WO2022190901A1 - Matériau photocatalyseur - Google Patents

Matériau photocatalyseur Download PDF

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Publication number
WO2022190901A1
WO2022190901A1 PCT/JP2022/007900 JP2022007900W WO2022190901A1 WO 2022190901 A1 WO2022190901 A1 WO 2022190901A1 JP 2022007900 W JP2022007900 W JP 2022007900W WO 2022190901 A1 WO2022190901 A1 WO 2022190901A1
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Prior art keywords
photocatalyst
volatile compound
filter
volatile
zirconia
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PCT/JP2022/007900
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English (en)
Japanese (ja)
Inventor
悟司 上田
輝一 井原
慎也 小竹
里美 後藤
卓哉 福村
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日東電工株式会社
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Publication of WO2022190901A1 publication Critical patent/WO2022190901A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • 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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • 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
    • 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
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic

Definitions

  • the present invention relates to a photocatalyst material, a photocatalyst coating agent, a photocatalyst coating layer, a method for removing volatile compounds using the photocatalyst material, a photocatalyst filter, and a volatile compound removal device.
  • a volatile compound is a compound that has volatility and becomes gaseous in the atmosphere.
  • Volatile compounds include, for example, volatile organic compounds (VOCs) such as toluene and xylene, nitrogen oxides (NOx), and volatile inorganic compounds such as ammonia and perchloric acid.
  • VOCs volatile organic compounds
  • NOx nitrogen oxides
  • volatile inorganic compounds such as ammonia and perchloric acid.
  • Patent Document 1 discloses a photocatalyst coating liquid containing a photocatalyst, a polyacid compound and a dispersion medium.
  • an object of the present invention is to provide a photocatalyst material having sufficient volatile compound removal performance.
  • the present invention is as follows.
  • [3] The photocatalyst material according to [1] or [2], wherein ⁇ /( ⁇ + ⁇ ) is 0.1 to 0.9.
  • [4] The photocatalyst material according to any one of [1] to [3], wherein the proportion of the zirconia with respect to the total amount of the photocatalyst and the zirconia is 5 to 60% by mass.
  • [5] The photocatalyst material according to any one of [1] to [4], which is used for removing formaldehyde.
  • a photocatalytic coating agent comprising the photocatalytic material according to any one of [1] to [5], a binder and a solvent.
  • the photocatalyst filter according to [10] wherein the supported amount of the photocatalyst material is 0.01 to 0.1 g/cm 3 .
  • a volatile compound removal unit including the photocatalyst filter according to [10] or [11] and a light source for irradiating the photocatalyst filter with light; an inflow part for inflowing a volatile compound into the volatile compound removing part; a discharge unit for discharging a removed material obtained by removing the volatile compound by passing the volatile compound through the volatile compound removal unit; A volatile compound removal device.
  • a volatile compound removing unit including a photocatalyst filter and a light source for irradiating the photocatalyst filter; an inflow part for inflowing a volatile compound into the volatile compound removing part; a discharge unit for discharging a removed material obtained by removing the volatile compound by passing the volatile compound through the volatile compound removal unit;
  • a volatile compound removal device comprising: including two or more stages of the volatile compound removing unit, Of the two or more stages of volatile compound removal units, at least one stage of the volatile compound removal unit comprises the photocatalyst filter according to [10] or [11]. Volatile compound remover.
  • the volatile compound removal unit at the final stage through which the volatile compound finally passes includes the photocatalyst filter according to [10] or [11].
  • a photocatalyst material having sufficient volatile compound removal performance can be provided.
  • FIG. 1 is a spectrum obtained by XRD measurement of zirconia in Example 1.
  • FIG. 2 is a spectrum obtained by XRD measurement of zirconia in Example 2.
  • FIG. 3 is a spectrum obtained by XRD measurement of zirconia in Comparative Example 1.
  • FIG. 4 is a spectrum obtained by XRD measurement of zirconia in Comparative Example 2.
  • FIG. 5 is a spectrum obtained by XRD measurement of zirconia in Comparative Example 3.
  • FIG. 6 is a spectrum obtained by XRD measurement of zirconia in Comparative Example 4.
  • FIG. 7 is a spectrum obtained by XRD measurement of zirconia in Comparative Example 5.
  • FIG. FIG. 8 is a graph showing formaldehyde residual rates in Examples and Comparative Examples.
  • FIG. 9 shows a schematic diagram of a photocatalyst filter according to one embodiment of the present invention.
  • FIG. 10 shows a schematic cross-sectional view of the volatile compound removing device of one embodiment of the present invention when viewed from the front.
  • FIG. 11(a) is a schematic cross-sectional view of a fume hood according to an embodiment of the present invention as viewed from the front.
  • FIG. 11(b) is a schematic cross-sectional view of the fume hood of one embodiment of the present invention as viewed from the side.
  • FIG. 12 shows a production flow of a photocatalyst filter according to one embodiment of the present invention.
  • FIG. 13(a) shows a schematic diagram of a volatile compound removing device having two units in this embodiment.
  • FIG. 13(b) shows a schematic diagram of a three-stage volatile compound removing apparatus in this embodiment.
  • 14 is a graph showing the formaldehyde removal rates of Examples 5 to 11 and Comparative Example 6.
  • FIG. 15 is a graph showing the formaldehyde removal rates of Examples 12-14 and Comparative Example 7.
  • FIG. 16 is a graph showing the formaldehyde removal rate with respect to the amount of supported photocatalyst in Examples 5, 8 and 9.
  • FIG. 17 is a graph showing the amount of powder dropped after the sieving test with respect to the supported amount of photocatalyst.
  • FIG. 18 is a graph showing the concentration of formaldehyde after passing through four stages of photocatalyst filters in a fume hood.
  • FIG. 19(a) is a graph showing the formaldehyde gas removal durability of activated carbon for removing aldehyde.
  • FIG. 19(b) is a graph showing the formaldehyde gas removal sustainability of the photocatalyst filter of Example 3.
  • FIG. 20 is a diagram schematically showing a test method for ammonia removal performance.
  • 21 is a graph showing the ammonia removal rates of the photocatalyst materials of Example 3 and Comparative Example 1.
