Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor

Autores
Luca, Vittorio; Osborne, Michael; Sizgek, Devlet; Griffith, Christopher; Araujo, Paula Zulema
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Synthetic sitinakite contains in its structure a discrete wire-like sublattice of linked TiO6 octahedra. This sublattice is held apart by silicate tetrahedra forming one-dimensional channels that run down the c axis. The optical properties of this structural arrangement have been studied and compared with other titanosilicate phases, the best known being ETS-10. Thus, sitinakite which has twice the titanate wire diameter of ETS-10 has a band gap of 4.07 eV compared with 3.87 eV. The reduced electron-hole effective mass of the sitinakite quantum-confined system has been calculated through use of the effective mass model and compared with that of other titanosilicate materials. The sitinakite phase has been shown to effectively photodegrade methylene blue (MB) dye at pH 7 using visible light excitation and displays a higher degradation rate than TiO2 (Degussa, P25) under the same experimental conditions. On the contrary, under UV excitation, the photodegradation rate obtained using P25 is much higher than that using sitinakite. Given that the band edge of sitinkaite is significantly blue shifted compared with that of P25, photodegradation of MB using sitinakite is attributed to sensitization of the MB cationic dye which is strongly adsorbed onto the negatively charged sitinakite surfaces.
Fil: Luca, Vittorio. Australian Nuclear Science and Technology Organisation; Australia
Fil: Osborne, Michael. Australian Nuclear Science and Technology Organisation; Australia
Fil: Sizgek, Devlet. Australian Nuclear Science and Technology Organisation; Australia
Fil: Griffith, Christopher. Australian Nuclear Science and Technology Organisation; Australia
Fil: Araujo, Paula Zulema. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
X-Ray Absorption
Titanium Oxide
Photocatalysis
Ion-Exchange
Titosilicate
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/54100
Acceder
id CONICETDig_326a4c6a61090cde38389045262a7bc7
oai_identifier_str oai:ri.conicet.gov.ar:11336/54100
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductorLuca, VittorioOsborne, MichaelSizgek, DevletGriffith, ChristopherAraujo, Paula ZulemaX-Ray AbsorptionTitanium OxidePhotocatalysisIon-ExchangeTitosilicatehttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Synthetic sitinakite contains in its structure a discrete wire-like sublattice of linked TiO6 octahedra. This sublattice is held apart by silicate tetrahedra forming one-dimensional channels that run down the c axis. The optical properties of this structural arrangement have been studied and compared with other titanosilicate phases, the best known being ETS-10. Thus, sitinakite which has twice the titanate wire diameter of ETS-10 has a band gap of 4.07 eV compared with 3.87 eV. The reduced electron-hole effective mass of the sitinakite quantum-confined system has been calculated through use of the effective mass model and compared with that of other titanosilicate materials. The sitinakite phase has been shown to effectively photodegrade methylene blue (MB) dye at pH 7 using visible light excitation and displays a higher degradation rate than TiO2 (Degussa, P25) under the same experimental conditions. On the contrary, under UV excitation, the photodegradation rate obtained using P25 is much higher than that using sitinakite. Given that the band edge of sitinkaite is significantly blue shifted compared with that of P25, photodegradation of MB using sitinakite is attributed to sensitization of the MB cationic dye which is strongly adsorbed onto the negatively charged sitinakite surfaces.Fil: Luca, Vittorio. Australian Nuclear Science and Technology Organisation; AustraliaFil: Osborne, Michael. Australian Nuclear Science and Technology Organisation; AustraliaFil: Sizgek, Devlet. Australian Nuclear Science and Technology Organisation; AustraliaFil: Griffith, Christopher. Australian Nuclear Science and Technology Organisation; AustraliaFil: Araujo, Paula Zulema. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaAmerican Chemical Society2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54100Luca, Vittorio; Osborne, Michael; Sizgek, Devlet; Griffith, Christopher; Araujo, Paula Zulema; Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor; American Chemical Society; Chemistry Of Materials; 18; 26; 12-2006; 6132-61380897-4756CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/abs/10.1021/cm052839pinfo:eu-repo/semantics/altIdentifier/doi/10.1021/cm052839pinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:36:12Zoai:ri.conicet.gov.ar:11336/54100instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:36:12.475CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
title Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
spellingShingle Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
Luca, Vittorio
