Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH

Autores
Rengifo Herrera, Julian Andres; Pizzio, Luis Rene; Blanco, Mirta Noemi; Roussel, Christophe; Pulgarin, Cesar
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Under air atmosphere, the photocatalytic discoloration of malachite green (MG) aqueous solutions (atriphenylmethane dye) in the presence of TiO2 and UV light followed an oxidative pathway, involving an N-demethylation process evidenced by a blue shifting of the main absorption band with a maximum at 618 nm. This oxidative process was affected by the nature of the dye counter-ion and the pH of the solution. At pH 6.0, the oxidation was found to be faster than at pH 3.0, perhaps due to the poor interactions between MG and the semiconductor surface. Furthermore, with the presence of oxalate as counter-ion, the oxidative photocatalytic discoloration was negatively affected mainly at acidic pH. Under nitrogen atmosphere, some evidence was found about the double behaviour of MG when involved in the photocatalytic discoloration reactions pertaining to TiO2 under these conditions. MG could be simultaneously oxidized, forming N-demethlyated by-products, or reduced, thus leading to leuco-malachite green (LMG) (a colorless and toxic substance) as the main product. The LMG formation is favoured at low pH in the presence of oxalate as counter-ion.
Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Roussel, Christophe. Ecole Polytechnique Federal de Lausanne. Station 6. SB-SCGC; Suiza
Fil: Pulgarin, Cesar. Ecole Polytechnique Federale de Lausanne. Station 6. SB-ISIC-GGEC; Suiza
Materia
Heterogeneous Tio2 Photocatalysis
Degussa P-25
Malachite Green
Leuco Malachite Green
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:11336/4929
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/4929
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pHRengifo Herrera, Julian AndresPizzio, Luis ReneBlanco, Mirta NoemiRoussel, ChristophePulgarin, CesarHeterogeneous Tio2 PhotocatalysisDegussa P-25Malachite GreenLeuco Malachite Greenhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Under air atmosphere, the photocatalytic discoloration of malachite green (MG) aqueous solutions (atriphenylmethane dye) in the presence of TiO2 and UV light followed an oxidative pathway, involving an N-demethylation process evidenced by a blue shifting of the main absorption band with a maximum at 618 nm. This oxidative process was affected by the nature of the dye counter-ion and the pH of the solution. At pH 6.0, the oxidation was found to be faster than at pH 3.0, perhaps due to the poor interactions between MG and the semiconductor surface. Furthermore, with the presence of oxalate as counter-ion, the oxidative photocatalytic discoloration was negatively affected mainly at acidic pH. Under nitrogen atmosphere, some evidence was found about the double behaviour of MG when involved in the photocatalytic discoloration reactions pertaining to TiO2 under these conditions. MG could be simultaneously oxidized, forming N-demethlyated by-products, or reduced, thus leading to leuco-malachite green (LMG) (a colorless and toxic substance) as the main product. The LMG formation is favoured at low pH in the presence of oxalate as counter-ion.Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Roussel, Christophe. Ecole Polytechnique Federal de Lausanne. Station 6. SB-SCGC; SuizaFil: Pulgarin, Cesar. Ecole Polytechnique Federale de Lausanne. Station 6. SB-ISIC-GGEC; SuizaRoyal Society of Chemistry2011-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4929Rengifo Herrera, Julian Andres; Pizzio, Luis Rene; Blanco, Mirta Noemi; Roussel, Christophe ; Pulgarin, Cesar; Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH; Royal Society of Chemistry; Photochemical and Photobiological Sciences; 10; 1; 1-2011; 29-341474-905Xenginfo:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2011/PP/c0pp00196ainfo:eu-repo/semantics/altIdentifier/doi/10.1039/c0pp00196ainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:18:18Zoai:ri.conicet.gov.ar:11336/4929instacron: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:34982025-10-22 11:18:18.783CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
title Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
spellingShingle Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
Rengifo Herrera, Julian Andres
Heterogeneous Tio2 Photocatalysis
Degussa P-25
Malachite Green
Leuco Malachite Green
title_short Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
title_full Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
title_fullStr Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
