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Enhanced Photocatalytic Degradation of the Imidazolinone Herbicide Imazapyr upon UV/Vis Irradiation in the Presence of CaᵪMnOᵧ-TiO₂ Hetero-Nanostructures: Degradation Pathways and Reaction Intermediates
dc.contributor.author | Bougarrani, Salma | |
dc.contributor.author | Sharma, Preetam K. | |
dc.contributor.author | Hamilton, Jeremy W. J. | |
dc.contributor.author | Singh, Anukriti | |
dc.contributor.author | Canle, Moisés | |
dc.contributor.author | El Azzouzi, Mohammed | |
dc.contributor.author | Byrne, John Anthony | |
dc.date.accessioned | 2020-05-28T10:28:45Z | |
dc.date.available | 2020-05-28T10:28:45Z | |
dc.date.issued | 2020-05-08 | |
dc.identifier.citation | Bougarrani, S.; Sharma, P.K.; Hamilton, J.W.J.; Singh, A.; Canle, M.; El Azzouzi, M.; Byrne, J.A. Enhanced Photocatalytic Degradation of the Imidazolinone Herbicide Imazapyr upon UV/Vis Irradiation in the Presence of CaᵪMnOᵧ-TiO₂ Hetero-Nanostructures: Degradation Pathways and Reaction Intermediates. Nanomaterials 2020, 10, 896. https://doi.org/10.3390/nano10050896 | es_ES |
dc.identifier.issn | 2079-4991 | |
dc.identifier.uri | http://hdl.handle.net/2183/25640 | |
dc.description.abstract | [Abstract] The determination of reaction pathways and identification of products of pollutants degradation is central to photocatalytic environmental remediation. This work focuses on the photocatalytic degradation of the herbicide Imazapyr (2-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl) pyridine-3-carboxylic acid) under UV-Vis and visible-only irradiation of aqueous suspensions of CaᵪMnOᵧ-TiO₂, and on the identification of the corresponding degradation pathways and reaction intermediates. CaᵪMnOᵧ-TiO₂ was formed by mixing CaᵪMnOᵧ and TiO₂ by mechanical grinding followed by annealing at 500 °C. A complete structural characterization of CaᵪMnOᵧ-TiO₂ was carried out. The photocatalytic activity of the hetero-nanostructures was determined using phenol and Imazapyr herbicide as model pollutants in a stirred tank reactor under UV-Vis and visible-only irradiation. Using equivalent loadings, CaᵪMnOᵧ-TiO₂ showed a higher rate (10.6 μM·h⁻¹) as compared to unmodified TiO₂ (7.4 μM·h⁻¹) for Imazapyr degradation under UV-Vis irradiation. The mineralization rate was 4.07 μM·h⁻¹ for CaᵪMnOᵧ-TiO₂ and 1.21 μM·h⁻¹ for TiO₂. In the CaᵪMnOᵧ-TiO₂ system, the concentration of intermediate products reached a maximum at 180 min of irradiation that then decreased to a half in 120 min. For unmodified TiO₂, the intermediates continuously increased with irradiation time with no decrease observed in their concentration. The enhanced efficiency of the CaᵪMnOᵧ-TiO₂ for the complete degradation of the Imazapyr and intermediates is attributed to an increased adsorption of polar species on the surface of CaᵪMnOᵧ. Based on LC-MS, photocatalytic degradation pathways for Imazapyr under UV-Vis irradiation have been proposed. Some photocatalytic degradation was obtained under visible-only irradiation for CaᵪMnOᵧ-TiO₂. Hydroxyl radicals were found to be main reactive oxygen species responsible for the photocatalytic degradation through radical scavenger investigations. | es_ES |
dc.description.sponsorship | This research received external funding from the British Council under the STREAM-MENA Institutional Links Scheme Grant number 278072873. This is a collaboration between Ulster University (UK), Technion Institute (Israel) and Rabat University (Morocco). MC acknowledges support from Ministerio de Economía y Competitividad (Spain) through project CTQ2015-71238-R (MINECO/FEDER). AS would like to acknowledge the financial support received from Ulster University (UK) through the VCRS scholarship. PS would like to acknowledge funding from Invest Northern Ireland for the BioDevices project | es_ES |
dc.description.sponsorship | British Council; 278072873 | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTQ2015-71238-R/ES/SOSTENIBILIDAD DE RECURSOS HIDRICOS: REDUCCION DE CONTAMINANTES ORGANICOS PERSISTENTES MEDIANTE UN SISTEMA COMBINADO DE HUMEDALES Y FOTOCATALISIS HETEROGENEA/ | |
dc.relation.uri | https://doi.org/10.3390/nano10050896 | es_ES |
dc.rights | Atribución 4.0 Internacional | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.subject | Persistent organic pollutants | es_ES |
dc.subject | Photocatalysis | es_ES |
dc.subject | TiO₂ | es_ES |
dc.subject | Birnessite | es_ES |
dc.subject | Water remediation | es_ES |
dc.subject | Hydroxyl radicals | es_ES |
dc.subject | Degradation pathways | es_ES |
dc.subject | Photoproducts | es_ES |
dc.title | Enhanced Photocatalytic Degradation of the Imidazolinone Herbicide Imazapyr upon UV/Vis Irradiation in the Presence of CaᵪMnOᵧ-TiO₂ Hetero-Nanostructures: Degradation Pathways and Reaction Intermediates | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.access | info:eu-repo/semantics/openAccess | es_ES |
UDC.journalTitle | Nanomaterials | es_ES |
UDC.volume | 10 | es_ES |
UDC.issue | 5 | es_ES |
UDC.startPage | 896 | es_ES |
dc.identifier.doi | 10.3390/nano10050896 |
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