JP5180745B2 - Visible light responsive photocatalyst and method for producing the same - Google Patents
Visible light responsive photocatalyst and method for producing the same Download PDFInfo
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- JP5180745B2 JP5180745B2 JP2008226198A JP2008226198A JP5180745B2 JP 5180745 B2 JP5180745 B2 JP 5180745B2 JP 2008226198 A JP2008226198 A JP 2008226198A JP 2008226198 A JP2008226198 A JP 2008226198A JP 5180745 B2 JP5180745 B2 JP 5180745B2
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- 239000011941 photocatalyst Substances 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 26
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 22
- 150000002497 iodine compounds Chemical class 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- -1 periodate ions Chemical class 0.000 claims description 6
- MLIWQXBKMZNZNF-KUHOPJCQSA-N (2e)-2,6-bis[(4-azidophenyl)methylidene]-4-methylcyclohexan-1-one Chemical compound O=C1\C(=C\C=2C=CC(=CC=2)N=[N+]=[N-])CC(C)CC1=CC1=CC=C(N=[N+]=[N-])C=C1 MLIWQXBKMZNZNF-KUHOPJCQSA-N 0.000 claims description 5
- XZXYQEHISUMZAT-UHFFFAOYSA-N 2-[(2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound CC1=CC=C(O)C(CC=2C(=CC=C(C)C=2)O)=C1 XZXYQEHISUMZAT-UHFFFAOYSA-N 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 229940107816 ammonium iodide Drugs 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 150000003058 platinum compounds Chemical class 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- ICIWUVCWSCSTAQ-UHFFFAOYSA-M iodate Chemical compound [O-]I(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-M 0.000 claims 6
- 150000001450 anions Chemical class 0.000 claims 5
- 239000011734 sodium Substances 0.000 claims 4
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims 2
- 229940005633 iodate ion Drugs 0.000 claims 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 claims 2
- 229940006461 iodide ion Drugs 0.000 claims 2
- KHIWWQKSHDUIBK-UHFFFAOYSA-M periodate Chemical compound [O-]I(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-M 0.000 claims 2
- 230000004298 light response Effects 0.000 claims 1
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 30
- 230000001699 photocatalysis Effects 0.000 description 14
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 12
- 235000009518 sodium iodide Nutrition 0.000 description 10
- JQWHASGSAFIOCM-UHFFFAOYSA-M sodium periodate Chemical compound [Na+].[O-]I(=O)(=O)=O JQWHASGSAFIOCM-UHFFFAOYSA-M 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 6
- 230000003373 anti-fouling effect Effects 0.000 description 4
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 description 4
- 239000001230 potassium iodate Substances 0.000 description 4
- 235000006666 potassium iodate Nutrition 0.000 description 4
- 229940093930 potassium iodate Drugs 0.000 description 4
- 230000001877 deodorizing effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000011697 sodium iodate Substances 0.000 description 3
- 235000015281 sodium iodate Nutrition 0.000 description 3
- 229940032753 sodium iodate Drugs 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZRDJERPXCFOFCP-UHFFFAOYSA-N azane;iodic acid Chemical compound [NH4+].[O-]I(=O)=O ZRDJERPXCFOFCP-UHFFFAOYSA-N 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- NALMPLUMOWIVJC-UHFFFAOYSA-N n,n,4-trimethylbenzeneamine oxide Chemical compound CC1=CC=C([N+](C)(C)[O-])C=C1 NALMPLUMOWIVJC-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229960004839 potassium iodide Drugs 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229940083599 sodium iodide Drugs 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- LLQPHQFNMLZJMP-UHFFFAOYSA-N Fentrazamide Chemical compound N1=NN(C=2C(=CC=CC=2)Cl)C(=O)N1C(=O)N(CC)C1CCCCC1 LLQPHQFNMLZJMP-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 229940045985 antineoplastic platinum compound Drugs 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-N iodic acid Chemical class OI(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-N 0.000 description 1
- 150000004694 iodide salts Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 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
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical class OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
本発明は可視光応答型酸化チタン光触媒とその製造方法に関する。 The present invention relates to a visible light responsive titanium oxide photocatalyst and a method for producing the same.