  • a to B indicating a range means “A or more and B or less”. Further, in this specification, "weight” and “mass”, as well as “weight %” and “wt %” and “mass %” are treated as synonyms.
  • a photocatalyst is a substance that exhibits photocatalytic activity when irradiated with light in a specific wavelength range (excitation light with energy equal to or greater than the bandgap between the valence band and conduction band of the photocatalyst).
  • an ultraviolet-light-responsive photocatalyst that exhibits photocatalytic activity upon irradiation with ultraviolet rays
  • a visible-light-responsive photocatalyst that exhibits photocatalytic activity upon irradiation with visible light
  • the photocatalyst in the present embodiment exhibits volatile compound removal performance by exhibiting the photocatalytic activity.
  • the volatile compound removal performance means both the volatile compound adsorption performance and the volatile compound decomposition performance.
  • volatile compounds are a general term for compounds that volatilize in the atmosphere to become gas, and include volatile organic compounds (VOC) and volatile inorganic compounds.
  • VOCs include acetaldehyde, toluene, benzene, xylene, ethyl acetate, formaldehyde, ethylene oxide and the like.
  • volatile inorganic compounds include ammonia and hydrogen sulfide. Among them, VOCs, particularly formaldehyde, are exemplified as volatile compounds that are highly removed by the photocatalyst material of the present embodiment.
  • the photocatalyst used in the photocatalyst material of the present embodiment is not particularly limited, and examples thereof include titanium oxide (TiO 2 ), tungsten oxide (III) (W 2 O 3 ), tungsten oxide (IV) (WO 2 ), and tungsten oxide.
  • VI (WO3), zinc oxide (ZnO), iron ( III ) oxide ( Fe2O3 ) , strontium titanate (SrTiO3) , bismuth ( III ) oxide (Bi2O3), bismuth vanadate ( BiVO 4 ), tin (II) oxide (SnO), tin (IV) oxide (SnO 2 ), tin (VI) oxide (SnO 3 ), cerium (II) oxide (CeO), cerium (IV) oxide (CeO 2 ), barium titanate (BaTiO 3 ), indium (III) oxide (In 2 O 3 ), copper (I) oxide (Cu 2 O), copper (II) oxide (CuO), potassium tantalate (KTaO 3 ), metal oxides such as potassium niobate (KNbO3); metal sulfides such as cadmium sulfide (CdS), zinc sulfide (ZnS), indium sulfide (InS
  • the photocatalyst is preferably titanium oxide, tungsten oxide, etc., and more preferably titanium oxide.
  • titanium oxide In the removal of volatile compounds that produce decomposition intermediates, the use of titanium oxide as a photocatalyst facilitates complete decomposition without generating decomposition intermediates.
  • a photocatalyst containing titanium oxide includes not only cases in which the photocatalyst is pure titanium oxide, but also cases in which titanium oxide is doped with other elements or compounds (titanium oxide The same applies to other photocatalysts and co-catalysts).
  • the photocatalysts exemplified above can be obtained, for example, by solid-phase reaction methods, combustion synthesis methods, solvothermal synthesis methods, thermal decomposition methods, plasma synthesis methods, and the like.
  • the photocatalyst is obtained by radio frequency inductively coupled plasma (RF-ICP).
  • RF-ICP radio frequency inductively coupled plasma
  • the RF-ICP method has high production efficiency and can obtain a photocatalyst with high purity.
  • a photocatalyst can be obtained, for example, by RF-ICP conditions described in US Pat. No. 8,003,563.
  • alkali metals such as lithium (Li), sodium (Na), potassium (K), cesium (Cs); magnesium (Mg), calcium (Ca ), strontium (Sr), alkaline earth metals such as barium (Ba); precious metals such as gold (Au), platinum (Pt), rhodium (Rh), iridium (Ir), palladium (Pd), ruthenium (Ru) iron (Fe), titanium (Ti), zinc (Zn), copper (Cu), tungsten (W), manganese (Mn), niobium (Nb), nickel (Ni), zirconium (Zr), cerium (Ce) transition metals such as; tin (Sn), other metals such as aluminum (Al), semimetals such as boron (B) and arsenic (As); nitrogen (N), carbon (C), sulfur (
  • alkali metals such as lithium (Li), sodium (Na), potassium (K), cesium (Cs); magnesium (Mg), calcium (
  • Doping means adding an arbitrary element (dopant) into the host compound crystal within a range in which the basic crystal structure of the photocatalyst is hardly changed. Whether or not the photocatalyst is doped can be confirmed, for example, by a peak shift in XPS (X-ray photoelectron spectroscopy).
  • a method for forming the doping type photocatalyst is not particularly limited, and a sol-gel method, a solid phase reaction method, an ion implantation method, or the like is used.
  • the molar ratio of the host compound (the compound to be doped) and the dopant in the photocatalyst is not particularly limited, but is preferably 99.9:0.1 to 80:20, More preferably 99.9:0.1 to 85:15, still more preferably 99.9:0.1 to 87:13.
  • Doping photocatalysts include carbon (C), nitrogen (N), sulfur (S), fluorine (F), tin (Sn), zinc (Zn), manganese (Mn), aluminum (Al), selenium (Se), It is preferably doped with at least one selected from niobium (Nb), nickel (Ni), zirconium (Zr), cerium (Ce), and iron (Fe).
  • the photocatalyst may be p-type or n-type.
  • a p-type photocatalyst can be obtained, for example, by doping an element with a high valence (such as arsenic (As)) into the ultraviolet light-responsive photocatalyst.
  • An n-type photocatalyst can be obtained, for example, by doping an element with a low valence (eg, boron (B)) into the ultraviolet light-responsive photocatalyst.
  • the photocatalyst preferably has a refractive index (R1) of 1.0 to 4.0 at a wavelength of 589 nm, more preferably 1.0 to 3.0, and particularly preferably 1.5 to 2.5. is. If the refractive index (R1) of the photocatalyst is within the range of 1.0 to 4.0, it becomes easier to reduce the difference in refractive index from the co-catalyst, making it easier to form a photocatalyst layer with excellent translucency.
  • the refractive index of the photocatalyst is a value measured using an Abbe refractometer in accordance with JIS K 0062 "Measurement method for solid samples".
