Application of the response surface and desirability design to the Lambda-cyhalothrin degradation using photo-Fenton reaction

Autor(es)

Colombo, Renata ^[1] ; Ferreira, Tanare C. R. ^[1] ; Alves, Suellen A. ^[1] ; Carneiro, Renato L. ^[2] ; Lanza, Marcos R. V. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Environmental Management; v. 118, p. 32-39, MAR 30 2013.
• Citações Web of Science: 18

Resumo

Lambda-cyhalothrin is a potent pyrethroid insecticide used widely in pest management. Detectable levels of the pyrethroid in agricultural watersheds are potentially toxic to aquatic organisms. There is little information in the scientific literature about degradation in aqueous media of the Lambda-cyhalothrin by Advanced Oxidative Process. A mathematical approach for the degradation of this compound has not yet been fully explored ... The Central composite design (CCD) and response surface method (RSM) were applied to evaluate and optimize the interactive effects of two operating variables. The initial dosages of H2O2 and Fe2+ on photo-Fenton degradation of an aqueous solution of Lambda-cyhalothrin in a recirculation flow-through UV photoreactor were used. The remaining concentration of Lambda-cyhalothrin (y(1)) and the percentage removal of total organic carbon (y(2)) were the monitored factors since they are dependent parameters of y(1) and y(2). According to analysis of variances (ANOVA) results, two proposed models can be used to navigate the design space with regression coefficient R-2 - 0.834 and 0.843 for y(1) and y(2), respectively. A multi-response optimization procedure, based on the global desirability of the factors, was performed to establish the best concentrations of hydrogen peroxide and ferrous sulfate that would allow the most efficient degradation of Lambda-cyhalothrin concomitant with a maximal removal of total organic carbon. The global desirability surface revealed that 0.295 mmol L-1 of ferrous sulfate and 3.85 mmol L-1 of hydrogen peroxide were close to the optimum conditions to satisfy both factors simultaneously using minimal amounts of reagents. These photo-Fenton conditions promoted 100% of Lambda-cyhalothrin degradation and 79.83% TOC removal (mineralization) in 120 min of reaction time. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/08314-3 - Degradação de pesticidas organofosforados (clorpirifós, paration-metílico e profenofós) via processos eletroquímicos / processos oxidativos avançados
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/04759-0 - ESTUDO DE ELETRODOS DE DIFUSÃO GASOSA (EDG) MODIFICADOS COM CATALISADORES ORGANOMETÁLICOS PARA A ELETROGERAÇÃO DE H2O2 in situ
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/16520-5 - Aplicação de métodos quimiométricos de calibração e resolução multivariada de curvas em espectroscopia Raman para análise qualitativa, quantitativa e de polimorfismo em fármacos
• Beneficiário: Renato Lajarim Carneiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular