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DC Field | Value | Language |
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dc.contributor.author | Oriol, Roger | - |
dc.contributor.author | Brillas, Enric | - |
dc.contributor.author | Cabot Julià, Pere-Lluís | - |
dc.contributor.author | Cortina Pallàs, José Luis | - |
dc.contributor.author | Sirés Sadornil, Ignacio | - |
dc.date.accessioned | 2021-04-26T15:10:11Z | - |
dc.date.available | 2023-04-09T05:10:20Z | - |
dc.date.issued | 2021-04-09 | - |
dc.identifier.issn | 0013-4686 | - |
dc.identifier.uri | http://hdl.handle.net/2445/176708 | - |
dc.description.abstract | Groundwater is one of the main freshwater resources on Earth, but its contamination with NO3− and pesticides jeopardizes its viability as a source of drinking water. In this work, a detailed study of single electro-oxidation (EO) and electrodenitrification and paired EO/electrodenitrification processes has been undertaken with simulated and actual groundwater matrices containing 100 mg dm−3 NO3− and/or 5 mg dm−3 terbuthylazine pesticide. Galvanostatic electrolyses were made with 500 cm 3 of solutions at pH 4.0-10.5 and 250-1000 mA in tank reactors with a RuO2 or boron-doped diamond (BDD) anode and one or two Fe cathodes, all of them in the form of meshes. Most of NO3− removals agreed with a pseudo-first-order kinetics. In Cl−-free media, NH4+ predominated as electroreduction product. In chloride media, a greater amount of N-volatiles was determined alongside a slower electrodenitrification, especially with RuO2 due to the partial re-oxidation of electroreduction products like NH4+ by active chlorine. The pesticide decays were also fitted to a pseudo-first order kinetics, and its presence led to a smaller release of N-volatiles. Overall, BDD always favored the pesticide degradation thanks to the action of BDD(¿OH), whereas RuO2 was preferred for electrodenitrification under some conditions. The EO/electrodenitrification of groundwater was successful once the matrix was softened to minimize its hardness. The NO3− concentration was reduced below the limit established by the WHO. Overall, the BDD/Fe cell was more suitable than the RuO2/Fe cell because it accelerated the pesticide removal with a simultaneous high degree of NO3− electroreduction. However, it produced toxic chlorate and perchlo- rate. A final post-treatment with an anion exchange resin ensured a significant removal of both ions, thus increasing the viability of the electrochemical approach to treat this type of water. Chromatographic analyses revealed the formation of ten heteroaromatic products like desethyl-terbuthylazine and cyanuric acid, alongside oxalic and oxamic as final short-chain carboxylic acids. | - |
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.2021.138354 | - |
dc.relation.ispartof | Electrochimica Acta, 2021, vol. 383, p. 138354 | - |
dc.relation.uri | https://doi.org/10.1016/j.electacta.2021.138354 | - |
dc.rights | cc-by-nc-nd (c) Elsevier Ltd, 2021 | - |
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 | Hidrologia d'aigües subterrànies | - |
dc.subject.classification | Plaguicides | - |
dc.subject.other | Electrolytic oxidation | - |
dc.subject.other | Groundwater hydrology | - |
dc.subject.other | Pesticides | - |
dc.title | Paired electrochemical removal of nitrate and terbuthylazine pesticide from groundwater using mesh electrodes | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 711872 | - |
dc.date.updated | 2021-04-26T15:10:11Z | - |
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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