JP6807629B2 - 鉄化合物担持酸化チタン光触媒 - Google Patents
鉄化合物担持酸化チタン光触媒 Download PDFInfo
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- JP6807629B2 JP6807629B2 JP2016223952A JP2016223952A JP6807629B2 JP 6807629 B2 JP6807629 B2 JP 6807629B2 JP 2016223952 A JP2016223952 A JP 2016223952A JP 2016223952 A JP2016223952 A JP 2016223952A JP 6807629 B2 JP6807629 B2 JP 6807629B2
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- photocatalyst
- titanium oxide
- iron
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims description 171
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 title claims description 89
- 239000011941 photocatalyst Substances 0.000 title claims description 84
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 41
- 229910052742 iron Inorganic materials 0.000 title description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 34
- 229910052801 chlorine Inorganic materials 0.000 claims description 22
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 22
- 238000002441 X-ray diffraction Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000013078 crystal Substances 0.000 claims description 18
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 17
- 150000002506 iron compounds Chemical class 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
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- 238000000576 coating method Methods 0.000 claims description 12
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- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000004438 BET method Methods 0.000 claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 26
- 230000001699 photocatalysis Effects 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- -1 iron ion Chemical class 0.000 description 14
- 238000002360 preparation method Methods 0.000 description 12
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000003373 anti-fouling effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 4
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
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- LZKLAOYSENRNKR-LNTINUHCSA-N iron;(z)-4-oxoniumylidenepent-2-en-2-olate Chemical compound [Fe].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O LZKLAOYSENRNKR-LNTINUHCSA-N 0.000 description 3
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- 229910052751 metal Inorganic materials 0.000 description 3
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- 239000000126 substance Substances 0.000 description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 3
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- 238000004887 air purification Methods 0.000 description 2
- 229940121375 antifungal agent Drugs 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 2
- HNSDLXPSAYFUHK-UHFFFAOYSA-N 1,4-bis(2-ethylhexyl) sulfosuccinate Chemical compound CCCCC(CC)COC(=O)CC(S(O)(=O)=O)C(=O)OCC(CC)CCCC HNSDLXPSAYFUHK-UHFFFAOYSA-N 0.000 description 1
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