  • the shape of the photocatalyst is not particularly limited, it is preferably particulate. Since many photocatalysts are poorly soluble in solvents, by making the photocatalyst into particles, it is possible to disperse the photocatalyst in the dispersion medium and prepare a dispersion liquid. A coating layer can be formed.
  • the average particle size of the photocatalyst is not particularly limited, but is preferably 5 nm to 1000 nm, more preferably 5 nm to 100 nm, still more preferably 5 nm to 30 nm. If the average particle size of the photocatalyst exceeds 1000 nm, the surface area of the entire photocatalyst becomes small, and the photocatalyst may not exhibit sufficient photocatalytic activity. On the other hand, if the average particle size of the photocatalyst is less than 5 nm, the particles may tend to aggregate, resulting in a decrease in dispersibility.
  • the average particle size of the photocatalyst is the volume-based 50% cumulative distribution diameter obtained by the dynamic light scattering method and frequency analysis (FFT-heterodyne method) of the photocatalyst particles in a state in which the photocatalyst is dispersed in an arbitrary dispersion liquid. (D50).
  • the content of the photocatalyst in the photocatalyst material of the present embodiment is preferably 40% by mass or more, more preferably 60% by mass or more, and is preferably 95% by mass or less, more preferably 80% by mass or less.
  • the volatile compound decomposition performance of the photocatalyst is not hindered, and sufficient volatile compound removal performance can be exhibited.
  • the ratio of the photocatalyst to the total amount of the photocatalyst and zirconia described later is preferably 40% by mass or more, more preferably 60% by mass or more, and is preferably 95% by mass or less, and more preferably 80% by mass or less. By being within the above range, sufficient volatile compound removal performance can be exhibited.
  • the crystalline peak is a diffraction line that appears as a peak when a periodic structure such as crystalline exists, and there is no peak in amorphous because it appears as a halo.
  • ⁇ /( ⁇ + ⁇ ) in the zirconia is 0.1 or more means that the zirconia has a cubic and/or tetragonal crystal structure. Also, as ⁇ /( ⁇ + ⁇ ) approaches 1, it means that zirconia preferentially has a cubic and/or tetragonal crystal structure over a monoclinic crystal structure.
  • the crystalline peak of zirconia in this embodiment can be measured by the method described in Examples.
  • the zirconia in the present embodiment preferably has ⁇ /( ⁇ + ⁇ ) of 0.1 to 0.9. Within the above range, it is believed that the content of zirconia having a cubic and/or tetragonal crystal structure is higher, and the volatile compound removing performance of the photocatalyst material is further improved.
  • the above ⁇ /( ⁇ + ⁇ ) is more preferably 0.15 to 0.9, still more preferably 0.2 to 0.9.
  • zirconia in this embodiment is not particularly limited, it is preferably particulate.
  • zirconia can be dispersed in a dispersion medium to prepare a dispersion, and a photocatalyst coating layer can be easily formed by applying and drying this dispersion.
  • the average particle size of the zirconia is not particularly limited, but is preferably 5 nm to 1000 nm, more preferably 5 nm to 100 nm, still more preferably 5 nm to 50 nm.
  • the average particle size of the zirconia exceeds 1000 nm, the surface area of the entire zirconia becomes small, which may deteriorate the volatile compound removing performance.
  • the average particle size of the zirconia is less than 5 nm, the particles may easily aggregate, and the dispersibility may deteriorate.
  • the average particle size of zirconia in the present embodiment is a volume-based volume obtained by a dynamic light scattering method and frequency analysis (FFT-heterodyne method) of zirconia particles in a state in which the zirconia is dispersed in an arbitrary dispersion liquid.
  • the specific surface area of zirconia in this embodiment is not particularly limited, it is, for example, 10 to 1000 m 2 /g, preferably 50 to 1000 m 2 /g, more preferably 100 to 1000 m 2 /g.
  • the specific surface area of zirconia in this embodiment is measured by the BET method.
  • the content of zirconia in the photocatalyst material of the present embodiment is preferably 5% by mass or more, more preferably 10% by mass or more, and is preferably 95% by mass or less, more preferably 90% by mass or less.
  • zirconia can exhibit sufficient volatile compound removal performance without inhibiting the decomposition performance of the photocatalyst.
  • the ratio of the zirconia to the total amount of the photocatalyst and the zirconia is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 20% by mass or more, and preferably 60% by mass or less, and 50% by mass or less. is more preferable, and 40% by mass or less is even more preferable. When the ratio of the zirconia is within the above range, sufficient volatile compound removal performance can be exhibited.
  • the photocatalyst material in this embodiment may contain a co-catalyst as another component.
  • a promoter is a substance that promotes the photocatalytic activity of a photocatalyst.
  • the co-catalyst may show photocatalytic activity by itself, or may not show photocatalytic activity by itself.
  • a co-catalyst is a substance that, in cooperation with a photocatalyst, can improve the reaction rate of the photocatalyst as compared with the case where the photocatalyst alone is used.
  • Promoters are, for example, copper (I) oxide (Cu 2 O), copper (II) oxide (CuO), yttrium (III) oxide (Y 2 O 3 ), molybdenum (VI) oxide (MoO 3 ), manganese oxide (III) (Mn 2 O 3 ), gadolinium (III) oxide (Gd 2 O 3 ), anatase-type or rutile-type titanium oxide (TiO 2 ), strontium titanate (SrTiO 3 ), potassium tantalate (KTaO 3 ) , silicon carbide (SiC), potassium niobate (KNbO 3 ), silicon oxide (SiO 2 ), tin (IV) oxide (SnO 2 ), aluminum (III) oxide (Al 2 O 3 ), iron (III) oxide ( Fe 2 O 3 ), iron (II, III) oxides (Fe 3 O 4 ), nickel (II) oxide (NiO), niobium (V) oxide (Nb 2 O 5
  • the photocatalyst material of the present embodiment may be used in a powdered form, or the powdered catalyst may be molded into an appropriate shape such as granules, pellets, or honeycombs. Moreover, you may use in the form which formed the photocatalyst layer which consists of the photocatalyst material of this embodiment on the base-material surface which consists of suitable materials, such as resin, glass, a ceramic, and a metal.
