WO2006088022A1 - 光触媒、その製造方法、光触媒を含有する分散液および光触媒塗料組成物 - Google Patents
光触媒、その製造方法、光触媒を含有する分散液および光触媒塗料組成物 Download PDFInfo
- Publication number
- WO2006088022A1 WO2006088022A1 PCT/JP2006/302542 JP2006302542W WO2006088022A1 WO 2006088022 A1 WO2006088022 A1 WO 2006088022A1 JP 2006302542 W JP2006302542 W JP 2006302542W WO 2006088022 A1 WO2006088022 A1 WO 2006088022A1
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- WIPO (PCT)
- Prior art keywords
- photocatalyst
- substrate
- silicon oxide
- silicon
- silicate
- Prior art date
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- 239000000080 wetting agent Substances 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- B01J21/08—Silica
-
- 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
- B01J35/39—Photocatalytic 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- 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
- B01J37/08—Heat treatment
-
- 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
- C09D185/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Coating compositions based on derivatives of such 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
- 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
- B01J21/063—Titanium; 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
Definitions
- Photocatalyst method for producing the same, dispersion containing photocatalyst, and photocatalyst coating composition
- the present invention provides a photocatalyst excellent in photodecomposition activity of organic matter, a photocatalyst dispersion containing this photocatalyst, a photocatalyst coating composition, and a silicate to coat a silicon oxide film on a substrate having photocatalytic activity.
- the present invention relates to a method for producing a photocatalyst.
- Metal oxide semiconductors such as titanium and zinc oxide exhibit the property of absorbing light having energy corresponding to the bandwidth.
- the metal oxide semiconductor is used as a “photocatalyst” for water purification, antifouling, antibacterial, deodorizing, air purification. Attempts have been made to apply it to environmental cleanups such as firewood.
- photocatalysts commercially available photocatalysts P25 (manufactured by Nippon Aerosil Co., Ltd.) and ST-01 (manufactured by Ishihara Sangyo), which are acid titanium, are widely used.
- Techniques for improving photolytic activity include techniques for improving the shape of photocatalysts typified by particle size, film thickness, surface area, pore diameter, etc., and techniques for adding promoters, sensitizers, and the like. Widely known. It has also been proposed to compound a compound having another function with the photocatalyst, and complexed photocatalysts such as silica, alumina, zircoure, silica-alumina and zeolite are known.
- Photocatalysts containing silicon oxide include photocatalyst particles in which titer is coated with a porous silica film (see Patent Document 1), and a photo semiconductor that carries a silica-based film (see Patent Document 2). Is disclosed. Among these, in Patent Document 1, it is difficult to degrade organic fibers and resin when a photocatalyst is added to the organic fiber by mixing a porous silica film. That can be imparted, and that the photodegradation activity is uncoated. It is disclosed that it is comparable to a photocatalyst.
- Patent Document 2 an organohydrogenpolysiloxane is supplied to a photocatalyst in the gas phase to form a silica-based coating, and even when coated, the bactericidal activity under light irradiation conditions is more than the activity of the original photocatalyst. It is disclosed that
- Patent Document 1 Japanese Patent Laid-Open No. 09-276706
- Patent Document 2 Japanese Patent Laid-Open No. 62-260717
- Patent Document 3 Japanese Patent Laid-Open No. 11-240719
- Patent Document 4 US Patent No. 2885366
- Patent Document 5 Japanese Patent Laid-Open No. 10-180115
- Patent Document 6 WO93Z022386
- Patent Document 7 Japanese Patent Application Laid-Open No. 2004-161592
- Non-Patent Document 1 M. Hirano, etal., Chem. Mater. 2004, 16, 3725-3732
- an object of the present invention is to provide a photocatalyst having a structure coated with a silicon oxide film, which is superior in photolysis activity to a commercially available photocatalyst which is titanium oxide.
- a substrate having photocatalytic activity and an oxide silicon film substantially covering no pores covering the substrate and having an alkali metal content of lppm or more A photocatalyst is provided that is below pm.
- a method for producing a photocatalyst comprising a substrate having photocatalytic activity and a silicon oxide film having substantially no pores, which covers the substrate, comprising the following step (A): Including (B),
- (B) A step of separating the photocatalyst having the silicon oxide film and the substrate covered with the silicon oxide film from the aqueous medium.
- the photocatalyst according to the present invention has a structure including a substrate having photocatalytic activity and a silicon oxide film covering the substrate.
- substrate having photocatalytic activity is not yet defined. This is a coating photocatalyst, and the form thereof is not particularly limited, and particles, molded bodies, fibers, coating films, etc. can be used.
- photocatalyst is used as a concept including both an uncoated photocatalyst and a photocatalyst having a structure covered with an oxide silicon film.
- photocatalyst includes both a commercially available photocatalyst, titanium oxide, and a photocatalyst obtained by covering this titanium oxide with a silicon oxide film.
- the photocatalyst having a silicon oxide film is appropriately referred to as “an acid silicon-coated photocatalyst”.
- a photocatalytic activity that is significantly higher than that of a commercially available photocatalyst that is acid titanium can be provided.
- a method for producing such a silicon oxide-coated photocatalyst simply and economically can be provided.
- the photocatalyst coated with the silicon oxide film of the present invention has high photodecomposition activity
- the photocatalyst paint, photocatalyst coating film, photocatalyst molded article, and photocatalyst superior in photodecomposition activity compared to conventional photocatalysts It can be used for resin moldings. It is also possible to expand the application range of photocatalysts to places where the amount of light is scarce and conventional photocatalysts cannot be expected to have sufficient photolytic activity, such as surfaces of buildings that are not exposed to direct sunlight or indoors. it can. In addition, since it has a high photolytic activity, if it is applied to a purification apparatus, it is possible to improve the processing capacity and to realize a compact apparatus.
- FIG. 1 (A) to (D) show a log differential pore volume distribution curve (solid line) of a photocatalyst having a silicon oxide film and a photocatalyst having no silicon oxide film corresponding to the photocatalyst substrate. It is a figure which shows a log differential pore volume distribution curve (dotted line).
- FIG. 2 (A) to (C) are a log differential pore volume distribution curve (solid line) of a photocatalyst having a silicon oxide film and a log differential fine line of a photocatalyst not having a silicon oxide film corresponding to the photocatalyst substrate. It is a figure which shows a pore volume distribution curve (dotted line).
- FIG. 3 (A) is a diagram showing the time-dependent change of the acetaldehyde concentration in the gas, and (B) is a diagram showing the time-dependent change of the carbon dioxide concentration in the gas.
- a silicon oxide-coated photocatalyst according to the present invention comprises a substrate having photocatalytic activity and an acid-silicon film that does not have pores and covers the substrate, and contains an alkali metal.
- the amount is 1ppm or more and lOOOppm or less.