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- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000007806 chemical reaction intermediate Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 239000002781 deodorant agent Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
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- 238000007646 gravure printing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
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- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
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- 150000002505 iron Chemical class 0.000 description 1
- 150000004698 iron complex Chemical class 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
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- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
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- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- 150000003609 titanium compounds Chemical class 0.000 description 1
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
- B01J27/128—Halogens; Compounds thereof with iron group metals or platinum group metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
- B01J27/135—Halogens; Compounds thereof with titanium, zirconium, hafnium, germanium, tin or lead
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- 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
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- B01J35/391—Physical properties of the active metal ingredient
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Description
本発明の他の目的は、可視光線及び紫外線の何れに対しても優れた応答性を有する、高活性な光触媒の製造方法を提供することにある。
本発明の他の目的は、可視光線及び紫外線の何れに対しても優れた応答性を有する、高活性な光触媒を含むコーティング液を提供することにある。
本発明の他の目的は、可視光線及び紫外線の何れに対しても優れた応答性を有する、高活性な光触媒を含むコーティング層を備えた光触媒塗装体を提供することにある。
本発明の光触媒は、酸化チタン表面に鉄化合物を担持した構成を有する光触媒であって、前記酸化チタンの比表面積(BET法測定による)が7〜55m2/gの範囲であり、前記酸化チタンがルチル型とアナターゼ型とが30/70〜95/5(前者/後者(X線回折ピーク強度比))の範囲で混在した結晶型を有することを特徴とする。
本発明の光触媒は、例えば、ルチル型とアナターゼ型とが30/70〜95/5(前者/後者(X線回折ピーク強度比))の範囲で混在した結晶型を有し、酸化チタンの比表面積(BET法測定による)は7〜55m2/gの範囲である酸化チタンに塩化鉄(III)を担持させる工程を経て製造することができる。
(I)チタンテトライソプロポキシドを600〜800℃の温度での熱分解反応に付す方法(気相法)
(II)ゾル−ゲル法で得られた非晶質酸化チタンを、300〜600℃の温度で焼成する方法(液相法)
(III)オートクレーブ中、チタンアルコキシドを250〜300℃で水熱処理する方法(水熱法)
本発明のコーティング液は、任意の塗布対象物に塗布することで、当該塗布対象物表面に上記光触媒を含むコーティング層を形成する用途に用いられるものであり、少なくとも上記光触媒を含む。本発明のコーティング液は、上記光触媒の他に、例えば、バインダー樹脂、着色顔料、分散媒等を必要に応じて適宜含有することができる。
本発明の光触媒塗装体は、基材表面に前記光触媒を含むコーティング層を1層又は2層以上備えることを特徴とする。
四塩化チタンをバーナー中で燃焼させ、酸化チタン(30)[比表面積:45m2/g、ルチル型とアナターゼ型の混合割合(X線回折ピーク強度比):30/70)が混在した結晶型を有する]を製造した。
四塩化チタンをバーナー中で燃焼させ、酸化チタン(50)[比表面積:30m2/g、ルチル型とアナターゼ型の混合割合(X線回折ピーク強度比):50/50]を製造した。
調製例1で得られた酸化チタン(30)を大気中、電気炉で1000℃で90分加熱することにより、酸化チタン(71)[比表面積:20m2/g、ルチル型とアナターゼ型の混合割合(X線回折ピーク強度比):71/29]を製造した。
調製例1で得られた酸化チタン(30)10gとイオン交換水90gを撹拌混合して懸濁液を得た。
得られた懸濁液に、塩化鉄(III)水溶液(塩化鉄(III)濃度:38重量%)0.15gを添加し、25℃にて30分間撹拌した。その後、メタノール2.3g(酸化チタンの23重量%に相当)を添加し、更に6時間撹拌した。
その後、懸濁液を、上澄み液の電気伝導度が200μS/cm以下となるまで水洗を行う粉体洗浄に付し、高速遠心沈降機(遠心力:20000G、遠心時間:10〜20分)を用いて粉体を沈降させた。
沈降した粉体を分取し、真空乾燥機を用いて60℃で乾燥を行って乾燥粉体を得た。
