WO2016152487A1 - 可視光応答型光触媒酸化チタン微粒子分散液、その製造方法、及び光触媒薄膜を表面に有する部材 - Google Patents
可視光応答型光触媒酸化チタン微粒子分散液、その製造方法、及び光触媒薄膜を表面に有する部材 Download PDFInfo
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- WO2016152487A1 WO2016152487A1 PCT/JP2016/057047 JP2016057047W WO2016152487A1 WO 2016152487 A1 WO2016152487 A1 WO 2016152487A1 JP 2016057047 W JP2016057047 W JP 2016057047W WO 2016152487 A1 WO2016152487 A1 WO 2016152487A1
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- WIPO (PCT)
- Prior art keywords
- titanium oxide
- oxide fine
- fine particles
- visible light
- particle dispersion
- Prior art date
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- 239000006185 dispersion Substances 0.000 title claims abstract description 195
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 124
- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 396
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 377
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 76
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- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 48
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 115
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- 239000010936 titanium Substances 0.000 claims description 60
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 43
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- 239000000126 substance Substances 0.000 claims description 32
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- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
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- 239000010948 rhodium Substances 0.000 claims description 3
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- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
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- 238000006479 redox reaction Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
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- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Classifications
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
Definitions
- the present invention relates to a visible light responsive photocatalytic titanium oxide fine particle dispersion, a method for producing the same, and a member having a photocatalytic thin film formed on the surface using the dispersion, and more specifically, only visible light (400 to 800 nm).
- a visible light-responsive photocatalytic titanium oxide fine particle dispersion that can easily produce a highly transparent photocatalytic thin film that exhibits photocatalytic activity, a method for producing the same, and a photocatalytic thin film formed using the dispersion It relates to the member which has.
- Photocatalytic titanium oxide fine particles have been widely used for applications such as cleaning the surface of a substrate, deodorizing, and antibacterial.
- the photocatalytic reaction refers to a reaction caused by excited electrons and holes generated when titanium oxide absorbs light. It is thought that the decomposition of organic substances occurs mainly by the following mechanism. [1] The generated active electrons and holes react with oxygen and water adsorbed on the titanium oxide surface through an oxidation-reduction reaction, and the active species are decomposed to decompose organic substances. [2] The organic matter adsorbed on the titanium oxide surface is directly oxidized and decomposed by the generated holes.
- a method for improving the visible light activity of a photocatalyst using titanium oxide a method of supporting iron or copper on the surface of titanium oxide fine particles or titanium oxide fine particles doped with metal (for example, JP 2012-210632 A: Patent Document 2).
- JP 2010-104913 A: Patent Document 3 titanium oxide fine particles in which tin and a transition metal that enhances visible light activity are dissolved (doped), and titanium oxide fine particles in which copper is dissolved are prepared and mixed.
- the method used WO2014 / 045861: Patent Document 4 and the like are known.
- Patent Document 4 is prepared by mixing and using titanium oxide fine particles in which a transition metal for enhancing visible light activity is dissolved and titanium oxide fine particles in which copper is dissolved. Are dissolved in the titanium oxide particles, so that there is an advantage that a photocatalytic thin film that is stable and hardly denatured and has high durability can be obtained.
- JP 2009-148700 A JP 2012-210632 A JP 2010-104913 A WO2014 / 045861 JP 7-303835 A
- the present invention relates to a dispersion of visible light responsive photocatalytic titanium oxide particles capable of obtaining a different type of high visible light activity by combining and mixing titanium oxide particles in which different transition metals or the like are dissolved, and production thereof It is an object to provide a method and a member having a photocatalytic thin film formed on the surface using the dispersion.
- the inventors of the present invention have disclosed a titanium oxide fine particle in which tin, which is the first titanium oxide fine particle used in Patent Document 4, and a transition metal that enhances visible light activity are dissolved.
- tin which is the first titanium oxide fine particle used in Patent Document 4
- a transition metal that enhances visible light activity are dissolved.
- titanium oxide fine particles in which an iron component that hardly shows photocatalytic activity under only visible light conditions alone is blended as the second titanium oxide fine particles, copper is only visible under the conditions of visible light. It was found that the same high photocatalytic activity as in the case of combining titanium oxide fine particles in which the components were dissolved was shown.
- a visible light responsive photocatalytic titanium oxide fine particle dispersion containing first titanium oxide fine particles in which tin and a transition metal that enhances visible light activity are dissolved and second titanium oxide fine particles in which an iron group component is dissolved.
- the present invention provides a visible light responsive photocatalytic titanium oxide fine particle dispersion described below, a production method thereof, and a member having a photocatalytic thin film formed on the surface thereof using the dispersion.
- the first titanium oxide fine particles in which the tin component and the transition metal component that enhances the visible light responsiveness (excluding the iron group component) are dissolved, and the second oxidation in which the iron group component is dissolved are dissolved.
- a visible light responsive photocatalytic titanium oxide fine particle dispersion wherein two types of titanium oxide fine particles are dispersed together with titanium fine particles.
- the content of the molybdenum component contained in the first titanium oxide fine particles is 1 to 1,000 in terms of the molar ratio with titanium (Ti / Mo), and the content of the vanadium component is in the molar ratio with respect to titanium (Ti / V
- the content of the iron group component contained in the second titanium oxide fine particles is 1 to 1,000 in terms of a molar ratio with respect to titanium (Ti / iron group component). Visible light responsive photocatalytic titanium oxide fine particle dispersion.
- the mixing ratio of the first titanium oxide fine particles and the second titanium oxide fine particles is 99 to 0.01 in terms of mass ratio [(first titanium oxide fine particles) / (second titanium oxide fine particles)].
- the visible light responsive photocatalytic titanium oxide fine particle dispersion according to any one of [1] to [7].
- [11] A member having on its surface a photocatalytic thin film made of the visible light responsive photocatalytic titanium oxide fine particle dispersion according to any one of [1] to [10] [12] (1) a step of producing a peroxotitanic acid solution containing tin and a transition metal from a raw material titanium compound, a tin compound, a transition metal compound (excluding an iron group compound), a basic substance, hydrogen peroxide and an aqueous dispersion medium; (2) A step of heating the tin and transition metal-containing peroxotitanic acid solution produced in the step (1) at 80 to 250 ° C.
- a visible light-responsive photocatalytic titanium oxide fine particle dispersion that can easily produce a highly transparent photocatalytic thin film that exhibits photocatalytic activity only by visible light (400 to 800 nm), a method for producing the same, And the member which has the photocatalyst thin film formed using this dispersion liquid on the surface can be provided.
- the visible light responsive photocatalytic titanium oxide fine particle dispersion of the present invention is a dispersion in which first titanium oxide fine particles and second titanium oxide fine particles, which are titanium oxide fine particles having different compositions, are dispersed in an aqueous dispersion medium.
- the first titanium oxide fine particles are titanium oxide fine particles in which a tin component and a transition metal component (excluding the iron group component) are dissolved, and the second titanium oxide fine particles are oxidized in which an iron group component is dissolved. Titanium fine particles.
- a solid solution is a phase in which an atom at a lattice point of one crystal phase replaces another atom, or a phase in which another atom enters a lattice gap, that is, another substance has dissolved in a crystal phase.
- the crystal phase is a homogeneous phase.
- a substitutional solid solution is a substitution of a solvent atom at a lattice point with a solute atom, and an entry of a solute atom in a lattice gap is an interstitial solid solution.
- the titanium oxide fine particles of the present invention form a solid solution with tin and transition metal atoms (excluding the iron group component) in the first titanium oxide fine particles, and form a solid solution with the iron group component in the second titanium oxide fine particles. It is characterized by being.
- the solid solution may be a substitution type or an interstitial type.
- the substitutional solid solution is formed by substituting titanium sites of titanium oxide crystals with various metal atoms, and the interstitial solid solution is formed by entering various metal atoms in the lattice gap of titanium oxide crystals. .
- the method for dissolving the dissimilar metal in the metal oxide crystal there are no particular limitations on the method for dissolving the dissimilar metal in the metal oxide crystal, but the gas phase method (CVD method, PVD method, etc.), liquid phase method (hydrothermal method, sol-gel method, etc.), Examples thereof include a phase method (such as a high-temperature firing method).
- the crystal phase of the titanium oxide fine particles three types of rutile type, anatase type, and brookite type are generally known. However, in any of the first titanium oxide fine particles and the second titanium oxide fine particles, It is preferable to use a rutile type and an anatase type. Further, the first titanium oxide fine particles are preferably rutile type out of rutile type and anatase type, and the second titanium oxide fine particles are mainly preferably anatase type.
- the term “mainly” as used herein means that it is usually contained in an amount of 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and 100% by mass. There may be.
- an aqueous solvent is usually used as a dispersion medium of the dispersion liquid, and water is preferably used, but a mixed solvent of a hydrophilic organic solvent mixed with water at an arbitrary ratio and water may be used.
- water for example, deionized water, distilled water, pure water and the like are preferable.
- the hydrophilic organic solvent include alcohols such as methanol, ethanol and isopropanol, glycols such as ethylene glycol, glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and propylene glycol-n-propyl ether. Is preferred.
- the ratio of the hydrophilic organic solvent in the mixed solvent is preferably more than 0 and 50% by mass or less, more preferably 20% by mass or less, and further preferably 10% by mass or less. .
- the first titanium oxide fine particles are titanium oxide fine particles in which a transition metal component other than a tin component and an iron group component that enhances the visible light activity is solid-solubilized.
- a transition metal component other than a tin component and an iron group component that enhances the visible light activity examples include vanadium, chromium, although it can be selected from manganese, niobium, molybdenum, rhodium, antimony, tungsten, cerium, etc., it is preferable to select molybdenum and / or vanadium among them.
- the tin component solid-solved in the first titanium oxide fine particles is for increasing the visible light response of the photocatalytic thin film, but may be derived from a tin compound, for example, tin metal (Sn).
- the content of the tin component in the first titanium oxide fine particles is 1 to 1,000, preferably 5 to 500, more preferably 5 to 100 in terms of molar ratio with titanium (Ti / Sn). This is because when the molar ratio is less than 1, the content ratio of titanium oxide decreases and the photocatalytic effect may not be sufficiently exhibited, and when it exceeds 1,000, the visible light responsiveness may be insufficient. is there.
- the transition metal component solid-dissolved in the first titanium oxide fine particles only needs to be derived from the transition metal compound, and may be a metal, oxide, hydroxide, chloride, nitrate, sulfate, halide, Various complex compounds etc. are mentioned, These 1 type (s) or 2 or more types are used.
- the content of the transition metal component in the first titanium oxide fine particles can be appropriately selected according to the type of the transition metal component, but the molar ratio with titanium (Ti / transition metal) is in the range of 1 to 10,000, The range of 5 to 1,000 is particularly preferable.
- the molybdenum component when molybdenum is selected as the transition metal component solid-dissolved in the first titanium oxide fine particles, the molybdenum component may be derived from a molybdenum compound.
- molybdenum metal (Mo) molybdenum metal (Mo), oxide (MoO 2 , MoO 3 ), hydroxides, chlorides (MoCl 3 , MoCl 5 ), nitrates, sulfates, halides, complex compounds, etc. are used, and one or more of these are used in combination. It may be a thing.
- oxides (MoO 2 , MoO 3 ) and chlorides (MoCl 3 , MoCl 5 ) are preferably used.
- the content of the molybdenum component in the first titanium oxide fine particles is 1 to 1,000, preferably 2 to 100, more preferably 2 to 50 in terms of a molar ratio with titanium (Ti / Mo). This is because when the molar ratio is less than 1, the content ratio of titanium oxide decreases and the photocatalytic effect may not be sufficiently exhibited. When the molar ratio exceeds 1,000, the visible light responsiveness becomes insufficient, and the low concentration of acetaldehyde. This is because a high decomposition activity may not be obtained.
- vanadium component When vanadium is selected as the transition metal component solid-dissolved in the first titanium oxide fine particles, the vanadium component only needs to be derived from a vanadium compound.
- V vanadium metal
- oxide VO, V 2 O 3 , VO 2 , V 2 O 5
- hydroxide chloride (VCl 5 ), oxychloride (VOCl 3 ), nitrate, sulfate, oxysulfate (VOSO 4 ), halide, complex
- the content of the vanadium component in the first titanium oxide fine particles is 10 to 10,000, preferably 100 to 10,000, more preferably 100 to 5,000 in terms of molar ratio (Ti / V) with titanium. . This is because when the molar ratio is less than 10, the content ratio of the titanium oxide crystal is lowered and the photocatalytic effect may not be sufficiently exhibited. When it exceeds 10,000, the visible light responsiveness becomes insufficient, and the low concentration of acetaldehyde. This is because high decomposition activity may not be obtained.
- Both molybdenum and vanadium can be selected as the transition metal component dissolved in the first titanium oxide fine particles.
- the amount of each component in that case can be selected from the said range, However,
- the molar ratio [Ti / (Mo + V)] of the sum total of each component amount and titanium is one or more and less than 10,000.
- the first titanium oxide fine particles may be used alone or in combination of two or more. When two or more types having different visible light responsiveness are combined, an effect of increasing visible light activity may be obtained.
- the second titanium oxide fine particles have a composition different from that of the first titanium oxide fine particles.
- an iron group component is dissolved in a solid form.
- the iron group is similar to the first titanium oxide fine particles. It does not contain transition metals or tin other than the components.
- iron group metal dissolved in the second titanium oxide fine particles examples include iron, cobalt, and nickel, among which iron element is preferable.
- the iron group component dissolved in the second titanium oxide fine particles may be one derived from an iron group compound.
- iron metal (Fe), oxide (Fe 2 O 3 , Fe 3 O 4 ), Hydroxide (FeO (OH)), chloride (FeCl 2 , FeCl 3 ), nitrate (Fe (NO) 3 ), sulfate (FeSO 4 , Fe 2 (SO 4 ) 3 ), halide, complex A compound etc. are mentioned, You may use combining these 1 type (s) or 2 or more types.
- oxides Fe 2 O 3 , Fe 3 O 4 ), hydroxides (FeO (OH)), chlorides (FeCl 2 , FeCl 3 ), nitrates (Fe (NO) 3 ), sulfates (FeSO) 4 , Fe 2 (SO 4 ) 3 ) is preferably used.
- the content of the iron group component in the second titanium oxide fine particles is 1 to 1,000, preferably 2 to 200, more preferably 5 to 100 in terms of a molar ratio with titanium (Ti / iron group component). This is because when the molar ratio is less than 1, the content ratio of titanium oxide decreases and the photocatalytic effect may not be sufficiently exhibited, and when it exceeds 1,000, the visible light responsiveness may be insufficient. is there.
- the first titanium oxide fine particles and the second titanium oxide fine particles in the visible light responsive photocatalytic titanium oxide fine particle dispersion have a volume-based 50% cumulative distribution diameter measured by a dynamic light scattering method using laser light ( D 50 ) (hereinafter sometimes referred to as “average particle size”) is preferably 5 to 30 nm, more preferably 5 to 20 nm. This is because when the average particle size is less than 5 nm, the photocatalytic activity may be insufficient, and when it exceeds 30 nm, the dispersion may become opaque.
- Nanotrac UPA-EX150 manufactured by Nikkiso Co., Ltd.
- LA-910 manufactured by Horiba Seisakusho Co., Ltd.
- the like can be used as an apparatus for measuring the average particle size.
- the mixing ratio of the first titanium oxide fine particles and the second titanium oxide fine particles contained in the visible light responsive photocatalytic titanium oxide fine particle dispersion is the mass ratio [(first titanium oxide fine particles) / (second oxidation Titanium fine particles)] is preferably 99 to 0.01, more preferably 19 to 0.05, and still more preferably 9 to 1. This is because when the mass ratio is more than 99 or less than 0.01, visible light activity may be insufficient.
- the total concentration of the first titanium oxide fine particles and the second titanium oxide fine particles in the visible light responsive photocatalytic titanium oxide fine particle dispersion is 0.01 from the viewpoint of easy production of a photocatalytic thin film having a required thickness. Is preferably 20 to 20% by mass, particularly preferably 0.5 to 10% by mass.
- a binder may be added to the visible light responsive photocatalytic titanium oxide fine particle dispersion for the purpose of facilitating the application of the dispersion to the surfaces of various members described later and the adhesion of the fine particles.
- the binder include metal compound binders such as silicon, aluminum, titanium, and zirconium, and organic resin binders such as fluorine resin, acrylic resin, and urethane resin.
- the mass ratio of the binder to titanium oxide [binder / titanium oxide] is 0.01 to 99, more preferably 0.1 to 9, and still more preferably 0.4 to 2.5. Is preferred. This is because when the mass ratio is less than 0.01, the adhesion of the titanium oxide fine particles to the surfaces of various members becomes insufficient, and when it exceeds 99, the visible light activity may be insufficient.
- the compounding ratio of silicon compound binder is 1:99 to 99: 1, more preferably 10: It is preferable to add and use within the range of 90 to 90:10, more preferably 30:70 to 70:30.
- the silicon compound binder is a colloidal dispersion, solution or emulsion of a silicon compound containing a solid or liquid silicon compound in an aqueous dispersion medium, specifically, colloidal silica.
- Silicate solution such as silicate; Silane, siloxane hydrolyzate emulsion; Silicone resin emulsion; Silicone resin such as silicone-acrylic resin copolymer, silicone-urethane resin copolymer and others And emulsions of copolymers with these resins.
- the method for producing a visible light responsive photocatalytic titanium oxide fine particle dispersion comprises producing a first titanium oxide fine particle dispersion and a second titanium oxide fine particle dispersion, respectively, It is prepared by mixing with the second titanium oxide fine particle dispersion.