- the silicon oxide-coated photocatalyst means one obtained by coating the surface of a substrate having photocatalytic activity with a film made of silicon oxide. Therefore, the silicon oxide-coated photocatalyst is manufactured by forming a photocatalyst later in the presence of silicon oxide, or a photocatalyst immobilized on silicon oxide, or a silicon oxide and a photocatalyst formed in parallel in the same container. Contained complexes are not included.
- the mode in which the silicon oxide film covers the substrate is not particularly limited, and includes any of a mode in which a part of the substrate is coated and a mode in which the substrate is entirely coated. It is preferable that the surface of the substrate is uniformly coated with a film having an oxy-silicon power.
- a metal compound optical semiconductor As the substrate having photocatalytic activity (hereinafter, abbreviated as “substrate” as appropriate), a metal compound optical semiconductor can be used.
- metal compound optical semiconductors include titanium oxide, zinc oxide, tungsten oxide, and strontium titanate. Of these, titanium oxide, which has excellent photocatalytic activity, is harmless, and has excellent stability. preferable.
- titanium oxide include amorphous, anatase type, rutile type, brookite type and the like. Of these, the anatase type or rutile type, which are excellent in photocatalytic activity, or a mixture thereof is more preferable.
- one or more transition metals added to a metal compound optical semiconductor one or more typical elements of Group 14, Group 15, Z, or Group 16 added to a metal compound semiconductor It is also possible to use an optical semiconductor having two or more metal compound powers and a mixture of two or more metal compound semiconductors.
- metal compound optical semiconductor particles as the substrate, but it is also possible to use, for example, molded bodies, fibers, coating films, etc., in which a part of the surface of the metal compound optical semiconductor is exposed. It is.
- the substrate preferably contains a metal compound optical semiconductor having a specific surface area of 30 m 2 Zg or more.
- the specific surface area of the substrate fixed to a molded body, fiber, coating film, etc. should be subjected to a general BET method as a specific surface area measurement method. I can not. In such a case, calculate the "surface area" in terms of a sphere based on the primary particle diameter determined by X-ray diffraction analysis and the Sierra equation, or the primary particle diameter obtained using an electron microscope, and X-ray and electron diffraction analysis power The specific surface area can be obtained by grasping the crystal phase and calculating the “weight” from the true density of the crystal phase and the volume from which the spherical equivalent force can be obtained.
- examples of the alkali metal include lithium, sodium, potassium, rubidium, cesium, and francium. These alkali metals may contain one kind or two or more kinds. Of these, sodium and potassium are preferred, at least V is preferred.
- the alkali metal content in the photocatalyst can be quantified using an atomic absorption photometer (AA), an inductively coupled plasma emission analyzer (ICP), a fluorescent X-ray analyzer (XRF), or the like.
- AA atomic absorption photometer
- ICP inductively coupled plasma emission analyzer
- XRF fluorescent X-ray analyzer
- the alkali metal content in the photocatalyst according to the present invention is preferably 1 ppm or more, more preferably 1 Oppm or more. If it is 1 ppm or more, the effect of improving the photolytic activity is obtained, and if it is 10 ppm or more, the effect of improving the photolytic activity is remarkable.
- the reason why the photodegradation activity is improved by containing a predetermined amount of alkali metal is not necessarily clear, but is thought to be due to an improvement in the adsorption rate of the decomposition target product.
- the upper limit of the alkali metal content is preferably 100 ppm or less, more preferably 500 ppm or less.
- the upper limit of the alkali metal content is preferably 100 ppm or less, more preferably 500 ppm or less.
- “Substantially free of pores” is prepared using a substrate having photocatalytic activity to be used as a raw material when an acid-silicon-coated photocatalyst is produced, and a substrate having this photocatalytic activity.
- a substrate having photocatalytic activity For silicon oxide-coated photocatalysts, when the pore size distribution is compared in the region of 20 to 500 angstroms, it means that there are substantially no pores in the silicon oxide film.
- the pore size distribution of the photocatalytic activity substrate and the silicon oxide-coated photocatalyst is grasped by pore distribution measurement such as a nitrogen adsorption method, and the results are compared. It can be determined whether or not there are substantially no pores in the silicon film.
- the grasping method by the nitrogen adsorption method is described by the following methods (1) to (4).
- the presence or absence of pores in the silicon oxide silicon film can be determined.
- photocatalyst particles are used as the substrate will be described.
- the presence or absence of pores in the silicon oxide film can be substantially determined.
- the two log differential pore volume distribution curves are compared, and the log differential pore volume of the silicon oxide-coated photocatalyst in the region of 10-: L000 angstrom is 0.1 lmlZg or more than the log differential pore volume of the photocatalyst particles. It is more preferable that the area does not exist.
- the silicon oxide film has pores, it is difficult to improve the photolytic activity.
- the presence of pores facilitates light scattering and reflection at the silicon oxide film, reducing the amount of ultraviolet light that reaches the substrate having photocatalytic activity, and photocatalytic excitation. This is presumably due to a decrease in the generation amount of holes and electrons.
- those with pores have photocatalytic activity as a result of increasing the thickness of the silicon oxide film by the volume of the pores compared to those without pores. Since the physical distance between the substrate and the organic substance to be decomposed becomes large, it is assumed that sufficient photolytic activity cannot be obtained.
- Silicon supported amount per surface area lm 2 of silicon oxide coated photocatalyst according to the present invention, a silicon content containing silicon oxide coated photocatalyst is calculated value calculated from the surface area of the silicon oxide coated photocatalyst.
- the surface area of the silicon-coated silicon oxide photocatalyst is the amount of silicon supported per lm 2.
- the amount of silicon supported per m 2 is 0.1 lOmg or more and 2. Omg or less, preferably 0.12mg or more and 1.5mg or less, more preferably 0.16mg or more and 1. Omg or less. Less than lOmg, the improvement effect of photolysis activity is small because the activity improvement effect by the silicon oxide silicon film is not enough.
- the surface area of the substrate and the silicon oxide-coated silicon photocatalyst was measured by a BET specific surface area measurement device using nitrogen adsorption / desorption after heat treatment at 150 ° C for 15 minutes under a dry gas flow with a dew point of 195.8 ° C or less. Can be measured.
- a conventional method for producing a photocatalyst having a structure covered with a silicon oxide film has the following problems.
- the raw material for the silicon oxide film can be made inexpensive and no alcohol is by-produced during the manufacturing.
- an organic medium, alcohol, or the like is not used, so that an explosion-proof expensive dedicated facility is not required and waste liquid treatment is complicated. Do not turn.
- the treatment can be performed in a liquid phase, it is relatively easy to arbitrarily control the amount of silicon supported.
- the substrate is coated with the silicon oxide film, since the pH of the mixed solution containing both the substrate and the silicate is 5 or less, the solution containing the silicate compound can exist stably, and Thus, silicon oxide having substantially no pores can be formed on the surface of the substrate.
- the aqueous medium water or a mixed liquid containing water as a main component and containing an organic solvent that is soluble in water among aliphatic alcohols, aliphatic ethers, and the like.
