WO2004091785A1 - 触媒担持繊維構造体およびその製造方法 - Google Patents
触媒担持繊維構造体およびその製造方法 Download PDFInfo
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- WO2004091785A1 WO2004091785A1 PCT/JP2004/005070 JP2004005070W WO2004091785A1 WO 2004091785 A1 WO2004091785 A1 WO 2004091785A1 JP 2004005070 W JP2004005070 W JP 2004005070W WO 2004091785 A1 WO2004091785 A1 WO 2004091785A1
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Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
- D01D5/0038—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion the fibre formed by solvent evaporation, i.e. dry electro-spinning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
-
- B01J35/39—
-
- B01J35/58—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic System; Titanates; Zirconates; Stannates; Plumbates
Definitions
- the present invention relates to a catalyst-supporting fiber structure and a method for producing the same.
- the present invention relates to a catalyst-supporting fiber structure in which a catalyst is supported on fibers constituting a fiber structure, and a method for producing the same.
- VOCs volatile organic compounds
- titanium oxide which has a photocatalytic effect, has attracted attention as a catalyst that can decompose harmful substances.
- a photocatalyst consisting of titanium oxide or. £> is irradiated with light having a wavelength having energy equal to or greater than the band gap. Then, photoexcitation generates electrons in the conduction band and holes in the valence band. The electrons and holes generated by the photoexcitation generate high reducing power and oxidizing power, which are used to decompose harmful substances. It is to use.
- a photocatalytic whisker in which a photocatalytic titanium oxide is supported on a porous whisker having a specific specific surface area has been proposed (see, for example, Patent Document 2).
- the whiskers obtained by this method for actual wastewater treatment the whiskers must be further contained in paints, rubbers, etc., and the operation is complicated, and the whiskers in the final use form There was a problem that the amount of catalyst carried was small.
- titania fiber for photocatalyst in which titanium oxide is supported on the surface of titaure fiber having a specific surface area or less has been proposed (for example, see Patent Document 3).
- the titania fiber of this method also has a problem that the amount of supported catalyst is small.
- titanium fibers have poor flexibility, there is also a problem that the form to be used is limited.
- a flexible material may be used, for example, to support a photocatalyst on a woven or nonwoven fabric, and more specifically, a photocatalyst may be supported on an aramid fiber cloth, a fluororesin cloth, or the like.
- aramid fiber cloth a fluororesin cloth, or the like.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-288569
- Patent Document 2 Japanese Patent Application Laid-Open No. 2000-271488
- Patent Document 3 Japanese Patent Application Laid-Open No. 2000-218170
- Patent Document 4 Japanese Patent Application Laid-Open No. 9-267043 Disclosure of the Invention
- the first object of the present invention is to solve the problems of the prior art,
- An object of the present invention is to provide a fiber structure having both sufficient flexibility and catalyst carrying performance.
- Still another object of the present invention is to provide a method for producing a fibrous structure having a high degradability of harmful substances by an extremely simple method.
- FIG. 1 is a schematic diagram of a manufacturing apparatus for explaining one embodiment of the manufacturing method of the present invention.
- FIG. 2 is a schematic diagram of a manufacturing apparatus for explaining one embodiment of the manufacturing method of the present invention.
- FIG. 3 is an electron micrograph (200 ⁇ magnification) of the surface of the fibrous structure obtained in the operation of Example 1.
- FIG. 4 is an electron micrograph (magnification: 800,000) of the surface of the fibrous structure obtained by the operation of Example 1 taken with a scanning electron microscope.
- FIG. 5 is an electron micrograph (magnification: 500,000) of the surface of the catalyst-carrying fibrous structure obtained by the operation of Example 1 taken with a scanning electron microscope.
- FIG. 6 is an electron micrograph (200 ⁇ magnification) of the surface of the fibrous structure obtained by the operation of Example 2 taken with a scanning electron microscope.
- FIG. 7 is an electron micrograph (magnification: 800 ⁇ ) of the surface of the fibrous structure obtained by the operation of Example 2 taken with a scanning electron microscope.
- FIG. 8 is an electron micrograph (200 ⁇ magnification) of the surface of the fibrous structure obtained by the operation of Example 3 taken with a scanning electron microscope.
- FIG. 9 is an electron micrograph (200 ⁇ magnification) of the surface of the fibrous structure obtained by the operation of Example 4 taken with a scanning electron microscope.
- FIG. 10 is an electron micrograph (magnification: 800 ⁇ ) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 5 taken with a scanning electron microscope.
- FIG. 11 is an electron micrograph (magnification: 20000) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 5 taken with a 5-scanning electron microscope.
- FIG. 12 is an X-ray diffraction pattern of the catalyst-supporting fiber structure obtained by the operation of Example 5.
