Efficient removal of sulcotrione and its formulated compound Tangenta registered in aqueous TiO2 suspension: Stability, photoproducts assessment and toxicity

The photocatalytic degradation of the herbicide sulcotrione (0.05mM) and its formulated compound Tangenta registered in aqueous suspensions of TiO2 Degussa P25 was examined as a function of the different operational parameters. The optimum of the catalyst loading was found to be 2.0mgmL-1 under UVA...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2015-11, Vol.138, p.988-994
Main Authors: Sojic, Daniela V, Orcic, Dejan Z, Cetojevic-Simin, Dragana D, Banic, Nemanja D, Abramovic, Biljana F
Format: Article
Language:English
Subjects:
Acetates
Assessments
Catalysts
Degradation
Formates
Photocatalysis
Titanium dioxide
Toxicity
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Summary:The photocatalytic degradation of the herbicide sulcotrione (0.05mM) and its formulated compound Tangenta registered in aqueous suspensions of TiO2 Degussa P25 was examined as a function of the different operational parameters. The optimum of the catalyst loading was found to be 2.0mgmL-1 under UVA light. In the first stage of the reaction, the photocatalytic degradation of sulcotrione alone and in Tangenta registered followed the pseudo-first order kinetics, in which the heterogeneous catalysis proceeds via [radicaldot] OH and holes. Further, it can be concluded that degradation rate of sulcotrione alone is about two times higher compared to formulated compound. The results showed that the disappearance of sulcotrione led to the formation of three organic intermediates and ionic byproducts (Cl-, SO4 2-, acetate and formate), whereas their mineralization was about 90% after 4h. Tentative photodegradation pathways were proposed and discussed. Also, there was no significant toxicity observed after the irradiation of sulcotrione solution and Tangenta registered formulation using TiO2 catalyst on three mammalian cell lines.
ISSN:0045-6535
DOI:10.1016/j.chemosphere.2014.12.042