Comparative Kinetic Study of Atrazine Photodegradation in Aqueous Fe(ClO4)3 Solutions and TiO2 Suspensions

0181626 - UFCH-W 20030065 RIV NL eng J - Journal Article
Krýsová, Hana - Jirkovský, Jaromír - Krýsa, J. - Mailhot, G. - Bolte, M.
Comparative Kinetic Study of Atrazine Photodegradation in Aqueous Fe(ClO4)3 Solutions and TiO2 Suspensions.
Applied Catalysis B - Environmental. Roč. 40, č. 1 (2003), s. 1-12. ISSN 0926-3373. E-ISSN 1873-3883
R&D Projects: GA MŠMT ME 396; GA ČR GA203/99/0763
Institutional research plan: CEZ:AV0Z4040901
Keywords : atrazine * photodegradation * TiO2
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.476, year: 2003

Kinetics of oxidative photodegradation of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) in both homogeneous solutions of Fe(ClO4)(3) and heterogeneous suspensions of TiO2 were investigated and compared. Besides laboratory experiments in a batch-mode photoreactor with monochromatic irradiation at 365 nm, solar radiation was applied. Hydrolysis and oligomerization processes occurring in aqueous solutions of Fe(ClO4)(3) strongly affected the degradation kinetics. Initial reaction rates decreased with age of the solutions reflecting decreased concentration of the most photoactive complex [Fe(OH)(H2O)(5)](2+). Comparing freshly prepared solutions of Fe(ClO4)(3) with aqueous slurry of TiO2 P25 (Degussa), the photodegradation rates were similar. Colloidal suspensions of quantum-sized particles Q-TiO2 were less photoactive than the P25 slurry. Doping of the quantum-sized particles by Fe3+ caused a red shift of the semiconductor absorption but influenced the photocatalytic.
Permanent Link: http://hdl.handle.net/11104/0078162