Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode
Here, the antibiotic levofloxacin (LFX) widely used and detected in the environment was degraded by photoelectrolysis using a new electrode based on zinc oxide (ZnO) and a mixture of mixed oxides of ruthenium and titanium (MMO). The influence of the potential and irradiation of UV light was investig...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/30023 |
| Acceso en línea: | https://hdl.handle.net/10578/30023 |
| Access Level: | acceso abierto |
| Palabra clave: | Photoelectrocatalysis Photoanode MMO ZnO Oxidants species Levofloxacin pH |
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Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrodeGoulart, Lorena AthieMoratalla, ÁngelaLanza, Marcos Roberto de VasconcelosSáez Jiménez, CristinaRodrigo Rodrigo, Manuel AndrésPhotoelectrocatalysisPhotoanodeMMOZnOOxidants speciesLevofloxacinpHHere, the antibiotic levofloxacin (LFX) widely used and detected in the environment was degraded by photoelectrolysis using a new electrode based on zinc oxide (ZnO) and a mixture of mixed oxides of ruthenium and titanium (MMO). The influence of the potential and irradiation of UV light was investigated in the photostability of the Ti/MMO/ZnO electrode and in the degradation of the antibiotic. The experiments were conducted at different pH values (5.0, 7.0 and 9.0) in sodium sulfate solution in a glass reactor with central lighting. It was observed that the new Ti/MMO/ZnO electrode has good stability under light irradiation and potential, presenting excellent photocurrent and high photoactivity in LFX photoelectrolysis. The removal efficiency of the compound was directly related to the formation of oxidizing species in solution, the photo-generated charges on the electrode and the electrostatic characteristics of the molecule. The mineralization rate, the formation of reaction intermediates and short chain carboxylic acids (acetic, maleic, oxalic and oxamic acid), in addition to the formation of N-mineral species (NO3− and NH4+) was dependent on the pH of the solution and the investigated processes: photoelectrolysis was more efficient than photolysis, which, in turn, was more efficient than electrolysis. The synergistic effect and the high rate of degradation of LFX after 4.0 h of treatment (100%) observed in photoelectrolysis at alkaline pH, was associated with the high stability of the Ti/MMO/ZnO electrode at this pH, the photoactivation of sulfate ions and the ease generation of oxidizing radicals, such as radical dotOH.Aquí, el antibiótico levofloxacino (LFX), ampliamente utilizado y detectado en el medio ambiente, fue degradado por fotoelectrólisis utilizando un nuevo electrodo a base de óxido de zinc (ZnO) y una mezcla de óxidos mixtos de rutenio y titanio (MMO). Se investigó la influencia del potencial y la irradiación de la luz UV en la fotoestabilidad del electrodo Ti/MMO/ZnO y en la degradación del antibiótico. Los experimentos se realizaron a diferentes valores de pH (5,0, 7,0 y 9,0) en solución de sulfato de sodio en un reactor de vidrio con iluminación central. Se observó que el nuevo electrodo de Ti/MMO/ZnO tiene buena estabilidad bajo irradiación de luz y potencial, presentando excelente fotocorrientey alta fotoactividad en fotoelectrólisis LFX. La eficiencia de remoción del compuesto estuvo directamente relacionada con la formación de especies oxidantes en solución, las cargas fotogeneradas en el electrodo y las características electrostáticas de la molécula. La tasa de mineralización , la formación de intermedios de reacción y ácidos carboxílicos(ácido acético, maleico, oxálico y oxámico), además de la formación de especies N-minerales (NO3−y NH4+) fue dependiente del pH de la solución y los procesos investigados: la fotoelectrólisis fue más eficiente que la fotólisis, la cual, a su vez, fue más eficiente quela electrólisis. El efecto sinérgico y la alta tasa de degradación de LFX después de 4.0 h de tratamiento (100%) observado en fotoelectrólisis a pH alcalino, se asoció con la alta estabilidad del electrodo Ti/MMO/ZnO a este pH, la fotoactivación de iones sulfato y la facilidad de generación de radicales oxidantes, como elpunto radical OH.Elsevier202220222021info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/10578/30023reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésPID2019-107271RB-I00465571/2014-0302874/2017-8427452/2018-0#2014/50945-4#2016/08760-2#2019/04084-0#2017/10118-0info:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/300232026-05-27T07:36:41Z |