- the vertical axis represents the X-ray diffraction intensity (cps).
- the horizontal axis indicates the diffraction angle of 2 ° (deg.).
- FIG. 13 is an X-ray diffraction pattern of the fibrous structure obtained by the operation of Comparative Example 3.
- the vertical axis represents the X-ray diffraction intensity (cps)
- the horizontal axis represents the horizontal axis.
- the axis has a diffraction angle of 2 ° (deg.).
- the first 4 figures electron micrograph (shooting magnification 8 0 0 0 times) ID Oh at O 0 to the surface of the obtained catalyst-supporting fiber structure in operation taken with a scanning electron microscope in Example 6
- FIG. 15 is an electron micrograph (magnification: 800 ⁇ ) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 7 taken with a scanning electron microscope.
- FIG. 16 is an electron micrograph (200 ⁇ magnification) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 8 taken with a 20-scanning electron microscope.
- FIG. 17 is an electron micrograph (magnification: 800,000) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 9 taken with a scanning electron microscope.
- FIG. 18 shows the surface of the catalyst-supporting fiber structure obtained by the operation of Example 10. Micrograph of a photograph taken with a scanning electron microscope (magnification: 800,000)
- FIG. 19 is an electron micrograph (magnification: 2000 ⁇ ) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 11 taken with a scanning electron microscope.
- FIG. 20 is an electron micrograph (magnification: 2000 ⁇ ) of a surface of the catalyst-supporting fiber structure obtained by the operation of Example 12 taken with a scanning electron microscope.
- FIG. 21 is an electron micrograph (200 ⁇ magnification) of the surface of the catalyst-supporting fiber structure obtained by the operation of Example 13 taken with a scanning electron microscope.
- FIG. 22 is an electron micrograph (magnification: 800 ⁇ ) of the surface of the fibrous structure obtained by the operation of Comparative Example 4 taken with a scanning electron microscope.
- FIG. 23 is an electron micrograph (magnification: 800,000) of the surface of the fibrous structure obtained by the operation of Comparative Example 5, taken with a scanning electron microscope.
- fibrous structure refers to a three-dimensional structure formed by subjecting a fiber to an operation such as weaving, knitting, or lamination.
- a preferable example is a nonwoven fabric.
- the average fiber diameter of the fibers forming the fiber structure of the present invention must be 1 am or less. If the average fiber diameter exceeds 1 ⁇ , the specific surface area of the fiber becomes small, so that the amount of the catalyst that can be supported becomes small. If the average diameter of the fibers is at least 0.01 / m, the strength of the obtained fiber structure is sufficient. Become.
- the average diameter of the fibers constituting the fibrous structure is preferably in the range of 0.01 to 0.7 ⁇ .
- the fiber structure of the present invention is substantially free of fibers having a fiber length of 20 ⁇ m or less.
- substantially not included means that no fiber having a fiber length of 20 / im or less is observed even when an arbitrary location is observed with a scanning electron microscope. If the fiber length is less than 20 ⁇ , the mechanical strength of the obtained fiber structure is insufficient, which is not preferable.
- the catalyst supported on the fibers constituting the fiber structure is not particularly limited as long as it is capable of decomposing harmful substances.
- the catalyst include a photocatalyst such as titanium oxide, Ringuchi fen, and fly ash.
- Inorganic compounds white rot fungi, microbial catalysts such as trichloroethylene degrading bacteria, and various enzymes.
- it is preferable to use an inorganic compound from the viewpoint of handleability and activity and particularly preferable is a photocatalyst, and particularly preferable is titanium oxide.
- fine particles are preferred because they are easily carried on fibers.
- a photocatalyst When a photocatalyst is used as the catalyst, it is more preferable that a part of the surface of the photocatalyst be coated with another inorganic compound, because the catalyst-supporting fiber structure exhibits high catalytic activity.
- Other inorganic compounds that coat the surface of the photocatalyst include, for example, ceramics such as silica apatite.
- the catalyst may be in any supported state as long as the catalyst is supported on the fibers constituting the fiber structure.
- the encapsulated catalyst particles are encapsulated in the non-contact portion between the catalyst particles and the fibers constituting the fiber structure, and the surface of the encapsulated catalyst particles does not contact the fibers with the fibers. It can be in a state that includes a part.
- the term “encapsulation” refers to a state in which the catalyst is held so as not to slip off from the fibrous structure.
- the catalyst particles have at least one or more fibers in contact with the surface thereof It is preferable that the catalyst particles be buried in the fibrous structure.
- the fiber structure in the loaded state of (b) has a smaller exposed area of the catalyst surface than the loaded state of (a), but the catalyst is less likely to fall off from the catalyst fiber structure. It can be used for applications in which a factor of catalyst dropout is likely to occur, which is not suitable for a supported fiber structure.