- a production method having the following steps (1) to (5) can be mentioned.
- Steps (1) to (2) are steps for obtaining a first titanium oxide fine particle dispersion
- steps (3) to (4) are steps for obtaining a second titanium oxide fine particle dispersion
- (5 ) Is a step of finally obtaining a dispersion containing the first titanium oxide fine particles and the second titanium oxide fine particles.
- each step will be described in detail below on the premise thereof.
- step (1) a transition metal and tin-containing peroxotitanic acid solution is produced by reacting a raw material titanium compound, a transition metal compound, a tin compound, a basic substance, and hydrogen peroxide in an aqueous dispersion medium.
- a basic substance is added to the raw material titanium compound in the aqueous dispersion medium to form titanium hydroxide, impurity ions other than the contained metal ions are removed, and hydrogen peroxide is added to form peroxotitanic acid.
- the transition metal compound and tin compound are added to the transition metal and tin-containing peroxotitanic acid later, and the transition metal compound and tin compound are added to the raw material titanium compound and basic substance in the aqueous dispersion medium.
- the transition metal and tin-containing titanium hydroxide may be used, impurity ions other than the metal ions contained may be removed, and hydrogen peroxide may be added to obtain the transition metal and tin-containing peroxotitanic acid.
- the raw material titanium compound and the basic substance in the aqueous dispersion medium are dispersed in two liquids, like an aqueous dispersion medium in which the raw material titanium compound is dispersed and an aqueous dispersion medium in which the basic substance is dispersed. According to the solubility of each compound of the transition metal compound and tin compound in the two liquids, the respective compounds are dissolved in either one or both of the two liquids and then mixed together. Good.
- transition metal and tin-containing peroxotitanic acid After obtaining the transition metal and tin-containing peroxotitanic acid in this way, it is subjected to a hydrothermal reaction in the step (2) described later, whereby titanium oxide fine particles in which the various metals are dissolved in titanium oxide can be obtained.
- titanium compound for example, inorganic acid salts such as titanium chloride, nitrate and sulfate, organic acid salts such as formic acid, citric acid, oxalic acid, lactic acid and glycolic acid, and alkalis are added to these aqueous solutions And titanium hydroxide deposited by hydrolysis, and one or two or more of these may be used in combination.
- inorganic acid salts such as titanium chloride, nitrate and sulfate
- organic acid salts such as formic acid, citric acid, oxalic acid, lactic acid and glycolic acid, and alkalis
- titanium hydroxide deposited by hydrolysis and one or two or more of these may be used in combination.
- titanium chloride TiCl 3 , TiCl 4
- the transition metal compound, the tin compound, and the aqueous dispersion medium those described above are used so as to have the above-described composition.
- concentration of the raw material titanium compound aqueous solution formed from a raw material titanium compound and an aqueous dispersion medium is 60 mass% or less, especially 30 mass% or less.
- concentration is selected suitably, it is preferable that it is 1 mass% or more normally.
- the basic substance is for making the raw material titanium compound into titanium hydroxide smoothly.
- hydroxide of alkali metal or alkaline earth metal such as sodium hydroxide or potassium hydroxide, ammonia, alkanolamine, alkyl
- An amine compound such as an amine can be used, and the raw material titanium compound aqueous solution is added and used in such an amount that the pH becomes 7 or more, particularly pH 7-10.
- the basic substance may be used in the form of an aqueous solution having an appropriate concentration together with the aqueous dispersion medium.
- Hydrogen peroxide is used to convert the above raw material titanium compound or titanium hydroxide into peroxotitanium, that is, a titanium oxide compound containing a Ti—O—O—Ti bond, and is usually used in the form of hydrogen peroxide water. Is done.
- the amount of hydrogen peroxide added is preferably 1.5 to 20 times the total number of moles of transition metal, V and Sn.
- the reaction temperature is preferably 5 to 80 ° C., and the reaction time is 30 minutes to 24 hours. preferable.
- the peroxotitanic acid solution containing the transition metal and tin thus obtained may contain an alkaline substance or an acidic substance for pH adjustment and the like.
- the alkaline substance herein include ammonia, sodium hydroxide, and calcium hydroxide.
- the acidic substance include inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, carbonic acid, phosphoric acid, and hydrogen peroxide. And organic acids such as formic acid, citric acid, succinic acid, lactic acid and glycolic acid.
- the pH of the obtained peroxotitanic acid solution containing transition metal and tin is preferably 1 to 9, particularly 4 to 7 in view of safety in handling.
- the transition metal and tin-containing peroxotitanic acid solution obtained in the above step (1) is added at a temperature of 80 to 250 ° C., preferably 100 to 250 ° C. under a pressure control.
- the reaction temperature is suitably from 80 to 250 ° C. from the viewpoint of reaction efficiency and reaction controllability, and as a result, the transition metal and tin-containing peroxotitanic acid are converted into transition metal and tin-containing titanium oxide fine particles.
- under pressure control means that when the reaction temperature exceeds the boiling point of the dispersion medium, the reaction temperature is appropriately maintained to maintain the reaction temperature so that the reaction temperature can be maintained.
- the pressure used here is usually about 0.12 to 4.5 MPa, preferably about 0.15 to 4.5 MPa, more preferably 0.20 to 4.5 MPa.
- the reaction time is preferably 1 minute to 24 hours.
- the particle diameter of the titanium oxide fine particles obtained here is preferably in the range as already described, but the particle diameter can be controlled by adjusting the reaction conditions, for example, shortening the reaction time. Thus, the particle diameter can be reduced.
- step (3) in addition to the above steps (1) and (2), the raw material titanium compound, iron group compound, basic substance and hydrogen peroxide are reacted in an aqueous dispersion medium, thereby containing an iron group element.
- a peroxotitanic acid solution is prepared. As a reaction method, it can replace with the transition metal compound and tin compound in the said process (1), and it can carry out by the completely same method except using an iron group compound.
- the starting titanium compound, the iron group compound, the aqueous dispersion medium, the basic substance, and the hydrogen peroxide as the starting materials are used in such a manner that the above-mentioned ones are blended as described above, and the temperature and time described above are used. Under the reaction.
- the iron group element-containing peroxotitanic acid solution thus obtained may also contain an alkaline substance or an acidic substance for pH adjustment, etc., and the alkaline substance and acidic substance, and the pH adjustment here are handled in the same manner as described above. be able to.
- the iron group element-containing peroxotitanic acid solution obtained in the above step (3) is subjected to pressure control at a temperature of 80 to 250 ° C., preferably 100 to 250 ° C. for 0.01 to 24 hours.
- the reaction temperature is suitably 80 to 250 ° C. from the viewpoint of reaction efficiency and reaction control.
- iron group element-containing peroxotitanic acid is converted into iron group element-containing titanium oxide fine particles.
- under pressure control means that when the reaction temperature exceeds the boiling point of the dispersion medium, the reaction temperature is appropriately maintained to maintain the reaction temperature so that the reaction temperature can be maintained.
- the pressure used here is usually about 0.12 to 4.5 MPa, preferably about 0.15 to 4.5 MPa, more preferably 0.20 to 4.5 MPa.
- the reaction time is preferably 1 minute to 24 hours.
- the particle diameter of the titanium oxide fine particles obtained here is preferably in the range as already described, but the particle diameter can be controlled by adjusting the reaction conditions, for example, shortening the reaction time. Thus, the particle diameter can be reduced.
- step (5) the first titanium oxide fine particle dispersion obtained in steps (1) and (2) is mixed with the second titanium oxide fine particle dispersion obtained in steps (3) and (4).
- the mixing method is not particularly limited, and may be a method of stirring with a stirrer or a method of dispersing with an ultrasonic disperser.
- the mixing temperature is preferably 20 to 100 ° C., and the time is preferably 1 minute to 3 hours.
- mixing ratio mixing may be performed so that the mass ratio of the titanium oxide fine particles in each titanium oxide fine particle dispersion becomes the mass ratio as described above.
- the mass of the titanium oxide fine particles contained in the titanium oxide fine particle dispersion can be calculated from the amount and concentration of the titanium oxide fine particle dispersion.
- the total concentration of the first titanium oxide fine particles and the second titanium oxide fine particles in the visible light responsive photocatalytic titanium oxide fine particle dispersion prepared in this manner is easy to produce a photocatalytic thin film having a required thickness as described above.
- 0.01 to 20% by mass is preferable, and 0.5 to 10% by mass is particularly preferable.
- concentration adjustment when the concentration is higher than the desired concentration, the concentration can be lowered by adding and diluting the aqueous solvent. When the concentration is lower than the desired concentration, the aqueous solvent is volatilized or filtered off. The concentration can be increased. The concentration can be calculated as described above.
- the visible light responsive photocatalytic titanium oxide fine particle dispersion in which the concentration is adjusted as described above so that a desired concentration is obtained after mixing the aqueous binder solution to be added. It is preferable to add to the liquid.
