Photocatalytic degradation of the insecticide acetamiprid on TiO2 catalyst

Journal of the Brazilian Chemical Society

Valéria J. Guzsvány²  János J. Csanádi²  Sanja D. Lazić¹  Ferenc F. Gaál² 

[1] ,Faculty of Sciences Department of Chemistry Novi Sad,Serbia

关键词: acetamiprid;    6-chloronicotinic acid;    degradation;    TiO2 photocatalysis;    water treatment;   

DOI  :  10.1590/S0103-50532009000100023

来源: SciELO

【 摘 要 】

The work is concerned with the photocatalytic degradation of acetamiprid, a widely used pyridine-based neonicotinoid insecticide, in UV-irradiated aqueous suspensions of O2/TiO2. The rate of degradation was studied by HPLC/DAD and UV spectrophotometry. It was found that the reaction in the investigated concentration range (0.5-2.0 mg cm-3) is of a pseudo-first order. The ¹H NMR analysis indicated that beside acetaldehyde, formic and acetic acid, pyridine-containing intermediates (e.g. 6-chloronicotinic acid) formed during the process. The HPLC/MS measurements also proved the presence of aromatic degradation intermediates. During the photocatalytic process the pH changed by even three units, from 5 to 2. In contrast to the photocatalytic results in the photolytic experimental conditions, acetamiprid appeared to be stable. To get a deeper insight into the complex photocatalytic process of acetamiprid, the photocatalytic degradation of 6-chloronicotinic acid, the detected pyridine-based degradation product, was also investigated.

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