Electrochemical and photo-assisted electrochemical treatment of the pesticide imidacloprid in aqueous solution by the Fenton process: effect of operational parameters

Electrochemical and photo-assisted electrochemical treatment of the pesticide imidacloprid in... The aim of this study was to compare the degradation efficiency (DE%) of imidacloprid as a model pesticide by electro-Fenton (EF) and photoelectro-Fenton processes (PEF) using undivided three-electrode electrochemical cell and UV irradiation in a batch mode. The potential of the working electrode (graphite) was fixed at −1.0 V versus the saturated calomel electrode. The selected operating conditions for treatment of imidacloprid (20 mg/L) were: pH 2.8, Fe2+ concentration of 0.36 mM and Na2SO4 concentration of 0.15 M as the background electrolyte, which produced a DE% of 59.23 and 80.49 % for EF and PEF after 180 min, respectively. Considerable synergistic effect between EF and UV processes was observed due to the regeneration of Fe2+ ions and more production of hydroxyl radicals (·OH). Besides, accumulation of the electro-generated H2O2 in the electrochemical system as the source of ·OH radicals was confirmed. Moreover, total organic carbon measurements under the optimized condition demonstrated that 50.73 and 67.15 % of the organic substrates were mineralized after 300 min of the treatment by the EF and PEF, respectively. Eventually, the experimental results revealed that the degradation and mineralization rates of the pesticide followed pseudo-first-order kinetics; however, the rate constants of the mineralization were lower than the degradation ones owing to the generated intermediates, which required more treatment during the processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Electrochemical and photo-assisted electrochemical treatment of the pesticide imidacloprid in aqueous solution by the Fenton process: effect of operational parameters

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Publisher
Springer Journals
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-2059-5
Publisher site
See Article on Publisher Site

Abstract

The aim of this study was to compare the degradation efficiency (DE%) of imidacloprid as a model pesticide by electro-Fenton (EF) and photoelectro-Fenton processes (PEF) using undivided three-electrode electrochemical cell and UV irradiation in a batch mode. The potential of the working electrode (graphite) was fixed at −1.0 V versus the saturated calomel electrode. The selected operating conditions for treatment of imidacloprid (20 mg/L) were: pH 2.8, Fe2+ concentration of 0.36 mM and Na2SO4 concentration of 0.15 M as the background electrolyte, which produced a DE% of 59.23 and 80.49 % for EF and PEF after 180 min, respectively. Considerable synergistic effect between EF and UV processes was observed due to the regeneration of Fe2+ ions and more production of hydroxyl radicals (·OH). Besides, accumulation of the electro-generated H2O2 in the electrochemical system as the source of ·OH radicals was confirmed. Moreover, total organic carbon measurements under the optimized condition demonstrated that 50.73 and 67.15 % of the organic substrates were mineralized after 300 min of the treatment by the EF and PEF, respectively. Eventually, the experimental results revealed that the degradation and mineralization rates of the pesticide followed pseudo-first-order kinetics; however, the rate constants of the mineralization were lower than the degradation ones owing to the generated intermediates, which required more treatment during the processes.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: May 6, 2015

References

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