- the visible light responsive photocatalytic titanium oxide fine particle dispersion of the present invention can be used for forming a photocatalytic film on the surface of various members.
- various members are not particularly limited, but examples of the material of the members include organic materials and inorganic materials. These can have various shapes according to their respective purposes and applications.
- organic materials examples include vinyl chloride resin (PVC), polyethylene (PE), polypropylene (PP), polycarbonate (PC), acrylic resin, polyacetal, fluororesin, silicone resin, and ethylene-vinyl acetate copolymer (EVA).
- PVC vinyl chloride resin
- PE polyethylene
- PP polypropylene
- PC polycarbonate
- acrylic resin acrylic resin
- polyacetal polyacetal
- fluororesin silicone resin
- silicone resin ethylene-vinyl acetate copolymer
- EVA ethylene-vinyl acetate copolymer
- NBR Acrylonitrile-butadiene rubber
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PVB polyvinyl butyral
- EVOH ethylene-vinyl alcohol copolymer
- PPS polyphenylene sulfide
- PEI polyether Imide
- PEEI polyetheretherimide
- PEEK polyetheretherketone
- ABS acrylonitrile-butadiene-styrene
- Synthetic resin material such, natural materials such as natural rubber, or semi-synthetic materials include the above-mentioned synthetic resin material and natural material. These may be commercialized into a required shape and configuration such as a film, a sheet, a fiber material, a fiber product, other molded products, and a laminate.
- inorganic materials include non-metallic inorganic materials and metallic inorganic materials.
- non-metallic inorganic materials include glass, ceramics, and stone materials. These may be commercialized in various forms such as tiles, glass, mirrors, walls, and design materials.
- the metal inorganic material include cast iron, steel, iron, iron alloy, aluminum, aluminum alloy, nickel, nickel alloy, and zinc die cast. These may be plated with the metal inorganic material, may be coated with the organic material, or may be plated on the surface of the organic material or non-metallic inorganic material.
- the visible light responsive photocatalytic titanium oxide fine particle dispersion of the present invention is particularly useful for producing a transparent photocatalytic thin film on a polymer film such as PET among the above-mentioned various members.
- a visible light responsive photocatalytic titanium oxide fine particle dispersion is applied to the surface of the member by, for example, a known coating method such as spray coating or dip coating, and then a far infrared ray.
- a drying method such as spray coating or dip coating
- a far infrared ray What is necessary is just to dry by well-known drying methods, such as drying, IH drying, hot air drying, and the thickness of a photocatalyst film
- membrane can also be selected variously, However, Usually, the range of 10 nm-10 micrometers is preferable.
- the photocatalyst film thus formed is transparent and not only provides a good photocatalytic action in the ultraviolet region (10 to 400 nm) as in the prior art, but also provides a sufficient photocatalytic action with the conventional photocatalyst.
- Excellent photocatalytic action can be obtained with only visible light (400 to 800 nm) that could not be produced, and various members formed with the photocatalytic film decompose organic substances adsorbed on the surface by the photocatalytic action of titanium oxide. Therefore, effects such as cleaning, deodorization, and antibacterial of the surface of the member can be exhibited.
- Average particle diameter of fine titanium oxide particles in the dispersion (D 50 ) The average particle diameter (D 50 ) of the titanium oxide fine particles in the dispersion was measured using a particle size distribution analyzer (trade name “Nanotrack particle size analyzer UPA-EX150”, Nikkiso Co., Ltd.).
- Acetaldehyde gas decomposition performance test of photocatalytic thin film (under LED irradiation) The activity of the photocatalyst thin film produced by applying and drying the dispersion was evaluated by the decomposition reaction of acetaldehyde gas. The evaluation was performed by a batch type gas decomposition performance evaluation method. Specifically, an evaluation sample in which a photocatalyst thin film containing about 50 mg of photocatalyst fine particles as a dry mass is formed on the entire surface of an A4 size (210 mm ⁇ 297 mm) PET film in a stainless steel cell with a quartz glass window having a volume of 5 L.
- A4 size 210 mm ⁇ 297 mm
- the cell was filled with acetaldehyde gas having a concentration of 5 ppm adjusted to a humidity of 50%, and an LED (product model number “TH-211 ⁇ 200SW”, CCS Co., Ltd., spectral distribution: 400)
- the light was irradiated so that the illuminance was 30,000 Lx at ⁇ 800 nm.
- concentration of acetaldehyde gas in the cell decreases. Therefore, the amount of acetaldehyde gas decomposition can be determined by measuring the concentration.
- the acetaldehyde gas concentration is measured using a photoacoustic multi-gas monitor (trade name “INNOVA1412”, manufactured by LumaSense), and the acetaldehyde gas concentration is reduced from the initial 5 ppm to [1] 1 ppm and [2] 0.03 ppm.
- the time required for was compared and evaluated according to the following criteria. The test was conducted for up to 20 hours.
- the crystal phase of titanium oxide fine particles was obtained by drying the obtained dispersion of titanium oxide fine particles at 105 ° C. for 3 hours, and collecting powder X-ray diffraction of titanium oxide fine particle powder (product) The name “desktop X-ray diffractometer D2 PHASER”, Bruker AXS Co., Ltd.) was measured for measurement.
- Example 1 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved> After adding and dissolving tin (IV) chloride in a 36 mass% titanium chloride (IV) aqueous solution so that the Ti / Sn (molar ratio) is 20, this was diluted 10 times with pure water, Then, 10% by mass of ammonia water in which molybdenum oxide (VI) was added and dissolved so that Ti / Mo (molar ratio) was 20 with respect to the Ti component in the titanium chloride (IV) aqueous solution was gradually added. By neutralization and hydrolysis, a precipitate of titanium hydroxide containing tin and molybdenum was obtained.
- the pH of the solution at this time was 8.
- the obtained precipitate was deionized by repeatedly adding pure water and decanting. After this deionization treatment, 35 mass% hydrogen peroxide water is added to the titanium hydroxide precipitate containing tin and molybdenum so that H 2 O 2 / (Ti + Sn + Mo) (molar ratio) becomes 10, and then 50% The mixture was sufficiently reacted by stirring at 3 ° C. for 3 hours to obtain an orange transparent tin and molybdenum-containing peroxotitanic acid solution (a).
- a titanium oxide fine particle dispersion (E-1) was obtained.
- Photocatalytic titanium oxide fine particle dispersion (E-1) and silica-based binder (Colloidal silica, trade name: Snowtex 20, manufactured by Nissan Chemical Industries, Ltd., average particle size 10-20 nm, SiO 2 concentration 20 mass% aqueous solution) was added so that the TiO 2 / SiO 2 (mass ratio) would be 1.5 to prepare a coating solution for evaluation.
- acetaldehyde gas decomposition performance of this photocatalyst thin film was measured by a batch-type gas decomposition performance evaluation method, it was 1 ppm (very good: 2.5) 2.5 hours after irradiation with an LED (wavelength 400 to 800 nm), and 0 after 6.1 hours. The acetaldehyde gas concentration decreased to 0.03 ppm (very good:)).
- Example 2 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved>
- molybdenum oxide (VI) was added so that the Ti / Mo (molar ratio) was 3.3, and the hydrothermal treatment time was 120 minutes, the tin and molybdenum were solid.
- a dispersion of dissolved titanium oxide fine particles (C) (solid content concentration 1 mass%) was obtained.
- a titanium oxide fine particle dispersion (E-2) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-2), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 0.03 ppm (very good: ⁇ ) at 4.1 ppm (very good:)) in 4.1 hours.
- Example 3 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved> A dispersion of fine titanium oxide particles (D) in which tin and molybdenum are dissolved in the same manner as in Example 1 except that molybdenum oxide (VI) is added so that the Ti / Mo (molar ratio) is 100. Solid content concentration 1% by mass) was obtained. When the powder X-ray diffraction measurement of the titanium oxide fine particles (D) was performed, the observed peak was only that of rutile type titanium oxide, and it was found that tin and molybdenum were dissolved in titanium oxide.
- a titanium oxide fine particle dispersion (E-3) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-3), and the acetaldehyde gas decomposition performance was measured.
- the concentration of acetaldehyde gas decreased to 1 ppm (good: ⁇ ) and to 0.03 ppm (good: ⁇ ) in 19.0 hours.
- Example 4 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved>
- the titanium (IV) chloride aqueous solution was added so that the Ti / Sn (molar ratio) was 5, and the hydrothermal treatment temperature was 180 ° C.
- tin and molybdenum were dissolved.
- a dispersion (solid content concentration 1% by mass) of the titanium oxide fine particles (E) thus obtained was obtained.
- the powder X-ray diffraction measurement of the titanium oxide fine particles (E) was performed, the observed peak was only that of rutile type titanium oxide, and it was found that tin and molybdenum were dissolved in titanium oxide.
