Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (12): 1917-1921.doi: 10.3866/PKU.WHXB20071216

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Preparation, Characterization and Photo-catalytic Behavior of TiO2 Catalysts with Oxygen Vacancies

CHEN Qi-Yuan; TONG Hai-Xia; YIN Zhou-Lan; HU Hui-Ping; LI Jie; LIU Liang-Liang   

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2007-06-14 Revised:2007-08-27 Published:2007-11-30
  • Contact: CHEN Qi-Yuan

Abstract: The rutile TiO2 catalysts with oxygen vacancies were obtained under 927 ℃calcination using a mixed gas of saturation water vapor and H2 at 69 ℃. The catalysts were identified using X-ray diffraction (XRD), specific surface (BET), electron paramagnetic resonance spectroscopy (EPR), UV-Vis diffuse refraction spectroscopy (DRS), and X-ray photoelectron spectrum (XPS) measurements. The effect of calcination time on photocatalytic activity of TiO2 with different oxygen vacancies for O2 evolution was studied. The result indicated that appropriate oxygen vacancies could obviously improve the photocatalytic activity of rutile TiO2. The maximumO2 evolution speed of rutile TiO2 with oxygen vacancies was 222 μmol·L-1·h-1.

Key words: TiO2, Calcination, Oxygen vacancies, Photocatalytic activity


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