酸化チタンは、380ｎｍ以下の紫外線照射によって強い酸化力および超親水性を発現する光触媒材料として、脱臭、防汚、抗菌、親水化処理等への利用が進められている。しかし、室内のような弱紫外線環境下では、その光触媒活性はほとんど発現されないため、可視光下で強い酸化力を発現する可視光応答型光触媒が求められている。 Titanium oxide is being used for deodorization, antifouling, antibacterial treatment, hydrophilic treatment, and the like as a photocatalytic material that exhibits strong oxidizing power and super hydrophilicity when irradiated with ultraviolet rays of 380 nm or less. However, since the photocatalytic activity is hardly expressed under a weak ultraviolet environment such as indoors, a visible light responsive photocatalyst that expresses strong oxidizing power under visible light is required.
特許文献1には、酸化チタンなどの光触媒粒子の表面にハロゲン化白金を担持して、可視光下での光触媒活性を付与する技術が記載されている。しかしながら、使用する白金化合物が高価であるため、汎用性に乏しいという問題がある。 Patent Document 1 describes a technique of imparting photocatalytic activity under visible light by supporting platinum halide on the surface of photocatalytic particles such as titanium oxide. However, since the platinum compound to be used is expensive, there is a problem that the versatility is poor.
特許文献2には、窒素原子含有酸化チタンまたは硫黄原子含有酸化チタンの表面に3価の鉄化合物を担持して、可視光下でも高い光触媒活性を示す光触媒を得る技術が記載されている。しかしながら、脱臭能力や防汚能力に代表される該光触媒の光触媒活性は、紫外光応答型光触媒と比較すると、はるかに低く、利用者が脱臭作用や防汚作用を実感することは困難という問題がある。このことは、既存の可視光応答型光触媒に共通して言える問題であり、実用化への大きな障害となっている。 Patent Document 2 describes a technique for obtaining a photocatalyst exhibiting high photocatalytic activity even under visible light by supporting a trivalent iron compound on the surface of nitrogen atom-containing titanium oxide or sulfur atom-containing titanium oxide. However, the photocatalytic activity of the photocatalyst represented by the deodorizing ability and antifouling ability is much lower than that of the ultraviolet light responsive photocatalyst, and it is difficult for the user to realize the deodorizing action and the antifouling action. is there. This is a problem common to existing visible light responsive photocatalysts, and is a major obstacle to practical use.
そのため白金化合物に代表される高価な原料を使用せず、脱臭能力や防汚能力においてこれまで知られている可視光応答型酸化チタン光触媒よりも光触媒性能において優れる可視光応答型酸化チタン光触媒の提供が望まれる。 Therefore, it is possible to provide a visible light responsive titanium oxide photocatalyst that is superior in photocatalytic performance to visible light responsive titanium oxide photocatalysts that have been known so far in terms of deodorizing ability and antifouling ability without using expensive raw materials typified by platinum compounds. Is desired.
上記要望を満たすため、本発明は、少なくとも表面の一部分が無機ヨウ素化合物で被覆されていることを特徴とする可視光応答型酸化チタン光触媒粒子を提供する。 In order to satisfy the above-described demand, the present invention provides visible light-responsive titanium oxide photocatalyst particles characterized in that at least a part of the surface is coated with an inorganic iodine compound.
