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Title： Nanostructured TiO2 with oxygen vacancies for the degradation of organics
Time： 10:30, Thursday, Jun 22, 2017
Place： F307, School of Mechanical Engineering
Speaker： Associate Professor Chiaki Terashima, Photocatalysis International Research Center, Tokyo University of Science, Japan
Host： Shangguan Wenfeng

Abstract：
Titanium dioxide (TiO2) has been widely not only studied but also applied in industrial fields as photocatalyst because of its environmentally and economically advantages with high chemical stability, earth abundant and bio compatible properties. However, its large band-gap for the activity to only UV light region, and the high recombination rate of photogenerated electron and hole pairs have to be overcome to utilize effectively sunlight and to enhance the photocatalytic performance. Recent enormous efforts to overcome the above-mentioned drawbacks have resulted in the one-dimensional TiO2 nanotubes, nanofibers and nanorods to suppress the carrier recombination, and/or the heterojunction structure of TiO2 with another semiconductor to achieve larger separation of the photogenerated electron and hole, as well as the modification of TiO2 nanoparticles with gold clusters to expand the light conversion from UV to visible and near-infrared region. Here, we report simple and effective modification of nano-sized TiO2 materials by in-liquid plasma processing, which is a non-thermal plasma discharged in liquid. The present study focused to treat pristine TiO2 nanoparticles by the discharge in water-based solution and to investigate the material properties as well as the photocatalytic activities for decomposing organics. As a result of plasma treatment, we found the incorporation of oxygen vacancies on the sub-surface of TiO2 nanoparticles, and concluded that the origin of photocatalytic enhancement for acetaldehyde decomposition under fluorescent lamp attributed in the recombination suppression by the surface trap of oxygen vacancies near the nanoparticles surface.

Biography:
Chiaki Terashima was born in 1969 in Kanazawa, Ishikawa Prefecture, Japan. He received his Ph.D. degree (2003) in electrochemical analysis at Tokyo University under the supervision of Professor Akira Fujishima and Professor Kazuhito Hashimoto. His academic career started at Nagoya University as an associate professor (2010-2011) in Professor Osamu Takai’s group, and then moved to Tokyo University of Science in 2012. He is currently an associate professor at Photocatalysis International Research Center, Tokyo University of Science. His research interests are focused on photoelectrochemistry, diamond electrochemistry, and plasma processing in liquid.

Web Page: //www.rs.tus.ac.jp/pirc/en/member/index.html
E-mail: terashima@rs.tus.ac.jp