- the fiber structure in the loaded state (c) is intermediate between the loaded state (a) and the loaded state (c).
- the catalyst particle size in the loaded state (c), the catalyst particle size must be in the range of 1 to 10 ° m. If the particle diameter is smaller than 1 ⁇ m, the specific surface area of the catalyst that can contribute to the reaction increases, but the absolute surface area is undesirably too small. When the value exceeds ⁇ ⁇ ⁇ , the absolute area of the catalyst that can contribute to the reaction increases, but the The specific surface area is too small.
- the particle diameter as used herein refers to the average value of the largest part of the diameters of the particles supported in the fibrous structure.
- the value of the particle size of the aggregate formed by agglomeration in the body may be used. .
- a more preferred particle size is 1.5 ⁇ n! 330 ⁇ m.
- the fiber structure in the supported state of (b) is disposed on the outermost side
- the fiber structure in the supported state of (a) is disposed on the innermost side to form the entire fiber structure.
- the fibers forming the fibrous structure of the present invention include those made of organic polymers such as synthetic polymers and natural polymers, and inorganic compounds such as glass fibers and titania fibers. What consists of an organic polymer is preferable from a property. .
- organic polymer examples include polyacrylonitrile, polymethyl methacrylate, polyethyl methacrylate, polynormal propyl methacrylate, polynormal butyl methacrylate, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, and polyacryl acrylonitrile methacrylate.
- Copolymer polyvinylidene chloride, polyvinyl chloride, polyvinylidene chloride-acrylate copolymer, polyethylene , Polypropylene, poly (4-methylmetholepentene) -1, polystyrene, aramide, polyparaphenylene terephthalamide, polyparaphenylene terephthalamide 3,4, oxydiphenylene terephthalamide copolymer, polymetaphenylene isophthalamide, polybenzimidazole Parafenelenpyromelli tomid, poly-4,4, oxydiffeuuren pyromellitomid, polyvininoleanoreconore, cenorreose, cenorreose diacetate, senororostriacetate, methinorecenorerose, propinorecerenolace, peniless Loose, Senorelose acetate Butyrate, Polyethylene sulfide, Polyvinyl acetate, Polyethylene ter
- Examples of the above selection include, for example, polyacrylonitrile and a copolymer thereof, or a compound obtained by heat-treating the same, depending on the handling properties and physical properties.
- organic polymers containing halogen elements for example, polyvinyl chloride, polyvinylidene chloride, polyvinylidene chloride-atalylate copolymer, polyvinylidene fluoride
- Polyvinyl bromide, polychlorinated trifluoroethylene, polychloroprene, etc. especially polyvinyl chloride may be used, which makes the fiber structure biodegradable and decomposes naturally in the soil after long-term use
- polylactic acid may be used.
- the polymer may be mixed with an emulsion, or an organic or inorganic powder as necessary. Can also be.
- the catalyst-supporting fiber structure of the present invention may be used alone, it may be used in combination with other members according to handleability and other requirements.
- a nonwoven fabric, a woven fabric, a film, or the like that can be a supporting base material is used as a collecting substrate, and a fiber laminate is formed thereon, thereby creating a member combining the supporting base material and the fiber laminate.
- the catalyst-supporting fiber structure of the present invention may employ any production method as long as a catalyst-supporting fiber structure having the above average fiber diameter and fiber length can be obtained.
- a method for manufacturing the above-described (a) to (c) supported states will be described below.
- the fiber structure having the loaded state of (a) is, for example, a step of producing a solution by dissolving a fiber-forming organic polymer; a step of spinning the solution by an electrostatic spinning method; It can be obtained by a method for producing a catalyst-carrying fiber structure, comprising the steps of: obtaining a fiber structure accumulated on a collecting substrate by spinning; and supporting a catalyst on the fiber structure.
- a solution in which a fiber-forming compound is dissolved is discharged into an electrostatic field formed between the electrodes, the solution is drawn toward the electrodes, and the formed fibrous substance is removed.
- the above-mentioned electrode can be used as long as it shows conductivity of any metal, inorganic substance or organic substance, and has a thin film of conductive metal, inorganic substance or organic substance on an insulator. May be.
- the electrostatic field is formed between a pair or a plurality of electrodes, and a high voltage may be applied to any of the electrodes.
- a high voltage may be applied to any of the electrodes. This includes, for example, two electrodes with different voltage values (e.g., 15 kV and 10 kV) and three electrodes connected to earth, or more than three electrodes. This includes the case where a number of electrodes are used.
- a fiber-forming organic polymer is dissolved to produce a solution.
