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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photo-Fenton degradation of the insecticide esfenvalerate in aqueous medium using a recirculation flow-through UV photoreactor

Full text
Author(s):
Colombo, Renata [1] ; Ferreira, Tanare C. R. [1] ; Alves, Suellen A. [1] ; Lanza, Marcos R. V. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF HAZARDOUS MATERIALS; v. 198, p. 370-375, DEC 30 2011.
Web of Science Citations: 6
Abstract

The aim of the study was to evaluate the efficiencies of photo-Fenton (Fe(2+)) and (Fe(3+)) processes in the degradation of high-concentrations of esfenvalerate (in the form of aqueous emulsion of a commercial formulation) using a recirculation flow-through photoreactor irradiated with UV light from a 15W lamp (254 nm emission peak). The results obtained using a basic photo-Fenton (Fe(2+)) reaction (esfenvalerate 17 mg L(-1); ferrous sulphate 1 mM; hydrogen peroxide 25 mM; pH 2.5) were compared with those acquired when ferrioxalate (1, 3 or 5 mM) served as the iron source. Degradation of the active component of the commercial formulation was significantly greater, and the rate of oxidation more rapid, using a photo-Fenton (Fe(3+)) process compared with its Fe(2+) counterpart. The most efficient degradation of the insecticide (75% in 180 min) was achieved with a reaction mixture containing 5 mM ferrioxalate. However, under the same experimental conditions, degradation of pure esfenvalerate preceded much faster (99% in 60 min) and was 100% complete within 180 min reaction time. (C) 2011 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 07/04759-0 - Gas diffusion electrodes modified by organometallic compounds for hydrogen peroxide production
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Regular Research Grants
FAPESP's process: 07/08314-3 - Organophosphrous pesticides degradation (chlorpyrifos, methyl-parathion and profenofos) via electrochemical and advanced oxidation processes
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Regular Research Grants