- a titanium oxide fine particle dispersion (E-4) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-4), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and 0.03 ppm (very good: ⁇ ) in 7.6 hours.
- Example 5 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved>
- the titanium (IV) chloride aqueous solution was added so that the Ti / Sn (molar ratio) was 33, and the hydrothermal treatment temperature was 140 ° C., tin and molybdenum were dissolved.
- a dispersion (solid content concentration 1% by mass) of the titanium oxide fine particles (F) thus obtained was obtained.
- a titanium oxide fine particle dispersion (E-5) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-5), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and 0.03 ppm (good:)) in 12.5 hours.
- Example 6 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and molybdenum are dissolved> Dispersion of fine particles of titanium oxide (G) in which tin and molybdenum were dissolved, in the same manner as in Example 1 except that molybdenum oxide (VI) was added so that the Ti / Mo (molar ratio) was 12.5. A liquid (solid content concentration 1 mass%) was obtained.
- the powder X-ray diffraction measurement of the titanium oxide fine particles (G) was performed, the observed peak was only that of rutile type titanium oxide, and it was found that tin and molybdenum were dissolved in titanium oxide.
- a titanium oxide fine particle dispersion (E-6) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-6), and the acetaldehyde gas decomposition performance was measured.
- the concentration of acetaldehyde gas decreased to 1 ppm (very good:)) and to 0.03 ppm (good:)) in 19.8 hours.
- a titanium oxide fine particle dispersion (E-7) was obtained.
- Example 2 an evaluation coating solution and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-7), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and 0.03 ppm (very good: ⁇ ) in 7.8 hours.
- a titanium oxide fine particle dispersion (E-8) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-8), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and to 0.03 ppm (good: ⁇ ) in 15.3 hours.
- Example 9 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and vanadium are dissolved> Add and dissolve tin chloride (IV) in a 36 mass% titanium chloride (IV) solution so that Ti / Sn (molar ratio) is 20 and vanadyl sulfate (IV) is Ti / V (molar ratio) is 2000. This was diluted 10-fold with pure water, and then 10% by mass of ammonia water was gradually added to neutralize and hydrolyze to obtain a precipitate of titanium hydroxide containing tin and vanadium. The pH of the solution at this time was 8.5. The obtained precipitate was deionized by repeatedly adding pure water and decanting.
- a titanium oxide fine particle dispersion (E-9) was obtained.
- Example 2 an evaluation coating solution and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-9), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and 0.03 ppm (good: :) in 13.8 hours.
- Example 10 ⁇ Preparation of titanium oxide fine particle dispersion in which tin and vanadium are dissolved>
- vanadyl sulfate (IV) was added so that the Ti / V (molar ratio) was 500, the hydrothermal treatment temperature was 180 ° C., and the hydrothermal treatment time was 20 minutes.
- fine-particles (J) in which vanadium was dissolved was obtained.
- the powder X-ray diffraction measurement of the titanium oxide fine particles (J) was performed, the observed peak was only that of rutile type titanium oxide, and it was found that tin and vanadium were dissolved in titanium oxide.
- a titanium oxide fine particle dispersion (E-10) was obtained.
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-10), and the acetaldehyde gas decomposition performance was measured.
- the concentration of acetaldehyde gas decreased to 1 ppm (very good:)) and to 0.03 ppm (good:)) in 14.6 hours.
- a visible light responsive photocatalytic titanium oxide fine particle dispersion (E-11) of the present invention was obtained.
- Example 2 an evaluation coating solution and a photocatalytic thin film were prepared from the photocatalytic titanium oxide fine particle dispersion (E-11), and acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to 1 ppm (very good:)) and 0.03 ppm (very good:)) in 3.5 hours.
- a titanium oxide fine particle dispersion (C-1) was obtained only from the dispersion of titanium oxide fine particles (A).
- Example 2 a coating solution for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-1), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to (slightly poor: ⁇ ).
- a titanium oxide fine particle dispersion (C-2) was obtained only from the dispersion of the titanium oxide fine particles (B).
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-2), and the acetaldehyde gas decomposition performance was measured. A decrease in acetaldehyde gas concentration was not observed (poor: x).
- a titanium oxide fine particle dispersion (C-3) was obtained only from the dispersion of titanium oxide fine particles (K).
- Example 2 a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-3), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to (slightly poor: ⁇ ).
- Example 2 a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-4) and measured for acetaldehyde gas decomposition performance.
- the acetaldehyde gas concentration decreased to (very good: ⁇ )
- the acetaldehyde gas concentration decreased only to 0.16 ppm (somewhat poor: ⁇ ) in 20 hours.
- Example 2 a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-5), and the acetaldehyde gas decomposition performance was measured. As a result, 1 ppm after 6.8 hours after LED irradiation. Although the acetaldehyde gas concentration decreased to (very good: ⁇ ), the acetaldehyde gas concentration decreased only to 0.20 ppm (somewhat poor: ⁇ ) in 20 hours.
- Example 1 a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-6), and the acetaldehyde gas decomposition performance was measured. As a result, 1 ppm after 6.0 hours after LED irradiation. Although the acetaldehyde gas concentration decreased to (very good: ⁇ ), the acetaldehyde gas concentration decreased only to 0.13 ppm (somewhat poor: ⁇ ) in 20 hours.
- the titanium oxide fine particles dispersion (C ⁇ 7) was obtained.
- Example 1 a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-7), and the acetaldehyde gas decomposition performance was measured. As a result, 1 ppm after 18.6 hours after LED irradiation. Although the acetaldehyde gas concentration decreased to (good: ⁇ ), the acetaldehyde gas concentration decreased only to 0.80 ppm (somewhat poor: ⁇ ) in 20 hours.
- Molybdenum-containing peroxotitanic acid solution (m) 400 mL was charged into an autoclave having a volume of 500 mL, hydrothermally treated for 120 minutes at 130 ° C., and then pure water was added to adjust the concentration. A dispersion of solid-dissolved titanium oxide fine particles (M) (solid content concentration 1 mass%) was obtained. When the powder X-ray diffraction measurement of the titanium oxide fine particles (M) was performed, the observed peak was only that of anatase type titanium oxide, and it was found that molybdenum was dissolved in titanium oxide.
- the titanium oxide fine particle dispersion (C ⁇ 8) was obtained.
- Example 2 an evaluation coating solution and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-8), and the acetaldehyde gas decomposition performance was measured.
- the acetaldehyde gas concentration decreased to (slightly poor: ⁇ ).
- a titanium oxide fine particle dispersion (C-9) was obtained only from the dispersion of titanium oxide fine particles (N).
- Example 2 an evaluation coating liquid and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-9), and the acetaldehyde gas decomposition performance was measured. A decrease in acetaldehyde gas concentration was not observed (poor: x).
- Example 2 Thereafter, as in Example 1, a coating liquid for evaluation and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-10), and the acetaldehyde gas decomposition performance was measured. As a result, 4.0 ppm after 20 hours of LED irradiation. The acetaldehyde gas concentration decreased to (slightly poor: ⁇ ).
- Example 2 In the same manner as in Example 1, an evaluation coating solution and a photocatalytic thin film were prepared from the titanium oxide fine particle dispersion (C-11), and the acetaldehyde gas decomposition performance was measured. Although the acetaldehyde gas concentration decreased to (very good: ⁇ ), the acetaldehyde gas concentration decreased only to 0.09 ppm (somewhat poor: ⁇ ) in 20 hours.
- Table 1 summarizes the raw material ratio, hydrothermal treatment conditions, and average particle diameter (D 50 ) of the titanium oxide fine particles used in Examples 1 to 11 and Comparative Examples 1 to 12.
- Table 2 summarizes the mixing ratio, average particle diameter, and acetaldehyde gas decomposition test results of the visible light responsive photocatalyst fine particle dispersions of Examples 1 to 11 and Comparative Examples 1 to 12.
- the first titanium oxide fine particles in which the tin component and the transition metal component (molybdenum component and / or vanadium component) that enhances the visible light responsiveness are dissolved, and the iron component is the solid component.
- the decomposition of acetaldehyde gas is improved even under LED irradiation that emits only light in the visible region, and the indoor air chemicals formulated by the Ministry of Health, Labor and Welfare
- the acetaldehyde gas concentration is reduced to within 0.03 ppm, which is the indoor concentration guideline value (acetaldehyde), within an effective time, for example, within 20 hours, preferably within 10 hours, and more preferably within 5 hours. be able to.
- the second titanium oxide fine particles are indispensable for improving the visible light activity, and the iron component dissolved in the dispersion without being dissolved in the second titanium oxide fine particles. Does not contribute to activity improvement. That is, the main factor of the visible light activity improvement effect is not the iron component that leaks from the second titanium oxide fine particles, but the second titanium oxide fine particles in which iron is dissolved, tin, and the transition metal component that enhances the visible light response. This is due to the combination of the first titanium oxide fine particles in which is dissolved.
