Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism

Sol gel prepared tungsten (VI) doped TiO2 powders were evaluated as photocatalysts for crystal violet (CV) bleaching under UV irradiation, in the presence of oxygen. The incorporation of the hexavalent cation affects both surface and bulk properties. The optimum activity observed results from the co...

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Autores principales:	Candal, Roberto Jorge, Jobbagy, Matias
Publicado:	2008
Materias:	Doping (additives) Photobleaching Photodegradation Positive ions Titanium dioxide Tungsten Crystal violet (CV) bleaching Hexavalent cations Photocatalysts
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v112_n4_p1094_Couselo http://hdl.handle.net/20.500.12110/paper_19327447_v112_n4_p1094_Couselo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_19327447_v112_n4_p1094_Couselo
record_format	dspace
spelling	paper:paper_19327447_v112_n4_p1094_Couselo2023-06-08T16:31:27Z Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism Candal, Roberto Jorge Jobbagy, Matias Doping (additives) Photobleaching Photodegradation Positive ions Titanium dioxide Tungsten Crystal violet (CV) bleaching Hexavalent cations Photocatalysts Sol gel prepared tungsten (VI) doped TiO2 powders were evaluated as photocatalysts for crystal violet (CV) bleaching under UV irradiation, in the presence of oxygen. The incorporation of the hexavalent cation affects both surface and bulk properties. The optimum activity observed results from the competition between higher surface areas and lower specific activities per adsorption site. At pH 4.0, doped particles share a common photodegradation mechanism, where the relative contribution of the aromatic structure rupture over the loss of terminal methyl groups (N-demethylation) is more relevant than in the case of non-doped titania. This behavior can be minimized shifting the pH into basic condition. © 2008 American Chemical Society. Fil:Candal, R.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jobbágy, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v112_n4_p1094_Couselo http://hdl.handle.net/20.500.12110/paper_19327447_v112_n4_p1094_Couselo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Doping (additives) Photobleaching Photodegradation Positive ions Titanium dioxide Tungsten Crystal violet (CV) bleaching Hexavalent cations Photocatalysts
spellingShingle	Doping (additives) Photobleaching Photodegradation Positive ions Titanium dioxide Tungsten Crystal violet (CV) bleaching Hexavalent cations Photocatalysts Candal, Roberto Jorge Jobbagy, Matias Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
topic_facet	Doping (additives) Photobleaching Photodegradation Positive ions Titanium dioxide Tungsten Crystal violet (CV) bleaching Hexavalent cations Photocatalysts
description	Sol gel prepared tungsten (VI) doped TiO2 powders were evaluated as photocatalysts for crystal violet (CV) bleaching under UV irradiation, in the presence of oxygen. The incorporation of the hexavalent cation affects both surface and bulk properties. The optimum activity observed results from the competition between higher surface areas and lower specific activities per adsorption site. At pH 4.0, doped particles share a common photodegradation mechanism, where the relative contribution of the aromatic structure rupture over the loss of terminal methyl groups (N-demethylation) is more relevant than in the case of non-doped titania. This behavior can be minimized shifting the pH into basic condition. © 2008 American Chemical Society.
author	Candal, Roberto Jorge Jobbagy, Matias
author_facet	Candal, Roberto Jorge Jobbagy, Matias
author_sort	Candal, Roberto Jorge
title	Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
title_short	Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
title_full	Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
title_fullStr	Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
title_full_unstemmed	Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism
title_sort	tungsten-doped tio2 vs pure tio2 photocatalysts: effects on photobleaching kinetics and mechanism
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v112_n4_p1094_Couselo http://hdl.handle.net/20.500.12110/paper_19327447_v112_n4_p1094_Couselo
work_keys_str_mv	AT candalrobertojorge tungstendopedtio2vspuretio2photocatalystseffectsonphotobleachingkineticsandmechanism AT jobbagymatias tungstendopedtio2vspuretio2photocatalystseffectsonphotobleachingkineticsandmechanism
_version_	1768543630188871680

Tungsten-doped TiO2 vs pure TiO2 photocatalysts: Effects on photobleaching kinetics and mechanism

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