| dc.title.none.fl_str_mv |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| title |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| spellingShingle |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode Goulart, Lorena Athie Photoelectrocatalysis Photoanode MMO ZnO Oxidants species Levofloxacin pH |
| title_short |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| title_full |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| title_fullStr |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| title_full_unstemmed |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| title_sort |
Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ZnO electrode |
| dc.creator.none.fl_str_mv |
Goulart, Lorena Athie Moratalla, Ángela Lanza, Marcos Roberto de Vasconcelos Sáez Jiménez, Cristina Rodrigo Rodrigo, Manuel Andrés |
| author |
Goulart, Lorena Athie |
| author_facet |
Goulart, Lorena Athie Moratalla, Ángela Lanza, Marcos Roberto de Vasconcelos Sáez Jiménez, Cristina Rodrigo Rodrigo, Manuel Andrés |
| author_role |
author |
| author2 |
Moratalla, Ángela Lanza, Marcos Roberto de Vasconcelos Sáez Jiménez, Cristina Rodrigo Rodrigo, Manuel Andrés |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Photoelectrocatalysis Photoanode MMO ZnO Oxidants species Levofloxacin pH |
| topic |
Photoelectrocatalysis Photoanode MMO ZnO Oxidants species Levofloxacin pH |
| description |
Here, the antibiotic levofloxacin (LFX) widely used and detected in the environment was degraded by photoelectrolysis using a new electrode based on zinc oxide (ZnO) and a mixture of mixed oxides of ruthenium and titanium (MMO). The influence of the potential and irradiation of UV light was investigated in the photostability of the Ti/MMO/ZnO electrode and in the degradation of the antibiotic. The experiments were conducted at different pH values (5.0, 7.0 and 9.0) in sodium sulfate solution in a glass reactor with central lighting. It was observed that the new Ti/MMO/ZnO electrode has good stability under light irradiation and potential, presenting excellent photocurrent and high photoactivity in LFX photoelectrolysis. The removal efficiency of the compound was directly related to the formation of oxidizing species in solution, the photo-generated charges on the electrode and the electrostatic characteristics of the molecule. The mineralization rate, the formation of reaction intermediates and short chain carboxylic acids (acetic, maleic, oxalic and oxamic acid), in addition to the formation of N-mineral species (NO3− and NH4+) was dependent on the pH of the solution and the investigated processes: photoelectrolysis was more efficient than photolysis, which, in turn, was more efficient than electrolysis. The synergistic effect and the high rate of degradation of LFX after 4.0 h of treatment (100%) observed in photoelectrolysis at alkaline pH, was associated with the high stability of the Ti/MMO/ZnO electrode at this pH, the photoactivation of sulfate ions and the ease generation of oxidizing radicals, such as radical dotOH. |
| 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 |
https://hdl.handle.net/10578/30023 |
| url |
https://hdl.handle.net/10578/30023 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
PID2019-107271RB-I00 465571/2014-0 302874/2017-8 427452/2018-0 #2014/50945-4 #2016/08760-2 #2019/04084-0 #2017/10118-0 |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier |
| publisher.none.fl_str_mv |
Elsevier |
| dc.source.none.fl_str_mv |
reponame:RUIdeRA. Repositorio Institucional de la UCLM instname:Universidad de Castilla-La Mancha |
| instname_str |
Universidad de Castilla-La Mancha |
| reponame_str |
RUIdeRA. Repositorio Institucional de la UCLM |
| collection |
RUIdeRA. Repositorio Institucional de la UCLM |
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|
| repository.mail.fl_str_mv |
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1869413867098996737 |
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15,300719 |