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Title: Treating soil-washing fluids polluted with oxyfluorfen by sono-electrolysis with diamond anodes
Authors: Santos, Elisama Vieira dos
Sáez, Cristina
Cañizares, Pablo Canizares
Martínez-Huitle, Carmem A.
Rodrigo, Manuel Andres
Keywords: Oxyfluorfen;Sonolysis;Sono-electrolysis;Soil washing;Boron doped diamond;Electrolysis
Issue Date: Jan-2017
Publisher: Elsevier
Citation: SANTOS, E. V.;SÁEZ, C.; CAÑIZARES, P.; MARTÍNEZ-HUITLE, C.A.; RODRIGO, M.A.. Treating soil-washing fluids polluted with oxyfluorfen by sono-electrolysis with diamond anodes. Ultrasonics Sonochemistry, v. 34, p. 115-122, n. 2017. Disponível em:! Acesso em: 30 jul. 2020.
Portuguese Abstract: This works is focused on the treatment by sono-electrolysis of the liquid effluents produced during the Surfactant-Aided Soil-Washing (SASW) of soils spiked with herbicide oxyfluorfen. Results show that this combined technology is very efficient and attains the complete mineralization of the waste, regardless of the surfactant/soil radio applied in the SASW process (which is the main parameter of the soil remediation process and leads to very different wastes). Both the surfactant and the herbicide are completely degraded, even when single electrolysis is used; and only two intermediates are detected by HPLC in very low concentrations. Conversely, the efficiency of single sonolysis approach, for the oxidation of pollutant, is very low and just small changes in the herbicides and surfactant concentrations are observed during the tests carried out. Sono-electrolysis with diamond electrodes achieved higher degradation rates than those obtained by single sonolysis and/or single electrolysis with diamond anodes. A key role of sulfate is developed, when it is released after the electrochemical degradation of surfactant. The efficient catalytic effect observed which can be explained by the anodic formation of persulfate and the later, a sono-activation is attained to produce highly efficient sulfate radicals. The effect of irradiating US is more importantly observed in the pesticide than in the surfactant, in agreement with the well-known behavior of these radicals which are known to oxidize more efficiently aromatic compounds than aliphatic species
ISSN: 1350-4177
Appears in Collections:ECT - Artigos publicados em periódicos

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