JP3908717B2 - 大気汚染物質の除去方法 - Google Patents
大気汚染物質の除去方法 Download PDFInfo
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- JP3908717B2 JP3908717B2 JP2003375294A JP2003375294A JP3908717B2 JP 3908717 B2 JP3908717 B2 JP 3908717B2 JP 2003375294 A JP2003375294 A JP 2003375294A JP 2003375294 A JP2003375294 A JP 2003375294A JP 3908717 B2 JP3908717 B2 JP 3908717B2
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- titanium oxide
- oxide precursor
- titanium
- aqueous solution
- air pollutants
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- 239000000809 air pollutant Substances 0.000 title claims description 31
- 231100001243 air pollutant Toxicity 0.000 title claims description 31
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 145
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 106
- 239000002243 precursor Substances 0.000 claims description 69
- 239000013078 crystal Substances 0.000 claims description 47
- 239000007864 aqueous solution Substances 0.000 claims description 40
- 230000001699 photocatalysis Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 25
- 229910052719 titanium Inorganic materials 0.000 claims description 22
- 239000010936 titanium Substances 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 20
- 230000002378 acidificating effect Effects 0.000 claims description 19
- 239000011941 photocatalyst Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 claims description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000003915 air pollution Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000002552 dosage form Substances 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 244000052616 bacterial pathogen Species 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 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 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 244000052769 pathogen Species 0.000 description 2
- 238000002459 porosimetry Methods 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- -1 titanium oxoacid salts Chemical class 0.000 description 2
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 2
- 229910000348 titanium sulfate Inorganic materials 0.000 description 2
- UBZYKBZMAMTNKW-UHFFFAOYSA-J titanium tetrabromide Chemical compound Br[Ti](Br)(Br)Br UBZYKBZMAMTNKW-UHFFFAOYSA-J 0.000 description 2
- XROWMBWRMNHXMF-UHFFFAOYSA-J titanium tetrafluoride Chemical compound [F-].[F-].[F-].[F-].[Ti+4] XROWMBWRMNHXMF-UHFFFAOYSA-J 0.000 description 2
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 2
- NLPMQGKZYAYAFE-UHFFFAOYSA-K titanium(iii) fluoride Chemical compound F[Ti](F)F NLPMQGKZYAYAFE-UHFFFAOYSA-K 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 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
