Premium
Photocatalytic oxidation of nitrobenzene and phenylamine: Pathways and kinetics
Author(s) -
Palmisano Giovanni,
Loddo Vittorio,
Augugliaro Vincenzo,
Palmisano Leonardo,
Yurdakal Sedat
Publication year - 2007
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11137
Subject(s) - nitrobenzene , chemistry , photocatalysis , kinetics , mineralization (soil science) , aqueous solution , adsorption , photochemistry , catalysis , computational chemistry , organic chemistry , nitrogen , physics , quantum mechanics
The oxidation of nitrobenzene and phenylamine has been carried out by heterogeneous photocatalysis in aqueous suspensions of commercial TiO 2 . The photoreactivity results indicate that two reaction pathways occur in parallel with both substrates from the start of irradiation: partial oxidation to monohydroxy derivatives and mineralization. The first pathway involves the entering of radical HO • into the aromatic ring giving rise to monohydroxy derivatives, and the second one involves the total oxidation of the substrates to CO 2 . The partial oxidation of nitrobenzene produces all the three possible monohydroxy derivatives, while that of phenylamine only produces the ortho ‐ and para ‐isomers. The extent of adsorption in the dark was found to be about 8% mol for nitrobenzene, while the amounts were not detectable for phenylamine. The Langmuir‐Hinshelwood approach has been satisfactorily applied for modeling the photoreactivity results, and the values of the kinetic model parameters have been determined. © 2007 American Institute of Chemical Engineers AIChE J, 2007