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Paired electrochemical removal of nitrate and terbuthylazine pesticide from groundwater using mesh electrodes
dc.contributor.author | Oriol López, Roger |
dc.contributor.author | Brillas Coso, Enrique |
dc.contributor.author | Cabot, Pere-Lluis |
dc.contributor.author | Cortina Pallás, José Luís |
dc.contributor.author | Sirés Sadornil, Ignasi |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química |
dc.date.accessioned | 2021-11-11T11:17:18Z |
dc.date.available | 2023-07-01T00:32:04Z |
dc.date.issued | 2021-07-01 |
dc.identifier.citation | Oriol, R. [et al.]. Paired electrochemical removal of nitrate and terbuthylazine pesticide from groundwater using mesh electrodes. "Electrochimica acta", 1 Juliol 2021, vol. 383, p. 138354:1-138354:19. |
dc.identifier.issn | 0013-4686 |
dc.identifier.uri | http://hdl.handle.net/2117/356122 |
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 cm3 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 perchlorate. 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.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Enginyeria química |
dc.subject.lcsh | Electrochemistry |
dc.subject.other | Boron-doped diamond anode |
dc.subject.other | Electrochemical oxidation |
dc.subject.other | Electrodenitrification |
dc.subject.other | Groundwater |
dc.subject.other | Iron cathode |
dc.title | Paired electrochemical removal of nitrate and terbuthylazine pesticide from groundwater using mesh electrodes |
dc.type | Article |
dc.subject.lemac | Electroquímica |
dc.contributor.group | Universitat Politècnica de Catalunya. R2EM - Resource Recovery and Environmental Management |
dc.identifier.doi | 10.1016/j.electacta.2021.138354 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/abs/pii/S0013468621006447 |
dc.rights.access | Open Access |
local.identifier.drac | 31986281 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Oriol, R.; Brillas Coso, Enrique; Cabot, P.; Cortina, J.; Sirés, I. |
local.citation.publicationName | Electrochimica acta |
local.citation.volume | 383 |
local.citation.startingPage | 138354:1 |
local.citation.endingPage | 138354:19 |
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