- the concentration of the fiber-forming organic polymer in the solution is preferably 1 to 30% by weight. If the concentration is less than 1% by weight, the concentration is too low and it is difficult to form a fiber structure, which is not preferable. On the other hand, if it is larger than 30% by weight, the average diameter of the obtained fiber becomes large, which is not preferable. A more preferred concentration is 2 to 20% by weight.
- a fiber-forming organic polymer is dissolved and evaporated at the stage of spinning by the electrospinning method.
- acetone for example, acetone, chlorophonolem, ethanolanole, isoprononeole, methanoleone, tonolene, tetrahydrofuran, water, benzene, benzylisolenocore, 1,4-dioxane, propanol, methylene chloride, carbon tetrachloride, cyclohexane, cyclohexanone, phenol, pyridine, trichloroethane, acetic acid, formic acid, hexafluoroisopropanol, hexafluoroacetone, N
- Examples include N-dimethylformamide, acetonitrile, N-methyl monoleforin-N-oxide, 1,3-dioxolane, methinolethynoleketone, N-methylpyrrolidone, and mixed solvents of the above solvents.
- Any method can be used to discharge the solution into the electrostatic field. For example, by supplying the solution to a nozzle, the solution is placed at an appropriate position in the electrostatic field, and the solution is discharged from the nozzle. You can make it into a fiber by drawing it with an electric field.
- a needle-shaped solution jet nozzle (Fig. 1, Fig. 6) to which a voltage is applied by a high voltage generator (Fig. 1, 6).
- 1 Install the solution (Fig. 1) and guide the solution (Fig. 1 2) to the tip of the solution ejection nozzle. Dispose the tip of the solution discharge nozzle (Fig. 1) at an appropriate distance from the grounded fibrous substance collecting electrode (Fig. 1 5), and allow the solution (Fig. 1 2) to discharge the solution outflow nozzle (Fig. 1).
- fine droplets (not shown) of the solution can be introduced into an electrostatic field, and the only requirement is that the solution (FIG. ) Is placed in an electrostatic field and is kept away from the fibrous substance collecting electrode (Fig. 2, 5) such that fibrosis can occur.
- an electrode (Fig. 4) that directly opposes the fibrous substance collecting electrode directly into the solution (Fig. 2) in the solution holding tank (Fig. 2) with the solution ejection nozzle (Fig. 2). ) Can also be imported.
- the applied electrostatic potential is generally 3 to 100 kV, preferably 5 to 50 kV, and more preferably 5 to 30 kV.
- the desired potential may be created by any suitable method known in the art.
- the electrodes also serve as the collecting substrate, but by installing a potential collecting substrate between the electrodes, a collecting substrate is provided separately from the electrodes, and the fiber laminate is collected there. You can do it.
- a belt shape By installing a substance between the electrodes and using it as a collection substrate, continuous production is possible.
- the solvent evaporates according to the conditions to form a fibrous substance.
- the solvent evaporates completely before being collected on the collecting substrate, but if the evaporation of the solvent is insufficient, spinning may be performed under reduced pressure.
- a fiber structure satisfying at least the fiber average diameter and the fiber length is formed.
- the spinning temperature depends on the evaporation behavior of the solvent and the viscosity of the spinning solution, but is usually in the range of 0 to 50 ° C.
- a catalyst may be supported on the fiber structure obtained by the above-mentioned electrostatic spinning method, and the method for supporting the catalyst is not particularly limited, and the fiber structure is immersed in a liquid containing the catalyst.
- the catalyst it is preferable that the catalyst is brought into contact with the fiber surface, or a liquid containing the catalyst is applied to the fiber structure by an operation such as spray coating, because the operation is easy and uniform loading is possible.
- the catalyst-containing liquid preferably contains a component that can serve as a binder between the fibrous structure and the catalyst.
- the fiber structure having the above-mentioned (b) carrying state is, for example, a step of producing a solution by dissolving a fiber-forming organic polymer and a catalyst precursor in a solvent; Spinning by a spinning method, obtaining a fiber structure accumulated on a collecting substrate by the spinning, and processing a catalyst precursor contained in the fiber structure to form a catalyst. It can be obtained by a method for producing a supported fiber structure.
- a solution is produced by dissolving a fiber-forming organic polymer and a catalyst precursor.
- a catalyst precursor for example, An inorganic compound that can be a catalyst by a sol-gel reaction can be used.
- the inorganic compound include metal alkoxides and metal chlorides. Specifically, titanium alkoxides, tin alkoxides, and silicon alkoxides And aluminum alkoxide can be mentioned as preferable examples. Among them, titanium alkoxide is particularly preferable. Further, as the above-mentioned titanium alkoxide, titanium tetraisopropoxide, titanium tetrabutoxide and the like can be preferably used from the viewpoint of availability.