- the aqueous medium include water and mixed liquids of water and methyl alcohol, water and ethyl alcohol, water and isopropanol, and the like. Of these, water is preferred.
- these water and mixed liquid can be used individually by 1 type or in combination of 2 or more types.
- the aqueous medium includes an aliphatic alcohol, an aliphatic ether, etc., an organic solvent that can be dissolved in water, an aliphatic amine, Surfactants such as aromatic polyethers and gelatins can also be mixed.
- silicate silicic acid and a salt of Z or an oligomer thereof may be used, and two or more kinds may be mixed and used.
- Sodium salts and potassium salts are more preferable because they can eliminate the preferred dissolution step from the viewpoint of industrial availability, so that an aqueous solution of sodium silicate (JIS K1408 “water glass”) can be used.
- a coating method comprising a step of mixing at least one set of the above and a step of aging the mixed solution.
- the coating of the silicon oxide film on the substrate gradually proceeds.
- the pH is maintained at 5 or less in the absence of a substrate, the condensate of silicic acid compound is difficult to precipitate alone from silicic acid, silicic acid ions and Z or oligomers thereof.
- the surface of the substrate acts as a condensation catalyst for the silicate compound, and a silicon oxide film is rapidly formed only on the surface of the substrate. That is, the acidic region having a pH of 5 or less is a region in which a solution containing a silicate compound can be stably present and silicon oxide can be formed in a film shape on the surface of the substrate.
- the acid a strong mineral acid that can be used with any acid is preferably used. Only one kind of acid may be used, or two or more kinds of acids may be mixed and used.
- the base is neutralized with the total amount of the base components contained in the silicate, and a sufficient amount of acid is previously present in the aqueous medium so that the pH is 5 or lower. It is not necessary to use it separately.
- any base can be used. Of these, alkali metal hydroxides such as potassium hydroxide and sodium hydroxide are preferably used.
- reaction conditions such as reaction temperature and reaction time when the mixed solution is aged and the silicon oxide film is coated on the substrate are conditions that do not adversely affect the production of the target silicon oxide-coated photocatalyst. If there is no particular limitation.
- the reaction temperature is preferably 10 ° C or higher and 200 ° C or lower, more preferably 20 ° C or higher and 80 ° C or lower.
- silicic acid compounds that is, silicon oxide fine particles and Z or gel, etc. are likely to be formed, so that the silicon oxide film becomes porous or locally oxidized on the substrate surface. Silicon may be formed.
- the aging time is preferably 10 minutes or more and 500 hours or less, more preferably 1 hour or more and 100 hours or less. If it is less than 10 minutes, the coating with the silicon oxide silicon film does not proceed sufficiently, and the effect of improving the photolytic activity by the coating may not be sufficiently obtained. If it is longer than 500 hours, the substrate having photocatalytic activity is sufficiently covered with the silicon oxide film and the photolytic activity is improved, but the productivity of the silicon oxide-coated photocatalyst may deteriorate.
- the concentration of the substrate having photocatalytic activity contained in the mixed solution is preferably 1 wt% or more and 50 wt% or less, more preferably 5 wt% or more and 30 wt% or less. If it is less than 1% by weight, the productivity of the silicon oxide-coated photocatalyst will be deteriorated. If the concentration is higher than 50% by weight, the coating of the silicon oxide film on the substrate will not proceed uniformly, and the effect of improving the photolysis activity will be improved. It may not be obtained sufficiently.
- the concentration of silicon contained in the mixed solution is preferably 0.05 to 5% by weight, more preferably 0.1 to 3% by weight.
- the silicon concentration is less than 0.05% by weight, the condensation of the silicate compound is delayed, and the substrate may not be sufficiently covered with the silicon oxide film. If the silicon concentration is higher than 5% by weight, the coating of the silicon oxide film on the substrate may not proceed uniformly.
- the ratio of the amount of the substrate having photocatalytic activity and the amount of silicate used is not less than 0. OlmgZm 2 and not more than 0.50 mg Zm 2 as silicon atoms per surface area lm 2 of the substrate.
- Step of forming a silicon oxide film that is, at least one of an aqueous medium containing the substrate and a silicate, an aqueous medium containing the silicate and the substrate, and an aqueous medium containing the substrate and an aqueous medium containing a silicate
- the desired silicon oxide film can be formed on the surface of the substrate, and the silica, silicate ions, and Z or their oligomers remain unreacted without being condensed on the surface of the substrate. Therefore, a silicon oxide film having a small hole is rarely formed.
- Omg / m 2 or less as the ratio increases, the amount of unreacted material increases and a silicon oxide film having pores may be formed. This can be avoided by shortening the treatment time against the occurrence of pores due to the progress of condensation.
- Step a mixing at least one set of an aqueous medium containing a substrate and a silicate, an aqueous medium containing a silicate and a substrate, and an aqueous medium containing a substrate and an aqueous medium containing a silicate;
- Step c A step of separating and washing the silicon oxide-coated photocatalyst from the aqueous medium without neutralizing the mixed solution ,
- Step d A production method comprising the steps of drying and Z or calcining the silicon oxide-coated photocatalyst, and maintaining the pH of the aqueous medium containing both the substrate and the silicate at 5 or less in Step a and Step b. Can be mentioned.
- the method for separating the silicon oxide-coated photocatalyst from the mixed solution is not particularly limited. However, known methods such as filtration, vacuum filtration, pressure filtration, and centrifugal separation can be suitably used.
- the method for cleaning the silicon oxide-coated photocatalyst is not particularly limited. For example, redispersion in pure water and filtration, desalting cleaning by ion exchange treatment, and the like can be suitably used. Further, depending on the use of the silicon oxide-coated photocatalyst, the cleaning step can be omitted.
- the method for drying the silicon oxide-coated photocatalyst is not particularly limited, and for example, air drying, vacuum drying, heat drying, spray drying, and the like can be suitably used. Further, depending on the use of the silicon oxide-coated photocatalyst, the drying step can be omitted.
- the method for firing the silicon oxide-coated photocatalyst is not particularly limited, and for example, reduced-pressure firing, air firing, nitrogen firing and the like can be suitably used. Usually, firing can be carried out at a temperature of 200 ° C to 1200 ° C, but 400 ° C to 1000 ° C is preferred, and 400 ° C to 800 ° C is more preferred.
- the firing temperature is less than 200 ° C, a desired silicon oxide film is not formed on the substrate surface, and sufficient photolytic activity cannot be obtained.
- the calcination temperature is higher than 1200 ° C, the silicon oxide-coated photocatalyst is sintered and sufficient photolytic activity cannot be obtained. Further, depending on the use of the silicon oxide-coated photocatalyst, the firing step can be omitted.