  • the powdery photocatalyst material in the present embodiment is preferably in the form of powder (mixed powder) in which photocatalyst particles and zirconia particles are mixed.
  • a method for producing a photocatalyst material in the present embodiment includes a step of mixing a photocatalyst and the zirconia.
  • a photocatalyst and the zirconia In addition to the photocatalyst and zirconia, other components may be added and mixed as necessary.
  • the mixing method is not particularly limited, and general physical mixing methods such as a mortar, ball mill, and mixer may be used.
  • solvents such as water, ethanol, methanol, propanol, butanol, acetic acid, dimethylformamide, acetonitrile, and acetone can be used, and the photocatalyst material can be obtained as a dispersion or solution.
  • a dispersant can be used for dispersion and mixing. Alternatively, ultrasonic dispersion may be used.
  • a cross-linking agent, a filler and the like can be blended in the preparation of the photocatalyst material.
  • the photocatalyst coating agent of this embodiment contains the photocatalyst material, a binder, and a solvent.
  • photocatalytic material also applies to the photocatalytic material contained in the photocatalytic coating agent of this embodiment.
  • the content of the photocatalytic material in the photocatalytic coating agent of the present embodiment is usually 40-95% by mass, preferably 50-90% by mass, more preferably 55-85% by mass.
  • the binder is not particularly limited, and may be an inorganic binder or an organic binder.
  • the inorganic binder is not particularly limited, but preferably has a property of transmitting ultraviolet light or visible light.
  • examples include silicate binders, phosphate binders, inorganic colloid binders, alumina, silica, and zirconia. and the like, and these can be used alone or in combination of two or more.
  • organic binder A commercially available binder can be used as the organic binder.
  • organic binders include acrylic resins, ethyl cellulose, polyvinyl butyral, methacrylic resins, urethane resins, butyl methacrylate, and vinyl copolymers. These can be used individually or in combination of 2 or more types.
  • the content of the binder in the photocatalyst coating agent of the present embodiment is usually 0-70% by mass, preferably 2-20% by mass.
  • the solvent is not particularly limited, and known solvents such as water, methanol, ethanol, propanol, butanol, acetic acid, dimethylformamide, acetonitrile, and acetone can be used.
  • the content of the solvent in the photocatalyst coating agent of the present embodiment is usually 70-95% by mass, preferably 80-90% by mass.
  • the photocatalyst coating agent may contain a dispersant.
  • dispersants include, but are not limited to, hydrocarbons such as toluene, xylene, benzene, hexane, and cyclohexane, ethers such as cellosolve, carbitol, tetrahydrofuran (THF), and dioxolane, acetone, methyl ethyl ketone, and methyl isobutyl ketone. , ketones such as cyclohexanone, and esters such as methyl acetate, ethyl acetate, n-butyl acetate and amyl acetate. These can be used individually or in combination of 2 or more types.
  • the content of the dispersant in the photocatalyst coating agent of the present embodiment is usually 0-10% by mass, preferably 1-5% by mass.
  • the photocatalyst coating layer of this embodiment contains the photocatalyst material and a binder.
  • photocatalytic material also applies to the photocatalytic material contained in the photocatalytic coating layer of this embodiment.
  • the description of the photocatalyst coating material also applies to the binder contained in the photocatalyst coating layer of the present embodiment.
  • the photocatalyst coating layer can be formed by applying the above photocatalyst coating agent onto the substrate and drying the coating layer.
  • coating methods include printing, brush coating, spray coating, spin coating, roll coating, and curtain coating.
  • the thickness of the photocatalyst coating layer is, for example, 0.1 to 100 ⁇ m.
  • the base material examples include inorganic materials such as ceramics and glass, organic materials such as plastics, rubber, wood, and paper, metals such as aluminum, and metal materials such as alloys. Selectively used for In applying the photocatalyst material to the substrate, an intermediate layer may be provided.
  • Photocatalyst filter In the photocatalytic filter of this embodiment, as shown in FIG. 9, the photocatalytic material is supported on a filter base material.
  • the photocatalyst material used in the photocatalyst filter of the present embodiment the above description of the photocatalyst material embodiment applies as it is.
  • the type of filter base material is not particularly limited, and may be composed of, for example, a ceramic material such as a sintered body such as SiC or alumina, a metal, a resin, or a mixture thereof.
  • the filter base material may have a plurality of channels (cells) penetrating in a direction perpendicular to the surface in a honeycomb shape, as shown in FIG. 9, for example.
  • the cross-sectional shape of the cell in the surface direction of each channel through which the volatile compound flows is not particularly limited, and examples thereof include polygonal shapes such as squares and hexagons, circular shapes, and elliptical shapes.
  • a photocatalytic filter is obtained by supporting a photocatalytic material on a filter base material.
  • the method for supporting the photocatalyst material on the filter base material is not particularly limited, and conventionally known methods can be applied.
  • a photocatalyst filter may be obtained by coating and drying.
  • the amount of photocatalyst material supported on the filter substrate is preferably within the range of 0.01 to 0.1 g/cm 3 .
  • the lower limit of the supported amount is more preferably 0.03 g/cm 3 or more, more preferably 0.05 g/cm 3 or more.
  • the upper limit of the supported amount is more preferably 0.085 g/cm 3 or less, more preferably 0.075 g/cm 3 or less.
  • the supported amount of the photocatalyst material is 0.01 g/cm 3 or more, the volatile compound removal rate increases. Further, when the supported amount of the photocatalyst material is 0.1 g/cm 3 or less, the photocatalyst material is less likely to drop from the photocatalyst filter.
  • the supported amount of the photocatalyst material refers to the weight of the photocatalyst material per apparent volume of the filter base material, and can be measured, for example, from the change in weight of the filter base material before and after the photocatalyst material is supported.
  • the lower limit of the cell density of the photocatalyst filter is preferably 50 cells/inch 2 or more, more preferably 100 cells/inch 2 or more, and still more preferably 200 cells/inch 2 or more.
  • the lower limit of the cell density is 50 cells/inch 2 or more, the probability that volatile compounds passing through the photocatalyst filter come into contact with the photocatalyst material is increased, and the removal rate of volatile compounds is improved.
