Fe(III) Photoinduced and Q-TiO2 Photocatalysed Degradation of Napthalene: Comparison of Kinetics and Proposal of Mechanism

0181450 - UFCH-W 20020118 RIV CH eng J - Článek v odborném periodiku
Hykrdová, Lenka - Jirkovský, Jaromír - Mailhot, G. - Bolte, M.
Fe(III) Photoinduced and Q-TiO2 Photocatalysed Degradation of Napthalene: Comparison of Kinetics and Proposal of Mechanism.
Journal of Photochemistry and Photobiology A-Chemistry. Roč. 151, - (2002), s. 181-193. ISSN 1010-6030. E-ISSN 1873-2666
Grant CEP: GA ČR GA203/99/0763
Výzkumný záměr: CEZ:AV0Z4040901
Klíčová slova: photoinduced * photocatalysed * naphthalene
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 1.297, rok: 2002

Degradation of naphthalene was investigated in two systems producing hydroxyl radical: in homogeneous solution of Fe(III) Perchlorate and in heterogeneous colloidal solution of Q-TiO2. The Fe(III) photoinduced degradation of naphthalene approximately followed first order kinetics with rate constant strongly dependent on the content of most photoactive Fe(III) species, Fe(OH)(2+). In the case of the degradation photocatalysed by Q-TiO2, more complicated kinetics controlled by a charge-transfer surface complex with naphthalene degradation intermediates was observed. The primary degradation intermediates (2-formylcinnamaldehyde, 1,2-naphthoquinone, 1,4-naphthoquinone, 1-naphthol, 2-naphthol) were the same for both systems. The reaction mechanism of the degradation was proposed assuming the attack of hydroxyl radical followed by the addition of dioxygen, resulting in the direct opening of the aromatic ring.
Trvalý link: http://hdl.handle.net/11104/0001891