Preparation of Titania Visible-Light Active Photocatalysts from  Titanyl Sulfate and Urea

Yasuhiro KINOSHITA; Hiroaki IMAI

doi:10.14852/jcersjsuppl.112.0.S1419.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 20-II

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S1419.0

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Host: The Ceramic Society of Japan

Co-host: 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.

Papers

Preparation of Titania Visible-Light Active Photocatalysts from Titanyl Sulfate and Urea

Yasuhiro KINOSHITA, Hiroaki IMAI

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Keywords: Photocatalyst, Visible light, Oxygen vacancy

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Abstract

We directly prepared anatase-type titania having visible-light photocatalytic activity by calcination of the mixture of titanyl sulfate and urea at 500°C. The property of titania photocatalysts was controlled by changing the mole ratio (R) of urea and titanyl sulfate in the mixture. A small amount of sulfur remained in the Ti-O lattice of anatase crystals produced at R<7. The photocatalytic activity of the sulfur-incorporated titania was relatively low under UV and visible illumination whereas the presence of sulfur narrowed the band gap. An increase in R removed sulfur from the lattice and induced an absorption band around 450 nm. Yellowish titania produced at R=15 showed high photocatalytic activity under UV and visible light irradiation. The high performance is tentatively ascribed to oxygen vacancy formed through desulfurization in the core of anatase particles.

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