  • the upper limit of the cell density is preferably 700 cells/inch 2 or less, more preferably 600 cells/inch 2 or less, and still more preferably 500 cells/inch 2 or less.
  • the upper limit of the density of the cells is 700 cells/inch 2 or less, the light irradiating the photocatalyst material easily reaches the inside of the cells, the photocatalyst is more activated, and the removal performance of volatile compounds is improved.
  • the thickness of the photocatalyst filter is preferably in the range of 0.4 cm to 1.6 cm. Moreover, the lower limit of the thickness of the photocatalyst filter is more preferably 0.5 cm or more, still more preferably 0.6 cm or more, and particularly preferably 0.7 cm or more. When the lower limit of the thickness of the photocatalytic filter is 0.4 cm or more, the light emitted from the light source during the photocatalytic reaction is reflected and absorbed within the filter, facilitating the activation of the photocatalytic material.
  • the upper limit of the thickness of the photocatalyst filter is more preferably 1.5 cm or less, still more preferably 1.4 cm or less, and particularly preferably 1.3 cm or less.
  • the cell density of the photocatalyst filter can be measured, for example, by measuring the number of cells per unit area.
  • the external shape of the photocatalyst filter can be appropriately selected according to the application and is not particularly limited, but examples thereof include a rectangular shape and a circular shape.
  • FIG. 10 shows an example of the volatile compound removing device 10 of this embodiment.
  • the volatile compound removing device 10 includes a volatile compound removing unit 14 including the photocatalyst filter 13 and the light source 12 of the above embodiment, an inflow unit 11 for allowing the volatile compound to flow into the volatile compound removing unit, and a and a discharge unit 15 for discharging the removed material from which the volatile compound has been removed by passing through the volatile compound removal unit.
  • the volatile compound removing device of the present embodiment includes a volatile compound removing unit including a photocatalyst filter and a light source for irradiating the photocatalyst filter with light, an inflow unit for causing the volatile compound to flow into the volatile compound removing unit, and a volatile and a discharge unit for discharging the removed matter obtained by removing the volatile compound by passing the compound through the volatile compound removal unit, including two or more stages of the volatile compound removal unit, and two or more stages of volatile compounds At least one stage of the volatile compound removing section among the removing sections may include the photocatalyst filter of the above embodiment.
  • volatile compounds flow into the volatile compound removing section 14 through the inflow section 11 and are removed by the volatile compound removing section 14 .
  • the removed material from which the volatile compounds have been removed is discharged through the discharge section 15 .
  • the term "removed material” refers to a substance after the volatile compound has been processed by the volatile compound removing unit 14, and examples thereof include CO2 and H2O .
  • the inflow part 11 has a function of causing the volatile compound to flow into the volatile compound removal part 14 .
  • volatile compounds generated inside and outside the volatile compound removing device 10 are allowed to flow into the volatile compound removing unit 14 .
  • the volatile compounds may flow into the volatile compound removal unit 14 together with the air.
  • the inflow of the volatile compound into the volatile compound removing unit 14 can be promoted.
  • the device 10 in order to introduce air into the volatile compound removing device 10, the device 10 may be provided with an air inlet for taking air from the outside of the device into the inside of the device, as described later.
  • the volatile compound removal unit 14 includes the photocatalyst filter 13 of the present embodiment and the light source 12 that irradiates the photocatalyst filter 13 with light, and has a function of removing the volatile compounds introduced from the inflow unit 11 .
  • By “removal” is meant both adsorption of volatile compounds and decomposition of volatile compounds.
  • the volatile compound removing unit 14 includes at least the photocatalyst filter 13 of this embodiment, but may include a photocatalyst filter other than the photocatalyst filter 13 of this embodiment.
  • a filter substrate having a conventionally known photocatalyst material carried thereon may be used.
  • it may include a photocatalytic filter in which a photocatalytic material such as titanium oxide that does not contain zirconia is supported on the filter base material.
  • the light source 12 is composed of, for example, a light emitting diode (LED), an organic EL (electroluminescence), or the like, and emits light having a predetermined wavelength to irradiate the photocatalyst filter 13 .
  • This irradiation light activates the photocatalyst material carried on the photocatalyst filter 13 to remove the volatile compounds that have flowed in.
  • the type of light source and the wavelength of the irradiation light are not particularly limited.
  • the relative positional relationship between the light source 12 and the photocatalytic filter 13, for example, the distance between the light source 12 and the photocatalytic filter 13, the angle of the photocatalytic filter 13 arranged with respect to the light source 12, and the like are not particularly limited.
  • 12 and photocatalyst filters 13 are appropriately set according to the type, size, number, and the like.
  • substantially vertical includes the aspect of tilting within ⁇ 10° from the vertical direction.
  • the arrangement of the volatile compound removing section 14 in the volatile compound removing apparatus 10 is such that the volatile compounds that flow in from the inflow section 11 pass through the volatile compound removing section 14 and the removed substances can be discharged from the discharging section 15.
  • the photocatalyst filter surface of the volatile compound removing section 14 may be arranged parallel or substantially parallel to the bottom of the device.
  • substantially parallel includes a mode in which the direction is inclined within ⁇ 10° from the parallel direction.
  • they can be arranged arbitrarily, such as in a substantially vertical orientation or an oblique orientation with respect to the bottom of the device.
  • the number of stages of the volatile compound removing section 14 may be one, or may be two or more.
  • stage means one unit of the volatile compound removing section 14 in the flow direction of the volatile compounds.
  • the volatile compound removing section preferably has two or more stages, more preferably three or more stages, because the volatile compound removing performance of the apparatus as a whole improves as the number of stages increases.
  • the number of stages is usually 5 or less, preferably 4 or less.
  • the volatile compound removing sections 14 may be arranged in parallel or substantially parallel, or may not be arranged in parallel or substantially parallel. Further, the volatile compound removing units 14 may be arranged so that the flow direction of the volatile compound is from the bottom to the top of the device or from the top to the bottom of the device, or from the left side of the device. The volatile compound removing units 14 may be arranged in the right direction or in the direction from the right to the left of the apparatus, or the volatile compound removing units may be arranged in a flow direction other than the above. 14 may be arranged.