- the concentration of the fiber-forming organic polymer with respect to the solvent in the solution is preferably 1 to 30% by weight. If the concentration of the fiber-forming organic polymer is less than 1% by weight, the concentration is too low and it is difficult to form a fiber structure, which is not preferable. On the other hand, if it is more than 30% by weight, the fiber diameter of the obtained fiber structure is undesirably large. More preferably, the concentration of the fiber-forming organic polymer in the solvent in the solution is 2 to 20% by weight.
- the concentration of the catalyst precursor in the solvent in the solution is preferably 1 to 30% by weight. If the concentration of the catalyst precursor is less than 1% by weight, the amount of generated catalyst is reduced, which is not preferable. On the other hand, if it is more than 30% by weight, it is difficult to form a fiber structure, which is not preferable. A more preferred concentration of the catalyst precursor relative to the solvent in the solution is 2 to 20% by weight.
- a single solvent may be used alone, or a plurality of solvents may be combined.
- the solvent is not particularly limited as long as it is capable of dissolving the fiber-forming organic polymer and the catalyst precursor and evaporating at the stage of spinning by the electrospinning method to form fibers.
- the solvent used in producing the supported state of (a) can be used.
- the coordinating compound is further incorporated into a solvent. May be combined.
- the coordinating compound is not limited as long as it can control a catalyst precursor reaction and form a fibrous structure. Examples thereof include carboxylic acids, amides, esters, ketones, phosphines, and the like. Examples include ethers, alcohols, and thiols.
- a catalyst is formed by treating a catalyst precursor contained in the fiber structure obtained by the electrostatic spinning method.
- the fiber structure obtained by the above-mentioned electrostatic spinning method is placed in a tightly closed container such as an autoclave, and is placed in a solution or its vapor.
- Hydrothermal treatment for performing heat treatment may be performed.
- the hydrothermal treatment method if it is possible to promote the hydrolysis of the residual metal alkoxide contained in the fiber structure, promote the polycondensation reaction of the metal hydroxide, and promote the crystallization of the metal oxide,
- the treatment temperature is preferably from 50 ° C to 250 ° C, and more preferably from 70 ° C to 200 ° C.
- the treatment temperature is lower than 50 ° C, crystallization of the metal oxide is not promoted, which is not preferable. If the treatment temperature is higher than 250 ° C, the strength of the organic polymer used as the base material is lowered, which is not preferable.
- pure water is usually used, but preferably has a pH of 2 to 10, and more preferably has a pH of 3 to 9.
- the fibrous structure may be dried under hot air.
- the temperature is preferably from 50 ° C to 150 ° C, more preferably from 80 ° C to 120 ° C.
- the description of (a) the method for manufacturing a supported fiber structure can be directly used.
- the fiber structure having the above-mentioned supporting state (c) is, for example, a step of producing a dispersion solution in which catalyst particles are further dispersed in a solution obtained by dissolving a fiber-forming compound in a solvent; A step of spinning the dispersion solution by an electrospinning method, and a step of obtaining a catalyst-carrying fiber structure accumulated on a collecting substrate by the spinning. Can be done.
- the concentration of the fiber-forming compound in the dispersion solution in the production method of the present invention is preferably 1 to 30% by weight. If the concentration of the fiber-forming compound is less than 1% by weight, the concentration is too low and it is difficult to form a fiber structure, which is not preferable. On the other hand, if the content is more than 30% by weight, the fiber diameter of the obtained fiber structure becomes large, which is not preferable. A more preferred concentration of the fiber-forming compound is 2 to 20% by weight.
- the dispersion concentration of the catalyst particles in the dispersion solution in the production method of the present invention is preferably 0.1 to 30% by weight.
- the dispersion concentration of the catalyst particles is less than 0.1%, the catalytic activity of the obtained fiber structure is undesirably too low.
- the strength of the obtained fibrous structure decreases, which is not preferable.
- a more preferred dispersion concentration of the catalyst particles is 0.5 to 25% by weight.
- the catalyst particles may be dispersed, or the fiber-forming compound and the catalyst particles may be simultaneously added to the solvent.
- the fiber-forming compound may be dissolved in a solvent to which catalyst particles have been added in advance.
- the method for dispersing the catalyst particles is not particularly limited, and examples thereof include stirring and ultrasonic treatment.
- the surface of the obtained fiber structure was randomly photographed from a photograph taken by scanning electron microscopy (“S-240”, magnification: 800,000, manufactured by Hitachi, Ltd.).
- the diameter is the longest part of the catalyst particles within the range that can be confirmed in the photograph.
- a fibrous structure to be a sample was cut out to a length of 2 cm and a width of 2 cm, and this was immersed in 5 ml of a 10 m / m aqueous solution of methylenepur.