X-Ray Absorption
Titanium Oxide
Photocatalysis
Ion-Exchange
Titosilicate
title_short Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
title_full Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
title_fullStr Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
title_full_unstemmed Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
title_sort Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor
dc.creator.none.fl_str_mv Luca, Vittorio
Osborne, Michael
Sizgek, Devlet
Griffith, Christopher
Araujo, Paula Zulema
author Luca, Vittorio
author_facet Luca, Vittorio
Osborne, Michael
Sizgek, Devlet
Griffith, Christopher
Araujo, Paula Zulema
author_role author
author2 Osborne, Michael
Sizgek, Devlet
Griffith, Christopher
Araujo, Paula Zulema
author2_role author
author
author
author
dc.subject.none.fl_str_mv X-Ray Absorption
Titanium Oxide
Photocatalysis
Ion-Exchange
Titosilicate
topic X-Ray Absorption
Titanium Oxide
Photocatalysis
Ion-Exchange
Titosilicate
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Synthetic sitinakite contains in its structure a discrete wire-like sublattice of linked TiO6 octahedra. This sublattice is held apart by silicate tetrahedra forming one-dimensional channels that run down the c axis. The optical properties of this structural arrangement have been studied and compared with other titanosilicate phases, the best known being ETS-10. Thus, sitinakite which has twice the titanate wire diameter of ETS-10 has a band gap of 4.07 eV compared with 3.87 eV. The reduced electron-hole effective mass of the sitinakite quantum-confined system has been calculated through use of the effective mass model and compared with that of other titanosilicate materials. The sitinakite phase has been shown to effectively photodegrade methylene blue (MB) dye at pH 7 using visible light excitation and displays a higher degradation rate than TiO2 (Degussa, P25) under the same experimental conditions. On the contrary, under UV excitation, the photodegradation rate obtained using P25 is much higher than that using sitinakite. Given that the band edge of sitinkaite is significantly blue shifted compared with that of P25, photodegradation of MB using sitinakite is attributed to sensitization of the MB cationic dye which is strongly adsorbed onto the negatively charged sitinakite surfaces.
Fil: Luca, Vittorio. Australian Nuclear Science and Technology Organisation; Australia
Fil: Osborne, Michael. Australian Nuclear Science and Technology Organisation; Australia
Fil: Sizgek, Devlet. Australian Nuclear Science and Technology Organisation; Australia
Fil: Griffith, Christopher. Australian Nuclear Science and Technology Organisation; Australia
Fil: Araujo, Paula Zulema. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Synthetic sitinakite contains in its structure a discrete wire-like sublattice of linked TiO6 octahedra. This sublattice is held apart by silicate tetrahedra forming one-dimensional channels that run down the c axis. The optical properties of this structural arrangement have been studied and compared with other titanosilicate phases, the best known being ETS-10. Thus, sitinakite which has twice the titanate wire diameter of ETS-10 has a band gap of 4.07 eV compared with 3.87 eV. The reduced electron-hole effective mass of the sitinakite quantum-confined system has been calculated through use of the effective mass model and compared with that of other titanosilicate materials. The sitinakite phase has been shown to effectively photodegrade methylene blue (MB) dye at pH 7 using visible light excitation and displays a higher degradation rate than TiO2 (Degussa, P25) under the same experimental conditions. On the contrary, under UV excitation, the photodegradation rate obtained using P25 is much higher than that using sitinakite. Given that the band edge of sitinkaite is significantly blue shifted compared with that of P25, photodegradation of MB using sitinakite is attributed to sensitization of the MB cationic dye which is strongly adsorbed onto the negatively charged sitinakite surfaces.
publishDate 2006
dc.date.none.fl_str_mv 2006-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/54100
Luca, Vittorio; Osborne, Michael; Sizgek, Devlet; Griffith, Christopher; Araujo, Paula Zulema; Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor; American Chemical Society; Chemistry Of Materials; 18; 26; 12-2006; 6132-6138
0897-4756
CONICET Digital
CONICET
url http://hdl.handle.net/11336/54100
identifier_str_mv Luca, Vittorio; Osborne, Michael; Sizgek, Devlet; Griffith, Christopher; Araujo, Paula Zulema; Photodegradation of methylene blue using crystalline titanosilicate quantum-confined semiconductor; American Chemical Society; Chemistry Of Materials; 18; 26; 12-2006; 6132-6138
0897-4756
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/abs/10.1021/cm052839p
info:eu-repo/semantics/altIdentifier/doi/10.1021/cm052839p
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846082826568466432
score 13.22299

Publicaciones similares