Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water

Detalhes bibliográficos
Autor(a) principal: Praxedes, Fabiano Rafael [UNESP]
Data de Publicação: 2021
Outros Autores: Nobre, Marcos Augusto de Lima [UNESP], Poon, Po Shan, Matos, Juan, Lanfredi, Silvania [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/215187
Resumo: Potassium-sodium niobate-based hollows spheres were studied in the photocatalytic degradation of Basic Blue 41 dye in aqueous phase under UV irradiation. KxNa1-xNbO3 materials were prepared at 700oC by the spray pyrolysis method. Photocatalysts were characterized by XRD, SEM, TEM, N2 adsorption/desorption isotherms and FTIR. Different kinetic models of adsorption, direct photolysis, and photocatalytic degradation of the azo-dye were performed as a function of the pH of solution. The increase in potassium content is responsible of the distortion and polarization of the niobate structure promoting a decrease in the energy band-gap down to 3.01 eV for K0.5Na0.5NbO3. The photocatalytic activity observed on K0.5Na0.5NbO3 was up to 23 times higher than that on TiO2 in terms of the surface concentration of the azo-dye molecules adsorbed. A mechanism for the degradation of Basic Blue 41 azo-dye based on the reactive oxygen species detected by scavenger’s tests and mass-spectroscopy analysis was proposed.
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spelling Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted waterKxNa1-xNbO3 photocatalystsUltrasonic spray pyrolysisHollow spheresBasic blue 41Potassium-sodium niobate-based hollows spheres were studied in the photocatalytic degradation of Basic Blue 41 dye in aqueous phase under UV irradiation. KxNa1-xNbO3 materials were prepared at 700oC by the spray pyrolysis method. Photocatalysts were characterized by XRD, SEM, TEM, N2 adsorption/desorption isotherms and FTIR. Different kinetic models of adsorption, direct photolysis, and photocatalytic degradation of the azo-dye were performed as a function of the pH of solution. The increase in potassium content is responsible of the distortion and polarization of the niobate structure promoting a decrease in the energy band-gap down to 3.01 eV for K0.5Na0.5NbO3. The photocatalytic activity observed on K0.5Na0.5NbO3 was up to 23 times higher than that on TiO2 in terms of the surface concentration of the azo-dye molecules adsorbed. A mechanism for the degradation of Basic Blue 41 azo-dye based on the reactive oxygen species detected by scavenger’s tests and mass-spectroscopy analysis was proposed.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SPSão Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences, São José do Rio Preto, SPUnidad de Desarrollo Tecnológico (UDT), Universidad de Concepción, Barrio Universitario s/n, Concepción, ChileInstituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, 8900000 Santiago, ChileFAPESP: 2007/03510-9FAPESP: 2014/11189-0FAPESP: 2019/06623-6FAPESP: 2020/00781-6ElsevierUniversidade Estadual Paulista (Unesp)Praxedes, Fabiano Rafael [UNESP]Nobre, Marcos Augusto de Lima [UNESP]Poon, Po ShanMatos, JuanLanfredi, Silvania [UNESP]2021-11-23T13:59:38Z2021-11-23T13:59:38Z2021-07-06info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfApplied Catalysis B: Environmental, v. 298, p. 120502, 2021. DOI: https://doi.org/10.1016/j.apcatb.2021.120502.0926-3373http://hdl.handle.net/11449/2151879122020355484496720192860070453002397521899179510000-0001-7355-4387000-0003-4843-39750000-0002-6432-5408engApplied Catalysis B: Environmentalinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESP2024-06-19T12:44:41Zoai:repositorio.unesp.br:11449/215187Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:06:39.017969Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
title Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
spellingShingle Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
Praxedes, Fabiano Rafael [UNESP]
KxNa1-xNbO3 photocatalysts
Ultrasonic spray pyrolysis
Hollow spheres
Basic blue 41
title_short Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
title_full Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
title_fullStr Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
title_full_unstemmed Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
title_sort Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
author Praxedes, Fabiano Rafael [UNESP]
author_facet Praxedes, Fabiano Rafael [UNESP]
Nobre, Marcos Augusto de Lima [UNESP]
Poon, Po Shan
Matos, Juan
Lanfredi, Silvania [UNESP]
author_role author
author2 Nobre, Marcos Augusto de Lima [UNESP]
Poon, Po Shan
Matos, Juan
Lanfredi, Silvania [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Praxedes, Fabiano Rafael [UNESP]
Nobre, Marcos Augusto de Lima [UNESP]
Poon, Po Shan
Matos, Juan
Lanfredi, Silvania [UNESP]
dc.subject.por.fl_str_mv KxNa1-xNbO3 photocatalysts
Ultrasonic spray pyrolysis
Hollow spheres
Basic blue 41
topic KxNa1-xNbO3 photocatalysts
Ultrasonic spray pyrolysis
Hollow spheres
Basic blue 41
description Potassium-sodium niobate-based hollows spheres were studied in the photocatalytic degradation of Basic Blue 41 dye in aqueous phase under UV irradiation. KxNa1-xNbO3 materials were prepared at 700oC by the spray pyrolysis method. Photocatalysts were characterized by XRD, SEM, TEM, N2 adsorption/desorption isotherms and FTIR. Different kinetic models of adsorption, direct photolysis, and photocatalytic degradation of the azo-dye were performed as a function of the pH of solution. The increase in potassium content is responsible of the distortion and polarization of the niobate structure promoting a decrease in the energy band-gap down to 3.01 eV for K0.5Na0.5NbO3. The photocatalytic activity observed on K0.5Na0.5NbO3 was up to 23 times higher than that on TiO2 in terms of the surface concentration of the azo-dye molecules adsorbed. A mechanism for the degradation of Basic Blue 41 azo-dye based on the reactive oxygen species detected by scavenger’s tests and mass-spectroscopy analysis was proposed.
publishDate 2021
dc.date.none.fl_str_mv 2021-11-23T13:59:38Z
2021-11-23T13:59:38Z
2021-07-06
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 Applied Catalysis B: Environmental, v. 298, p. 120502, 2021. DOI: https://doi.org/10.1016/j.apcatb.2021.120502.
0926-3373
http://hdl.handle.net/11449/215187
9122020355484496
7201928600704530
0239752189917951
0000-0001-7355-4387
000-0003-4843-3975
0000-0002-6432-5408
identifier_str_mv Applied Catalysis B: Environmental, v. 298, p. 120502, 2021. DOI: https://doi.org/10.1016/j.apcatb.2021.120502.
0926-3373
9122020355484496
7201928600704530
0239752189917951
0000-0001-7355-4387
000-0003-4843-3975
0000-0002-6432-5408
url http://hdl.handle.net/11449/215187
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Applied Catalysis B: Environmental
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv 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_ 1808129285380112384

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