- the absorbance at 665 nm of the obtained methylene blue aqueous solution was measured using “U V-2400 PCJ” manufactured by Shimadzu Corporation.
- the methylene blue aqueous solution in which the fiber structure supporting the catalyst was immersed and the catalyst was not supported Compared with the aqueous solution of methylene pull in which the fiber structure is immersed, the aqueous solution of methylene pull in which the fiber structure supporting the catalyst is immersed has a lower absorbance, and the high catalytic activity can be evaluated by the decomposition of methylene blue.
- Example 2 the obtained fiber structure was immersed in a photocatalyst coating agent (“PARTITA 567” manufactured by Nippon Parker Rising Co., Ltd.) for 10 minutes and then dried to obtain a catalyst-supporting fiber structure.
- Table 1 shows the finally obtained catalytic activity evaluation results.
- FIG. 5 shows a scanning electron micrograph of the obtained catalyst-supporting fiber structure.
- Example 1 after forming the fibrous structure, the same operation was performed except that heat treatment was performed at 300 for 3 hours.
- Example 1 The same operation as in Example 1 was performed on the obtained fiber structure to obtain a catalyst-supporting fiber structure. Table 1 shows the finally obtained catalytic activity evaluation results. Comparative Example 1
- Polyacrylonitrile (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in ⁇ , dimethylformamide (manufactured by Wako Pure Chemical Industries, Ltd., reagent grade) to prepare a dope with a polymer concentration of 7.5%.
- Example 3 The same operation as in Example 1 was performed on the obtained fiber assembly to obtain a catalyst-supporting fiber structure. Table 1 shows the finally obtained catalytic activity evaluation results. In addition, the obtained fiber structure lacked flexibility. Example 3
- the basis weight of the obtained fiber structure was 36 gZm 2 , and the thickness was a 0.2 mm nonwoven fabric.
- the obtained fiber structure was observed with a scanning electron microscope (S-2400, manufactured by Hitachi, Ltd.), the average fiber diameter was 0.4 ⁇ , and fibers with a fiber length of 20 ⁇ or less were observed. It was not.
- Fig. 8 shows a scanning electron micrograph of the obtained fiber structure surface.
- a photocatalyst coating agent (“PARTITANI 5607” manufactured by Nippon Parkerizing Co., Ltd.) was diluted with a mixed solvent of methanol and disopropanol (1/1; weight ratio) so that the catalyst concentration became 1% by weight, and coated. A solution was made. Using an air brush (Kiso Power Tool Co., Ltd. “ ⁇ 1 306”: nozzle diameter 0.4 mm), apply 0.1 lm l Zcm 2 was applied to the fiber structure at a coating amount of 1 to obtain a catalyst-carrying fiber structure. Table 1 shows the catalytic activity evaluation results.
- Example 4 shows the catalytic activity evaluation results.
- Example 3 a similar operation was carried out except that the discharge time of the solution was changed from 60 minutes to 15 minutes, to obtain a nonwoven fabric having a basis weight of 7.8 g / m 2 and a thickness of 0.05 mm. A fibrous structure was formed.
- Fig. 9 shows a scanning electron micrograph of the surface of the obtained fiber structure.
- Example 5 A fabric (83 g / m 2 ) of 84 dtex x25 filament polychlorinated bifilament multifilament (having a single fiber diameter of about 17.54 ⁇ ) was immersed in the coating solution in the same manner as in Example 2 to prepare a catalyst-supporting fiber. A structure was obtained. Table 1 shows the catalytic activity evaluation results. The obtained non-woven fabric lacked flexibility.
- Example 5
- the inner diameter of the ejection nozzle was 0.8 mm, the voltage was 12 kV, and the distance from the ejection nozzle to the fibrous material collecting electrode was 15 cm.
- the obtained fibrous structure was placed in an autoclave and adjusted to pH 3
- the sample was kept at 80 ° C. for 17 hours in an aqueous solution, and the sample was washed with ion-exchanged water and dried to obtain a catalyst-supporting fiber structure having a basis weight of 32 gcm 2 .
- the obtained catalyst-supporting fiber structure was observed with a scanning electron microscope (“S-2400” manufactured by Hitachi, Ltd.), the average fiber diameter was 0.5 ⁇ m, and the average fiber diameter was 20 ⁇ m or less. No fibers were observed.
- Example 6 1 part by weight of polyvinyl chloride having a polymerization degree of 1300, tetrahydrofuran (special grade, manufactured by Wako Pure Chemical Industries, Ltd.) 4.5 parts by weight, N, N-dimethylform
- Example 7 1) is 0.8 mm, the solution supply speed is 20 ⁇ ⁇ , the voltage is 12 kV, and the fibrous substance collecting electrode (Fig. The distance to Fig. 1 5) was 15 cm.