- the dissolved iron component contributes to the visible light activity improvement to some extent, but sufficient visible light activity for low concentration acetaldehyde gas cannot be obtained.
- the dissolved iron component when added in a large amount, there is a possibility of causing aggregation and precipitation of titanium oxide fine particles in the dispersion.
- the visible light responsive photocatalyst fine particle dispersion of the present invention is applied to various substrates made of an inorganic substance such as glass and metal, and an organic substance such as a polymer film (PET film or the like) to produce a photocatalytic thin film.
- an inorganic substance such as glass and metal
- an organic substance such as a polymer film (PET film or the like)
- PET film polymer film
- it is useful for producing a transparent photocatalytic thin film on a polymer film.
Abstract
Description
〔1〕
水性分散媒中に、スズ成分及び可視光応答性を高める遷移金属成分(但し鉄族成分を除く)が固溶された第1の酸化チタン微粒子と鉄族成分が固溶された第2の酸化チタン微粒子との2種類の酸化チタン微粒子が分散されていることを特徴とする可視光応答型光触媒酸化チタン微粒子分散液。
〔2〕
第1の酸化チタン微粒子に含有されるスズ成分の含有量がチタンとのモル比(Ti/Sn)で1~1,000である〔1〕に記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔3〕
第1の酸化チタン微粒子に固溶される遷移金属成分が、バナジウム、クロム、マンガン、ニオブ、モリブデン、ロジウム、アンチモン、タングステン、セリウムから選ばれる少なくとも1つである〔1〕又は〔2〕に記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔4〕
第1の酸化チタン微粒子に固溶される遷移金属成分が、モリブデン及びバナジウムから選ばれる少なくとも1つである〔1〕又は〔2〕に記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔5〕
第1の酸化チタン微粒子に含有されるモリブデン成分の含有量がチタンとのモル比(Ti/Mo)で1~1,000であり、バナジウム成分の含有量がチタンとのモル比(Ti/V)で10~10,000である〔4〕に記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔6〕
第2の酸化チタン微粒子に含有される鉄族成分の含有量がチタンとのモル比(Ti/鉄族成分)で1~1,000である〔1〕~〔5〕のいずれかに記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔7〕
第2の酸化チタン微粒子に固溶された鉄族成分が、鉄成分である〔1〕~〔6〕のいずれかに記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔8〕
第1の酸化チタン微粒子と第2の酸化チタン微粒子の混合比が、それぞれの質量比[(第1の酸化チタン微粒子)/(第2の酸化チタン微粒子)]で99~0.01である〔1〕~〔7〕のいずれかに記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔9〕
更に、バインダーを含有する〔1〕~〔8〕のいずれかに記載の可視光応答型光触媒酸化チタン分散液。
〔10〕
バインダーがケイ素化合物系バインダーである〔9〕に記載の可視光応答型光触媒酸化チタン微粒子分散液。
〔11〕
〔1〕~〔10〕のいずれかに記載の可視光応答型光触媒酸化チタン微粒子分散液による光触媒薄膜を表面に有する部材。
〔12〕
(1)原料チタン化合物、スズ化合物、遷移金属化合物(但し鉄族化合物を除く)、塩基性物質、過酸化水素及び水性分散媒から、スズ及び遷移金属含有ペルオキソチタン酸溶液を製造する工程、
(2)上記(1)の工程で製造したスズ及び遷移金属含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、スズ及び遷移金属含有酸化チタン微粒子分散液を得る工程、
(3)原料チタン化合物、鉄族化合物、塩基性物質、過酸化水素及び水性分散媒から、鉄族元素含有ペルオキソチタン酸溶液を製造する工程、
(4)上記(3)の工程で製造した鉄族元素含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、鉄族元素含有酸化チタン微粒子分散液を得る工程、
(5)上記(2)、(4)の工程で製造した2種類の酸化チタン微粒子分散液を混合する工程
を有することを特徴とする可視光応答型光触媒酸化チタン微粒子分散液の製造方法。
本発明の可視光応答型光触媒酸化チタン微粒子分散液は、水性分散媒中に、組成の異なる酸化チタン微粒子である第1の酸化チタン微粒子と第2の酸化チタン微粒子とが分散されているものであり、第1の酸化チタン微粒子はスズ成分と遷移金属成分(但し鉄族成分を除く)が固溶された酸化チタン微粒子であり、第2の酸化チタン微粒子は鉄族成分が固溶された酸化チタン微粒子である。
本発明の可視光応答型光触媒酸化チタン微粒子分散液の製造方法は、第1の酸化チタン微粒子分散液と第2の酸化チタン微粒子分散液とをそれぞれ製造し、第1の酸化チタン微粒子分散液と第2の酸化チタン微粒子分散液とを混合することにより調製される。
(1)原料チタン化合物、スズ化合物、遷移金属化合物(但し鉄族化合物を除く)、塩基性物質、過酸化水素及び水性分散媒から、スズ及び遷移金属含有ペルオキソチタン酸溶液を製造する工程、
(2)上記(1)の工程で製造したスズ及び遷移金属含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、スズ及び遷移金属含有酸化チタン微粒子分散液を得る工程、
(3)原料チタン化合物、鉄族化合物、塩基性物質、過酸化水素及び水性分散媒から、鉄族元素含有ペルオキソチタン酸溶液を製造する工程、
(4)上記(3)の工程で製造した鉄族元素含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、鉄族元素含有酸化チタン微粒子分散液を得る工程、
(5)上記(2)、(4)の工程で製造した2種類の酸化チタン微粒子分散液を混合する工程。
また、既に述べたように、工程(1)で用いられる遷移金属化合物としては、モリブデン化合物及び/又はバナジウム化合物を用いることが好ましいので、以下その前提で各工程について詳細に説明する。
工程(1)では、原料チタン化合物、遷移金属化合物、スズ化合物、塩基性物質及び過酸化水素を水性分散媒中で反応させることにより、遷移金属及びスズ含有ペルオキソチタン酸溶液を製造する。
なお、後者の前段において、水性分散媒中の原料チタン化合物及び塩基性物質を、原料チタン化合物を分散させた水性分散媒と塩基性物質を分散させた水性分散媒のように2液の水性分散媒に分けて、遷移金属化合物及びスズ化合物のそれぞれの化合物の当該2液への溶解性に従って、それぞれの化合物を当該2液のいずれか一方又は両方へ溶解させた後に、両者を混合してもよい。
工程(2)では、上記工程(1)で得られた遷移金属及びスズ含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃、好ましくは100~250℃の温度において0.01~24時間水熱反応に供する。反応温度は、反応効率と反応の制御性の観点から80~250℃が適切であり、その結果、遷移金属及びスズ含有ペルオキソチタン酸は、遷移金属及びスズ含有酸化チタン微粒子に変換されていく。なお、ここで圧力制御の下とは、反応温度が分散媒の沸点を超える場合には、反応温度が維持できるように、適宜加圧を行い、反応温度を維持することをいい、分散媒の沸点以下の温度とする場合に大気圧で制御する場合を含む。ここで用いる圧力は、通常0.12~4.5MPa程度、好ましくは0.15~4.5MPa程度、より好ましくは0.20~4.5MPaである。反応時間は、1分~24時間であることが好ましい。この工程(2)により、第1の酸化チタン微粒子である遷移金属及びスズ含有酸化チタン微粒子分散液が得られる。
工程(3)では、上記(1)~(2)の工程とは別に、原料チタン化合物、鉄族化合物、塩基性物質及び過酸化水素を水性分散媒中で反応させることにより、鉄族元素含有ペルオキソチタン酸溶液を製造する。反応方法としては、上記工程(1)における遷移金属化合物及びスズ化合物に代えて、鉄族化合物を使用する以外は全く同様の方法で行うことができる。
工程(4)では、上記工程(3)で得られた鉄族元素含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃、好ましくは100~250℃の温度において0.01~24時間水熱反応に供する。反応温度は、反応効率と反応の制御性の観点から80~250℃が適切であり、その結果、鉄族元素含有ペルオキソチタン酸は、鉄族元素含有酸化チタン微粒子に変換されていく。なお、ここで圧力制御の下とは、反応温度が分散媒の沸点を超える場合には、反応温度が維持できるように、適宜加圧を行い、反応温度を維持することをいい、分散媒の沸点以下の温度とする場合に大気圧で制御する場合を含む。ここで用いる圧力は、通常0.12~4.5MPa程度、好ましくは0.15~4.5MPa程度、より好ましくは0.20~4.5MPaである。反応時間は、1分~24時間であることが好ましい。この工程(4)により、第2の酸化チタン微粒子である鉄族元素含有酸化チタン微粒子分散液が得られる。
