2000 Fiscal Year Final Research Report Summary
Photolysis reaction of organic compounds by titanium dioxide/metal oxides lamination thin films
| Project/Area Number |
11650704
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Ibaraki National college of Technology |
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Principal Investigator |
ISAGO Takashi National college of Technology, Department of Chemistry and Material Engineering, Associate (Assistant) Professor, 物質工学科, 助教授 (70193232)
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| Project Period (FY) |
1999 – 2000
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| Keywords | titanium dioxide / photocatalyst / tin dioxide / indium oxide / photolysis / lamination thin film / super hydrophilicity |
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| Research Abstract |
Metal oxide films (of 10 oxides) were laminated on the photocatalytically active titanium dioxide (TiO_2) thin film, and the activity of photolysis reaction was tested. These thin films were made by sol-gel method using hydrolysis and poly-condensation reaction of metal-alkoxides of them, and the activity was tested for organic compounds (salicylic acid, orange II, bisphenol A, methylene blue) in aqueous solutions. Results obtained so far are as follows ;
1. Two component lamination thin films of TiO_2-SnO_2, TiO_2-In_2O_3 are homogeneous and very transparent, and the photocatalytic activity is larger than that of TiO_2 single thin film.
2. Three component lamination thin films of In_2O_2-TiO_2-SnO_2 are also homogeneous and very transparent, and the photocatalytic activity is larger than that of TiO_2 single thin film, similarly to the two component lamination thin films.
These are supposed to be owing to ; that by laminating SnO_2 or In_2O_3 which has the lower conduction bands than TiO_2, the conduction electrons caused by TiO_2 light absorption move quickly to these bands, so the recombination of electron and positive hole is prevented ; as well as their photocatalyst surface characteristics are different.
Besides, for SnO_2/TiO_2 lamination thin film, decrease in the water droplet contact angle was observed also on the SnO_2 thin film after light irradiation, and the super hydrophilicity was observed similarly to the TiO_2 thin film.
The results obtained so far will soon be presented to academic journals.
In the future, mechanism will be examined in detail.
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