Electrochemical Degradation of a Commercial Formulation of the Insecticide Pyriproxyfen Using Boron-Doped Diamond Anode
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-10-26 |
| Journal | Journal of The Electrochemical Society |
| Authors | Ruilianne P. A. dos Santos, Wesley D. F. Cruz, Keurison F. MagalhĆ£es, Danyelle Medeiros de AraĆŗjo, Mateus C. Medeiros |
| Institutions | Instituto Federal do Rio Grande do Norte, Universidade do Estado do Rio Grande do Norte |
| Citations | 8 |
Abstract
Section titled āAbstractāPyriproxyfen (PPF) is a juvenile hormone agonist used in agriculture and in combating Aedes aegypti. In this work, for the first time, a study of electrochemical oxidation (EO) of this insecticide is reported, which involved the degradation of a commercial formulation of PPF on boron-doped diamond (BDD) electrode. pH conditions influenced the process; after 360 min of electrolysis the COD removals were 88.1% (pH 3.0), 78.9% (pH 5.0), 65.5% (pH 7.0), 76.7% (pH 9.0) and 80.0% (pH 11.0). The increase in applied current density favored the COD removal and the S2O82- generation. At 20, 40 and 60 mA cm-2, the COD removal was 88.1%, 90.0% and 91.0% and the S2O82- production was 0.15, 0.26 and 0.35 mmol l-1, respectively. The COD removal process occurred via ā¢OH and other oxidants as S2O82ā and SO4-ā¢, and it was more efficient at the lowest current density (20 mA cm-2), which removed 88.1% COD with the lowest energy consumption (25.2 kWh m-3). Chromatographic (GC-MS and IC) data showed that the EO removed 37% PPF and formed short chain carboxylic acids as final organic by-products. EO with DDB seems to be an appropriate approach to be applied to degrade PPF in contaminated environmental samples.