- the photocatalyst according to the present invention can be used in the form of a dispersion and a coating composition, if necessary. Furthermore, it is well-known, such as high activation, imparting visible light responsiveness, compounding with antibacterial metal compounds, imparting dispersibility by surface modification, or suppressing degradation of photocatalyst-containing materials by compounding with compounds that are inactive as photocatalysts. It can also be used as a raw material for the photocatalyst improvement method.
- Examples of the improved methods include, for example, a method in which a platinum compound is loaded to achieve high activation and visible light responsiveness, a method in which a silver compound or a copper compound is loaded to improve antibacterial properties, and surface treatment with an organosilicon compound
- a method of imparting dispersibility to an organic medium by modifying the surface of the photocatalyst to an organic medium property by applying the above and a method of combining with a hydroxyapatite.
- the photocatalyst dispersion liquid according to the present invention contains the photocatalyst according to the present invention, a liquid medium, and a dispersion stabilizer.
- This dispersion can be used as it is for ceramics, glass, film, wallpaper, building materials, curtains, clothing, tableware, etc., and as a raw material for photocatalyst-containing materials and photocatalyst coating compositions. Is also possible.
- the liquid medium include water, alcohols such as methyl alcohol and ethyl alcohol, aromatics such as benzene, toluene and xylene, esters such as ethyl acetate, and ketones such as acetone. Although it can be used suitably according to the application, it is more desirable to use water from the viewpoint of environmental harmony.
- ionic surfactants As the dispersion stabilizer, ionic surfactants, wetting agents, thickeners, acids, bases and the like can be suitably used. Among these dispersion stabilizers, one kind may be contained, or two or more kinds may be contained.
- the surfactant from the viewpoint of dispersibility, ionic surfactants such as carboxylate, sulfonate, sulfate ester salt, phosphate ester salt, alkylamine salt and quaternary ammonium salt are used. It is more desirable.
- the concentration of the silicon oxide-coated photocatalyst contained in the photocatalyst dispersion liquid is not particularly limited! However, it is desirable that the concentration be from 2% by weight to 50% by weight. It is more desirable to have it. If it is 2% by weight or less, the concentration of the silicon oxide-coated photocatalyst contained in the dispersion may be lowered, resulting in poor economic efficiency. If it is 50% by weight or more, the dispersibility of the silicon oxide-coated photocatalyst contained in the dispersion may deteriorate.
- the concentration of the dispersion stabilizer contained in the photocatalyst dispersion liquid is not particularly limited! However, the total amount of the dispersion stabilizer may be 1 wt% or more and 1000 wt% or less based on the silicon oxide-coated photocatalyst. Desirable It is more desirable to be 2 to 200% by weight. If it is 1% by weight or less, the dispersion of the silicon oxide-coated photocatalyst by the dispersion stabilizer may not sufficiently proceed. When it is 1000% by weight or more, the active ingredient exhibiting photocatalytic action may be lowered when the dispersion is actually used.
- the equipment to be used is not particularly limited, but wet dispersion equipment such as a ball mill pulverizer, a bead mill pulverizer, an ultrasonic pulverizer, and a high-pressure wet atomizer is preferable. It can be used. When dispersing, these wet dispersion devices may be used alone or a plurality of devices may be used in succession. In addition, before the dispersion with the wet pulverizer, coarse pulverization may be performed with a pulverizer such as a dry pulverizer.
- the photocatalyst coating composition of the present invention includes the photocatalyst according to the present invention, a liquid medium, and a binder.
- This photocatalyst coating composition is used in the manufacturing process of processed products such as ceramics, plate glass, films, wallpaper, building materials, curtains, clothing and tableware, and the articles in use. It can also be used for glass, exterior and interior walls of buildings, road surfaces, noise barriers, tunnel walls, signs, and lighting. When applied and used, it may be applied directly to the article, or it may be applied after coating one or more intermediate layers for improving adhesion and protecting the substrate.
- liquid medium examples include water, alcohols such as methyl alcohol and ethyl alcohol, aromatics such as benzene, toluene and xylene, esters such as ethyl acetate, and ketones such as acetone. Depending on the application, only one or a mixture of two or more can be used. However, from the viewpoint of environmental harmony, it is preferable to use water as the liquid medium.
- binder examples include silicon compounds such as colloidal silica, silicone resin, alkoxy silane and partial hydrolysates thereof, and organoalkoxy silane which is alkoxy silane partially substituted with a hydrocarbon group, ortho titanium Titanium compounds such as acid, titanium peroxide, titanium alkoxide, titanium acetylacetonate, titanium oxide sol, and organic polymers such as acryl, urethane, and fluorine resin can be used alone. You may also mix two or more. In addition, a block polymer body or a gradient polymer having two or more kinds of partial structures in one molecule can be used. Of these, titanium compounds, silicon compounds, and fluorine resins are preferable because they are hardly decomposable.
- a titanium compound and a silicon compound are preferable because there are wide restrictions on the heat treatment after coating.
- colloidal silica, orthotitanic acid, titanium peroxide, and titanium oxide sol, which are completely inorganic, are more preferable.
- the photocatalyst coating composition according to the present invention may be any method as long as it is a wet processing method having a dispersing or pulverizing effect without any particular limitation on the manufacturing method.
- the photocatalyst coating composition is applied to a substrate, it is dried and Z or baked to form a composite comprising the photocatalyst and the substrate according to the present invention.
- a binder that is only inorganic it is preferable to improve the strength of the film by heating, so an inorganic material with high heat resistance Consist of A substrate is suitable.
- the inorganic material having high heat resistance glass, metal, ceramics and the like are suitably used.
- photocatalyst the difference between an uncoated photocatalyst and a photocatalyst having a structure coated with a silicon oxide film is also referred to as “photocatalyst”.
- alkali metal content was measured as alkali metal content.
- alkali metals other than sodium are not substantially contained and are below the detection limit.
- sodium content was quantified using an atomic absorption photometer (Z-5000, Hitachi, Ltd.).
- the detection limit is lppm. Therefore, “sodium cannot be detected” means that it does not contain sodium, or indicates that its content is less than lppm!
- the silicon content was quantified using X-ray fluorescence analysis (LAB CENTER XRE-1700, Shimadzu Corporation).
- the specific surface area was measured with a BET specific surface area measuring device.
- the photocatalyst 1 had a sodium content of 87 ppm.
- the photocatalyst 1 had a silicon content of 6.9% by weight and a specific surface area of 212.8 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 1 was 0.33 mg.
- Photocatalyst 2 was obtained in the same manner as in Example 1 except that the amount of titanium dioxide was 82. lg and the pH of the mixed solution C was 4.0. This photocatalyst 2 had a sodium content of 56 ppm, a silicon content of 2.4% by weight, and a specific surface area of 133.8 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 2 was 0.18 mg.
- Photocatalyst 3 was obtained in the same manner as in Example 1 except that the amount of titanium dioxide was 38.9 g and the pH of mixture C was 2.8. This photocatalyst 3 had a sodium content of 85 ppm, a silicon content of 4.6 wt%, and a specific surface area of 194.9 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 3 was 0.24 mg.
