Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/20.500.12207/576 |
Resumo: | Diclofenac has been irradiated under UV-C light at 254 nm. The effect of some operating variables has been investigated. The kinetics of the process has been analysed by means of the corresponding quantum yield. The presence of free radical promoters has also been considered. Diclofenac initial concentration plays an important role in its conversion profile. First order kinetics is ruled out under the applied experimental conditions. The process efficiency is significantly enhanced if oxygen is bubbled instead of air. Diclofenac quantum yield values in the range ≈0.1–0.3 mol Einstein−1 were obtained depending on the operating conditions used (air or oxygen) and the kinetic methodology followed. The mineralization level achieved also increased from 30 to 80% when oxygen was sparged instead of air. The presence of free radicals promoters did not improve the diclofenac removal efficiency. |
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Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenacDiclofenacPhotolysisQuantum yieldPeroxidesDiclofenac has been irradiated under UV-C light at 254 nm. The effect of some operating variables has been investigated. The kinetics of the process has been analysed by means of the corresponding quantum yield. The presence of free radical promoters has also been considered. Diclofenac initial concentration plays an important role in its conversion profile. First order kinetics is ruled out under the applied experimental conditions. The process efficiency is significantly enhanced if oxygen is bubbled instead of air. Diclofenac quantum yield values in the range ≈0.1–0.3 mol Einstein−1 were obtained depending on the operating conditions used (air or oxygen) and the kinetic methodology followed. The mineralization level achieved also increased from 30 to 80% when oxygen was sparged instead of air. The presence of free radicals promoters did not improve the diclofenac removal efficiency.Elsevier2013-11-15T11:42:29Z2013-10-22T00:00:00Z2010-09-15T00:00:00Z2010-09-15T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/20.500.12207/576eng1385-8947metadata only accessinfo:eu-repo/semantics/openAccessRivas, JavierGimeno, OlgaCarvalhos, Maria Teresa BorralhoBeltrán, Fernandoreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-06-23T07:46:28Zoai:repositorio.ipbeja.pt:20.500.12207/576Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T14:58:16.293006Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
title |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
spellingShingle |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac Rivas, Javier Diclofenac Photolysis Quantum yield Peroxides |
title_short |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
title_full |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
title_fullStr |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
title_full_unstemmed |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
title_sort |
Influence of oxygen and free radicals promoters on the UV-254 nm photolysis of diclofenac |
author |
Rivas, Javier |
author_facet |
Rivas, Javier Gimeno, Olga Carvalhos, Maria Teresa Borralho Beltrán, Fernando |
author_role |
author |
author2 |
Gimeno, Olga Carvalhos, Maria Teresa Borralho Beltrán, Fernando |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Rivas, Javier Gimeno, Olga Carvalhos, Maria Teresa Borralho Beltrán, Fernando |
dc.subject.por.fl_str_mv |
Diclofenac Photolysis Quantum yield Peroxides |
topic |
Diclofenac Photolysis Quantum yield Peroxides |
description |
Diclofenac has been irradiated under UV-C light at 254 nm. The effect of some operating variables has been investigated. The kinetics of the process has been analysed by means of the corresponding quantum yield. The presence of free radical promoters has also been considered. Diclofenac initial concentration plays an important role in its conversion profile. First order kinetics is ruled out under the applied experimental conditions. The process efficiency is significantly enhanced if oxygen is bubbled instead of air. Diclofenac quantum yield values in the range ≈0.1–0.3 mol Einstein−1 were obtained depending on the operating conditions used (air or oxygen) and the kinetic methodology followed. The mineralization level achieved also increased from 30 to 80% when oxygen was sparged instead of air. The presence of free radicals promoters did not improve the diclofenac removal efficiency. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-09-15T00:00:00Z 2010-09-15T00:00:00Z 2013-11-15T11:42:29Z 2013-10-22T00:00:00Z |
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://hdl.handle.net/20.500.12207/576 |
url |
http://hdl.handle.net/20.500.12207/576 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1385-8947 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799129856045219840 |