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http://hdl.handle.net/2445/147683
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DC Field | Value | Language |
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dc.contributor.author | Guelfi, Diego Roberta de Vieira | - |
dc.contributor.author | Ye, Zhihong | - |
dc.contributor.author | Gozzi, Fábio | - |
dc.contributor.author | De Oliveira, Silvio César | - |
dc.contributor.author | Machulek Jr., Amílcar | - |
dc.contributor.author | Brillas, Enric | - |
dc.contributor.author | Sirés Sadornil, Ignacio | - |
dc.date.accessioned | 2020-01-13T16:03:19Z | - |
dc.date.available | 2020-10-16T05:10:24Z | - |
dc.date.issued | 2018-10-16 | - |
dc.identifier.issn | 1383-5866 | - |
dc.identifier.uri | http://hdl.handle.net/2445/147683 | - |
dc.description.abstract | This article reports the electrochemical degradation of the herbicide metribuzin (MTZ) in sulfate medium by advanced oxidation processes like anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF). A boron-doped diamond (BDD) anode was combined with an air-diffusion cathode with ability to produce H2O2. Unprecedented overall combustion was feasible by all methods at a constant current density (j) ≥100.0 mA cm−2. The total organic carbon (TOC) removal achieved by AO-H2O2 was independent from pH within the range 3.0-9.0, whereas the oscillatory dependence of the pseudo-first-order MTZ decay rate constant with this variable was ascribed to adsorption on the BDD surface. In EF and PEF at pH 3.0, 0.50 mM Fe2+ was determined as optimum catalyst content and the MTZ removal showed two consecutive pseudo-first-order kinetic stages. These were related to the fast reaction of the target molecule with OH formed from Fenton's reaction, followed by a slower attack of physisorbed BDD(OH) onto Fe(III)-MTZ complexes. The effect of j and MTZ content on decay kinetics and TOC removal was examined. PEF was the best treatment due to the decomposition of photoactive intermediates by UVA radiation, yielding total mineralization of a 0.523 mM herbicide solution after 420 min of electrolysis at 100.0 mA cm−2. A thorough reaction pathway for MTZ degradation is proposed from the sixteen heteroaromatic by-products and three aliphatic molecules identified by GC-MS and LC-MS/MS. Oxalic and oxamic acids were detected as final carboxylic acids by ion-exclusion HPLC. | - |
dc.format.extent | 9 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1016/j.seppur.2018.10.029 | - |
dc.relation.ispartof | Separation and Purification Technology, 2018, vol. 211, p. 637-645 | - |
dc.relation.uri | https://doi.org/10.1016/j.seppur.2018.10.029 | - |
dc.rights | cc-by-nc-nd (c) Elsevier B.V., 2018 | - |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es | - |
dc.source | Articles publicats en revistes (Ciència dels Materials i Química Física) | - |
dc.subject.classification | Oxidació electroquímica | - |
dc.subject.classification | Depuració d'aigües residuals | - |
dc.subject.classification | Herbicides | - |
dc.subject.other | Electrolytic oxidation | - |
dc.subject.other | Purification of sewage | - |
dc.subject.other | Herbicides | - |
dc.title | Ensuring the overall combustion of herbicide metribuzin by electrochemical advanced oxidation processes. Study of operation variables, kinetics and degradation routes | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 682663 | - |
dc.date.updated | 2020-01-13T16:03:19Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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682663.pdf | 476.89 kB | Adobe PDF | View/Open |
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