  • the volatile compound removing device 10 of the present embodiment includes two or more stages of volatile compound removing sections 14, at least one stage of the volatile compound removing section 14 is the photocatalyst of the present embodiment from the viewpoint of volatile compound removing performance. It is preferable that the filter 13 is included, and it is more preferable that the volatile compound removing units 14 of all stages include the photocatalyst filter 13 of the present embodiment.
  • the volatile compound removing device 10 of the present embodiment includes two or more stages of volatile compound removing units 14, at least the volatile compound removing unit 14 at the final stage through which the volatile compound finally passes is of the photocatalyst filter 13 is preferably included.
  • the photocatalyst filter 13 of the present embodiment is arranged at the final stage through which the volatile compounds pass last, thereby efficiently removing the volatile compounds. can. This is because the photocatalyst material of the present embodiment exhibits high removal performance even when the concentration of volatile compounds is low.
  • At least one photocatalyst filter among the plurality of photocatalysts arranged in one stage is used from the viewpoint of volatile compound removal performance. It is preferably the photocatalyst filter of the present embodiment, and more preferably all the photocatalyst filters arranged in one stage are the photocatalyst filters of the present embodiment.
  • the volatile compound removal device of the present embodiment has been described on the assumption that it includes the photocatalyst filter of the present embodiment, but another embodiment of the present invention is the photocatalyst filter of the present embodiment. It may be a mode that does not include. i.e. a volatile compound removal unit including a photocatalyst filter and a light source for irradiating the photocatalyst filter; an inflow part for inflowing a volatile compound into the volatile compound removing part; a discharge unit for discharging a removed material obtained by removing the volatile compound by passing the volatile compound through the volatile compound removal unit; and a volatile compound removal device.
  • a volatile compound removal unit including a photocatalyst filter and a light source for irradiating the photocatalyst filter
  • an inflow part for inflowing a volatile compound into the volatile compound removing part
  • a discharge unit for discharging a removed material obtained by removing the volatile compound by passing the volatile compound through the volatile compound removal unit
  • a filter base material supporting a conventionally known photocatalyst material may be used.
  • it may include a photocatalytic filter in which a photocatalytic material such as titanium oxide that does not contain zirconia is supported on the filter base material.
  • the discharge unit 15 has a function of discharging the removed matter obtained by removing the volatile compounds by passing the volatile compounds through the volatile compound removal unit 14 .
  • a removed substance means a substance after the volatile compound has been processed by the volatile compound removing unit 14 .
  • formaldehyde is processed by the volatile compound removing unit 14, CO 2 , H 2 O, and the like are discharged as removed substances.
  • the volatile compound removing device 10 is provided with an air inlet, which will be described later, etc., the removed matter may contain air.
  • Volatile compound removal device 10 may include an air intake for drawing air into the device from outside the device. By providing the air inlet, the inflow of the volatile compound to the volatile compound removing section can be promoted.
  • the volatile compound removing device 10 may include means for facilitating the flow of volatile compounds from the inflow portion 11 through the volatile compound removing portion 14 to the discharge portion 15 .
  • the means may include, for example, a blower fan that blows air in the direction from the inflow part 11 to the discharge part 15, or means for applying negative pressure along the direction from the inflow part 11 to the discharge part 15. .
  • the volatile compound removal device of the present embodiment can satisfactorily reduce volatile compounds, for example, fume hoods such as circulating push-bull ventilators, air cleaners, chemical storages, and ductless fume hoods It is preferably used as.
  • fume hoods such as circulating push-bull ventilators, air cleaners, chemical storages, and ductless fume hoods It is preferably used as.
  • the volatile compound removing apparatus of this embodiment will be further described below using a fume hood as an example.
  • a fume hood generally means a local exhaust ventilation system that protects workers conducting chemical experiments from harmful atmospheres.
  • Schematic cross-sectional views of the fume hood are shown in FIGS. 11(a) and 11(b).
  • FIG. 11(a) is a schematic cross-sectional view of the fume hood when viewed from the front
  • FIG. 11(b) is a schematic cross-sectional view of the fume hood when viewed from the side.
  • the fume hood 30 allows the volatile compounds generated in the working section 17 to flow into the volatile compound removing section 14 through the inflow section 11, and the volatile compounds Volatile compounds are removed by the compound removal unit 14 and the removed substances are discharged from the discharge unit 15 .
  • the work section 17 is a space for workers to perform work such as chemical experiments.
  • the working section 17 may have a space isolated from the outside in order to prevent volatile compounds generated by the work from diffusing to the outside of the apparatus.
  • the working part 17 may be provided with a finger insertion part 16 for inserting a finger and performing operations related to chemical experiments or the like.
  • a finger insertion part 16 for inserting a finger and performing operations related to chemical experiments or the like.
  • an opening into which a finger can be inserted, an elevating sliding door, and the like can be used.
  • the finger insertion portion may also serve as the suction port described above.
  • the volatile compounds generated in the working section 17 are introduced into the volatile compound removing section 14 by the inflow section 11 .
  • the volatile compounds flow into the volatile compound removing unit 14 together with the air taken in from the intake port.
  • a method of flowing into the volatile compound removing unit 14 together with air for example, there is a method using a blower fan or a method of applying a negative pressure along the direction from the inflow unit 11 to the discharge unit 15 .
  • a blower fan or a method of applying a negative pressure along the direction from the inflow unit 11 to the discharge unit 15 .
  • the volatile compounds introduced into the volatile compound removing unit 14 are removed by the volatile compound removing unit 14 as described above, and the removed substances from which the volatile compounds have been removed are discharged to the outside through the discharging unit 15. be.
  • the fume hood may include a HEPA (High Efficiency Particular Air Filter) filter 18 and a backup filter 20 as shown in FIG. 11(b). By providing such a filter, dust and the like that have flowed into the fume hood 30 can be removed. Further, the fume hood 30 may be provided with a blower fan 19 as shown in FIG.
  • the fume hood 30 can release the volatile compounds generated in the working section 17 to the outside through the volatile compound removing section 14 without leaking them to the outside.
