Efficient degradation of Methabenzthiazuron (cas 18691-97-9) photoinduced by decatungstate anion in water: Kinetics and mechanistic studies

Add time:09/25/2019    Source:sciencedirect.com

This study concerns the elimination of Methabenzthiazuron (cas 18691-97-9) (MBTU) photocatalysed by sodium decatungstate salts W10O324-.(DTA) in aqueous solution under irradiation at 365 nm. Ninety percentage of MBTU (10−4 M) is mineralised in the presence of the photocatalyst (2 × 10−4 M) after 7 d under exposure and the formation of nitrate, sulphate and ammonium confirmed this phenomenon. In aerated conditions, the photodegradation rate of MBTU clearly increased in the presence of DTA by a factor of 40 when compared to direct photolysis with ΦMBTU = 2.5 × 10−2 and t1/2 (MBTU) = 1.4 h. Oxygen appeared essential since 2 times inhibition of MBTU disappearance and the photocatalytic cycle interrupt were observed in the absence of oxygen. The degradation mechanism has been elucidated through the photoproducts identification by LC–ESI-MS analysis. Two processes were implied in the degradation: electron transfer and H atom abstraction reactions both involving W10O324-∗ excited state species. In the primary steps of the degradation, the aromatic ring hydroxylation was observed by electron transfer leading to OH-MBTU isomers and H atom abstraction reaction gave benzthiazuron and a supposed demethylated product. Secondary oxidations permitted the hydroxylation of both products.

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