本発明はまた、本発明の可視光応答型酸化チタン光触媒粒子の製造法にも関し、該方法は、
（ａ）酸化チタン光触媒粒子を無機ヨウ素化合物水溶液に均一に分散させ、スラリーを得る工程、
（ｂ）得られたスラリーから水分を蒸発乾固する工程、および
（ｃ）生成物を粉砕する工程を含む。
The present invention also relates to a method for producing the visible light responsive titanium oxide photocatalyst particles of the present invention,
(A) a step of uniformly dispersing titanium oxide photocatalyst particles in an inorganic iodine compound aqueous solution to obtain a slurry;
(B) a step of evaporating and drying moisture from the obtained slurry, and (c) a step of pulverizing the product.
本発明において使用し得る無機ヨウ素化合物は、水溶性の無機ヨウ素化合物である。具体的にはヨウ化ナトリウム、ヨウ化カリウム、ヨウ化アンモニウム、ヨウ素酸ナトリウム、ヨウ素酸カリウム、ヨウ素酸アンモニウム、過ヨウ素酸ナトリウム、および過ヨウ素酸カリウムである。 The inorganic iodine compound that can be used in the present invention is a water-soluble inorganic iodine compound. Specifically, sodium iodide, potassium iodide, ammonium iodide, sodium iodate, potassium iodate, ammonium iodate, sodium periodate, and potassium periodate.
本発明は、酸化チタン光触媒粒子の表面に、無機ヨウ素化合物を担持することにより、可視光下で高い光触媒活性を発現する光触媒を提供する。 The present invention provides a photocatalyst exhibiting high photocatalytic activity under visible light by supporting an inorganic iodine compound on the surface of titanium oxide photocatalyst particles.
ヨウ素化合物を担持することによって、可視光下で光触媒活性を発現する機構は明らかではないが、ヨウ化物イオンおよび/あるいはヨウ素酸イオンおよび/あるいは過ヨウ素酸イオンが、酸化チタンと電子および/あるいは正孔の授受をすることにより、電子-正孔対の再結合を抑制する働きを果たしていると思われる。このため、可視光のような弱エネルギー下においても、高い光触媒活性を示すと考えられる。 Although the mechanism for developing photocatalytic activity under visible light by supporting an iodine compound is not clear, iodide ions and / or iodate ions and / or periodate ions can be combined with titanium oxide and electrons and / or positive ions. It seems that it plays the role of suppressing the recombination of electron-hole pairs by exchanging holes. For this reason, it is considered that high photocatalytic activity is exhibited even under weak energy such as visible light.
ヨウ素化合物の最適担持量は、ヨウ素化合物種によって異なる。ヨウ化ナトリウムを用いた場合、0.01〜30wt％の範囲であることが好ましく、また、5〜20wt％であることがより好ましい。さらに、10wt%であることが最も好ましい。一方、ヨウ化カリウムまたはアンモニウムを用いた場合、0.01〜40wt％の範囲であることが好ましく、また、5〜30wt％であることがより好ましい。さらに、20wt%であることが最も好ましい。ヨウ素酸ナトリウムまたはカリウムを用いた場合、0.01〜20wt％の範囲であることが好ましく、また、5wt%であることが最も好ましい。過ヨウ素酸ナトリウムまたはカリウムを用いた場合、0.01〜20wt％であることが好ましい。また、5wt％であることが最も好ましい。 The optimum loading amount of the iodine compound varies depending on the iodine compound species. When sodium iodide is used, it is preferably in the range of 0.01 to 30 wt%, more preferably 5 to 20 wt%. Furthermore, it is most preferable that it is 10 wt%. On the other hand, when potassium iodide or ammonium is used, it is preferably in the range of 0.01 to 40 wt%, more preferably 5 to 30 wt%. Furthermore, it is most preferable that it is 20 wt%. When sodium or potassium iodate is used, it is preferably in the range of 0.01 to 20 wt%, and most preferably 5 wt%. When sodium periodate or potassium is used, the content is preferably 0.01 to 20 wt%. Moreover, it is most preferable that it is 5 wt%.
