JP5723883B2 - 光触媒皮膜の製造方法及び光触媒皮膜 - Google Patents
光触媒皮膜の製造方法及び光触媒皮膜 Download PDFInfo
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- JP5723883B2 JP5723883B2 JP2012529628A JP2012529628A JP5723883B2 JP 5723883 B2 JP5723883 B2 JP 5723883B2 JP 2012529628 A JP2012529628 A JP 2012529628A JP 2012529628 A JP2012529628 A JP 2012529628A JP 5723883 B2 JP5723883 B2 JP 5723883B2
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- slurry
- titanium dioxide
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- water
- photocatalyst
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- 238000004519 manufacturing process Methods 0.000 title claims description 48
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- 239000011941 photocatalyst Substances 0.000 claims description 120
- 239000002002 slurry Substances 0.000 claims description 80
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- 239000004408 titanium dioxide Substances 0.000 claims description 57
- 229910052742 iron Inorganic materials 0.000 claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
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- 150000001875 compounds Chemical class 0.000 claims description 17
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- 150000004696 coordination complex Chemical class 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 150000004679 hydroxides Chemical class 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 8
- 229910021645 metal ion Inorganic materials 0.000 claims description 8
- 238000005316 response function Methods 0.000 claims description 7
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 46
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- 239000000843 powder Substances 0.000 description 37
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- 238000000034 method Methods 0.000 description 26
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- 230000006870 function Effects 0.000 description 16
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- 239000007789 gas Substances 0.000 description 14
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 13
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical class O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 11
- 238000011068 loading method Methods 0.000 description 11
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 8
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- 230000001954 sterilising effect Effects 0.000 description 7
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- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- 206010011409 Cross infection Diseases 0.000 description 1
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- 229910021536 Zeolite Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229910017052 cobalt Inorganic materials 0.000 description 1
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- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
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Images
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/349—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of flames, plasmas or lasers
