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http://hdl.handle.net/2445/147662
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DC Field | Value | Language |
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dc.contributor.author | Oriol, Roger | - |
dc.contributor.author | Bernicola, M.P. | - |
dc.contributor.author | Brillas, Enric | - |
dc.contributor.author | Cabot Julià, Pere-Lluís | - |
dc.contributor.author | Sirés Sadornil, Ignacio | - |
dc.date.accessioned | 2020-01-13T15:13:19Z | - |
dc.date.available | 2021-05-09T05:10:21Z | - |
dc.date.issued | 2019-05-09 | - |
dc.identifier.issn | 0013-4686 | - |
dc.identifier.uri | http://hdl.handle.net/2445/147662 | - |
dc.description.abstract | Groundwater is one of the main freshwater resources on the Earth, but its contamination by NO3− and pesticides jeopardizes its suitability for consumption. In this work, the simultaneous electro-oxidation of insecticide imidacloprid (IMC) and electroreduction of NO3− in softened groundwater containing a large amount of Cl− has been addressed. The assays were carried out in a stirred undivided tank reactor containing either a boron-doped diamond (BDD) or IrO2 anode, and Fe cathode, which showed greater electrocatalytic activity than stainless steel to reduce NO3−. Comparative assays in simulated water mimicking the anionic composition of groundwater were made to assess the influence of natural organic matter (NOM) on the decontamination process. The BDD/Fe cell had much greater performance than the IrO2/Fe one, although the former produced larger amounts of ClO3− and ClO4−. In all cases, the NO3−, Cl− and IMC decays agreed with a (pseudo)-first-order kinetics. In the BDD/Fe cell, total NO3− removal was reached at j ≥ 10 mA cm−2 in softened groundwater, at similar rate in the presence and absence of IMC, but it was decelerated using the simulated matrix. The N-products formed upon NO3− electroreduction contributed to IMC degradation, but its decay was inhibited by NOM because of the partial consumption of oxidants like hydroxyl radical and active chlorine. Operating at 5 mA cm−2 for 240 min, total removal of the insecticide and 61.5% total organic carbon (TOC) decay were achieved, also attaining a low NO3− content that was suitable for humans. Eight heteroaromatic products were identified, allowing the proposal of a reaction sequence for IMC degradation in groundwater. | - |
dc.format.extent | 13 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier Ltd | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1016/j.electacta.2019.05.002 | - |
dc.relation.ispartof | Electrochimica Acta, 2019, vol. 317, p. 753-765 | - |
dc.relation.uri | https://doi.org/10.1016/j.electacta.2019.05.002 | - |
dc.rights | cc-by-nc-nd (c) Elsevier Ltd, 2019 | - |
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 | Nitrats | - |
dc.subject.classification | Hidrologia d'aigües subterrànies | - |
dc.subject.other | Electrolytic oxidation | - |
dc.subject.other | Nitrates | - |
dc.subject.other | Groundwater hydrology | - |
dc.title | Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 690522 | - |
dc.date.updated | 2020-01-13T15:13:19Z | - |
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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