工程(5)では、工程(1)~(2)で得られた第1の酸化チタン微粒子分散液と工程(3)~(4)で得られた第2の酸化チタン微粒子分散液とを混合する。混合方法は特に限定されず、攪拌機で撹拌する方法でも、超音波分散機で分散させる方法でもよい。混合時の温度は20~100℃、時間は1分~3時間であることが好ましい。混合比については、それぞれの酸化チタン微粒子分散液中の酸化チタン微粒子の質量比が、既に述べた通りの質量比になるように混合すればよい。
酸化チタン微粒子分散液の濃度(%)=不揮発分質量(g)/酸化チタン微粒子分散液質量(g)×100
本発明の可視光応答型光触媒酸化チタン微粒子分散液は、各種部材の表面に光触媒膜を形成させるために使用することができる。ここで、各種部材は、特に制限されないが、部材の材料としては、例えば、有機材料、無機材料が挙げられる。これらは、それぞれの目的、用途に応じた様々な形状を有することができる。
非金属無機材料としては、例えば、ガラス、セラミック、石材等が挙げられる。これらは、タイル、硝子、ミラー、壁、意匠材等の様々な形に製品化されていてもよい。
金属無機材料としては、例えば、鋳鉄、鋼材、鉄、鉄合金、アルミニウム、アルミニウム合金、ニッケル、ニッケル合金、亜鉛ダイキャスト等が挙げられる。これらは、上記金属無機材料のメッキが施されていてもよいし、上記有機材料が塗布されていてもよいし、上記有機材料又は非金属無機材料の表面に施すメッキであってもよい。
分散液中の酸化チタン微粒子の平均粒子径(D50)は、粒度分布測定装置(商品名“ナノトラック粒度分析計UPA-EX150”、日機装(株))を用いて測定した。
分散液を塗布、乾燥することで作製した光触媒薄膜の活性を、アセトアルデヒドガスの分解反応により評価した。評価はバッチ式ガス分解性能評価法により行った。
具体的には、容積5Lの石英ガラス窓付きステンレス製セル内にA4サイズ(210mm×297mm)のPETフィルム上の全面に乾燥質量として約50mg分の光触媒微粒子を含む光触媒薄膜を形成した評価用サンプルを設置したのち、該セルを湿度50%に調湿した濃度5ppmのアセトアルデヒドガスで満たし、該セル上部に設置したLED(商品型番“TH-211×200SW”、シーシーエス(株)、分光分布:400~800nm)で照度30,000Lxになるように光を照射した。薄膜上の光触媒によりアセトアルデヒドガスが分解すると、該セル中のアセトアルデヒドガス濃度が低下する。そこで、その濃度を測定することで、アセトアルデヒドガス分解量を求めることができる。アセトアルデヒドガス濃度は光音響マルチガスモニタ(商品名“INNOVA1412”、LumaSense社製)を用いて測定し、アセトアルデヒドガス濃度を初期の5ppmから、〔1〕1ppm、及び〔2〕0.03ppmまで低減させるのに要した時間を比較し、次の基準で評価した。試験は20時間まで実施した。
・非常に良好(◎と表示)・・・10時間以内に低減
・良好(○と表示)・・・20時間以内に低減
・やや不良(△と表示)・・・初期濃度(5ppm)からの低減は見られるが、20時間以内に基準値(1ppm及び0.03ppm)までは低減できない
・不良(×と表示)・・・初期濃度(5ppm)からの低減が見られない(全く低減されない)
酸化チタン微粒子の結晶相は、得られた酸化チタン微粒子の分散液を105℃、3時間乾燥させて回収した酸化チタン微粒子粉末の粉末X線回折(商品名“卓上型X線回折装置D2 PHASER”、ブルカー・エイエックスエス(株))を測定することで同定した。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液に塩化スズ(IV)をTi/Sn(モル比)が20となるように添加・溶解し、これを純水で10倍に希釈した後、この水溶液に、酸化モリブデン(VI)が前記の塩化チタン(IV)水溶液中のTi成分に対してTi/Mo(モル比)が20となるよう添加・溶解した10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、スズ及びモリブデンを含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは8であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、スズ及びモリブデンを含有する水酸化チタン沈殿物にH2O2/(Ti+Sn+Mo)(モル比)が10となるように35質量%過酸化水素水を添加し、その後50℃で3時間撹拌して十分に反応させ、橙色透明のスズ及びモリブデン含有ペルオキソチタン酸溶液(a)を得た。
36質量%の塩化チタン(IV)水溶液に塩化鉄(III)をTi/Fe(モル比)が10となるように添加し、これを純水で10倍に希釈した後、この水溶液に10質量%のアンモニア水を徐々に添加して中和、加水分解することにより鉄を含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは8であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の鉄を含有する水酸化チタン沈殿物にH2O2/(Ti+Fe)(モル比)が8となるように35質量%過酸化水素水を添加し、その後40℃で2時間撹拌して十分に反応させ、橙色透明の鉄含有ペルオキソチタン酸溶液(b)を得た。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
Ti/Mo(モル比)が3.3となるように酸化モリブデン(VI)を添加したことと、水熱処理時間を120分間としたこと以外は実施例1と同様にして、スズ及びモリブデンが固溶された酸化チタン微粒子(C)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(C)の粉末X線回折測定を行ったところ、観測されるピークはルチル型酸化チタンのもののみであり、スズ及びモリブデンが酸化チタンに固溶されていることが分かった。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
Ti/Mo(モル比)が100となるように酸化モリブデン(VI)を添加したこと以外は実施例1と同様にして、スズ及びモリブデンが固溶された酸化チタン微粒子(D)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(D)の粉末X線回折測定を行ったところ、観測されるピークはルチル型酸化チタンのもののみであり、スズ及びモリブデンが酸化チタンに固溶されていることが分かった。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
Ti/Sn(モル比)が5となるように塩化チタン(IV)水溶液を添加したことと、水熱処理温度を180℃としたこと以外は実施例1と同様にして、スズ及びモリブデンが固溶された酸化チタン微粒子(E)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(E)の粉末X線回折測定を行ったところ、観測されるピークはルチル型酸化チタンのもののみであり、スズ及びモリブデンが酸化チタンに固溶されていることが分かった。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
Ti/Sn(モル比)が33となるように塩化チタン(IV)水溶液を添加したことと、水熱処理温度を140℃としたこと以外は実施例1と同様にして、スズ及びモリブデンが固溶された酸化チタン微粒子(F)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(F)の粉末X線回折測定を行ったところ、観測されるピークはアナターゼ型酸化チタン、ルチル型酸化チタンのもののみであり、スズ及びモリブデンが酸化チタンに固溶されていることが分かった。
<スズ及びモリブデンが固溶された酸化チタン微粒子分散液の調製>
Ti/Mo(モル比)が12.5となるように酸化モリブデン(VI)を添加したこと以外は実施例1と同様にして、スズ及びモリブデンが固溶された酸化チタン微粒子(G)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(G)の粉末X線回折測定を行ったところ、観測されるピークはルチル型酸化チタンのもののみであり、スズ及びモリブデンが酸化チタンに固溶されていることが分かった。
Ti/Fe(モル比)が20となるように塩化鉄(III)を添加したことと、水熱処理時間を120分間としたこと以外は実施例1と同様にして、鉄が固溶された酸化チタン微粒子(H)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(H)の粉末X線回折測定を行ったところ、観測されるピークはアナターゼ型酸化チタンのもののみであり、鉄が酸化チタンに固溶されていることが分かった。
酸化チタン微粒子(G)と酸化チタン微粒子(H)が質量比で(G):(H)=60:40となるようにそれぞれの分散液を混合することで、本発明の可視光応答型光触媒酸化チタン微粒子分散液(E-7)を得た。
酸化チタン微粒子(A)と酸化チタン微粒子(H)が質量比で(A):(H)=50:50となるようにそれぞれの分散液を混合することで、本発明の可視光応答型光触媒酸化チタン微粒子分散液(E-8)を得た。
<スズ及びバナジウムが固溶された酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液に塩化スズ(IV)をTi/Sn(モル比)が20、硫酸バナジル(IV)をTi/V(モル比)が2000となるように添加・溶解し、これを純水で10倍に希釈した後、10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、スズ及びバナジウムを含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは8.5であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、スズ及びバナジウムを含有する水酸化チタン沈殿物にH2O2/(Ti+Sn+V)(モル比)が10となるように35質量%過酸化水素水を添加し、その後50℃で3時間撹拌して十分に反応させ、橙色透明のスズ及びバナジウム含有ペルオキソチタン酸溶液(i)を得た。
<スズ及びバナジウムが固溶された酸化チタン微粒子分散液の調製>
Ti/V(モル比)が500となるように硫酸バナジル(IV)を添加したことと水熱処理温度を180℃、水熱処理時間を20分としたこと以外は実施例9と同様にして、スズ及びバナジウムが固溶された酸化チタン微粒子(J)の分散液(固形分濃度1質量%)を得た。酸化チタン微粒子(J)の粉末X線回折測定を行ったところ、観測されるピークはルチル型酸化チタンのもののみであり、スズ及びバナジウムが酸化チタンに固溶されていることが分かった。