使用し得るヨウ素化合物としては、各種ヨウ化物、ヨウ素酸塩、過ヨウ素酸塩を含む。例えば、ヨウ化ナトリウム、ヨウ化カリウム、ヨウ化アンモニウム、ヨウ素酸ナトリウム、ヨウ素酸カリウム、ヨウ素酸アンモニウム、過ヨウ素酸ナトリウム、過ヨウ素酸カリウムなどを使用することができる。 Examples of iodine compounds that can be used include various iodides, iodates, and periodates. For example, sodium iodide, potassium iodide, ammonium iodide, sodium iodate, potassium iodate, ammonium iodate, sodium periodate, potassium periodate and the like can be used.
酸化チタン光触媒粒子としては市販のものを使用することができる。結晶形はアナタース型でもルチル型でも良い。また、これまで知られている窒素や遷移金属をドープした可視光応答型酸化チタン光触媒を原料としても良い。可視光領域での光触媒性能がさらに増強される。 Commercially available titanium oxide photocatalyst particles can be used. The crystal form may be anatase or rutile. Further, a visible light responsive titanium oxide photocatalyst doped with nitrogen or a transition metal known so far may be used as a raw material. The photocatalytic performance in the visible light region is further enhanced.
実施例1
水100mlへヨウ化ナトリウム1gを溶解させ、これに市販のルチル形酸化チタン光触媒（MT-150A、テイカ株式会社）10gを添加し、攪拌したのち、120℃で乾燥することによって、可視光応答型光触媒（試料1）を得た。
Example 1
Dissolve 1 g of sodium iodide in 100 ml of water, add 10 g of a commercially available rutile titanium oxide photocatalyst (MT-150A, Teika Co., Ltd.), stir, and then dry at 120 ° C. A photocatalyst (sample 1) was obtained.
実施例2
ヨウ化ナトリウム1gに替えて、ヨウ化カリウム2gを使用する以外は、実施例1と同様にして、可視光応答型光触媒（試料2）を得た。
Example 2
A visible light responsive photocatalyst (sample 2) was obtained in the same manner as in Example 1 except that 2 g of potassium iodide was used instead of 1 g of sodium iodide.
実施例3
ヨウ化ナトリウム1gに替えて、ヨウ化アンモニウム2gを使用する以外は、実施例1と同様にして、可視光応答型光触媒（試料3）を得た。
Example 3
A visible light responsive photocatalyst (sample 3) was obtained in the same manner as in Example 1 except that 2 g of ammonium iodide was used instead of 1 g of sodium iodide.
実施例4
ヨウ化ナトリウム1gに替えて、ヨウ素酸カリウム0.5gを使用する以外は、実施例1と同様にして、可視光応答型光触媒（試料4）を得た。
Example 4
A visible light responsive photocatalyst (sample 4) was obtained in the same manner as in Example 1 except that 0.5 g of potassium iodate was used instead of 1 g of sodium iodide.
実施例5
ヨウ化ナトリウム1gに替えて、過ヨウ素酸ナトリウム0.5gを使用する以外は、実施例1と同様にして、可視光応答型光触媒（試料５）を得た。
Example 5
A visible light responsive photocatalyst (sample 5) was obtained in the same manner as in Example 1 except that 0.5 g of sodium periodate was used instead of 1 g of sodium iodide.
実施例6
ヨウ化ナトリウム1gに替えて、過ヨウ素酸カリウム0.5gを使用する以外は、実施例1と同様にして、可視光応答型光触媒（試料６）を得た。
Example 6
A visible light responsive photocatalyst (sample 6) was obtained in the same manner as in Example 1 except that 0.5 g of potassium periodate was used instead of 1 g of sodium iodide.
