Photocatalytic degradation of nitrobenzenes with combustion synthesized nano-TiO2
The photocatalytic degradation of nitrobenzene and substituted nitrobenzenes under UV exposure was investigated with combustion synthesized nano-TiO2 and commercial TiO2 catalyst, Degussa P-25. The experimental data indicated that the photodegradation kinetics was first order. The photocatalytic degradation rates were considerably higher when catalyzed with combustion synthesized TiO2 compared to that of Degussa P-25. The degradation rate coefficients followed the order: 1-chloro,2,4-dinitrobenzene ≃≃ 4-nitrophenol > 2-nitrophenol > 1-chloro,4-nitrobenzene > 3-nitrophenol > 2,4-dinitrophenol > 1-chloro,2-nitrobenzene > nitrobenzene > 1,3-dinitrobenzene. Plausible mechanisms and reasons for the observation of the above order are discussed.
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 178, Issue 1, 20 February 2006, Pages 1–7