%0 Journal Article
%T Photocatalytic degradation of the insecticide acetamiprid on TiO2 catalyst
%A Guzsv¨¢ny
%A Val¨¦ria J.
%A Csan¨¢di
%A J¨¢nos J.
%A Lazi£¿
%A Sanja D.
%A Ga¨¢l
%A Ferenc F.
%J Journal of the Brazilian Chemical Society
%D 2009
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532009000100023
%X 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.
%K acetamiprid
%K 6-chloronicotinic acid
%K degradation
%K tio2 photocatalysis
%K water treatment.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532009000100023&lng=en&nrm=iso&tlng=en