Metolachlor photocatalytic degradation using TiO2 photocatalysts
Φόρτωση...
Ημερομηνία
Συγγραφείς
Sakkas, V. A.
Arabatzis, I. M.
Konstantinou, I. K.
Dimou, A. D.
Albanis, T. A.
Falaras, P.
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
The photocatalytic degradation of the herbicide metolachlor is Studied, using TiO2 photocatalysts. Apart from the titania aqueous dispersions, immobilized semiconductor thin films were used in order to evaluate their effectiveness. The films exhibit a rough, nanocrystalline configuration, ideal for heterogeneous processes. Additionally the thin films were silver modified to determine if noble metal nanoclusters affect the photocatalytic efficiency. The kinetics obtained demonstrated that powder Titania (t(1/2) = 21 min) was more efficient for the photocatalytic decomposition of metolachlor compared to pure titania thin film catalysts (t(1/2) = 52 min), while the presence of silver ions in TiO2 particles modification did not prove to promote the solar photocatalytic process. Intermediate products from the slurry system were isolated and identified by means of solid-phase extraction (SPE) coupled to gas chromatography-mass spectroscopy techniques (GC-MS). A proposed degradation pathway of metolachlor is presented, involving mainly hydroxylation and dealkylation reactions. In addition, toxicity studies based on the luminescence of the bacteria Vibrio fischeri before and after the photocatalytic treatment were performed. The results demonstrated that the transient intermediates formed were more toxic compared to parent compound. At low photocatalyst loads, the toxicity of the irradiated solution remains relatively high even though 88% of metolachlor is decomposed. (C) 2003 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
photocatalysis, tio2, films, metolachlor, silver modification, surface properties, toxicity, vibrio fischeri, solid-phase extraction, herbicide metolachlor, solar light, thin-films, water, photodegradation, products, alachlor, suspensions, metabolism
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000220939900006
http://ac.els-cdn.com/S0926337303005782/1-s2.0-S0926337303005782-main.pdf?_tid=a174bc9b7c360474823ae73428c5ec24&acdnat=1333023371_ec79ea90f792c486afddaf533e484dfb
http://ac.els-cdn.com/S0926337303005782/1-s2.0-S0926337303005782-main.pdf?_tid=a174bc9b7c360474823ae73428c5ec24&acdnat=1333023371_ec79ea90f792c486afddaf533e484dfb
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