- Photocatalyst 4 was obtained in the same manner as in Example 1 except that the amount of titanium dioxide was 12.2 g and the pH of mixture C was 2.5. This photocatalyst 4 had a sodium content of 160 ppm, a silicon content of 9.6% by weight, and a specific surface area of 244.2 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 4 was 0.39 mg.
- Photocatalyst 5 was obtained in the same manner as in Example 1 except that 6.5 g of an aqueous sodium silicate solution was used and the pH of the mixed solution C was 2.6. This photocatalyst 5 had a sodium content of 34 ppm, a silicon content of 1.4% by weight, and a specific surface area of 61.lm 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 5 was 0.22 mg.
- Example 6 70.5 g of PC-102 (Titanium Industry Co., Ltd., anatase type, 5% adsorbed moisture, specific surface area of 137 m 2 Zg by BET specific surface area measuring device) was used as the diacid titanium.
- Photocatalyst 6 was obtained in the same manner as in Example 1 except that the pH became 3.8 and the mixture C was aged by stirring for 16 hours.
- This photocatalyst 6 had a sodium content of 12 ppm, a silicon content of 2.2% by weight and a specific surface area of 127.8 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 6 was 0.18 mg.
- the photocatalyst 7 was obtained in the same manner as in Example 6 except that the value became 2.4.
- This photocatalyst 7 has a sodium content of 17 ppm, a silicon content of 5.5% by weight and a specific surface area of 207.2 m 2 /. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 7 was 0.27 mg.
- a photocatalyst 8 was obtained in the same manner as in Example 1 except that the mixture C was aged by stirring for 16 hours.
- This photocatalyst 8 had a sodium content of 180 ppm, a silicon content of 5.7 wt%, and a specific surface area of 246.2 m 2 Zg. Therefore, the silicon content per surface area lm 2 of the photocatalyst 8 was 0.23 mg.
- Photocatalyst 9 was obtained in the same manner as in Example 8, except that redispersion in 500 mL of water and vacuum filtration were repeated 7 times.
- This photocatalyst 9 had a sodium content of 120 ppm, a silicon content of 5.7 wt%, and a specific surface area of 231.4 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 9 was 0.25 mg.
- Photocatalyst 10 was obtained in the same manner as in Example 8, except that washing was performed by performing redispersion in 500 mL of water and filtration under reduced pressure once.
- This photocatalyst 10 had a sodium content of 210 ppm, a silicon content of 5.7 wt%, and a specific surface area of 231.4 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 10 was 0.24 mg.
- Example 11 Example 11
- Photocatalyst 11 was obtained in the same manner as in Example 1 except that the baking treatment was performed at 400 ° C. for 3 hours.
- This photocatalyst 11 has a sodium content of 93 ppm, a silicon content of 6.9% by weight, a specific surface area of 255
- Photocatalyst 12 was obtained in the same manner as in Example 1 except that the baking treatment was performed at 800 ° C. for 3 hours.
- This photocatalyst 12 has a sodium content of 98 ppm, a silicon content of 6.9 wt%, a specific surface area of 150
- Photocatalyst 13 was obtained in the same manner as in Example 1 except that the baking treatment was performed at 900 ° C. for 3 hours.
- This photocatalyst 13 has a sodium content of 96 ppm, a silicon content of 6.9% by weight, a specific surface area of 108
- a photocatalyst 14 was obtained in the same manner as in Example 1 except that the calcination treatment was performed at 1000 ° C. for 3 hours.
- This photocatalyst 14 has a sodium content of 92 ppm, a silicon content of 6.9% by weight, and a specific surface area of 55.
- the amount of silicon supported per lm 2 of surface area of photocatalyst 14 is 1.25 mg.
- Photocatalyst 15 was obtained in the same manner as in Example 8, except that 1N nitric acid aqueous solution was used instead of 1N hydrochloric acid aqueous solution, and pH of mixture C was 3.2.
- This photocatalyst 15 had a sodium content of 480 ppm, a silicon content of 6.7% by weight, and a specific surface area of 207.4 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 15 was 0.32 mg.
- Photocatalyst 16 was obtained in the same manner as in Example 8 except that 3 g was used. This photocatalyst 16 had a sodium content of 150 ppm, a silicon content of 3.4% by weight, and a specific surface area of 210.5 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 16 was 0.16 mg.
- Titanium dioxide (ST-01, Ishihara Sangyo Co., Ltd., adsorbed water content 9% by weight, specific surface area 300 m 2 Zg) was dried in air at 200 ° C. to obtain Photocatalyst 17.
- This photocatalyst 17 had a sodium content of 1400 ppm and a specific surface area of 214.3 m 2 / g.
- Photocatalyst 18 was obtained in the same manner as in Comparative Example 1 except that calcination was performed at 600 ° C instead of 200 ° C.
- the specific surface area of this photocatalyst 18 was 53.5 m 2 Zg.
- Photocatalyst 19 was obtained in the same manner as in Comparative Example 1 except that calcination was performed at 1000 ° C. instead of 200 ° C.
- the specific surface area of this photocatalyst 19 was 0.7 m 2 Zg.
- Titanium dioxide (P25, Nippon Aerosil Co., Ltd., purity 99.5%, specific surface area 50.8 m 2 Zg) was dried in air at 200 ° C. to obtain photocatalyst 20.
- the sodium content of this photocatalyst 20 was undetectable.
- This photocatalyst 20 had a specific surface area of 50.2 m 2 Zg.
- Photocatalyst 21 was obtained in the same manner as in Comparative Example 4 except that calcination was performed at 500 ° C. instead of 200 ° C.
- the specific surface area of this photocatalyst 21 was 48.7 m 2 Zg.
- Photocatalyst 22 was obtained in the same manner as in Comparative Example 4 except that it was calcined at 1000 ° C. instead of 200 ° C.
- the specific surface area of this photocatalyst 22 was 1. lm 2 Zg.
- Titanium dioxide (PC-102, Titanium Industry Co., Ltd., 5% adsorbed water, specific surface area by BET specific surface area measuring device 137m 2 Zg) was dried in air at 200 ° C and photocatalyst 23 did.
- This photocatalyst 23 had a sodium content of 28 ppm and a specific surface area of 136.3 m 2 Zg.
- Titanium dioxide (AMT-100, Tika Co., Ltd., adsorbed moisture 11%, specific surface area measured by BET specific surface area measuring device 290m 2 Zg) was dried in air at 200 ° C to make photocatalyst 24 .
- This photocatalyst 24 had a sodium content of 46 ppm and a specific surface area of 220.2 m 2 Zg.
- JP-A-62-260717 it was carried out using P25 (Nippon Aerosil Co., Ltd., purity 99.5%, specific surface area 50.8 m 2 / g) as titanium dioxide.
- Photocatalyst 26 was obtained.
- the sodium content of this photocatalyst 26 was undetectable.