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- 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
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
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- C23C18/127—Preformed particles
Description
本発明を適用した光触媒皮膜の製造方法の一例では、(1)水スラリー生成プロセス、(2)溶射皮膜形成プロセスの2つのプロセスで成り立っている。以下、各プロセスについて詳細に説明を行う。
本発明を適用した光触媒皮膜の製造方法の一例では、二酸化チタン粉末(TiO2)のTi成分と塩化鉄水溶液(FeCl3)のFe成分が重量比でTi:Fe=99:1となる様に、二酸化チタン粉末と塩化鉄水溶液を用いた水スラリー(濃度30重量%)を生成する。
本発明を適用した光触媒皮膜の製造方法の一例では、続いて、生成した水スラリーを用いて溶射を行って光触媒皮膜を成膜する。
これに対して、本発明を適用した光触媒皮膜の製造方法で得られる光触媒皮膜では、こうした不具合が生じることが無く、可視光応答性に優れると共に可視光応答性の長寿命化が実現する。
図6に評価試験方法の概念図を示す。評価に用いた溶射皮膜の試験片は約50mm角のサイズで、基材には磁器タイルを用いた。試験片は表面を予めアルコールで洗浄し、紫外線(紫外線強度:1mW/cm2)を12時間照射する前処理を施して、ガス分解の評価試験に用いた。
図7及び図8から、本発明を適用した光触媒皮膜の製造方法で得られる光触媒皮膜は高いアセトアルデヒドガス分解活性を示すことが分かる。また、二酸化炭素についてもアセトアルデヒドの約2倍量の発生が見られ、完全分解が行われていると考えられる。
図9に評価試験方法の概念図を示す。評価に用いた溶射皮膜の試験片は、約50mm角のサイズで、基材には磁器タイルを用いた。試験片は表面をアセトン洗浄し、紫外線(紫外線強度:1mW/cm2)を6時間照射する前処理を施して、抗菌活性の評価試験に供した。
上記した本発明を適用した光触媒皮膜の製造方法では、ルチル型の二酸化チタン粉末と塩化鉄水溶液を用いた水スラリーを生成しているが、アナターゼ型の二酸化チタン粉末と塩化鉄水溶液を用いた水スラリーを生成しても良い。具体的には、例えば、粒径が10nm程度のアナターゼ型の二酸化チタン粉末と塩化鉄水溶液を用いた水スラリーを生成しても良い。なお、この際、水スラリー中ではアナターゼ型の二酸化チタン粉末は凝集して1μm〜5μm程度の粒径をなしている。
上記した本発明を適用した光触媒皮膜の製造方法では、ルチル型の二酸化チタン粉末に可視光応答機能を呈するFeO(OH)を担持し、可視光応答型光触媒皮膜を実現する場合を例に挙げて説明を行っている。
しかしながら、光触媒粒子に担持するのは可視光応答機能を呈するものに限定される必要はなく、助触媒機能を呈するFe2O3等であっても良い。
上記した本発明を適用した光触媒皮膜の製造方法の一例では、二酸化チタン粉末と塩化鉄水溶液を用いた水スラリーを用いて溶射を行うことで、鉄の酸化物、水酸化物、オキシ水酸化物の少なくとも1種類の形態が担持した二酸化チタン皮膜を成膜する場合を例に挙げて説明を行っているが、鉄のみならず銀の酸化物、水酸化物、オキシ水酸化物の少なくとも1種類の形態をも担持した二酸化チタン皮膜を成膜しても良い。
また、皮膜表層に厚い銀の偏析の存在が確認でき、こうした表層の銀の偏析に起因して二酸化チタンに到達する光強度が低下してしまい、光触媒性能の低下が懸念される。
上記した本発明を適用した光触媒皮膜の製造方法の一例では、二酸化チタン粉末と塩化鉄水溶液を用いた水スラリーを用いて溶射を行うことで、鉄が担持した二酸化チタン皮膜を成膜する場合を例に挙げて説明を行っているが、鉄のみならず顔料をも担持した二酸化チタン皮膜を成膜しても良い。なお、顔料を担持させることによって光触媒皮膜を着色することができ、顔料の付着量の度合いによって色合いに変化が生じることとなる。
Claims (6)
- ルチル型二酸化チタン粒子と、Fe,Cu,Cr,Niの水溶性金属錯体または水溶性金属塩から選ばれる少なくとも1種類の化合物と、水とを含むスラリーを形成する工程と、
前記スラリーを溶射して、少なくとも1種類の前記化合物のマイナスイオンが溶射の熱で揮発し、前記化合物の金属イオンが前記スラリーの水及び空気中の酸素と反応して生成された、可視光応答機能と助触媒機能とを発現する、Fe,Cu,Cr,Niの水酸化物又はオキシ水酸化物の少なくとも1種類の形態と、前記水酸化物又は前記オキシ水酸化物と共に生成された、可視光応答機能と助触媒機能とを発現する、Fe,Cu,Cr,Niの酸化物の少なくとも1種類の形態とを前記スラリー中のルチル型二酸化チタン粒子に担持させると共に、同ルチル型二酸化チタン粒子を対象物に積層する工程とを備える
光触媒皮膜の製造方法。 - 前記ルチル型二酸化チタン粒子を対象物に積層する工程は、前記スラリーをフレーム温度2000〜2500℃で溶射する
請求項1に記載の光触媒皮膜の製造方法。 - 抗菌金属、抗菌金属塩または抗菌金属錯体から選ばれる少なくとも一種類を含んで前記スラリーを形成し、
前記スラリーを溶射して、前記ルチル型二酸化チタン粒子と共に前記抗菌金属、抗菌金属塩または抗菌金属錯体を、金属、金属塩、金属錯体、オキシ水酸化物、水酸化物、または、酸化物から選ばれる少なくとも一種類の形態で対象物に積層する
請求項1または請求項2に記載の光触媒皮膜の製造方法。 - 顔料を含んで前記スラリーを形成し、
前記スラリーを溶射して、前記ルチル型二酸化チタン粒子と共に顔料を対象物に積層する
請求項1、請求項2または請求項3に記載の光触媒皮膜の製造方法。 - 吸着材を含んで前記スラリーを形成し、
前記スラリーを溶射して、前記ルチル型二酸化チタン粒子と共に吸着材を対象物に積層する
請求項1、請求項2または請求項3に記載の光触媒皮膜の製造方法。 - ルチル型二酸化チタン粒子と、Fe,Cu,Cr,Niの水溶性金属錯体または水溶性金属塩から選ばれる少なくとも1種類の化合物と、水とを含むスラリーを形成し、
前記スラリーを溶射して、少なくとも1種類の前記化合物のマイナスイオンが溶射の熱で揮発し、前記化合物の金属イオンが前記スラリーの水及び空気中の酸素と反応して生成された、可視光応答機能と助触媒機能とを発現する、Fe,Cu,Cr,Niの水酸化物又はオキシ水酸化物の少なくとも1種類の形態と、前記水酸化物又は前記オキシ水酸化物と共に生成された、可視光応答機能と助触媒機能とを発現する、Fe,Cu,Cr,Niの酸化物の少なくとも1種類の形態とを前記スラリー中のルチル型二酸化チタン粒子に担持させると共に、同ルチル型二酸化チタン粒子を対象物に積層して製造された
光触媒皮膜。
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