 1, 3, 4, 6, 7, A method for decontaminating radioactive cesium selectively adsorbing radioactive cesium using the filter media according to claim 8. delete delete

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