- the basis weight of the obtained fiber structure was 5 g / m 2 .
- a scanning electron micrograph of the surface of the obtained fiber structure is shown in FIG. 14. The average fiber diameter was 0.15 m, and fibers having a fiber length of 20 ⁇ m or less were not observed.
- the catalyst particle size was 3 m. Table 1 shows the results of evaluating the catalytic activity of the obtained catalyst-supporting fiber structure.
- Example 7 shows the results of evaluating the catalytic activity of the obtained catalyst-supporting fiber structure.
- Example 6 The same operation was performed as in Example 6, except that porous silica-coated titanium oxide ("Maskmelon-type photocatalyst", particle size: 5 m, manufactured by Taihei Kagaku Sangyo Co., Ltd.) was used as the catalyst.
- porous silica-coated titanium oxide (“Maskmelon-type photocatalyst", particle size: 5 m, manufactured by Taihei Kagaku Sangyo Co., Ltd.) was used as the catalyst.
- the basis weight of the obtained fiber structure was 5 gZm 2 , the average fiber diameter was 0.15 ⁇ , fibers having a fiber length of 20 m or less were not observed, and the catalyst particle diameter was 5 m. . 0 shows a scanning electron micrograph of the fiber structure to the first 5 Figure, Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 6 The same operation as in Example 6 was carried out except that porous silica-coated titanium oxide ("Maskmelon-type photocatalyst", particle size 15 / zm, manufactured by Taihei Kagaku Sangyo KK) was used as the catalyst.
- porous silica-coated titanium oxide (“Maskmelon-type photocatalyst", particle size 15 / zm, manufactured by Taihei Kagaku Sangyo KK) was used as the catalyst.
- the basis weight of the obtained fiber structure was 5 gZm 2 , the average fiber diameter was 0.15 ⁇ , fibers having a fiber length of 20 ⁇ or less were not observed, and the catalyst particle diameter was 13 m. .
- Fig. 16 shows a scanning electron micrograph of the fibrous structure.
- Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 6 instead of the porous silica-coated titanium oxide as a catalyst, Apataito coated titanium oxide (Taihei Chemical Industrial Co., Ltd. "photocatalyst ⁇ Pas tight", particle size 5 ⁇ ⁇ ) The same procedure but using Was done.
- the basis weight of the obtained fiber structure was 5 g / m 2 , the average fiber diameter was 0.15 m, and fibers having a fiber length of 20 m or less were not observed.
- the catalyst particle size was 9 m.
- Table 1 shows the results of evaluating the catalytic activity of the obtained catalyst-supporting fiber structure.
- Example 6 The same operation as in Example 6, except that titanium oxide ("PC-101A", particle size: 40 nm, manufactured by Titanium Industry Co., Ltd., particle diameter: 40 nm) was used as the catalyst instead of the porous silicon-coated titanium oxide. was done.
- PC-101A particle size: 40 nm, manufactured by Titanium Industry Co., Ltd., particle diameter: 40 nm
- the distance to 5 was 15 cm.
- the basis weight of the obtained fiber structure was 7 gZm 2 .
- the average fiber diameter was 0.2 ⁇ m, and fibers having a fiber length of 20 zm or less were not observed.
- the catalyst particle size was 11 ⁇ .
- Example 12 A scanning electron micrograph of the fiber structure is shown in FIG. Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 12 A scanning electron micrograph of the fiber structure is shown in FIG. Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 11 the same operation was performed except that apatite-coated titanium oxide (“Photocatalytic Apatite”, manufactured by Taihei Chemical Industry Co., Ltd., particle size: 5 ⁇ ) was used as the catalyst instead of porous silica-coated titanium oxide. went.
- the basis weight of the obtained fiber structure was 7 gZm 2 , and the average fiber diameter was 0.2 ⁇ . However, fibers having a fiber length of 20 // m or less were not observed.
- the catalyst particle size was 10 ⁇ m.
- Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 11 was repeated except that titanium oxide ("PC-101A” manufactured by Titanium Industry Co., particle diameter 40 nm) was used as the catalyst instead of the porous silica-coated titanium oxide. .
- the basis weight of the obtained fiber structure was 7 gZm 2 , the average fiber diameter was 0.2 ⁇ , and fibers having a fiber length of 20 m or less were not observed.
- the catalyst particle size was 9 / zm.
- Fig. 21 shows a scanning electron micrograph of the fiber structure. Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure. Comparative Example 4
- Example 6 The same operation was performed as in Example 6, except that the porous silica-coated titanium oxide was not used.
- the basis weight of the obtained fiber structure was 5 gm 2 , the average fiber diameter was 0.15 ⁇ , and fibers having a fiber length of 20 ⁇ or less were not observed.
