Carbon-Doped Titanium Dioxide: Visible Light Photocatalysis and EPR Investigation


  • Elizaveta A. Konstantinova
  • Alexander I. Kokorin
  • Shanmugasundaram Sakthivel
  • Horst Kisch
  • Klaus Lips



Carbon-doped titania, Doped semiconductors, Epr, Photocatalytic activity


X-band EPR studies of a series of undoped and carbon-doped titania powders reveal the presence of a carbon-centered radical species. The concentration of spins is five to six orders of magnitude smaller than the total carbon content. Photoexcitation of the carbon-doped samples increases the corresponding EPR signal intensities both under ultraviolet and visible light irradiation. After illumination, the original intensity is restored within a few hours. Samples with higher carbon radical concentration reveal higher photocatalytic activity in degradation of 4-chlorophenol under visible light irradiation.




How to Cite

E. A. Konstantinova, A. I. Kokorin, S. Sakthivel, H. Kisch, K. Lips, Chimia 2007, 61, 810, DOI: 10.2533/chimia.2007.810.