主催: The Ceramic Society of Japan
共催: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.
Nitrogen-doped titania nanocrystals were prepared by “Homogeneous Precipitation-Solvothermal Process” in TiCl3-hexamethylenetetramine (C6H12N4) mixed solution. The phase composition, crystallinity, microstructure and specific surface area of titania greatly changed depending on pH and temperature. The titania powders prepared in TiCl3-hexamethylenetetramine solutions at pH 1-6 and 190°C for 2 h consisted of single phase of brookite and that prepared at pH 9 was single phase of rutile. All titania powders prepared in the present study were yellow and showed excellent visible light absorption property and photocatalytic ability for nitrogen monoxide destruction under irradiation of the visible light (λ>510 nm). The photocatalytic activity of brookite prepared at pH 1-6 was superior to that of rutile prepared at pH 9. The photocatalytic activity under irradiation of visible light (λ>510 nm) slightly decreased with increasing calcination temperature up to 700°C and then greatly decreased at 800°C.