title_full_unstemmed Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
title_sort Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH
dc.creator.none.fl_str_mv Rengifo Herrera, Julian Andres
Pizzio, Luis Rene
Blanco, Mirta Noemi
Roussel, Christophe
Pulgarin, Cesar
author Rengifo Herrera, Julian Andres
author_facet Rengifo Herrera, Julian Andres
Pizzio, Luis Rene
Blanco, Mirta Noemi
Roussel, Christophe
Pulgarin, Cesar
author_role author
author2 Pizzio, Luis Rene
Blanco, Mirta Noemi
Roussel, Christophe
Pulgarin, Cesar
author2_role author
author
author
author
dc.subject.none.fl_str_mv Heterogeneous Tio2 Photocatalysis
Degussa P-25
Malachite Green
Leuco Malachite Green
topic Heterogeneous Tio2 Photocatalysis
Degussa P-25
Malachite Green
Leuco Malachite Green
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Under air atmosphere, the photocatalytic discoloration of malachite green (MG) aqueous solutions (atriphenylmethane dye) in the presence of TiO2 and UV light followed an oxidative pathway, involving an N-demethylation process evidenced by a blue shifting of the main absorption band with a maximum at 618 nm. This oxidative process was affected by the nature of the dye counter-ion and the pH of the solution. At pH 6.0, the oxidation was found to be faster than at pH 3.0, perhaps due to the poor interactions between MG and the semiconductor surface. Furthermore, with the presence of oxalate as counter-ion, the oxidative photocatalytic discoloration was negatively affected mainly at acidic pH. Under nitrogen atmosphere, some evidence was found about the double behaviour of MG when involved in the photocatalytic discoloration reactions pertaining to TiO2 under these conditions. MG could be simultaneously oxidized, forming N-demethlyated by-products, or reduced, thus leading to leuco-malachite green (LMG) (a colorless and toxic substance) as the main product. The LMG formation is favoured at low pH in the presence of oxalate as counter-ion.
Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Roussel, Christophe. Ecole Polytechnique Federal de Lausanne. Station 6. SB-SCGC; Suiza
Fil: Pulgarin, Cesar. Ecole Polytechnique Federale de Lausanne. Station 6. SB-ISIC-GGEC; Suiza
description Under air atmosphere, the photocatalytic discoloration of malachite green (MG) aqueous solutions (atriphenylmethane dye) in the presence of TiO2 and UV light followed an oxidative pathway, involving an N-demethylation process evidenced by a blue shifting of the main absorption band with a maximum at 618 nm. This oxidative process was affected by the nature of the dye counter-ion and the pH of the solution. At pH 6.0, the oxidation was found to be faster than at pH 3.0, perhaps due to the poor interactions between MG and the semiconductor surface. Furthermore, with the presence of oxalate as counter-ion, the oxidative photocatalytic discoloration was negatively affected mainly at acidic pH. Under nitrogen atmosphere, some evidence was found about the double behaviour of MG when involved in the photocatalytic discoloration reactions pertaining to TiO2 under these conditions. MG could be simultaneously oxidized, forming N-demethlyated by-products, or reduced, thus leading to leuco-malachite green (LMG) (a colorless and toxic substance) as the main product. The LMG formation is favoured at low pH in the presence of oxalate as counter-ion.
publishDate 2011
dc.date.none.fl_str_mv 2011-01
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/11336/4929
Rengifo Herrera, Julian Andres; Pizzio, Luis Rene; Blanco, Mirta Noemi; Roussel, Christophe ; Pulgarin, Cesar; Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH; Royal Society of Chemistry; Photochemical and Photobiological Sciences; 10; 1; 1-2011; 29-34
1474-905X
url http://hdl.handle.net/11336/4929
identifier_str_mv Rengifo Herrera, Julian Andres; Pizzio, Luis Rene; Blanco, Mirta Noemi; Roussel, Christophe ; Pulgarin, Cesar; Photocatalytic discoloration of aqueous Malachite Green solutions by UV-illuminated TiO2 nano-particles under air and nitrogen atmospheres: Effects of counter-ions and pH; Royal Society of Chemistry; Photochemical and Photobiological Sciences; 10; 1; 1-2011; 29-34
1474-905X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2011/PP/c0pp00196a
info:eu-repo/semantics/altIdentifier/doi/10.1039/c0pp00196a
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 Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
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
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score 12.982451

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