Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH

The requirement of acidification for the successful of the Fenton processes in water treatment has promoted the search for new strategies to work at pH close to neutrality. With this objective, in this work the use of nZVI has been evaluated for the oxidative elimination of 10 mg L−1 of atrazine at...

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Detalhes bibliográficos
Autores: Plaza, Jorge, Arencibia, Amaya, López-Muñoz, María José
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universidad Rey Juan Carlos
Repositorio:BURJC-Digital. Repositorio Institucional de la Universidad Rey Juan Carlos
OAI Identifier:oai:burjcdigital.urjc.es:10115/19102
Acesso em linha:http://hdl.handle.net/10115/19102
Access Level:acceso abierto
Palavra-chave:Zero-valent iron nanoparticles
Advanced oxidation processes
Fenton-like process
Water matrix
Atrazine degradation mechanism
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spelling Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pHPlaza, JorgeArencibia, AmayaLópez-Muñoz, María JoséZero-valent iron nanoparticlesAdvanced oxidation processesFenton-like processWater matrixAtrazine degradation mechanismThe requirement of acidification for the successful of the Fenton processes in water treatment has promoted the search for new strategies to work at pH close to neutrality. With this objective, in this work the use of nZVI has been evaluated for the oxidative elimination of 10 mg L−1 of atrazine at circumneutral pH with nZVI/UVA, nZVI/H2O2, and nZVI/H2O2/UVA systems. While UVA irradiation of sole nZVI was ineffective for degrading the herbicide, the addition of H2O2 boosted up the reaction, with the nZVI/H2O2/UVA system attaining the highest degradation rate. The inhibition of the reaction upon addition of tert-butanol as scavenger pointed out the significant role of hydroxyl radicals in the atrazine oxidation. The characterization of fresh and spent samples, carried out by XRD, SEM, TEM, and nitrogen adsorption-desorption experiments, confirmed the presence of ferric oxidized compounds responsible of the heterogeneous photo-Fenton-like reactions. On the basis of the degradation products determined by high performance liquid chromatography (HPLC), a scheme of atrazine degradation pathways in the ZVI/H2O2/UVA system was proposed in which the reaction is mainly initiated by alkylic oxidation rather than dechlorination. Finally, the effect on the atrazine oxidation rate of the water constituent species was analyzed in different water matrices (pure, supply, simulated and secondary effluent real water). Considered individually, Cl−, SO42−, HCO3−, and DOC, showed a moderate inhibitory effect on atrazine degradation kinetics, but their combination could explain the significant decrease of efficiency detected in the real secondary effluent water compared to less complex matrices.Elsevier202220222021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10115/19102reponame:BURJC-Digital. Repositorio Institucional de la Universidad Rey Juan Carlosinstname:Universidad Rey Juan CarlosInglésAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:burjcdigital.urjc.es:10115/191022026-06-24T12:48:17Z
dc.title.none.fl_str_mv Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
title Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
spellingShingle Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
Plaza, Jorge
Zero-valent iron nanoparticles
Advanced oxidation processes
Fenton-like process
Water matrix
Atrazine degradation mechanism
title_short Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
title_full Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
title_fullStr Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
title_full_unstemmed Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
title_sort Evaluation of nZVI for the degradation of atrazine in heterogeneous Fenton-like systems at circumneutral pH
dc.creator.none.fl_str_mv Plaza, Jorge
Arencibia, Amaya
López-Muñoz, María José
author Plaza, Jorge
author_facet Plaza, Jorge
Arencibia, Amaya
López-Muñoz, María José
author_role author
author2 Arencibia, Amaya
López-Muñoz, María José
author2_role author
author
dc.subject.none.fl_str_mv Zero-valent iron nanoparticles
Advanced oxidation processes
Fenton-like process
Water matrix
Atrazine degradation mechanism
topic Zero-valent iron nanoparticles
Advanced oxidation processes
Fenton-like process
Water matrix
Atrazine degradation mechanism
description The requirement of acidification for the successful of the Fenton processes in water treatment has promoted the search for new strategies to work at pH close to neutrality. With this objective, in this work the use of nZVI has been evaluated for the oxidative elimination of 10 mg L−1 of atrazine at circumneutral pH with nZVI/UVA, nZVI/H2O2, and nZVI/H2O2/UVA systems. While UVA irradiation of sole nZVI was ineffective for degrading the herbicide, the addition of H2O2 boosted up the reaction, with the nZVI/H2O2/UVA system attaining the highest degradation rate. The inhibition of the reaction upon addition of tert-butanol as scavenger pointed out the significant role of hydroxyl radicals in the atrazine oxidation. The characterization of fresh and spent samples, carried out by XRD, SEM, TEM, and nitrogen adsorption-desorption experiments, confirmed the presence of ferric oxidized compounds responsible of the heterogeneous photo-Fenton-like reactions. On the basis of the degradation products determined by high performance liquid chromatography (HPLC), a scheme of atrazine degradation pathways in the ZVI/H2O2/UVA system was proposed in which the reaction is mainly initiated by alkylic oxidation rather than dechlorination. Finally, the effect on the atrazine oxidation rate of the water constituent species was analyzed in different water matrices (pure, supply, simulated and secondary effluent real water). Considered individually, Cl−, SO42−, HCO3−, and DOC, showed a moderate inhibitory effect on atrazine degradation kinetics, but their combination could explain the significant decrease of efficiency detected in the real secondary effluent water compared to less complex matrices.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10115/19102
url http://hdl.handle.net/10115/19102
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:BURJC-Digital. Repositorio Institucional de la Universidad Rey Juan Carlos
instname:Universidad Rey Juan Carlos
instname_str Universidad Rey Juan Carlos
reponame_str BURJC-Digital. Repositorio Institucional de la Universidad Rey Juan Carlos
collection BURJC-Digital. Repositorio Institucional de la Universidad Rey Juan Carlos
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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