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 231100000676 disease causative agent Toxicity 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-N iodic acid Chemical class OI(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- ZEIWWVGGEOHESL-UHFFFAOYSA-N methanol;titanium Chemical compound [Ti].OC.OC.OC.OC ZEIWWVGGEOHESL-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 150000002896 organic halogen compounds Chemical class 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- CEOCDNVZRAIOQZ-UHFFFAOYSA-N pentachlorobenzene Chemical compound ClC1=CC(Cl)=C(Cl)C(Cl)=C1Cl CEOCDNVZRAIOQZ-UHFFFAOYSA-N 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- 235000011118 potassium hydroxide Nutrition 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- HKJYVRJHDIPMQB-UHFFFAOYSA-N propan-1-olate;titanium(4+) Chemical compound CCCO[Ti](OCCC)(OCCC)OCCC HKJYVRJHDIPMQB-UHFFFAOYSA-N 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- GROMGGTZECPEKN-UHFFFAOYSA-N sodium metatitanate Chemical compound [Na+].[Na+].[O-][Ti](=O)O[Ti](=O)O[Ti]([O-])=O GROMGGTZECPEKN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Catalysts (AREA)
Description
しかしながら、アナタース型結晶とルチル型結晶の比率が制御された酸化チタンを工業的に製造するための方法については知られていない。
純水で製造した氷を粉砕して容器に入れ、この容器内に四塩化チタン(TiCl4)500gを添加して粉砕した氷と混合し、更に容器内に純水を添加して溶液全体を1,000mlとし、四塩化チタン水溶液(溶液A)を調製した。
また、28wt%-アンモニア水を同量の純水で希釈し、14wt%-アンモニア水(溶液B)を調製した。
続いて、反応容器中には撹拌下に上記溶液Bの710mlを一度に添加した。得られた溶液はpH値8.5となり、この操作により溶液中に酸化チタン前駆体が析出し、溶液はスラリー状になった。
得られた各実験例1〜21の湿潤ケーキを120℃で3時間乾燥し、各実験例1〜21の酸化チタン前駆体を得た。
アナタース型結晶含有率(重量%)=100/[1+1.265(IRu/IAn)]……(1)
これらの結果を表1に示す。
〔NO光触媒分解反応試験(気相試験)〕
また、上記各酸化チタン粉末について、下記のNO光触媒分解反応試験(気相試験)を行い、光触媒活性を調べた。
耐熱性と光透過性に優れた石英ガラス製反応セル(容量:73.3cm3)内に上記各実験例1〜21の光触媒酸化チタン100mgを入れ、大気中で吸着水の多くが脱離する523Kまで徐々に昇温させ、更に723Kまで昇温させた後、同温度で3時間排気させた。酸素処理は液体窒素トラップで精製した酸素を接触部に20Torr以上導入し、723Kで2時間行った。その後、室温に戻し、再びゆっくりと473Kまで昇温させ、同温度で2時間排気した。
結果を表1に示す。
Claims (8)
- チタン含有酸性水溶液に塩基性水溶液を添加して水酸基を有する酸化チタン前駆体を製造し、次いでこの酸化チタン前駆体を高温で焼成して光触媒用酸化チタンを製造するに際し、上記酸化チタン前駆体の製造時にはチタン含有酸性水溶液に塩基性水溶液を添加して水酸基を有する酸化チタン前駆体を析出させた後、得られた酸化チタン前駆体スラリー中に、酸性の原料水溶液を添加してpH値を酸化チタン前駆体の溶解領域に降下させると共に原料を追加投入する操作と、この操作で得られたチタン含有酸性水溶液に塩基性水溶液を添加してpH値を酸化チタン前駆体の析出領域に上昇させる操作とからなるpHスイング操作を少なくとも3回以上7回以下の範囲で繰り返すと共に、焼成後に光触媒として利用するのに必要な形状に二次加工し、また、この酸化チタン前駆体の焼成時には焼成温度500℃以上600℃以下の条件下で行い、上記酸化チタン前駆体製造時のpHスイング操作の回数と酸化チタン前駆体焼成時の温度及び時間とを制御することにより製造され、アナタース型結晶(An)とルチル型結晶(Ru)との比率(An/Ru)が1.7〜11.5の範囲内であって、BET表面積が42m2/g以上である光触媒用酸化チタンを用い、大気中の大気汚染物質を酸化分解することを特徴とする大気汚染物質の除去方法。
- 酸化チタン前駆体の溶解領域のpH値が3.5以下であり、酸化チタン前駆体の析出領域のpH値が7以上である請求項1に記載の大気汚染物質の除去方法。
- チタン含有酸性水溶液が四塩化チタン水溶液である請求項1又は2に記載の大気汚染物質の除去方法。
- 酸化チタン前駆体の製造時の二次加工が、焼成後に光触媒として利用するのに必要な形状に成形する成形加工である請求項1〜3のいずれかに記載の大気汚染物質の除去方法。
- 酸化チタン前駆体の製造時の二次加工が、大気に曝される基材に酸化チタン前駆体を固定して行う固定加工である請求項1〜4のいずれかに記載の大気汚染物質の除去方法。
- 固定加工が、溶液中に酸化チタン前駆体を分散して調製した塗布液を塗布した後に乾燥する塗布操作により行なわれる請求項5に記載の大気汚染物質の除去方法。
- 光触媒酸化チタンに供する光源が、太陽光又はバンド・ギャップより大きなエネルギーを持つ人工的光源である請求項1〜6のいずれかに記載の大気汚染物質の除去方法。
- 大気中の大気汚染物質が、NOX、SOX、有害有機化合物、悪臭物質、及び有機体からなる群より選ばれた1種又は2種以上である請求項1〜7のいずれかに記載の大気汚染物質の除去方法。
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