JP5241994B2 - 酸化チタン粒子粉末及び光触媒 - Google Patents
酸化チタン粒子粉末及び光触媒Info
- Publication number
- JP5241994B2 JP5241994B2 JP2004322635A JP2004322635A JP5241994B2 JP 5241994 B2 JP5241994 B2 JP 5241994B2 JP 2004322635 A JP2004322635 A JP 2004322635A JP 2004322635 A JP2004322635 A JP 2004322635A JP 5241994 B2 JP5241994 B2 JP 5241994B2
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- Prior art keywords
- titanium oxide
- oxide particle
- particle powder
- particles
- nanostructure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002245 particle Substances 0.000 title claims description 117
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims description 77
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 title claims description 69
- 239000000843 powder Substances 0.000 title claims description 63
- 239000011941 photocatalyst Substances 0.000 title claims description 10
- 239000011164 primary particle Substances 0.000 claims description 41
- 239000002086 nanomaterial Substances 0.000 claims description 33
- 238000002441 X-ray diffraction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 26
- 239000013078 crystal Substances 0.000 description 16
- 229910017053 inorganic salt Inorganic materials 0.000 description 16
- 239000000243 solution Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 239000002105 nanoparticle Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 230000001699 photocatalysis Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 8
- 239000010409 thin film Substances 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 235000002639 sodium chloride Nutrition 0.000 description 5
- 238000005118 spray pyrolysis Methods 0.000 description 5
- 238000003917 TEM image Methods 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 4
- 229960000907 methylthioninium chloride Drugs 0.000 description 4
- 238000013032 photocatalytic reaction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000005979 thermal decomposition reaction Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 239000012798 spherical particle Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003542 behavioural effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 1
- 230000001443 photoexcitation Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000013076 target substance Substances 0.000 description 1
- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/07—Producing by vapour phase processes, e.g. halide oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/70—Catalysts, in general, characterised by their form or physical properties characterised by their crystalline properties, e.g. semi-crystalline
- B01J35/77—Compounds characterised by their crystallite size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/18—Methods for preparing oxides or hydroxides in general by thermal decomposition of compounds, e.g. of salts or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
- C01F7/308—Thermal decomposition of nitrates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0536—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing chloride-containing salts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
- C01G25/02—Oxides
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C01P2004/32—Spheres
- C01P2004/34—Spheres hollow
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- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Nanotechnology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Composite Materials (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
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Description
従来の噴霧熱分解法では原理上、生成粒子径は出発液滴径及び溶質濃度によって、ほぼ一義的に決定される。従って、噴霧熱分解法にてナノ粒子を製造しようとした場合、出発液滴の微小化、或いは溶質濃度の希薄化が必要となる。
液滴の微小化技術としては、超音波噴霧方式等が挙げられるが、数μmが限界であり、故に非現実的な溶質の希薄化が要求される。しかも、前記の液滴微小化技術ではいずれも極少量しか噴霧できず工業的であるとは言い難い。
一方、溶媒の蒸発速度が著しく大きい場合、溶媒及び溶質の移動が追いつかず、液滴表面に乾燥殻が生じる。内部には溶媒が閉じ込められた状態となる。さらに受熱することで、内圧が上昇し、やがて爆裂・破胞し、薄膜となる。これら両者現象を利用することで、薄膜或いは球体を作り分けることが可能となる。
即ち、薄膜状のナノ構造体では、薄膜と薄膜との間で接触面が発生するため、接触面を起点に焼結が進行する可能性があるものと考えられる。一方、球体状のナノ構造体では、球体間では基本的には接触面が小さく、また、数点しか発生しないため、焼結がより抑制できたと考えられる。
その結果、光励起に寄与する酸化チタン粒子の数も増加するとともに、一次粒子がナノサイズであることによって、高い活性を有するので、電子と正孔の表面反応速度が大きくなる。
従って、浄化対象物を短期間で、効率よく吸着・分解することができるものと本発明者は推定している。
但し、β=装置に起因する機械幅を補正した真の回折ピークの半値幅(ラジアン単位)。
K=シェラー定数(=0.9)。
λ=X線の波長(Cu Kα線 0.1542nm)。
θ=回折角(各結晶面の回折ピークに対応)。
酸化チタン粒子粉末の液相挙動は、「HELOS SYSTEM PARTICLE SIZE ANALYZER(以下、「へロス」とよぶ。)」 (JEOL製)を使用した。分散媒は純水を使用し、試料濃度を10%に調整し、超音波を300s照射した後、測定を行った。
水に四塩化チタン、硫酸ナトリウムをそれぞれ0.15mol/L、0.3mol/Lずつ溶解させて原料溶液を調製した。ここに得た原料溶液を二流体ノズルにより噴霧し、空気に同伴させ、加熱炉に供給した。加熱炉を出た粒子はバグフィルターにより捕集し、回収した粒子は超音波洗浄及び遠心分離により洗浄後、乾燥させた。
なお、加熱炉には抵抗加熱方式の管状炉を用い、炉心管には内径(D)70mm、有効長さ(L)1800mmのセラミック管を用いた。炉温は700℃とした。なお、使用した空気流量は全量で40NL/minとした。
得られた酸化チタン粒子粉末の水中での分散状態を図3に示す。へロスで測定した酸化チタン粒子粉末の平均粒径は0.4μmであり、SEM観察による粒子径とがほぼ同様であることから、得られた酸化チタン粒子粉末は水中においてほぼ単分散しているものと推定できる。
水に四塩化チタン、硫酸ナトリウムをそれぞれ0.15mol/L、0.3mol/Lずつ溶解させて原料溶液を調製した。ここに得た原料溶液を二流体ノズルにより噴霧し、空気に同伴させ、加熱炉に供給した。加熱炉を出た粒子はバグフィルターにより捕集し、回収した粒子は超音波洗浄及び遠心分離により洗浄後、乾燥させた。
なお、加熱炉には抵抗加熱方式の管状炉を用い、炉心管には内径(D)70mm、有効長さ(L)1800mmのセラミック管を用いた。炉温は600℃とした。なお、使用した空気流量は全量で40NL/minとした。
BET比表面積は202m2/gであった。
得られた酸化チタン粒子粉末の水中での分散状態を図5に示す。へロスで測定した酸化チタン粒子粉末の平均粒径は0.5μmであり、SEM観察による粒子径とがほぼ同様であることから、得られた酸化チタン粒子粉末は水中において、ナノ構造体の状態でほぼ単分散しているものと推定できる。
比較例としてST−01(石原産業製)を用いた。
実施例1、2、比較例1の酸化チタン粉末の光触媒活性はメチレンブルー水溶液(MB溶液)の脱色性能で評価した。
なおメチレンブルーは使用したブラックライトのUVではほとんど分解されず、光触媒作用により分解されて青色から無色になることから、光触媒の活性評価に広く用いられている。
Claims (3)
- 平均粒子径が30nm以下の一次粒子で構成されたナノ構造体からなり、ナノ構造体の粒子形状が中空状の球体であり、該ナノ構造体の電子顕微鏡観察から算出した一次粒子径とX線回折から算出した結晶子サイズとの比(電子顕微鏡観察から算出した一次粒子径/X線回折から算出した結晶子サイズ)が0.8〜2.0であることを特徴とする酸化チタン粒子粉末。
- 請求項1記載の酸化チタン粒子粉末において、球状ナノ構造体の平均粒径が50nm〜20μmであることを特徴とする酸化チタン粒子粉末。
- 請求項1又は2に記載の酸化チタン粒子粉末からなる光触媒。
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