Synthesis of nonstoichiometric Titanium oxides by Heat Switching in Microwave Reaction Field and Application for Visible Light-Photocatalyst

Reference Presenter Authors
06-016 Kunihiko Kato Kato, K.(Nagoya Institute of Technology); Vaucher, S.(The Swiss Federal Labo- ratories for Materials Science and Technology); Hong, J.(Nagoya Institute of Technology); Xin, Y.(Nagoya Institute of Technology); Shirai, T.(Nagoya Institute of Technology); Visible-light photocatalysis is a powerful technology for water purification, hydrogen production by water splitting, and reduction of CO2 under indoor illumination light 1-3. In this work, we show that sub-stoechiometric TiO2-x photocatalyst active in the visible range can be easily prepared by heating metallic titanium powder in a single-mode microwave reactor, a single and fast step requiring little energy. The metallic powder is selectively placed in the magnetic field location of the unloaded resonator. To prevent complete oxidation a very short heating jump is applied to commercially available Titanium powder. The microwave heating is performed using single-mode microwave applicator operating at 20 W and 2.45 GHz under mixed argon (Ar) and oxygen (O2) atmosphere. X-ray photoelectron spectroscopy, UV-Vis measurement and evaluation of photocatalytic activity under irradiation of both UV and visible light (reduction of CO2) is reported. For the evaluation of the photocatalytic properties, the outlet gas is sampled and analyzed using a gas chromatograph (GC) equipped with a flame ionized detector (FID). Obtained oxides exhibited high responsiveness for both visible light and photocatalytic activity towards reduction of CO2, which can be related to the presence of Ti3+ and Ti2+ on particle surface, and quite narrow band gap (2.05 eV).
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