  • Titanium oxide manufactured by Evonik, P25
  • various types of zirconia were mixed at the weight ratios shown in Table 1, and physically dispersed using a mortar at a speed of about 60 rpm for 15 minutes or more to prepare a photocatalyst material powder.
  • 20 mg of the photocatalyst material powder was weighed into a screw tube with a capacity of 6 mL, and 1.5 mL of ion-exchanged water was added. This was ultrasonically dispersed for 30 minutes using an ultrasonic cleaner (manufactured by SND, US-2KS) to prepare a dispersion of photocatalyst material.
  • an ultrasonic cleaner manufactured by SND, US-2KS
  • Example 1 Trade name JRC ZRO 7, manufactured by Daiichi Kigenso Kagaku Kogyo Co., Ltd.
  • Examples 2 to 4 Trade name ZrO 2 , manufactured by Kanto Denka Kogyo Co., Ltd.
  • Comparative Example 1 Trade name ZrO 2 , Fujifilm Wako Jun Yakusha
  • Comparative Example 2 Trade name RC100, Daiichi Kigenso Kagaku Kogyo Co., Ltd.
  • ⁇ Comparative Example 3 Trade name UEP100, Daiichi Kigenso Kagaku Kogyo Co., Ltd.
  • Table 1 shows the results of the peak intensity ratio ⁇ /( ⁇ + ⁇ ) and ⁇ /( ⁇ + ⁇ ) of zirconia used in Examples and Comparative Examples. Also, the spectra obtained by XRD measurement of zirconia in Examples 1 and 2 and Comparative Examples 1 to 5 are shown in FIGS. 1 to 7, respectively.
  • formaldehyde gas concentration was quantified using gas chromatography (Shimadzu Corporation GC-2010), and the formaldehyde residual rate was calculated according to the following formula. Each condition is as follows.
  • Table 1 and Fig. 2 show the measurement results of the formaldehyde residual rate in Examples and Comparative Examples.
  • the photocatalyst materials of the examples using zirconia with ⁇ /( ⁇ + ⁇ ) of 0.1 to 1 have HCHO residual compared to the comparative examples using zirconia with ⁇ /( ⁇ + ⁇ ) outside the above range.
  • a lower rate indicates a higher HCHO removal performance.
  • FIG. 12 shows the production flow of the photocatalyst filter. Titanium oxide (manufactured by Evonik, P25) and zirconia (Examples 5 to 14: ZrO 2 manufactured by Kanto Denka Kogyo Co., Ltd.; Comparative Example 6: UEP100 manufactured by Daiichi Kigenso Kagaku Kogyo Co., Ltd.) are shown in Tables 3 and 4, respectively. Physically mixed in proportions.
  • a deep agate mortar with an inner diameter of 10 cm was used for physical mixing, and TiO 2 and ZrO 2 were thoroughly mixed by stirring with a pestle for about 10 minutes to prepare a photocatalyst material powder.
  • the photocatalyst material powder is the same as the photocatalyst material powder of Example 3 described above, and the photocatalyst material powder used in the upper and lower stages of Comparative Example 6 is the same as the photocatalyst material powder of Comparative Example 3 described above.
  • a straight filter manufactured by Nippon Crucible Co., Ltd., cell density: 300, 400, 500 cells/inch 2 )
  • a photocatalyst filter was obtained by repeating dip coating and drying treatment 1 to 4 times until the amount of photocatalyst material supported on the straight filter reached the amount shown in Tables 3 and 4.
  • a total of four photocatalyst filters prepared above are arranged in two rows in the horizontal direction and two rows in the depth direction, and the four photocatalyst filters are irradiated with UV light having a wavelength of about 365 nm and an intensity of about 7 mW/cm 2 on the upper surface of each photocatalyst filter. Equipped with LEDs.
  • FIGS. 13(a) and 13(b) 2 or 3 units of volatile compound removing apparatus were assembled in a layered manner using this as one unit.
  • ⁇ Formaldehyde gas removal test> The method of generating the test gas is shown below.
  • 150 mL of formalin (Fuji Film Wako Pure Chemical Co., Ltd., formaldehyde content: 37%, methanol content: 5-10%) was placed in a bubbler and kept at 25°C in a water bath.
  • Nitrogen gas was blown into the bubbler at a rate of 0.05 L/min when the number of units was two, and at a rate of 0.2 L/min when the number of units was three.
  • Examples 5 to 11 exhibited a higher formaldehyde removal rate than Comparative Example 6. Further, as shown in Table 4 and FIG. 15, Examples 12-14 showed higher formaldehyde removal performance than Comparative Example 7.
  • FIG. 16 shows the results of plotting the removal rate of formaldehyde gas after passing through the upper and lower stages against the amount of photocatalyst supported in Examples 5, 8, and 9 in which the cell density and photocatalyst material were the same.
  • a filter (length 5 cm x width 5 cm x thickness 0.8 cm) supporting the photocatalyst material of Example 3 is placed in a sieve with an opening of 4 mm (diameter 75 mm), and the sieve is shaken by a sieve (AS ONE, MVS-1N). was installed in The sieve shaker was horizontally rotated at a rotation speed of 1000 rpm (16.7 Hz) for 120 minutes, and after the rotation was completed, the weight of the catalyst (amount of falling powder (mg)) deposited on the tray was measured. The results are shown in Table 5 and FIG.
  • the photocatalyst filter of the present invention preferably has a supported amount of photocatalyst material in the range of 0.01 to 0.1 g/cm 3 .
  • each photocatalyst filter was irradiated with ultraviolet light under the above conditions. Then, three petri dishes with a diameter of 10 cm filled with formalin (Fujifilm Wako Pure Chemical, formaldehyde content: 37%, methanol content: 5-10%) are placed in the center of the workbench, which is the working section of the fume hood. formaldehyde and methanol to form a formalin vaporized gas. The generated formalin volatilization gas was passed through the fume hood at a surface velocity of 0.1 m/s.
  • the concentration of formaldehyde before entering the photocatalyst filter unit (0 stages) and after passing through the 1st, 2nd, 3rd, and 4th stages of the filter units (stages) was measured using a gas detector tube (Gastech Co., Ltd.: 91L, 91TP). Further, the gas after passing through the fourth stage of the filter unit was analyzed by high performance liquid chromatography (HPLC) to measure the formaldehyde concentration more accurately.
