Photocatalytic transformation of flufenacet over TiO(2) aqueous suspensions: Identification of intermediates and the mechanism involved
Φόρτωση...
Ημερομηνία
Συγγραφείς
Sakkas, V. A.
Calza, P.
Vlachou, A. D.
Medana, C.
Minero, C.
Albanis, T.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Applied Catalysis B-Environmental
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
In order to exploit the efficiency of titania suspensions in photocatalysis for the degradation of the herbicide flufenacet, chemometric optimization tools were employed, such as response surface methodology and experimental design. The aqueous samples were irradiated under a variety of experimental conditions with different amounts of catalyst (TiO(2)), electron acceptor (H(2)O(2)) as well as pH. Results indicated that the degradation efficiency of the herbicide in the experimental domain investigated was mainly affected by the concentration of H(2)O(2), followed by TiO(2), pH, as well as their interaction effects. Additionally, the phototransformation products formed during the photocatalytic process were investigated and characterized by means of HPLC/HRMS. The photocatalysed transformation of flufenacet proceeds through the formation of thirty-two (32) products, involving reactions of mono- and dihydroxylation, dealkylation, detachment of the thiadiazole ring, defluorination on the benzene ring followed by the detachment of the latter ring. The thiadiazole ring appears to be involved in the process to a lesser extent and only as a secondary path. The measurement of acute toxicity, evaluated using the Vibrio fischeri bacteria test, showed that the transformation of flufenacet proceeds through the formation of compounds more toxic than the parent molecule. Although the identified intermediates were easily degraded and within two hours of irradiation were completely disappeared, mineralization was much slower and complete formation of CO(2) and inorganic constituents was only achieved after 24 h of irradiation. (C) 2011 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
photocatalysis, tio(2), experimental design, mineralization, toxicity, flufenacet, titanium-dioxide suspensions, experimental-design, degradation, water, pesticides, fate
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000297093500029
http://ac.els-cdn.com/S0926337311004243/1-s2.0-S0926337311004243-main.pdf?_tid=a4957eda4b7cffc58c153e6d5729d71a&acdnat=1333023362_33830c6c0cebcc2485b037b508597202
http://ac.els-cdn.com/S0926337311004243/1-s2.0-S0926337311004243-main.pdf?_tid=a4957eda4b7cffc58c153e6d5729d71a&acdnat=1333023362_33830c6c0cebcc2485b037b508597202
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας