Degradation of diclofenac by electron beam irradiaton: Toxicitiy removal, by-products identification and effect of another pharmaceutical compound
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2018
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Journal of Environmental Chemical Engineering
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Water contamination by the anti-inflammatory drug diclofenac (DCF) is a consequence of its incomplete removal
in wastewater and sewage treatment plants, which is potentialized by interactions with other pharmaceutical
contaminants. In this context, electron beam irradiation (EBI) has been considered a clean technology for degrading
pharmaceutical compounds in water. Nevertheless, the identification of DCF by-products and their
correlation with biological recalcitrance and acute toxicity are poorly understood. In this study, the V. fischeri
test was used to characterize DCF toxicity in the absence and presence of fluoxetine (FLX), prior and after
irradiation. The results showed complete DCF degradation at low dose (5 kGy). DCF concentration followed
pseudo first-order decay with respect to the absorbed, with k0 = (1.33 ± 0.10) kGy−1 (DCF) and k0 =
(0.90 ± 0.12) kGy−1 (DCF+FLX). In contrast, negligible TOC removal was observed even at 7.5 kGy, with the
formation of recalcitrant, non-biodegradable by-products, as also suggested by the respirometry test. Despite
that, the toxicity of the DCF solution diminished from (19.6 ± 1.6) TU to (6.2 ± 2.3) TU, and from (6.8 ± 0.9)
TU to (3.1 ± 0.2) TU, in the absence and presence of FLX, respectively, after irradiation up to 5 kGy. Four of the
eleven by-products identified by direct-injection MS were easily degraded by EBI, and one (C13H14ClNO5) was
considered the least recalcitrant but the most toxic. Based on these results, a possible DCF degradation pathway
is proposed, involving hydroxylation and oxidation of aromatic rings, dehalogenation and C−N bond cleavage.
Como referenciar
TOMINAGA, FLAVIO K.; BATISTA, ANA P. dos S.; TEIXEIRA, ANTONIO C.S.C.; BORRELY, SUELI I. Degradation of diclofenac by electron beam irradiaton: Toxicitiy removal, by-products identification and effect of another pharmaceutical compound. Journal of Environmental Chemical Engineering, v. 6, n. 4, p. 4605-4611, 2018. DOI: 10.1016/j.jece.2018.06.065. Disponível em: http://repositorio.ipen.br/handle/123456789/29351. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.