Metolachlor photocatalytic degradation using TiO2 photocatalysts

Sakkas, VA; Arabatzis, IM; Konstantinou, IK; Dimou, AD; Albanis, TA; Falaras, P

dc.contributor.author	Sakkas, VA	en
dc.contributor.author	Arabatzis, IM	en
dc.contributor.author	Konstantinou, IK	en
dc.contributor.author	Dimou, AD	en
dc.contributor.author	Albanis, TA	en
dc.contributor.author	Falaras, P	en
dc.date.accessioned	2014-03-01T01:21:02Z
dc.date.available	2014-03-01T01:21:02Z
dc.date.issued	2004	en
dc.identifier.issn	0926-3373	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16045
dc.subject	Metolachlor	en
dc.subject	Photocatalysis	en
dc.subject	Silver modification	en
dc.subject	Surface properties	en
dc.subject	TiO2 films	en
dc.subject	Toxicity	en
dc.subject	Vibrio fischeri	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Alkylation	en
dc.subject.other	Degradation	en
dc.subject.other	Gas chromatography	en
dc.subject.other	Luminescence	en
dc.subject.other	Mass spectrometry	en
dc.subject.other	Thin films	en
dc.subject.other	Titanium compounds	en
dc.subject.other	Nanocluster affects	en
dc.subject.other	Solid-phase extraction (SPE)	en
dc.subject.other	Photocatalysis	en
dc.subject.other	Bacteria (microorganisms)	en
dc.subject.other	Vibrio	en
dc.subject.other	Vibrio fischeri	en
dc.title	Metolachlor photocatalytic degradation using TiO2 photocatalysts	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apcatb.2003.12.008	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.apcatb.2003.12.008	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	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.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Applied Catalysis B: Environmental	en
dc.identifier.doi	10.1016/j.apcatb.2003.12.008	en
dc.identifier.isi	ISI:000220939900006	en
dc.identifier.volume	49	en
dc.identifier.issue	3	en
dc.identifier.spage	195	en
dc.identifier.epage	205	en