Sunlight photoactivity of rice husks-derived biogenic silica

Detalhes bibliográficos
Autor(a) principal: de Cordoba, María C. Fernández
Data de Publicação: 2019
Outros Autores: Matos, Juan, Montaña, Ricmary, Poon, Po S., Lanfredi, Silvania [UNESP], Praxedes, Fabiano R. [UNESP], Hernández-Garrido, Juan C., Calvino, José J., Rodríguez-Aguado, Elena, Rodríguez-Castellón, Enrique, Ania, Conchi O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.cattod.2018.12.008
http://hdl.handle.net/11449/187155
Resumo: Carbon-containing SiO 2 -based photocatalysts were prepared by the solvothermal treatment of rice husk as biogenic precursor in the presence and absence of TiO 2 and used for the photocatalytic degradation of rhodamine-B under simulated solar light. Data showed that the prepared catalysts are mainly composed of biogenic silica and displayed mesoporous character with surface areas ranging from 65 to 174 m 2 g -1 . The obtained materials showed photocatalytic activity comparable to that of commercial TiO 2 -P25 powders for the degradation of rhodamine-B under sunlight. The calcination at 350 °C improved the photocatalytic activity of the biogenic precursor by three times in the absence of TiO 2 . At converse, calcination of sample SiO 2 -TiO 2 decreased the photoactivity due to the appearance of non-photoactive TiSiO 4 crystalline phases in the catalyst, as inferred by XRD and XPS. A reaction mechanism for rhodamine-B degradation excluding the deethylation pathway has been proposed, based on the evolution of the absorbance spectra of rhodamine-B upon the photocatalytic tests.
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spelling Sunlight photoactivity of rice husks-derived biogenic silicaArtificial solar lightBiogenic silicaPhotocatalysisRhodamine BRice husksCarbon-containing SiO 2 -based photocatalysts were prepared by the solvothermal treatment of rice husk as biogenic precursor in the presence and absence of TiO 2 and used for the photocatalytic degradation of rhodamine-B under simulated solar light. Data showed that the prepared catalysts are mainly composed of biogenic silica and displayed mesoporous character with surface areas ranging from 65 to 174 m 2 g -1 . The obtained materials showed photocatalytic activity comparable to that of commercial TiO 2 -P25 powders for the degradation of rhodamine-B under sunlight. The calcination at 350 °C improved the photocatalytic activity of the biogenic precursor by three times in the absence of TiO 2 . At converse, calcination of sample SiO 2 -TiO 2 decreased the photoactivity due to the appearance of non-photoactive TiSiO 4 crystalline phases in the catalyst, as inferred by XRD and XPS. A reaction mechanism for rhodamine-B degradation excluding the deethylation pathway has been proposed, based on the evolution of the absorbance spectra of rhodamine-B upon the photocatalytic tests.Federación Española de Enfermedades RarasFondo Nacional de Desarrollo Científico y TecnológicoBioenergy Department Technological Development Unit University of ConcepcionCEMHTI CNRS (UPR 3079) Univ. OrleansMillenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC)São Paulo State University (Unesp) Laboratory LaCCeFDepartment of Materials Science and Metallurgy Engineering and Inorganic Chemistry Faculty of Sciences University of CadizInorganic Chemistry Department Faculty of Science University of MalagaSão Paulo State University (Unesp) Laboratory LaCCeFUniversity of ConcepcionUniv. OrleansMillenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC)Universidade Estadual Paulista (Unesp)University of CadizUniversity of Malagade Cordoba, María C. FernándezMatos, JuanMontaña, RicmaryPoon, Po S.Lanfredi, Silvania [UNESP]Praxedes, Fabiano R. [UNESP]Hernández-Garrido, Juan C.Calvino, José J.Rodríguez-Aguado, ElenaRodríguez-Castellón, EnriqueAnia, Conchi O.2019-10-06T15:27:11Z2019-10-06T15:27:11Z2019-05-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article125-135http://dx.doi.org/10.1016/j.cattod.2018.12.008Catalysis Today, v. 328, p. 125-135.0920-5861http://hdl.handle.net/11449/18715510.1016/j.cattod.2018.12.0082-s2.0-85058181163Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCatalysis Todayinfo:eu-repo/semantics/openAccess2021-10-22T18:56:47Zoai:repositorio.unesp.br:11449/187155Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T18:56:47Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Sunlight photoactivity of rice husks-derived biogenic silica
title Sunlight photoactivity of rice husks-derived biogenic silica
spellingShingle Sunlight photoactivity of rice husks-derived biogenic silica
de Cordoba, María C. Fernández
Artificial solar light
Biogenic silica
Photocatalysis
Rhodamine B
Rice husks
title_short Sunlight photoactivity of rice husks-derived biogenic silica
title_full Sunlight photoactivity of rice husks-derived biogenic silica
title_fullStr Sunlight photoactivity of rice husks-derived biogenic silica
title_full_unstemmed Sunlight photoactivity of rice husks-derived biogenic silica
title_sort Sunlight photoactivity of rice husks-derived biogenic silica
author de Cordoba, María C. Fernández
author_facet de Cordoba, María C. Fernández
Matos, Juan
Montaña, Ricmary
Poon, Po S.
Lanfredi, Silvania [UNESP]
Praxedes, Fabiano R. [UNESP]
Hernández-Garrido, Juan C.
Calvino, José J.
Rodríguez-Aguado, Elena
Rodríguez-Castellón, Enrique
Ania, Conchi O.
author_role author
author2 Matos, Juan
Montaña, Ricmary
Poon, Po S.
Lanfredi, Silvania [UNESP]
Praxedes, Fabiano R. [UNESP]
Hernández-Garrido, Juan C.
Calvino, José J.
Rodríguez-Aguado, Elena
Rodríguez-Castellón, Enrique
Ania, Conchi O.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv University of Concepcion
Univ. Orleans
Millenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC)
Universidade Estadual Paulista (Unesp)
University of Cadiz
University of Malaga
dc.contributor.author.fl_str_mv de Cordoba, María C. Fernández
Matos, Juan
Montaña, Ricmary
Poon, Po S.
Lanfredi, Silvania [UNESP]
Praxedes, Fabiano R. [UNESP]
Hernández-Garrido, Juan C.
Calvino, José J.
Rodríguez-Aguado, Elena
Rodríguez-Castellón, Enrique
Ania, Conchi O.
dc.subject.por.fl_str_mv Artificial solar light
Biogenic silica
Photocatalysis
Rhodamine B
Rice husks
topic Artificial solar light
Biogenic silica
Photocatalysis
Rhodamine B
Rice husks
description Carbon-containing SiO 2 -based photocatalysts were prepared by the solvothermal treatment of rice husk as biogenic precursor in the presence and absence of TiO 2 and used for the photocatalytic degradation of rhodamine-B under simulated solar light. Data showed that the prepared catalysts are mainly composed of biogenic silica and displayed mesoporous character with surface areas ranging from 65 to 174 m 2 g -1 . The obtained materials showed photocatalytic activity comparable to that of commercial TiO 2 -P25 powders for the degradation of rhodamine-B under sunlight. The calcination at 350 °C improved the photocatalytic activity of the biogenic precursor by three times in the absence of TiO 2 . At converse, calcination of sample SiO 2 -TiO 2 decreased the photoactivity due to the appearance of non-photoactive TiSiO 4 crystalline phases in the catalyst, as inferred by XRD and XPS. A reaction mechanism for rhodamine-B degradation excluding the deethylation pathway has been proposed, based on the evolution of the absorbance spectra of rhodamine-B upon the photocatalytic tests.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-06T15:27:11Z
2019-10-06T15:27:11Z
2019-05-15
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/10.1016/j.cattod.2018.12.008
Catalysis Today, v. 328, p. 125-135.
0920-5861
http://hdl.handle.net/11449/187155
10.1016/j.cattod.2018.12.008
2-s2.0-85058181163
url http://dx.doi.org/10.1016/j.cattod.2018.12.008
http://hdl.handle.net/11449/187155
identifier_str_mv Catalysis Today, v. 328, p. 125-135.
0920-5861
10.1016/j.cattod.2018.12.008
2-s2.0-85058181163
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Catalysis Today
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 125-135
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
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