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Mechanism for Enhancement of Visible Light Response on Nitrogen-Doped TiO2 by Modification with Vanadium Species

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Photocatalytic activities of nitrogen-doped TiO2 (N-TiO2) will remarkably increase by surface modification with vanadium (+V) species for the decomposition of volatile organic compounds (VOCs) in the presence of O2 under visible light irradiation. Study on the electron spin resonance (ESR) shows that the vanadium (+V) species interacted with N-TiO2 surface is photo-reduced to form vanadium (+IV) in vacuum or in the presence of hole scavengers under visible light irradiation, and subsequently, it is re-oxidized into vanadium (+V) by O2. Furthermore, the concentration of visible light induced holes (┬ĚN radicals) on V-oxide/N-TiO2 is much higher than that on N-TiO2. Therefore, it is confirmed that the added vanadium species having oxidation states between +IV and +V that interact with surface N-TiO2 play significant roles as redox mediators in the effective charge separation of holes and electrons, which consequently brings about an enhancement of photocatalytic activity.
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Keywords: CHARGE SEPARATION; DECOMPOSITION; ESR; NITROGEN RADICAL; NITROGEN-DOPED TIO2; PHOTOCATALYST; REDOX MEDIATOR; VANADIUM; VISIBLE LIGHT; VOC

Document Type: Research Article

Publication date: 2010-01-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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