得られた乾燥粉体を乳鉢ですり潰して、光触媒(1)(Fe/酸化チタン(30)、酸化チタンに対して、鉄元素含有量:1820ppm、塩素原子含有量:1310ppm、鉄元素含有量/塩素原子含有量:1.39)を得た。
調製例1で得られた酸化チタン(30)に代えて、調製例3で得られた酸化チタン(71)を使用した以外は実施例1と同様にして、光触媒(2)(Fe/酸化チタン(71)、酸化チタンに対して、鉄元素含有量:1740ppm、塩素原子含有量:1270ppm、鉄元素含有量/塩素原子含有量:1.37)を得た。
懸濁液に、塩化鉄(III)水溶液とメタノールを添加した後、10Wのブラックライトを用いて紫外線(UV)を6時間照射(UV照射量:10mW/cm2)した以外は実施例1と同様にして、光触媒(3)(Fe/酸化チタン(30)(UV)、酸化チタンに対して、鉄元素含有量:230ppm、塩素原子含有量:650ppm、鉄元素含有量/塩素原子含有量:0.35)を得た。
調製例1で得られた酸化チタン(30)に代えて、調製例2で得られた酸化チタン(50)を使用して懸濁液を得、得られた懸濁液に、塩化鉄(III)水溶液とメタノールを添加した後、10Wのブラックライトを用いて紫外線(UV)を6時間照射(UV照射量:10mW/cm2)した以外は実施例1と同様にして、光触媒(4)(Fe/酸化チタン(50)(UV)、酸化チタンに対して、鉄元素含有量:220ppm、塩素原子含有量:630ppm、鉄元素含有量/塩素原子含有量:0.35)を得た。
調製例1で得られた酸化チタン(30)に代えて、調製例3で得られた酸化チタン(71)を使用して懸濁液を得、得られた懸濁液に、塩化鉄(III)水溶液とメタノールを添加した後、10Wのブラックライトを用いて紫外線(UV)を6時間照射(UV照射量:10mW/cm2)した以外は実施例1と同様にして、光触媒(5)(Fe/酸化チタン(71)(UV)、酸化チタンに対して、鉄元素含有量:210ppm、塩素原子含有量:620ppm、鉄元素含有量/塩素原子含有量:0.34)を得た。
調製例1で得られた酸化チタン(30)に代えて、酸化チタン(20)(ルチル型とアナターゼ型が混在した結晶型を有する酸化チタン、ルチル型とアナターゼ型の混合割合(X線回折ピーク強度比):20/80、比表面積:50m2/g、商品名「AEROXIDE TiO2 P25」、日本アエロジル(株)製)を使用した以外は実施例1と同様にして、光触媒(7)(Fe/酸化チタン(20)、酸化チタンに対して、鉄元素含有量:2120ppm、塩素原子含有量:1500ppm、鉄元素含有量/塩素原子含有量:1.41)を得た。
光触媒の鉄元素含有量は、以下の方法で測定した。
光触媒約20mgを精秤し、硫酸1mLを加えた後、砂浴上で加熱溶解した。溶解後、少量の超純水を加えてリフラックスした後、これをIWAKI製PP容器にて20mLにメスアップし、更に0.2μmフィルター処理を施してサンプルを調製し、これをICP発光分析(ICP発光分析装置:(株)リガク製、CIROS)に付した。
また、光触媒を加えなかった以外は前記と同様にして得られたサンプルをブランクとして使用した。検量線用の標準液は、SPEX社製ICP−MS用混合標準液XSTC−22を同濃度の硫酸水溶液にて希釈調整したものを使用した。
光触媒の塩素原子含有量は、下記条件で測定した。
燃焼条件
使用機器:ダイアインスツルメンツ製AQF−100
サンプル:約20mg
燃焼プログラム:2
吸収液:H2O2150ppm
内部標準液:酒石酸5ppm
吸収液量:10mL
イオンクロマト条件
使用機器:DIONEX ICS−2000(低濃度分析モード)
本カラム:AS−12
プレカラム:AG−12
溶離液:3.0mM K2CO3+0.3mM EPM
サプレッサー:ASRS(リサイクルモード)
流速:1.2mL/分
検出器:電気伝導度検出器
カラム温度:35℃
注入量:100μL
光触媒(1)〜(7)、及び酸化チタン(20)の光触媒活性は、メタノールを酸化し、生成するCO2量を測定することによりで光触媒活性を評価した。
すなわち、光触媒約200mgをガラス製皿に広げ、反応容器(容量:200mL、ANALYTIC−BARRIER、ジーエルサイエンス(株)製)の中に入れ、真空状態にした後、メタノールガス(空気希釈;800体積ppm)125mLを反応容器内に吹き込んだ。メタノールガスの光触媒への吸着が平衡に達した後、25℃で光照射(光源:405nmLED、照度:2.5W/m2)を行った。
光照射開始24時間後における反応容器内のCO2濃度をメタナイザー(商品名「MT221」、GLサイエンス(株)製)が付属した水素炎イオン化検出器付きガスクロマトグラフ(商品名「GC−14B」、島津製作所製)を使用して測定し、光照射開始前における反応用器内のCO2濃度を差し引いた値を、CO2の生成量とした。結果を図1、2に示す。
また、ルチル型とアナターゼ型の混合割合は、前記範囲内においてルチル型の含有割合が上がると、触媒活性が向上する傾向があることが分かる。
更に、鉄化合物担持の際に励起光を照射して得られる光触媒は、励起光を照射することなく得られた光触媒に比べて飛躍的に触媒活性が向上することが分かる。
Claims (7)
- 酸化チタン表面に鉄化合物を担持した構成を有する光触媒であって、前記酸化チタンの比表面積(BET法測定による)が7〜55m2/gの範囲であり、前記酸化チタンがルチル型とアナターゼ型とが50/50を越え、95/5以下(前者/後者(X線回折ピーク強度比))の範囲で混在した結晶型を有することを特徴とする光触媒。
- 反応容器(容量:200mL)の中に、当該光触媒200mgを仕込み、メタノールガス(空気希釈、800体積ppm)で前記反応容器内を満たした状態で、25℃において、24時間光照射(光源:405nmLED、照度:2.5W/m2)を行った際の前記反応容器中における二酸化炭素の生成量(濃度換算)が300体積ppm以上である、請求項1に記載の光触媒。
- 酸化チタン基準での、鉄元素含有量が50〜2000ppm、塩素原子含有量が50〜1400ppmであり、鉄元素含有量/塩素原子含有量(重量比)が1.50以下である、請求項1又は2に記載の光触媒。
- ルチル型とアナターゼ型とが50/50を越え、95/5以下(前者/後者(X線回折ピーク強度比))の範囲で混在した結晶型を有し、比表面積(BET法測定による)が7〜55m2/gの範囲である酸化チタンに塩化鉄(III)を担持させる工程を経て請求項1〜3の何れか1項に記載の光触媒を得る、光触媒の製造方法。
- 酸化チタンに塩化鉄(III)を担持させる際に励起光を照射する、請求項4に記載の光触媒の製造方法。
- 請求項1〜3の何れか1項に記載の光触媒を含むコーティング液。
- 基材表面に請求項1〜3の何れか1項に記載の光触媒を含むコーティング層を備えた光触媒塗装体。
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