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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1415 (July) (2013)  >  pp.563-567

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1415 (July) (2013)   pp.563 - 567 Next article>>

Hydrothermal synthesis of visible light-sensitive conduction band-controlled tungsten-doped titanium dioxide photocatalysts with copper ion-grafts

Lei NI1), Taiki KITTA2), Naoya KUMAGAI2), Bunsho OHTANI3), Kazuhito HASHIMOTO4), Hiroshi IRIE1)
1) Clean Energy Research Center, University of Yamanashi 2) Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi 3) Catalysis Research Center, Hokkaido University 4) Research Center for Advanced Science and Technology, The University of Tokyo

We prepared titanium dioxide (TiO2) photocatalysts sensitive to visible light, namely copper(II) [Cu(II)]-grafted tungsten and gallium co-doped TiO2 (Ti1−3xWxGa2xO2, x value is up to 0.12), based on the concept of narrowing the band gap of TiO2 by positively shifting its conduction band (CB) edge to a lower energy level and the catalytic multi-electron reduction of oxygen by Cu(I) ions [H. Yu, H. Irie, K. Hashimoto, J. Am. Chem. Soc., 132, 6898 (2010)]. Using this approach, the optical band-gap energy of TiO2 was decreased to ~2.8 eV, and band-gap narrowing was confirmed by measuring the action spectrum for oxygen evolution from water in the presence of iron ions [Fe(III), from FeCl3]. The Cu(II)-grafted Ti1−3xWxGa2xO2 (x = 0.12) photocatalyst effectively decomposed 2-propanol to carbon dioxide (CO2) via acetone under visible light (400–530 nm, 1 mW/cm2) with a CO2-generation rate of 0.30 µmol/h. Grafting Cu(II) ions after the hydrochloric acid treatment of Ti1−3xWxGa2xO2 (x = 0.12) increased the CO2-generation rate to 0.40 µmol/h.


Keyword:
Titanium dioxide, Photocatalysis, Conduction band, Tungsten doping, Visible-light sensitivity, Cupper ion, Multi-electron oxygen reduction

Received: April 25, 2013
Accepted: May 20, 2013 , Published online: July 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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