Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism
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/10.1016/j.apsusc.2020.148137 http://hdl.handle.net/11449/208056 |
Resumo: | Na2Ti3O7/H2Ti3O7 heterojunction nanotubes were obtained through the microwave-assisted hydrothermal method (MAH) with different band gap energy engineering. This study aimed to synthesize sodium titanate nanotubes and evaluate the influence of H+ insertion on their photocatalytic properties. Heterojunctions were identified by X-ray diffraction, Raman spectroscopy and high-resolution transmission electron microscopy, and their electronic levels and defects were investigated using diffuse reflectance and photoluminescence spectroscopies in the UV–Vis region. The cation exchange process promotes the formation of Na2Ti3O7/H2Ti3O7 heterojunction with coexistence of both phases in the nanotube. Photocatalytic results of Rhodamine-B (Rh-B) dye discoloration show that the prepared materials have activity under visible and UV light irradiation, and are dependent on the proportion of hydrogen and sodium-titanate phases present. The material with highest sodium concentration showed discoloration with a half-life time of 23 min under visible light irradiation. Theoretical results reveal the heterojunction band offset as a staggered gap, with the effective bandgap occurring between the O-2p of Na2Ti3O7 and Ti-3d of H2Ti3O7. The charge carrier transfer mechanism in the heterojunctions is well described by Z-scheme, with H2Ti3O7 and Na2Ti3O7 as the main oxidation and reduction phases for dye discoloration. |
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Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanismCharge carrier transfer mechanismHeterojunctionNanotubesZ-schemeNa2Ti3O7/H2Ti3O7 heterojunction nanotubes were obtained through the microwave-assisted hydrothermal method (MAH) with different band gap energy engineering. This study aimed to synthesize sodium titanate nanotubes and evaluate the influence of H+ insertion on their photocatalytic properties. Heterojunctions were identified by X-ray diffraction, Raman spectroscopy and high-resolution transmission electron microscopy, and their electronic levels and defects were investigated using diffuse reflectance and photoluminescence spectroscopies in the UV–Vis region. The cation exchange process promotes the formation of Na2Ti3O7/H2Ti3O7 heterojunction with coexistence of both phases in the nanotube. Photocatalytic results of Rhodamine-B (Rh-B) dye discoloration show that the prepared materials have activity under visible and UV light irradiation, and are dependent on the proportion of hydrogen and sodium-titanate phases present. The material with highest sodium concentration showed discoloration with a half-life time of 23 min under visible light irradiation. Theoretical results reveal the heterojunction band offset as a staggered gap, with the effective bandgap occurring between the O-2p of Na2Ti3O7 and Ti-3d of H2Ti3O7. The charge carrier transfer mechanism in the heterojunctions is well described by Z-scheme, with H2Ti3O7 and Na2Ti3O7 as the main oxidation and reduction phases for dye discoloration.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)LIEC – Chemistry Institute São Paulo State University – UNESPLIEC – Departament of Chemistry São Carlos Federal University – UFSCarModeling and Molecular Simulations Group Sao Paulo State University UNESPDepartament of Chemistry Federal Institute of São Paulo – IFSPFaculty of Engineering of Guaratinguetá – UNESPDepartment of Physics São Carlos Federal University – UFSCarLIEC – Chemistry Institute São Paulo State University – UNESPModeling and Molecular Simulations Group Sao Paulo State University UNESPFaculty of Engineering of Guaratinguetá – UNESPCNPq: 142035/2017-3Universidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)Federal Institute of São Paulo – IFSPIani, Isabela M. [UNESP]Teodoro, ViníciusMarana, Naiara L. [UNESP]Coleto, UbirajaraSambrano, Julio R. [UNESP]Simões, Alexandre Z. [UNESP]Teodoro, Marcio D.Longo, ElsonPerazolli, Leinig A. [UNESP]A. C. Amoresi, Rafael [UNESP]Aparecida Zaghete, Maria [UNESP]2021-06-25T11:05:38Z2021-06-25T11:05:38Z2021-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.apsusc.2020.148137Applied Surface Science, v. 538.0169-4332http://hdl.handle.net/11449/20805610.1016/j.apsusc.2020.1481372-s2.0-85092910515Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Surface Scienceinfo:eu-repo/semantics/openAccess2021-10-23T18:52:01Zoai:repositorio.unesp.br:11449/208056Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T18:52:01Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