- a scanning electron micrograph of the fiber structure is shown in FIG. Table 1 shows the results of evaluating the catalytic activity of the obtained catalyst-supporting fiber structure. Comparative Example 5
- Example 11 The same operation was performed as in Example 11 except that the porous silica-coated titanium oxide was not used.
- the basis weight of the obtained fiber structure was 7 g / m 2 , the average fiber diameter was 0.2 ⁇ , and fibers having a fiber length of 20 ⁇ or less were not observed.
- FIG. 23 shows a scanning electron micrograph of the fibrous structure. Get Table 1 shows the catalytic activity evaluation results of the obtained catalyst-supporting fiber structure.
- Example 1 (Min) Absorbance Example 1 30 0.07 Example 2 30 0.06 Example 3 30 0.08 Example 4 30 0.42 Example 5 60 0.37 Example 6 60 0.19 Example 7 6 0 0.20 Example 8 60 0.47 Example 9 60 0.27 Example 1 0 60 0.83 Example 1 1 6 0 0.13 Example 1 2 6 0 0.38 Example 1 3 60 0.9 3
- Plank 30 1.06 Blank 6 0 1. 1 6 Uncatalyzed fiber structure 6 0 1.
Abstract
Description
Claims
Priority Applications (3)
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US10/552,682 US20060223696A1 (en) | 2003-04-11 | 2004-04-08 | Catalyst-supporting fiber structure and method for producing same |
EP04726660A EP1629890A4 (en) | 2003-04-11 | 2004-04-08 | CATALYST-CARRYING FIBER STRUCTURE AND MANUFACTURING METHOD THEREFOR |
JP2005505370A JPWO2004091785A1 (ja) | 2003-04-11 | 2004-04-08 | 触媒担持繊維構造体およびその製造方法 |
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JP2003-277335 | 2003-07-22 | ||
JP2003-306132 | 2003-08-29 | ||
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EP (1) | EP1629890A4 (ja) |
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WO2006001403A1 (ja) * | 2004-06-23 | 2006-01-05 | Teijin Limited | 無機系繊維、繊維構造体およびその製造方法 |
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WO2010052898A1 (ja) * | 2008-11-10 | 2010-05-14 | ポリプラスチックス株式会社 | 環状オレフィン系樹脂繊維、及び環状オレフィン系樹脂不織布 |
JP2010111978A (ja) * | 2008-11-10 | 2010-05-20 | Polyplastics Co | 環状オレフィン系樹脂繊維、及び環状オレフィン系樹脂不織布 |
JP2014226667A (ja) * | 2013-05-23 | 2014-12-08 | グニテック コーポレーション | 繊維触媒の製造方法及びその繊維触媒 |
JP2015163396A (ja) * | 2014-02-03 | 2015-09-10 | 国立大学法人信州大学 | 光触媒フィルターおよびその製造方法 |
WO2015137511A1 (en) * | 2014-03-11 | 2015-09-17 | Nitto Denko Corporation | Photocatalytic element |
CN106068161A (zh) * | 2014-03-11 | 2016-11-02 | 日东电工株式会社 | 光催化元件 |
JP2017509481A (ja) * | 2014-03-11 | 2017-04-06 | 日東電工株式会社 | 光触媒エレメント |
US10464055B2 (en) | 2014-03-11 | 2019-11-05 | Nitto Denko Corporation | Photocatalytic element |
CN106068161B (zh) * | 2014-03-11 | 2022-07-01 | 日东电工株式会社 | 光催化元件 |
JP2017160583A (ja) * | 2016-03-08 | 2017-09-14 | 日本ゼオン株式会社 | 繊維成形体の製造方法 |
JP2019505700A (ja) * | 2016-08-30 | 2019-02-28 | コリア ユニバーシティ リサーチ アンド ビジネス ファウンデーションKorea University Research And Business Foundation | ナノファイバ−ナノワイヤ複合体及びその製造方法 |
US10895023B2 (en) | 2016-08-30 | 2021-01-19 | Korea University Research And Business Foundation | Nanofiber-nanowire composite and preparation method therefor |
CN107815791A (zh) * | 2017-11-16 | 2018-03-20 | 东华大学 | 一种负载催化剂的复合纳米纤维无纺布的制备方法 |
Also Published As
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KR20050121719A (ko) | 2005-12-27 |
JP4742127B2 (ja) | 2011-08-10 |
US20060223696A1 (en) | 2006-10-05 |
JP4742126B2 (ja) | 2011-08-10 |
JP2009034677A (ja) | 2009-02-19 |
EP1629890A1 (en) | 2006-03-01 |
EP1629890A4 (en) | 2009-06-17 |
JPWO2004091785A1 (ja) | 2006-07-06 |
JP2009018307A (ja) | 2009-01-29 |
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