酸化チタン微粒子(A)と酸化チタン微粒子(I)と酸化チタン微粒子(B)が質量比で(A):(I):(B)=25:25:50となるようにそれぞれの分散液を混合することで、本発明の可視光応答型光触媒酸化チタン微粒子分散液(E-11)を得た。
酸化チタン微粒子(A)の分散液のみから酸化チタン微粒子分散液(C-1)を得た。
酸化チタン微粒子(B)の分散液のみから酸化チタン微粒子分散液(C-2)を得た。
<銅が固溶された酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液に塩化銅(II)をTi/Cu(モル比)が20となるように添加・溶解し、これを純水で10倍に希釈した後、10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、銅を含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは7.5であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、銅を含有する水酸化チタン沈殿物にH2O2/(Ti+Cu)(モル比)が12となるように35質量%過酸化水素水を添加し、その後40℃で3時間撹拌して十分に反応させ、緑色透明の銅含有ペルオキソチタン酸溶液(k)を得た。
酸化チタン微粒子(G)と酸化チタン微粒子(K)が質量比で(G):(K)=90:10となるようにそれぞれの分散液を混合することで、酸化チタン微粒子分散液(C-4)を得た。
酸化チタン微粒子(G)と酸化チタン微粒子(K)が質量比で(G):(K)=60:40となるようにそれぞれの分散液を混合することで、酸化チタン微粒子分散液(C-5)を得た。
酸化チタン微粒子(I)と酸化チタン微粒子(K)が質量比で(I):(K)=50:50となるようにそれぞれの分散液を混合することで、酸化チタン微粒子分散液(C-6)を得た。
<スズが固溶された酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液に塩化スズ(IV)をTi/Sn(モル比)が20となるように添加・溶解し、これを純水で10倍に希釈した後、10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、スズを含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは9であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、スズを含有する水酸化チタン沈殿物にH2O2/(Ti+Sn)(モル比)が6となるように35質量%過酸化水素水を添加し、その後室温で一昼夜撹拌して十分に反応させ、橙色透明のスズ含有ペルオキソチタン酸溶液(l)を得た。
<モリブデンが固溶された酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液を純水で10倍に希釈した後、この水溶液に、酸化モリブデン(VI)が前記の塩化チタン(IV)水溶液中のTi成分に対してTi/Mo(モル比)が20となるよう添加・溶解した10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、モリブデンを含有する水酸化チタンの沈殿物を得た。このときの溶液のpHは8であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、モリブデンを含有する水酸化チタン沈殿物にH2O2/(Ti+Mo)(モル比)が8となるように35質量%過酸化水素水を添加し、その後室温で一昼夜撹拌して十分に反応させ、橙色透明のモリブデン含有ペルオキソチタン酸溶液(m)を得た。
<酸化チタン微粒子分散液の調製>
36質量%の塩化チタン(IV)水溶液を純水で10倍に希釈した後、10質量%のアンモニア水を徐々に添加して中和、加水分解することにより、水酸化チタンの沈殿物を得た。このときの溶液のpHは9であった。得られた沈殿物を、純水の添加とデカンテーションを繰り返して脱イオン処理した。この脱イオン処理後の、水酸化チタン沈殿物にH2O2/Ti(モル比)が5となるように35質量%過酸化水素水を添加し、その後室温で一昼夜撹拌して十分に反応させ、黄色透明のペルオキソチタン酸溶液(n)を得た。
<鉄が固溶された酸化チタン微粒子分散液からの溶解成分の回収>
鉄が固溶された酸化チタン微粒子(B)の分散液を小型超遠心機(商品名“himac CS150NX”、日立工機(株)製)により210,000×gで遠心分離することで、鉄が固溶された酸化チタン微粒子(B)と、溶媒及び溶解成分に分離した。溶媒中の鉄溶解成分濃度をICP発光分析装置(商品名“ICP発行分析装置 IRIS 1000”、サーモフィッシャーサイエンティフィック(株))で測定したところ、2.2ppmであり、添加した鉄成分のうち、ほとんどが酸化チタン微粒子へ固溶されているなど、不溶成分となっていることが分かった。
<鉄成分が表面に吸着(=担持)された酸化チタン微粒子分散液の調製>
酸化チタン微粒子(G)の分散液と塩化鉄(III)を純水で溶解した塩化鉄(III)水溶液を、酸化チタン微粒子(G)と鉄の質量比が100:0.05となるように混合することで、鉄成分が表面に吸着された酸化チタン微粒子分散液(C-11)を得た。
<鉄成分が表面に吸着(=担持)された酸化チタン微粒子分散液の調製>
酸化チタン微粒子(G)の分散液と塩化鉄(III)を純水で溶解した塩化鉄(III)水溶液を、酸化チタン微粒子(G)と鉄の質量比が100:0.5となるように混合したところ、分散液(C-12)中の酸化チタン微粒子が凝集して沈殿したため、評価を中止した。このように鉄族化合物を分散液に添加する方法は分散液中の酸化チタン微粒子の分散状態を悪化させるため、添加量が極めて少量に制限され、液の安定性も悪くなるという問題点がある。
Claims (12)
- 水性分散媒中に、スズ成分及び可視光応答性を高める遷移金属成分(但し鉄族成分を除く)が固溶された第1の酸化チタン微粒子と鉄族成分が固溶された第2の酸化チタン微粒子との2種類の酸化チタン微粒子が分散されていることを特徴とする可視光応答型光触媒酸化チタン微粒子分散液。
- 第1の酸化チタン微粒子に含有されるスズ成分の含有量がチタンとのモル比(Ti/Sn)で1~1,000である請求項1に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第1の酸化チタン微粒子に固溶される遷移金属成分が、バナジウム、クロム、マンガン、ニオブ、モリブデン、ロジウム、アンチモン、タングステン、セリウムから選ばれる少なくとも1つである請求項1又は2に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第1の酸化チタン微粒子に固溶される遷移金属成分が、モリブデン及びバナジウムから選ばれる少なくとも1つである請求項1又は2に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第1の酸化チタン微粒子に含有されるモリブデン成分の含有量がチタンとのモル比(Ti/Mo)で1~1,000であり、バナジウム成分の含有量がチタンとのモル比(Ti/V)で10~10,000である請求項4に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第2の酸化チタン微粒子に含有される鉄族成分の含有量がチタンとのモル比(Ti/鉄族成分)で1~1,000である請求項1~5のいずれか1項に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第2の酸化チタン微粒子に固溶された鉄族成分が、鉄成分である請求項1~6のいずれか1項に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 第1の酸化チタン微粒子と第2の酸化チタン微粒子の混合比が、それぞれの質量比[(第1の酸化チタン微粒子)/(第2の酸化チタン微粒子)]で99~0.01である請求項1~7のいずれか1項に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 更に、バインダーを含有する請求項1~8のいずれか1項に記載の可視光応答型光触媒酸化チタン分散液。
- バインダーがケイ素化合物系バインダーである請求項9に記載の可視光応答型光触媒酸化チタン微粒子分散液。
- 請求項1~10のいずれか1項に記載の可視光応答型光触媒酸化チタン微粒子分散液による光触媒薄膜を表面に有する部材。
- (1)原料チタン化合物、スズ化合物、遷移金属化合物(但し鉄族化合物を除く)、塩基性物質、過酸化水素及び水性分散媒から、スズ及び遷移金属含有ペルオキソチタン酸溶液を製造する工程、
(2)上記(1)の工程で製造したスズ及び遷移金属含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、スズ及び遷移金属含有酸化チタン微粒子分散液を得る工程、
(3)原料チタン化合物、鉄族化合物、塩基性物質、過酸化水素及び水性分散媒から、鉄族元素含有ペルオキソチタン酸溶液を製造する工程、
(4)上記(3)の工程で製造した鉄族元素含有ペルオキソチタン酸溶液を、圧力制御の下、80~250℃で加熱し、鉄族元素含有酸化チタン微粒子分散液を得る工程、
(5)上記(2)、(4)の工程で製造した2種類の酸化チタン微粒子分散液を混合する工程
を有することを特徴とする可視光応答型光触媒酸化チタン微粒子分散液の製造方法。
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CN107427818B (zh) | 2021-02-02 |
JP6394788B2 (ja) | 2018-09-26 |
US11446640B2 (en) | 2022-09-20 |
AU2016237640A1 (en) | 2017-10-05 |
TWI732752B (zh) | 2021-07-11 |
EP3275536A1 (en) | 2018-01-31 |
TW201700165A (zh) | 2017-01-01 |
JPWO2016152487A1 (ja) | 2017-08-03 |
US20180117567A1 (en) | 2018-05-03 |
CN107427818A (zh) | 2017-12-01 |
KR20170131505A (ko) | 2017-11-29 |
EP3275536A4 (en) | 2018-12-19 |
AU2016237640B2 (en) | 2020-02-20 |
EP3275536B1 (en) | 2023-03-08 |
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