Journal
CATALYSIS TODAY
Volume 129, Issue 1-2, Pages 16-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2007.06.045
Keywords
heterogeneous photocatalysis; benzonitrile; titanium dioxide
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The photocatalytic oxidation of benzonitrile was carried out in aqueous suspensions (pH 11) of commercial polycrystalline TiO2 (Merck and Degussa P25) irradiated by ultraviolet light. The rate of decomposition was dependent on the concentration of benzonitrile and followed a pseudo-first order kinetics. The complete mineralization of a 0.70 mM benzonitrile solution was achieved in ca. 8 h by using TiO2 Degussa P25, whereas the substrate was only partially mineralized even after 74 h of irradiation in the presence of TiO2 Merck. The final oxidation products were carbonate and nitrate. The appearance and the evolution of organic and inorganic intermediate species were also investigated and allowed to hypothesize the reaction pathways. (C) 2007 Elsevier B.V. All rights reserved.
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