Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s11356-020-11238-5 http://hdl.handle.net/11449/208092 |
Resumo: | The effect of incorporation of different amounts of cerium on iron oxides and different heat treatment temperatures was evaluated for the degradation of cephalexin (CEX) using heterogeneous Fenton and photo-Fenton processes. The materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), specific area (BET), and zeta potential (ZP). The conversion of magnetite to maghemite was observed when a 140 °C thermal treatment was applied. The insertion of cerium resulted in a loss of the uniform spherical shape of the particles. The material containing the lowest amount of cerium (0.5% w/w) presented an increase in the specific area from 91.2 to 171.6 m2 g−1 relative to the pure iron oxide, while with 2% (w/w) a decrease to 99.2 m2 g−1 was observed for the materials treated at 70 °C. The same behavior was observed for materials treated at 140 °C, however, with smaller areas. At pH 6.0, a low catalytic activity was observed contrasting to the high consumption of H2O2, suggesting its catalytic decomposition into water and oxygen. This was confirmed by the very low production of HO• in the degradation system. On the other hand, the high production of HO• was observed at pH 3.5, which was chosen as a working pH. The material treated at 140 °C and containing 1% Ce (w/w) was the highlight, promoting degradation of 0.052 mg of CEX per m2 area of the catalyst after 150 min using 1.0 mmol L−1 of H2O2. The CEX intermediates identified indicated hydroxylation as the major route of degradation. |
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Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexinAdvanced oxidation processesAntibioticCephalosporinsCEXMaghemiteMagnetiteThe effect of incorporation of different amounts of cerium on iron oxides and different heat treatment temperatures was evaluated for the degradation of cephalexin (CEX) using heterogeneous Fenton and photo-Fenton processes. The materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), specific area (BET), and zeta potential (ZP). The conversion of magnetite to maghemite was observed when a 140 °C thermal treatment was applied. The insertion of cerium resulted in a loss of the uniform spherical shape of the particles. The material containing the lowest amount of cerium (0.5% w/w) presented an increase in the specific area from 91.2 to 171.6 m2 g−1 relative to the pure iron oxide, while with 2% (w/w) a decrease to 99.2 m2 g−1 was observed for the materials treated at 70 °C. The same behavior was observed for materials treated at 140 °C, however, with smaller areas. At pH 6.0, a low catalytic activity was observed contrasting to the high consumption of H2O2, suggesting its catalytic decomposition into water and oxygen. This was confirmed by the very low production of HO• in the degradation system. On the other hand, the high production of HO• was observed at pH 3.5, which was chosen as a working pH. The material treated at 140 °C and containing 1% Ce (w/w) was the highlight, promoting degradation of 0.052 mg of CEX per m2 area of the catalyst after 150 min using 1.0 mmol L−1 of H2O2. The CEX intermediates identified indicated hydroxylation as the major route of degradation.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Institute of Chemistry São Paulo State University (UNESP)National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry UNESPInstitute of Chemistry São Paulo State University (UNESP)National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry UNESPFAPESP: 2014/50945-4FAPESP: 2018/12780-4CNPq: 465571/2014-0CAPES: 88887136426/2017/00Universidade Estadual Paulista (Unesp)Santos de Lima, Amanda [UNESP]Fernandes Pupo Nogueira, Raquel [UNESP]2021-06-25T11:06:11Z2021-06-25T11:06:11Z2021-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article23767-23777http://dx.doi.org/10.1007/s11356-020-11238-5Environmental Science and Pollution Research, v. 28, n. 19, p. 23767-23777, 2021.1614-74990944-1344http://hdl.handle.net/11449/20809210.1007/s11356-020-11238-52-s2.0-85094642786Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEnvironmental Science and Pollution Researchinfo:eu-repo/semantics/openAccess2021-10-23T18:52:04Zoai:repositorio.unesp.br:11449/208092Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:34:14.546293Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
title |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
spellingShingle |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin Santos de Lima, Amanda [UNESP] Advanced oxidation processes Antibiotic Cephalosporins CEX Maghemite Magnetite |
title_short |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
title_full |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
title_fullStr |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
title_full_unstemmed |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
title_sort |
Cerium-modified iron oxides applied as catalysts in the heterogeneous Fenton system for degradation of cephalexin |
author |
Santos de Lima, Amanda [UNESP] |
author_facet |
Santos de Lima, Amanda [UNESP] Fernandes Pupo Nogueira, Raquel [UNESP] |
author_role |
author |
author2 |
Fernandes Pupo Nogueira, Raquel [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Santos de Lima, Amanda [UNESP] Fernandes Pupo Nogueira, Raquel [UNESP] |
dc.subject.por.fl_str_mv |
Advanced oxidation processes Antibiotic Cephalosporins CEX Maghemite Magnetite |
topic |
Advanced oxidation processes Antibiotic Cephalosporins CEX Maghemite Magnetite |
description |
The effect of incorporation of different amounts of cerium on iron oxides and different heat treatment temperatures was evaluated for the degradation of cephalexin (CEX) using heterogeneous Fenton and photo-Fenton processes. The materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), specific area (BET), and zeta potential (ZP). The conversion of magnetite to maghemite was observed when a 140 °C thermal treatment was applied. The insertion of cerium resulted in a loss of the uniform spherical shape of the particles. The material containing the lowest amount of cerium (0.5% w/w) presented an increase in the specific area from 91.2 to 171.6 m2 g−1 relative to the pure iron oxide, while with 2% (w/w) a decrease to 99.2 m2 g−1 was observed for the materials treated at 70 °C. The same behavior was observed for materials treated at 140 °C, however, with smaller areas. At pH 6.0, a low catalytic activity was observed contrasting to the high consumption of H2O2, suggesting its catalytic decomposition into water and oxygen. This was confirmed by the very low production of HO• in the degradation system. On the other hand, the high production of HO• was observed at pH 3.5, which was chosen as a working pH. The material treated at 140 °C and containing 1% Ce (w/w) was the highlight, promoting degradation of 0.052 mg of CEX per m2 area of the catalyst after 150 min using 1.0 mmol L−1 of H2O2. The CEX intermediates identified indicated hydroxylation as the major route of degradation. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T11:06:11Z 2021-06-25T11:06:11Z 2021-05-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s11356-020-11238-5 Environmental Science and Pollution Research, v. 28, n. 19, p. 23767-23777, 2021. 1614-7499 0944-1344 http://hdl.handle.net/11449/208092 10.1007/s11356-020-11238-5 2-s2.0-85094642786 |
url |
http://dx.doi.org/10.1007/s11356-020-11238-5 http://hdl.handle.net/11449/208092 |
identifier_str_mv |
Environmental Science and Pollution Research, v. 28, n. 19, p. 23767-23777, 2021. 1614-7499 0944-1344 10.1007/s11356-020-11238-5 2-s2.0-85094642786 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Environmental Science and Pollution Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
23767-23777 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128828006989824 |