title |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
spellingShingle |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism Iani, Isabela M. [UNESP] Charge carrier transfer mechanism Heterojunction Nanotubes Z-scheme |
title_short |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
title_full |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
title_fullStr |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
title_full_unstemmed |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
title_sort |
Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism |
author |
Iani, Isabela M. [UNESP] |
author_facet |
Iani, Isabela M. [UNESP] Teodoro, Vinícius Marana, Naiara L. [UNESP] Coleto, Ubirajara Sambrano, Julio R. [UNESP] Simões, Alexandre Z. [UNESP] Teodoro, Marcio D. Longo, Elson Perazolli, Leinig A. [UNESP] A. C. Amoresi, Rafael [UNESP] Aparecida Zaghete, Maria [UNESP] |
author_role |
author |
author2 |
Teodoro, Vinícius Marana, Naiara L. [UNESP] Coleto, Ubirajara Sambrano, Julio R. [UNESP] Simões, Alexandre Z. [UNESP] Teodoro, Marcio D. Longo, Elson Perazolli, Leinig A. [UNESP] A. C. Amoresi, Rafael [UNESP] Aparecida Zaghete, Maria [UNESP] |
author2_role |
author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de São Carlos (UFSCar) Federal Institute of São Paulo – IFSP |
dc.contributor.author.fl_str_mv |
Iani, Isabela M. [UNESP] Teodoro, Vinícius Marana, Naiara L. [UNESP] Coleto, Ubirajara Sambrano, Julio R. [UNESP] Simões, Alexandre Z. [UNESP] Teodoro, Marcio D. Longo, Elson Perazolli, Leinig A. [UNESP] A. C. Amoresi, Rafael [UNESP] Aparecida Zaghete, Maria [UNESP] |
dc.subject.por.fl_str_mv |
Charge carrier transfer mechanism Heterojunction Nanotubes Z-scheme |
topic |
Charge carrier transfer mechanism Heterojunction Nanotubes Z-scheme |
description |
Na2Ti3O7/H2Ti3O7 heterojunction nanotubes were obtained through the microwave-assisted hydrothermal method (MAH) with different band gap energy engineering. This study aimed to synthesize sodium titanate nanotubes and evaluate the influence of H+ insertion on their photocatalytic properties. Heterojunctions were identified by X-ray diffraction, Raman spectroscopy and high-resolution transmission electron microscopy, and their electronic levels and defects were investigated using diffuse reflectance and photoluminescence spectroscopies in the UV–Vis region. The cation exchange process promotes the formation of Na2Ti3O7/H2Ti3O7 heterojunction with coexistence of both phases in the nanotube. Photocatalytic results of Rhodamine-B (Rh-B) dye discoloration show that the prepared materials have activity under visible and UV light irradiation, and are dependent on the proportion of hydrogen and sodium-titanate phases present. The material with highest sodium concentration showed discoloration with a half-life time of 23 min under visible light irradiation. Theoretical results reveal the heterojunction band offset as a staggered gap, with the effective bandgap occurring between the O-2p of Na2Ti3O7 and Ti-3d of H2Ti3O7. The charge carrier transfer mechanism in the heterojunctions is well described by Z-scheme, with H2Ti3O7 and Na2Ti3O7 as the main oxidation and reduction phases for dye discoloration. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T11:05:38Z 2021-06-25T11:05:38Z 2021-02-01 |
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/10.1016/j.apsusc.2020.148137 Applied Surface Science, v. 538. 0169-4332 http://hdl.handle.net/11449/208056 10.1016/j.apsusc.2020.148137 2-s2.0-85092910515 |
url |
http://dx.doi.org/10.1016/j.apsusc.2020.148137 http://hdl.handle.net/11449/208056 |
identifier_str_mv |
Applied Surface Science, v. 538. 0169-4332 10.1016/j.apsusc.2020.148137 2-s2.0-85092910515 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Surface Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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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1799964679733248000 |