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Environmentally Benign Photocatalysts pp 113–132Cite as

Preparation of Titanium Oxide-Based Powders and Thin Films of High Photocatalytic Activities Using Solvothermal Methods

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Part of the book series: Nanostructure Science and Technology ((NST))

Abstract

Application of solvothermal methods to the synthesis of titanium-oxide based powders and thin films having high photocatalytic activities has been reviewed. Thermal treatment of titanium(IV) n-butoxide dissolved in alcohol under autogenous pressure (alcohothermal treatment) yielded nanocrystalline anatase-type titanium(IV) oxide (TiO2). Thermal treatment of oxobis(2,4-pentanedionato-O,O′)titanium in ethylene glycol in the presence of sodium acetate and a small amount of water yielded nanocrystalline brookite-type TiO2. Anatase TiO2 products were calcined at various temperatures and then used for photocatalytic mineralization of acetic acid in aqueous solutions under aerated conditions and dehydrogenation of 2-propanol under deaerated conditions. Almost all the anatase-type TiO2 samples showed the activities more than twice higher than those of representative active photocatalysts, Degussa P-25 and Ishihara ST01 in both reactions. A brookite TiO2 sample with improved crystallinity and sufficient surface area exhibited the hydrogen evolution rate almost equal to P-25. Solvothermal decomposition of titanium(IV) tert-butoxide in toluene in the presence of silica gel (SiO2) with continuous stirring yielded a TiO2–SiO2 composite. Solvothermally-synthesized TiO2–SiO2 composite exhibited higher photocatalytic performance in the oxidative removal of nitrogen oxides in air than that of the composite prepared by physical mixing or sol-gel method. Stable TiO2 sol was prepared from TiO2 powders synthesized by solvothermal method and transparent TiO2 thin films were successfully produced by dip-coating from the sol. These films exhibited much higher rate of malachite green decomposition compared with those prepared from a commercially available TiO2 sol.

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Acknowledgment

Some works shown here were supported by a Grant-in-Aid for Scientific Research on Priority Areas (417) from the Ministry of Education, Culture, Science, and Technology (MEXT) of Japan. We thank Nippon Aerosil, Ishihara Sangyo and Fuji Silycia Chemical for supplying Degussa P-25 powders, STS-01 sol and CARiACT Q-30 powders, respectively.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka, 577-8502, Japan

    Hiroshi Kominami

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  1. Hiroshi Kominami
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  2. Bunsho Ohtani
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Correspondence to Hiroshi Kominami .

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Editors and Affiliations

  1. Dept. Applied Chemistry, College of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka, 599-8531, Japan

    Masakazu Anpo

  2. Dept. Chemistry & Biochemistry, University of Notre Dame, Nieuwland Science Hall 251, Notre Dame, 46556-5670, Indiana, USA

    Prashant V. Kamat

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Kominami, H., Ohtani, B. (2010). Preparation of Titanium Oxide-Based Powders and Thin Films of High Photocatalytic Activities Using Solvothermal Methods. In: Anpo, M., Kamat, P. (eds) Environmentally Benign Photocatalysts. Nanostructure Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-0-387-48444-0_4

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