- the photocatalyst 26 had a silicon content of 2.2% by weight and a specific surface area of 38.7 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 26 was 0.56 mg.
- This photocatalyst 27 had a sodium content of 22 ppm, a silicon content of 2.9% by weight, and a specific surface area of 164.9 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 27 was 0.17 mg.
- Photocatalyst 27 was calcined at 600 ° C. for 3 hours to obtain photocatalyst 28.
- This photocatalyst 28 had a sodium content of 25 ppm, a silicon content of 3.0% by weight, and a specific surface area of 76.0 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 28 was 0.39 mg.
- Titanium dioxide (ST-01, Ishihara Sangyo Co., Ltd., adsorbed water content 9% by weight, specific surface area 300 m 2 Zg) 24 5 g was dispersed to make liquid A.
- water lOOg and sodium silicate aqueous solution (SiO
- This photocatalyst 29 had a sodium content of 1400000 ppm, a silicon content of 3.4% by weight, and a specific surface area of 126.lm 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 29 was 0.27 mg.
- titanium dioxide P-25, Nippon Aerosil Co., Ltd., purity 99.5%, specific surface area 50.8 mg by BET specific surface area measuring device. 10. Og is dispersed and A Liquid. A 4N sodium hydroxide aqueous solution was added dropwise thereto to adjust the pH to 10.5. Then, the solution was heated to a temperature of 75 ° C and maintained at 75 ° C. Sodium silicate aqueous solution (SiO content: 29.1 wt%, NaO content: 9.5 wt%, JIS K1408 "water glass 3
- the obtained solid was pulverized in a mortar and then subjected to calcination treatment at 600 ° C. for 3 hours to obtain photocatalyst 30.
- the sodium content was 2500 ppm
- the silicon content was 13.0% by weight
- the specific surface area was 68.4 mg, so that the amount of silicon supported per surface area lm 2 of the photocatalyst 30 was 1.90 mg.
- the obtained solid was pulverized in a mortar and then subjected to a baking treatment at 600 ° C. for 3 hours to obtain a photocatalyst 31.
- This photocatalyst 31 had a sodium content of 5900 ppm, a silicon content of 12.0% by weight, and a specific surface area of 258.3 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of photocatalyst 31 was 0.47 mg.
- a photocatalyst 32 was obtained in the same manner as in Example 16 except that it was calcined.
- This photocatalyst 32 had a sodium content of 190 Oppm, a silicon content of 6.5% by weight, and a specific surface area of 2.6 m 2 Zg. Therefore, the amount of silicon supported per surface area lm 2 of the photocatalyst 32 was 24.7 mg.
- a mixed solution C was prepared in the same manner as in Example 1 except that titanium dioxide was not used, and stirring was continued for 3 days. As a result, the liquid mixture C remained colorless and transparent, and as a result of suction filtration using a membrane filter, no solid content was obtained.
- the photocatalysts 1 to 32 of Examples 1 to 16 and Comparative Examples 1 to 16 were suspended in an aqueous methylene blue solution. Thereafter, light irradiation was performed, and the photodegradation activity was tested by quantifying the concentration of methylene blue in the solution by spectroscopic analysis.
- the detailed test operation method is as follows.
- Standard suspension cell made of quartz (Tosoichi, Quartz Co., Ltd., outer dimensions 12.5 X 12.5) with 3.5 cc of the suspension after pre-adsorption treatment and pre-filled with a Teflon (registered trademark) stirrer X 45 mm, optical path width 10 mm, optical path length 10 mm, volume 4.5 cc) Weighed and stirred with a magnetic stirrer.
- light was irradiated for 5 minutes from the lateral Z direction of the spectroscopic cell. Light irradiation was performed through a quartz filter container filled with pure water using the light source device SX-UI151XQ (Ushio Corporation, 150 W xenon short arc lamp) as a light source.
- the irradiation light quantity was 5.
- UVD-365PD ultraviolet illuminance meter
- a membrane filter (Toyo Roshi Kaisha, Ltd., DISMIC-13HP) was attached to an all plastic lOcc syringe. The sample suspension before and after the light irradiation was put into this, respectively, and extruded with a piston to remove the photocatalyst. At that time, the first half of the filtrate was discarded, and the latter half of the filtrate was collected in a semi-micro type disposable cell for visible light analysis (made of polystyrene, optical path width 4 mm, optical path length 10 mm, volume 1.5 cc). Then, using a UV-visible spectrophotometer (UV-2500, Shimadzu Corporation), the absorbance at a wavelength of 680 nanometers was measured, and the methylene blue concentration was calculated.
- UV-visible spectrophotometer UV-2500, Shimadzu Corporation
- the photolytic activity was evaluated based on the methylene blue concentration after light irradiation with respect to the methylene blue concentration before light irradiation.
- Table 1 shows the methylene blue removal rate as a photolytic activity.
- the methylene blue adsorption rate was calculated from the methylene blue concentration before light irradiation based on the charged concentration of methylene blue (concentration of methylene blue before adding photocatalyst), and is also shown in Table 1. ⁇
- the presence or absence of pores derived from the silicon oxide film of photocatalysts 1 to 16, photocatalysts 25 and 26, and photocatalysts 29 to 32 was determined. Specifically, the log differential pore volume distribution curves of the photocatalyst used as a raw material and the photocatalyst coated with a silicon oxide film prepared using this photocatalyst as a base (base catalyst) were compared. The presence or absence of pores derived from the silicon oxide film was determined.
- Table 1 shows the presence or absence of pores derived from the silicon oxide film in the region of 20 to 500 angstroms of photocatalysts 1 to 16, photocatalysts 25 and 26, and photocatalysts 29 to 32.
- the amount of silicon charged to the substrate The value obtained by dividing the weight of silicon atom (mg) contained in the used silicate (sodium silicate aqueous solution) by the total surface area (m 2 ) of the substrate used (diacid-titanium particles). Indicates.
- Fig. 1 (A)-(D) log differential pore volume distribution curve of photocatalyst with silicon oxide film (solid line) And a log differential pore volume distribution curve (dotted line) of a photocatalyst having no silicon oxide film corresponding to the photocatalyst substrate.
- photocatalyst 1 After photocatalyst 1, photocatalyst 17 or photocatalyst 21 is fixed to a glass plate, it is irradiated with light in the presence of a acetoaldehyde gas, and the concentration of acetoaldehyde in the gas is quantified by gas chromatography. Was tested.
- the detailed test operation method is as follows.
- the wide-mouth bottle was taken out, and the glass beads were filtered off with a nylon mesh sheet to obtain an ethanol dispersion of photocatalyst 1.
- the slide glass (2.6 cm X 7.6 cm, thickness lmm), whose weight was measured in advance, was dipped into the ethanol dispersion of the photocatalyst 1 and pulled up. Every 90 seconds, 2/3 of the slide glass was immersed 12 times at a speed of 0.4 cm per second.
- the slide glass was dried at room temperature.