実施例7
25％硫酸チタン水溶液400mlへアンモニア水を添加し、pH9.0に調整することにより、白色析出物を含むスラリーを得た。得られた白色析出物を濾取し、空気中、120℃で乾燥したのち、空気中、400℃で焼成することにより、窒素ドープ酸化チタンを得た。次いで、水100mlへヨウ化ナトリウム1gを溶解させ、これに上記窒素ドープ酸化チタン10gを添加し、攪拌したのち、120℃で乾燥することによって、可視光応答型光触媒（試料7）を得た。
Example 7
Ammonia water was added to 400 ml of a 25% titanium sulfate aqueous solution and adjusted to pH 9.0 to obtain a slurry containing white precipitates. The obtained white precipitate was collected by filtration, dried in air at 120 ° C., and then baked in air at 400 ° C. to obtain nitrogen-doped titanium oxide. Next, 1 g of sodium iodide was dissolved in 100 ml of water, 10 g of the above nitrogen-doped titanium oxide was added thereto, stirred, and then dried at 120 ° C. to obtain a visible light responsive photocatalyst (sample 7).
比較例1
市販のアナタース形酸化チタン光触媒（AMT-100、テイカ株式会社）を、紫外光応答型光触媒（試料8）として光触媒活性の評価に用いた。
Comparative Example 1
A commercially available anatase-type titanium oxide photocatalyst (AMT-100, Teika Co., Ltd.) was used as an ultraviolet light-responsive photocatalyst (sample 8) for evaluation of photocatalytic activity.
可視光下における光触媒活性評価：
光触媒粉末0.5gを、800ppmアセトアルデヒドガス3000mlが封入されたガスバックへ入れ、暗所で15時間保持静置し、吸着飽和状態とした。その後、蛍光灯を用いて光照射し、任意の時間毎にアセトアルデヒド濃度を測定した。アセトアルデヒド濃度は、光音響マルチガスモニタ（1312型、INNOVA）を用いて測定した。評価結果を表1に示す。
なお、光触媒活性の高低を示す指標として、ガス減少速度定数を以下の式より算出した。
Photocatalytic activity evaluation under visible light:
0.5 g of photocatalyst powder was put into a gas bag filled with 3000 ml of 800 ppm acetaldehyde gas, and kept in a dark place for 15 hours to be in an adsorption saturated state. Thereafter, light was irradiated using a fluorescent lamp, and the acetaldehyde concentration was measured every arbitrary time. The acetaldehyde concentration was measured using a photoacoustic multi-gas monitor (type 1312, INNOVA). The evaluation results are shown in Table 1.
The gas reduction rate constant was calculated from the following equation as an index indicating the photocatalytic activity level.
光照射条件は、試料を４０ワット蛍光灯２本の直下２５ｃｍの距離に置いた。この時の照度は８０００ルクスである。 As for the light irradiation conditions, the sample was placed at a distance of 25 cm immediately below two 40-watt fluorescent lamps. The illuminance at this time is 8000 lux.
ガス減少速度定数ｋ（h-1） ： ｋｔｘ＝ln（C0/Cx）
tx：光照射時間（h）、 C0：暗所吸着後のガス濃度（ppm）、
Cx：所定光照射時間後のガス濃度（ppm）
Gas decrease rate constant k (h −1 ): kt x = ln (C 0 / C x )
t x : Light irradiation time (h), C 0 : Gas concentration (ppm) after adsorption in the dark,
Cx: Gas concentration (ppm) after a predetermined light irradiation time
Claims (4)
（ｂ）得られたスラリーから水分を蒸発乾固する工程、および
（ｃ）生成物を粉砕する工程
を含むことを特徴とする請求項１の可視光応答型酸化チタン光触媒の製造法（ただし、前記陰イオンの源は無機ヨウ素化合物であり、かつ、非白金化合物に限る。）。 (A) A step of uniformly dispersing titanium oxide photocatalyst particles in an aqueous solution containing at least one anion selected from iodide ion, iodate ion and periodate ion to obtain a slurry;
The method for producing a visible light responsive titanium oxide photocatalyst according to claim 1 , comprising: (b) a step of evaporating and drying water from the obtained slurry; and (c) a step of pulverizing the product . (The source of the anion is an inorganic iodine compound and is limited to a non-platinum compound) .
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