Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)

Fil: Traid, Hernán Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico (Nordeste). Instituto de Materiales de Misiones; Argentina.

Detalles Bibliográficos
Autores principales: Traid, Hernán Darío, Vera, María Laura, Ares, Alicia Esther, Litter, Marta Irene
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: Elsevier 2017
Materias:
TiO2 coatings
Anodic oxidation
Cr(VI) reduction
Heterogeneous photocatalysis
Acceso en línea:https://hdl.handle.net/20.500.12219/4436
Aporte de:
Repositorio Institucional Digital de la UNaM (RIDUNAM) de Universidad Nacional de Misiones
id I77-R195-20.500.12219-4436
record_format dspace
spelling I77-R195-20.500.12219-44362024-06-04T11:20:34Z Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI) Traid, Hernán Darío Vera, María Laura Ares, Alicia Esther Litter, Marta Irene TiO2 coatings Anodic oxidation Cr(VI) reduction Heterogeneous photocatalysis Fil: Traid, Hernán Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico (Nordeste). Instituto de Materiales de Misiones; Argentina. Fil: Traid, Hernán Darío. Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Instituto de Materiales de Misiones; Argentina. Fil: Vera, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico (Nordeste). Instituto de Materiales de Misiones; Argentina. Fil: Vera, María Laura. Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Instituto de Materiales de Misiones; Argentina. Fil: Ares, Alicia Esther. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico (Nordeste). Instituto de Materiales de Misiones; Argentina. Fil: Ares, Alicia Esther. Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Instituto de Materiales de Misiones; Argentina. Fil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Litter, Marta Irene. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes. Gerencia Química; Argentina. Fil: Litter, Marta Irene. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Porous TiO2 coatings were obtained by anodic oxidation in spark discharge conditions, varying the range of current density (200–3000 A m−2) and the electrolyte concentration (H2SO4; 1 and 4 M). The samples were characterized by SEM, XRD and DRS. The photocatalytic activity was evaluated using the Cr(VI)/EDTA reductive system to find the optimal conditions for a high photocatalytic activity. A higher electrolyte concentration increased the pore diameter, the porous fraction and the coating thickness and, consequently, the photocatalytic activity; a higher current density improved the performance of coatings. A relationship between the anatase fraction and the photocatalytic activity of the samples was demonstrated, with a maximum activity close to 0.65 anatase fraction. The thermal treatment of the anodic coatings improved also the photocatalytic activity, without changes on neither the morphology nor the anatase fraction. The maximum Cr(VI) transformation achieved by the most active coating was 89.1% while a coating prepared with Evonik P25 achieved only 69.9%. The obtained TiO2 anodic coatings present great potential for application in heterogeneous photocatalysis processes in water and wastewater treatment as supported photocatalysts. 2017-04-15 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://hdl.handle.net/20.500.12219/4436 eng info:eu-repo/semantics/altIdentifier/urn/https://www.sciencedirect.com/science/article/abs/pii/S0254058417300603 info:eu-repo/semantics/openAccess application/pdf application/pdf 1.880 MB Elsevier
institution Universidad Nacional de Misiones
institution_str I-77
repository_str R-195
collection Repositorio Institucional Digital de la UNaM (RIDUNAM)
language Inglés
topic TiO2 coatings
Anodic oxidation
Cr(VI) reduction
Heterogeneous photocatalysis
spellingShingle TiO2 coatings
Anodic oxidation
Cr(VI) reduction
Heterogeneous photocatalysis
Traid, Hernán Darío
Vera, María Laura
Ares, Alicia Esther
Litter, Marta Irene
Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
topic_facet TiO2 coatings
Anodic oxidation
Cr(VI) reduction
Heterogeneous photocatalysis
description Fil: Traid, Hernán Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico (Nordeste). Instituto de Materiales de Misiones; Argentina.
format Artículo
Artículo
publishedVersion
author Traid, Hernán Darío
Vera, María Laura
Ares, Alicia Esther
Litter, Marta Irene
author_facet Traid, Hernán Darío
Vera, María Laura
Ares, Alicia Esther
Litter, Marta Irene
author_sort Traid, Hernán Darío
title Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
title_short Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
title_full Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
title_fullStr Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
title_full_unstemmed Advances on the synthesis of porous TiO2 coatings by anodic spark oxidation : photocatalytic reduction of Cr(VI)
title_sort advances on the synthesis of porous tio2 coatings by anodic spark oxidation : photocatalytic reduction of cr(vi)
publisher Elsevier
publishDate 2017
url https://hdl.handle.net/20.500.12219/4436
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