- the photocatalyst 1 adhering to the other surface was removed by rubbing with a glass plate except for one side of the slide glass of 2.6 cm ⁇ 7.6 cm (one surface of the slide glass).
- a photocatalyst sample plate A was prepared by subjecting the slide glass to firing at 400 ° C. for 3 hours in an air atmosphere in an electric furnace.
- the photocatalyst 1 applied weight was 6. lmg and the application area was 11.7 cm 2 .
- Rino coating weight was 5. 2gZm 2.
- Photocatalyst sample plate B was prepared in the same manner as described above except that photocatalyst 17 was used instead of photocatalyst 1 and dipping and pulling were performed once.
- photocatalyst 17 applied weight was 5.9 mg
- the application area was 11.8 cm 2 , per area The coating weight of 5. Og / m 2
- Photocatalyst sample plate C was prepared in the same manner as described above except that photocatalyst 21 was used instead of photocatalyst 1 and dipping and lifting were performed three times.
- photocatalyst 21 applied weight was 6. lmg, the application area was 12.5 cm 2 , per area The coating weight of 4.9 g / m 2
- Photocatalyst sample plates A, B, and C prepared in the above were irradiated with ultraviolet rays of 5.4 mWZcm 2 for 3 hours in an air atmosphere.
- a 27W black light blue lamp (Sankyo Electric Co., Ltd., FPL27BLB) was used as the light source, and 1 ⁇ ⁇ -365 (manufactured by Custom Co., Ltd.) was used for the ultraviolet intensity measurement.
- Tedlar DuPont registered trademark
- Tedlar DuPont registered trademark
- Each of the photocatalyst sample plates A to C that had been subjected to ultraviolet irradiation treatment was put and adhered to the center of the bag with a 5 mm square double-sided tape. Then, it was sealed with a hitler. Subsequently, the internal air was extracted from the mini-cock using a vacuum pump, and the cock was closed with power, and left in the dark overnight.
- the photocatalyst sample plate was irradiated with light using a full white fluorescent lamp (Matsushita Electric Works, 10W, FL10N), and the gas inside the bag was analyzed every 2 hours. At this time, the surface of the photocatalyst sample plate on which the photocatalyst was fixed was placed at a distance of 4 cm in fluorescent lamp power. The UV intensity measured at the same place with the same film as the bag as one filter is 11 WZ cm.
- Fig. 3 (A) shows the time-dependent change of the acetonitrile concentration in the gas inside the nog.
- Figure 3 (B) shows the change over time in the concentration of carbon dioxide in the gas inside the bag.
- a yellow viscous liquid containing titanium was prepared according to Example 1 of Japanese Patent No. 2938376.
- the prepared solution had a pH of 6.3.
- photocatalyst sample plates D and E were produced by heating at 200 ° C. for 3 hours.
- the coating films of the photocatalyst sample plates D and E had such a strength that they could not be removed even when rubbed with a finger.
- the two glass slides are 1. lmg, 1. Omg, The amount was increasing.
- the methylene blue photolytic activity of the photocatalyst sample plates D and F was evaluated by the following method. First, a test piece of 0.8 cm X 7.2 cm X lmm was cut out from the photocatalyst sample plates D and F. Next, in a quartz standard spectroscopic cell containing the same stirrer used in “1. Methylene blue photolysis activity evaluation” in “Evaluation of photocatalysts 1 to 32 of Examples 1 to 16 and Comparative Examples 1 to 16” put 40 X 10 _6 molZL methylene blue solution 3mL of, the specimens were fixed in a state where the one end where the photocatalyst film coating 2. immersed 5cm min.
- the surface opposite to the surface where the photocatalyst of the test piece was fixed was brought into close contact with the inner surface of the quartz standard spectroscopic cell. Then, after stirring in the dark for 1 hour, the solution in the spectroscopic cell was once recovered, and methylene blue was quantified with a spectrophotometer. Thereafter, the solution was returned again into the spectroscopic cell, and light was irradiated from the lateral Z side of the spectroscopic cell.
- the irradiation apparatus was the same as that used in “1. Evaluation of methylene blue photolysis activity” in “Evaluation of photocatalysts 1 to 32 of Examples 1 to 16 and Comparative Examples 1 to 16”.
- the solution in the spectroscopic cell was collected, and methylene blue was quantified in the same manner as before irradiation.
- the methylene blue decomposition rates of the test pieces cut out from the photocatalyst sample plates D and F were 15.3, 29.1%, respectively.
- a photocatalyst dispersion was prepared.
- 10.0 g of photocatalyst 1 prepared according to the method described in Example 1 100 g of zirconium oxide beads having a diameter of 3 mm, 85.0 g of water, Boise 521 (Kao)
- the glass wide-mouth bottle is sealed, and the vibration mill device (5400 double type, RED
- the product was pulverized for 3 hours using DEVIL. After pulverization, the beads were separated by filtration to obtain a photocatalyst dispersion 1.
- This photocatalyst dispersion 1 did not settle for solids even after 30 days storage in the dark, and had no problem with dispersion stability.
- Photocatalyst dispersion liquid 2 was obtained in the same manner as in Example 18, except that the weight of water was 87.5 g and the weight of Boise 521 was 2.5 g. This photocatalyst dispersion 2 did not have a problem in dispersion stability because the solid content did not settle even when stored in a dark place for 30 days.
- Photocatalyst dispersion 3 was obtained in the same manner as in Example 18, except that the weight of Photocatalyst 1 was 30.0 g, the weight of water was 55.0 g, and the weight of Boise 521 was 15. Og. This photocatalyst dispersion 3 did not have a problem in dispersion stability because the solid content did not settle even when stored for 30 days in the dark.
- Example except that BYK- 154 (produced by BYK Japan, Ammonium salt of acrylic copolymer, solid content concentration: 42%) instead of Boise 521 was changed to 5. Og as a dispersion stabilizer. In the same manner as in 18, a photocatalyst dispersion 4 was obtained. This photocatalyst dispersion 4 did not settle for solids even after storage in a dark place for 30 days, and had no problem in dispersion stability.
- BYK- 154 produced by BYK Japan, Ammonium salt of acrylic copolymer, solid content concentration: 42%) instead of Boise 521 was changed to 5. Og as a dispersion stabilizer.
- a photocatalyst dispersion 4 was obtained. This photocatalyst dispersion 4 did not settle for solids even after storage in a dark place for 30 days, and had no problem in dispersion stability.
- Photocatalyst dispersion 5 was obtained in the same manner as in Example 18 except that the dispersion stabilizer was used and the weight of water was 90. Og. This photocatalyst dispersion liquid 5 was stored in a dark place with no dispersion stability for only one day, and the solid content completely settled.
- a yellow viscous liquid (sol solution) containing titanium was prepared.
- the prepared liquid had a pH of 6.3. Part of this sol solution is collected and dried and solidified. Next, it was fired at 600 ° C. From the weight measurement of the residue of the baked sol solution, it was proved that the yellow viscous liquid contained 2.1% by weight of titanium in terms of titanium dioxide.
