Photocatalytic Properties of TiO2 Coated SiO2 Particles by Metal Alkoxide Processing
Semiconductor photocatalysts of TiO2/SiO2 composite particles were prepared by hydrolysis of titanium isopropoxide. The hydrolysis was performed in an ethyl alcohol solution in which spherical silica particles of micron order dimensions were supplied as a substrate for TiO2 deposion. A sub-micron me...
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| Published in | KAGAKU KOGAKU RONBUNSHU Vol. 21; no. 6; pp. 1039 - 1046 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
Tokyo
The Society of Chemical Engineers, Japan
1995
Kagaku Kōgaku Kyōkai |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0386-216X 1349-9203 |
| DOI | 10.1252/kakoronbunshu.21.1039 |
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| Abstract | Semiconductor photocatalysts of TiO2/SiO2 composite particles were prepared by hydrolysis of titanium isopropoxide. The hydrolysis was performed in an ethyl alcohol solution in which spherical silica particles of micron order dimensions were supplied as a substrate for TiO2 deposion. A sub-micron meters TiO2 layer was observed on the particle surface. These TiO2-coated silica particles were heat treated to form an anatase or a rutile crystal phase of TiO2. The photo-electrochemical deposition method was adopted to generate platinum metal dots on the TiO2. surface. The photocatalytic activity of the particles was assessed by photo-decomposition of methyl alcohol in aqueous solution. The results of decomposition showed that anatase type TiO2 of 0.25 μm thickness containing 0.75 wt% of deposited platinum exhibited sufficient activity. Separation of the suspended catalyst particles was easily achieved by simple filtration after the reaction. Therefore, this catalyst may be suitable for practical usage in large scale industrial operations. |
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| AbstractList | Semiconductor photocatalysts of TiO2/SiO2 composite particles were prepared by hydrolysis of titanium isopropoxide. The hydrolysis was performed in an ethyl alcohol solution in which spherical silica particles of micron order dimensions were supplied as a substrate for TiO2 deposion. A sub-micron meters TiO2 layer was observed on the particle surface. These TiO2-coated silica particles were heat treated to form an anatase or a rutile crystal phase of TiO2. The photo-electrochemical deposition method was adopted to generate platinum metal dots on the TiO2. surface. The photocatalytic activity of the particles was assessed by photo-decomposition of methyl alcohol in aqueous solution. The results of decomposition showed that anatase type TiO2 of 0.25 μm thickness containing 0.75 wt% of deposited platinum exhibited sufficient activity. Separation of the suspended catalyst particles was easily achieved by simple filtration after the reaction. Therefore, this catalyst may be suitable for practical usage in large scale industrial operations. |
| Author | Yokota, Toshiyuki Ohwada, Hiroto |
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| References | Sato, S. : “Photocatalitic Properties of TiO2 Powder”, Hyomen (Surface), 28,427-437 (1990) Anpo, M. and Y. Kubokawa : “Photocatalytic Reactions on Metal Oxides and Their Primary Processes”, Hyomen Kagaku (Surface Science), 4,200-211 (1983) Mita, K., M. Itami, M. Takahashi and H. Toyuki : “Preparation of Ruthenium-Platinum Catalysts Supported on TiO2-SiO2 and Their Photocatalytic Activities”, Kagaku to Kogyo (Science and Industry), 66,106-109 (1992) Yamaguti, K. and S. Sato : “Photolysis of Water over Pt/TiO2 Catalysts”, J. Chem. Soc. Jpn., 1984,258-263 (1984) Domen, K., Y. Sakata, A. Kudo, K. Maruya and T. Onishi : “The Photocatalytic Activity of a Platinized Titanium Dioxide Catalyst Supported over Silica”, Bull. Chem. Soc. Jpn., 61,359-362 (1988) Fujii, M., T. Kawai and S. Kawai : “Photochemical Reaction and Energy Conversion with Particulate Semiconductor”, Oyo Buturi (Applied Physics), 53,916-933 (1984) Nishimoto, S., B. Ohtani, A. Sakamoto and R. Kagiya : “Photocatalytic Activities of Titanium (IV) Oxide Prepared from Titanium (IV) Sulfate”, J. Chem. Soc. Jpn, 1984,246-252 (1984) Kubokawa, Y., K. Honda and Y. Saito, ed. : “Photocatalysts”, p 43-45, p 55-57, Asakura Shoten, Tokyo (1988) Mizuguchi, M. : “Photodegradation of Organic Compounds in Water with Titanium Dioxide Photocatalysts”, Master Thesis, Yamagata Univ. (1993) Kodama, S., H. Nakaya, M. Anpo and Y. Kubokawa : “A Common Factor Determining the Features of the Photocatalytic Hydrogenation and Isomerization of Alkenes over Ti-Si Oxides”, Bull. Chem. Soc. Jpn., 58, 3645-3646 (1985) Hisanaga, T. and K. Tanaka : “Effect of Crystal Structure of Titanium Oxide on Photocatalytic Degradation of Organic-halide-compound”, Mizushori Gijyutu, 34, 13-18 (1993) Sato, S. : “Factors Influencing the Photocatalytic Activities of Metal Oxide Semiconductors”, Shokubai (Catalyst), 30, 48-51 (1988) Kraeutler, B. and A. Bard : “Heterogeneous Photocatalytic Preparation of Supported Catalysts. Photodeposition of Platinum on TiO2 Powder and Other Substrates”, J. Am. Chem. Soc., 100, 4317-4318 (1978) Ueno, K., F. Minakami and T. Sodesawa, ed. : “Catalysts Preparation Using Metal Alkoxides”, p 292-320, p 435-452, ICP, Tokyo (1993) |
| References_xml | – reference: Yamaguti, K. and S. Sato : “Photolysis of Water over Pt/TiO2 Catalysts”, J. Chem. Soc. Jpn., 1984,258-263 (1984) – reference: Fujii, M., T. Kawai and S. Kawai : “Photochemical Reaction and Energy Conversion with Particulate Semiconductor”, Oyo Buturi (Applied Physics), 53,916-933 (1984) – reference: Mizuguchi, M. : “Photodegradation of Organic Compounds in Water with Titanium Dioxide Photocatalysts”, Master Thesis, Yamagata Univ. (1993) – reference: Sato, S. : “Photocatalitic Properties of TiO2 Powder”, Hyomen (Surface), 28,427-437 (1990) – reference: Kodama, S., H. Nakaya, M. Anpo and Y. Kubokawa : “A Common Factor Determining the Features of the Photocatalytic Hydrogenation and Isomerization of Alkenes over Ti-Si Oxides”, Bull. Chem. Soc. Jpn., 58, 3645-3646 (1985) – reference: Ueno, K., F. Minakami and T. Sodesawa, ed. : “Catalysts Preparation Using Metal Alkoxides”, p 292-320, p 435-452, ICP, Tokyo (1993) – reference: Domen, K., Y. Sakata, A. Kudo, K. Maruya and T. Onishi : “The Photocatalytic Activity of a Platinized Titanium Dioxide Catalyst Supported over Silica”, Bull. Chem. Soc. Jpn., 61,359-362 (1988) – reference: Sato, S. : “Factors Influencing the Photocatalytic Activities of Metal Oxide Semiconductors”, Shokubai (Catalyst), 30, 48-51 (1988) – reference: Kraeutler, B. and A. Bard : “Heterogeneous Photocatalytic Preparation of Supported Catalysts. Photodeposition of Platinum on TiO2 Powder and Other Substrates”, J. Am. Chem. Soc., 100, 4317-4318 (1978) – reference: Hisanaga, T. and K. Tanaka : “Effect of Crystal Structure of Titanium Oxide on Photocatalytic Degradation of Organic-halide-compound”, Mizushori Gijyutu, 34, 13-18 (1993) – reference: Kubokawa, Y., K. Honda and Y. Saito, ed. : “Photocatalysts”, p 43-45, p 55-57, Asakura Shoten, Tokyo (1988) – reference: Mita, K., M. Itami, M. Takahashi and H. Toyuki : “Preparation of Ruthenium-Platinum Catalysts Supported on TiO2-SiO2 and Their Photocatalytic Activities”, Kagaku to Kogyo (Science and Industry), 66,106-109 (1992) – reference: Anpo, M. and Y. Kubokawa : “Photocatalytic Reactions on Metal Oxides and Their Primary Processes”, Hyomen Kagaku (Surface Science), 4,200-211 (1983) – reference: Nishimoto, S., B. Ohtani, A. Sakamoto and R. Kagiya : “Photocatalytic Activities of Titanium (IV) Oxide Prepared from Titanium (IV) Sulfate”, J. Chem. Soc. Jpn, 1984,246-252 (1984) |
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| SubjectTerms | Anatase Composite Particles Metal Alkoxide Processing Photocatalyst Photoreaction Engineering Rutile Titanium Oxide |
| Title | Photocatalytic Properties of TiO2 Coated SiO2 Particles by Metal Alkoxide Processing |
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