Effect of dissolved ozone or ferric ions on photodegradation of thiacloprid in presence of different TiO2 catalysts

0350961 - ÚFCH JH 2011 RIV NL eng J - Journal Article
Černigoj, U. - Štangar, U. L. - Jirkovský, Jaromír
Effect of dissolved ozone or ferric ions on photodegradation of thiacloprid in presence of different TiO2 catalysts.
Journal of Hazardous Materials. Roč. 177, 1-3 (2010), s. 399-406. ISSN 0304-3894. E-ISSN 1873-3336
Institutional research plan: CEZ:AV0Z40400503
Keywords : neonicotionoid pesticides * photocatalysis * ozonation
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.723, year: 2010

Combining TiO2 photocatalysis with inorganic oxidants (such as O-3 and H2O2) or transition metal ions (Fe3+, Cu2+ and Ag+) often leads to a synergic effect. Electron transfer between TiO2 and the oxidant is usually involved. Accordingly, the degree of synergy could be influenced by TiO2 surface area. With this in mind, the disappearance of thiacloprid, a neonicotinoid insecticide, was studied applying various photochemical AOPs and different TiO2 photocatalysts. In photocatalytic ozonation experiments, synergic effect of three different TiO2 photocatalysts was quantified. Higher surface area resulted in a more pronounced synergic effect but an increasing amount of TiO2 did not influence the degree of the synergy. This supports the theory that the synergy is a consequence of adsorption of ozone on the TiO2 surface. No synergy was observed in photocatalytic degradation of thiacloprid in the presence of dissolved iron(III) species performed under varied experimental conditions.
Permanent Link: http://hdl.handle.net/11104/0190817