- This photocatalyst coating composition 1 is turbid in pale yellow, contains 0.6% by weight of photocatalyst 1 and 0.6% by weight of titanium derived from a yellow viscous liquid in terms of acid titanium, and is a residue after baking at 600 ° C.
- the solid content concentration was 1.2% by weight.
- Two slide glasses (2.6 cm X 7.6 cm, thickness 1 mm), which had been weighed in advance, were overlapped with methanol interposed between them.
- the pair of slide glasses was dipped into and pulled out from the photocatalytic coating composition 1. Immersion and pulling were performed every 170 seconds for a total of 20 times.
- the immersion speed was 0.8 cmZ second
- the lifting speed was 0.14 cmZ second
- the immersion height was 4.6 cm out of 7.6 cm.
- photocatalyst film sample plate 1 was produced by heating at 200 ° C. for 3 hours.
- the coating film of the photocatalyst film sample plate 1 had a strength that could not be peeled off even when rubbed with a finger.
- the weight of each of the two glass slides increased by 1. Omg, 1.2 mg, respectively.
- a photoaldehyde photolysis test of the photocatalyst film sample plate 1 was conducted.
- the acetaldehyde photolysis test method is the same as the acetaldehyde photolysis test method described above.
- the initial concentration of acetaldehyde was 98 ppm, and the light irradiation time was 24 hours. Acetal after 24 hours The residual dehydride concentration was 68 ppm. It was confirmed that even when a paint containing the photocatalyst coated with a silicon oxide film according to the present invention was prepared and a photocatalyst film was prepared using the paint, it showed photodegradation activity.
- Photocatalyst coating composition 2 was obtained in the same manner as in Example 22 except that water was used instead of methanol.
- This photocatalyst coating composition 2 is light yellow and turbid, contains 0.6% by weight of photocatalyst 1 and 0.6% by weight of titanium derived from a yellow viscous liquid in terms of acid-titanium, and after firing at 600 ° C.
- the solid content concentration as a residue was 1.2% by weight.
- the photocatalyst paint composition 2 was used instead of the photocatalyst paint composition 1, and the dipping and lifting were performed every 10 minutes.
- a photocatalyst film sample plate 2 was produced.
- the coating film of the photocatalyst sample plate 2 had such a strength that it could not be peeled off even when rubbed with a finger.
- the weight of the two glass slides increased by 1.5 mg and 1.3 mg, respectively.
- a silicon wafer (2.6 cm x 7. Ocm, thickness 0.5 mm) is immersed in a resist stripper (manufactured by Kanto Chemical Co., Ltd., SH-303), washed with pure water, and irradiated with ultrasonic waves in pure water. After cleaning with pure water, the surface was cleaned by spinning at 2000 rpm in air and spin drying. This cleaned silicon wafer was placed horizontally, and 0.50 mL of the photocatalyst coating composition 2 was dropped on a 2.6 cm X 7. Ocm surface facing upward, and left to dry. Thereafter, the photocatalyst film sample plate 3 was produced by heating at 600 ° C. for 3 hours. The film of the photocatalyst film sample plate 3 had such a strength that it could not be peeled off even when rubbed with a finger. In addition, the weight of silicon wafer increased by 5.8 mg by forming a film on the surface.
- the photocatalyst dispersion 1 prepared in Example 18 was 6. Og, a yellow viscous liquid containing titanium prepared in the same manner as in Example 17 (sol solution) 14. Add 7g and 29.3g of water and stir with a magnetic stirrer for 1 hour. Thus, a photocatalytic coating composition 3 was obtained.
- This photocatalyst coating composition 3 is cloudy in pale yellow, contains 0.6% by weight of the photocatalyst, 0.6% by weight of titanium derived from a yellow viscous liquid in terms of acid-titanium, and 0.3% by weight of the dispersant.
- the solid content concentration as a residue after baking at 600 ° C. was 1.2% by weight.
- a photocatalyst film sample plate 4 was produced in the same manner as in Example 22 except that the photocatalyst paint composition 3 was used instead of the photocatalyst paint composition 1.
- the coating film of the photocatalyst film sample plate 4 had such a strength that it could not be peeled off even when rubbed with a finger.
- the two glass slides increased in weight by 0.9 mg, 1. Omg, respectively.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP06713683A EP1857181A4 (en) | 2005-02-15 | 2006-02-14 | PHOTOCATALYST, PROCESS FOR PRODUCING THE SAME, LIQUID DISPERSION CONTAINING THE PHOTOCATALYST, AND PHOTOCATALYST COATING COMPOSITION |
JP2007503661A JP4686536B2 (ja) | 2005-02-15 | 2006-02-14 | 光触媒、その製造方法、光触媒を含有する分散液および光触媒塗料組成物 |
US11/884,049 US7863215B2 (en) | 2005-02-15 | 2006-02-14 | Photocatalyst, method for producing same, liquid dispersion containing photocatalyst and photocatalyst coating composition |
CN2006800043848A CN101115559B (zh) | 2005-02-15 | 2006-02-14 | 光催化剂、其制造方法、含有光催化剂的分散液及光催化剂涂料组合物 |
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EP (1) | EP1857181A4 (ja) |
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KR (1) | KR20070102713A (ja) |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008126100A (ja) * | 2006-11-16 | 2008-06-05 | Seishichi Kishi | 光触媒物質およびその製造方法 |
JPWO2012169660A1 (ja) * | 2011-06-07 | 2015-02-23 | 株式会社ダイセル | 光触媒塗膜、及びその製造方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008126100A (ja) * | 2006-11-16 | 2008-06-05 | Seishichi Kishi | 光触媒物質およびその製造方法 |
JPWO2012169660A1 (ja) * | 2011-06-07 | 2015-02-23 | 株式会社ダイセル | 光触媒塗膜、及びその製造方法 |
JP2017221914A (ja) * | 2016-06-16 | 2017-12-21 | 株式会社フジコー | 内装材及びその製造方法 |
JP2022076646A (ja) * | 2020-11-10 | 2022-05-20 | Dic株式会社 | 金属化合物を担持した酸化チタンの水性組成物 |
JP7238877B2 (ja) | 2020-11-10 | 2023-03-14 | Dic株式会社 | 金属化合物を担持した酸化チタンの水性組成物 |
Also Published As
Publication number | Publication date |
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CN101115559B (zh) | 2011-12-28 |
CN101115559A (zh) | 2008-01-30 |
US7863215B2 (en) | 2011-01-04 |
EP1857181A1 (en) | 2007-11-21 |
KR20070102713A (ko) | 2007-10-19 |
JPWO2006088022A1 (ja) | 2008-07-03 |
EP1857181A4 (en) | 2011-06-15 |
US20090124490A1 (en) | 2009-05-14 |
TW200706247A (en) | 2007-02-16 |
JP4686536B2 (ja) | 2011-05-25 |
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