  • HPLC high performance liquid chromatography
  • a volatile compound removal device was assembled in the same manner as in [Evaluation of removal performance of fume hood] except that the irradiation intensity of UV light was set to about 7 mW/cm 2 , and formalin volatilization gas was passed through the device. After maintaining this state for 1 hour, the concentrations of formic acid and carbon monoxide before the inflow of the photocatalyst filter unit (initial) and after passing through the 1st, 2nd, 3rd and 4th stages of the filter unit were measured using a gas detector tube (Gastech Co., Ltd.: 81L). , 1LC).
  • test gas 50 mL of a 20% neutral buffered formalin solution (Fujifilm Wako Pure Chemical Industries, Ltd.) at 25°C with 3 ccm of dry air and a mixed gas of 197 ccm of dry air and 400 ccm of wet air were used.
  • This test gas contains about 6 ppm HCHO and about 6.5 ppm MeOH.
  • test gas was evacuated for 5 hours before being passed through the sample.
  • UV light having a wavelength of about 365 nm and an irradiation intensity of 7 mW/cm 2 was irradiated from above the sample, and the HCHO concentration after passing through the sample was measured by gas chromatography (GC-2010 Plus). The results are shown in FIGS. 19(a) and 19(b).
  • the photocatalyst filter of one embodiment of the present invention has high formaldehyde gas removal sustainability, and it is possible that the filter replacement period can be extended.
  • the sample 42 produced by the above method was placed in a 5 L gas bag 44 .
  • 50 mL of ammonia water with a concentration of 28 to 30% was placed in a 200 mL UM sample bottle, 0.5 mL of air in the bottle was sampled using a gas syringe.
  • the air sampled with the gas syringe was injected into the gas bag 44 .
  • the gas bag 44 contained about 85 ppm of the ammonia gas 41 .
  • the sample surface was irradiated with UV-LED light 43 having a wavelength of 365 nm and an intensity of 5.0 mW/cm 2 to activate the photocatalyst material.
  • a change in ammonia gas concentration over time for 7 hours from the start of UV-LED light irradiation was measured with a gas detector tube 45 (Gastech Co., Ltd., No. 3La). The results are shown in FIG.
  • the photocatalyst material of the present invention exhibited removal performance also for ammonia gas. From this, it was found that the photocatalyst filter and volatile compound removing device of the present invention can also be used to remove volatile inorganic compounds.
  • Photocatalyst filter 10 Volatile compound removal device 11 Inflow part 12 Light source 13 Photocatalyst filter 14 Volatile compound removal part 15 Ejection part 16 Finger insertion part 17 Working part 18 HEPA filter 19 Fan 20 Backup filter 30 Fume hood 41 Ammonia gas 42 Sample 43 UV-LED light 44 Gas bag 45 Detector tube

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Abstract

La présente invention concerne un matériau photocatalyseur comprenant un photocatalyseur et de la zircone. Lorsqu'une mesure XRD hors plan est effectuée sur la zircone, si l'intensité d'un pic dérivé de cristal à un angle de diffraction de 2θ = 28° ± 0,5° est représentée comme α (cps), et l'intensité d'un pic dérivé de cristal à un angle de diffraction de 2θ = 30° ± 0,5° est représentée comme β (cps), β/(α+β) est égal à 0,1 à 1.
PCT/JP2022/007900 2021-03-10 2022-02-25 Matériau photocatalyseur WO2022190901A1 (fr)

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WO2012014893A1 (fr) * 2010-07-29 2012-02-02 Toto株式会社 Couche photocatalytique comprenant une matière inorganique, son procédé de production et liquide de revêtement photocatalytique pour matière inorganique
WO2012014877A1 (fr) * 2010-07-29 2012-02-02 Toto株式会社 Corps revêtu de photocatalyseur et liquide de revêtement de photocatalyseur
WO2013100021A1 (fr) * 2011-12-29 2013-07-04 Toto株式会社 Matériau composite et composition de revêtement
JP2014171989A (ja) * 2013-03-11 2014-09-22 Rion Thermology Co Ltd 光触媒を用いた汚染空気の浄化装置
JP2018510767A (ja) * 2015-03-05 2018-04-19 シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイＳｈｅｌｌ Ｉｎｔｅｒｎａｔｉｏｎａｌｅ Ｒｅｓｅａｒｃｈ Ｍａａｔｓｃｈａｐｐｉｊ Ｂｅｓｌｏｔｅｎ Ｖｅｎｎｏｏｔｓｈａｐ メタン酸化触媒、それを調製する方法、及びそれを使用する方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007275292A (ja) * 2006-04-06 2007-10-25 Bridgestone Corp 消臭フィルタ及び消臭装置
JP2009270040A (ja) * 2008-05-09 2009-11-19 Sumitomo Chemical Co Ltd 非晶質のＺｒ−Ｏ系粒子を分散質とするゾル、その製造方法、このゾルをバインダーとする光触媒体コーティング液、およびその光触媒体コーティング液を塗布した光触媒機能製品の製造方法
WO2012014893A1 (fr) * 2010-07-29 2012-02-02 Toto株式会社 Couche photocatalytique comprenant une matière inorganique, son procédé de production et liquide de revêtement photocatalytique pour matière inorganique
WO2012014877A1 (fr) * 2010-07-29 2012-02-02 Toto株式会社 Corps revêtu de photocatalyseur et liquide de revêtement de photocatalyseur
WO2013100021A1 (fr) * 2011-12-29 2013-07-04 Toto株式会社 Matériau composite et composition de revêtement
JP2014171989A (ja) * 2013-03-11 2014-09-22 Rion Thermology Co Ltd 光触媒を用いた汚染空気の浄化装置
JP2018510767A (ja) * 2015-03-05 2018-04-19 シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイＳｈｅｌｌ Ｉｎｔｅｒｎａｔｉｏｎａｌｅ Ｒｅｓｅａｒｃｈ Ｍａａｔｓｃｈａｐｐｉｊ Ｂｅｓｌｏｔｅｎ Ｖｅｎｎｏｏｔｓｈａｐ メタン酸化触媒、それを調製する方法、及びそれを使用する方法

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