Artículos de revistas
Effect Of Fe2+ On The Degradation Of The Pesticide Profenofos By Electrogenerated H2o2
Registro en:
Journal Of Electroanalytical Chemistry. Elsevier Science Sa, v. 783, p. 100 - 105, 2016.
1572-6657
1873-2569
WOS:000390627500014
10.1016/j.jelechem.2016.11.038
Autor
Rocha
Robson S.; Silva
Fernando L.; Valim
Ricardo B.; Barros
Willyam R. P.; Steter
Juliana R.; Bertazzoli
Rodnei; Lanza
Marcos R. V.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The purpose of the study was to evaluate the degradation of the organophosphate pesticide profenofos in acidic medium using a gas diffusion electrode (GDE) modified with 5.0% cobalt phthalocyanine (CoPc). The degradation of profenofos was based On oxidation by H2O2 electrogenerated in situ, and experiments were performed in the absence or presence of Fe(II) catalyst. Removal of the pesticide by anodic oxidation was minimal (similar to 20%), and reached only 36% when H2O2 was electrogenerated in the absence of catalyst. However, in the presence of 0.15 mmol L-1 FeSO4 center dot 7H(2)O (electro-Fenton reaction), profenofos removal attained 91% after 60 min of process tithe while total organic carbon (TOC) was reduced by 37%. Prolonged electrolysis. under similar electro-Fenton conditions showed that 100% profenofos removal could be achieved after 2 h and a 89.9% reduction in TOC could be attained after 4 h. Analysis by gas chromatography-mass spectrometry of the by-products formed during the process revealed the progressive degradation of profenofos to o- and p-benzoquinone, with subsequent rupture of the aromatic ring to form oxalic acid and, ultimately, CO2 and H2O. It is concluded that wastewater treatments involving H2O2 electrogeneration in a CoPc-modified GDE were effective in removing profenofos and TOC from commercial formulations of profenofos. (C) 2016 Elsevier B.V. All rights reserved. 783 100 105 Fundacao de Amparo a Pesquisa do Estado de sao Paulo (FAPESP) [2007/08314-3, 2009/15357-6, 2013/02762-5] Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [446436/2014-3] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)