Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation

Nanotubular TiO2 coatings prepared by anodic oxidation of titanium were evaluated for the first time in the photocatalytic Cr(VI) reduction in the presence of EDTA. Small nanotubes (SN) were prepared by using aqueous hydrofluoric acid as electrolyte, and long nanotubes (LN) were made by using an eth...

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Publicado:	2018
Materias:	Anodic oxidation Heterogeneous photocatalysis Hexavalent chromium TiO2 nanotubes Chromium compounds Coatings Electrolytes Ethylene Ethylene glycol Hydrofluoric acid Nanotubes Oxidation Photocatalysis Scanning electron microscopy X ray diffraction Yarn Ammonium fluoride Diffuse reflectance spectroscopy Ethylene glycol solutions Photocatalytic activities Photocatalytic reactions
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00255408_v97_n_p150_Vera http://hdl.handle.net/20.500.12110/paper_00255408_v97_n_p150_Vera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00255408_v97_n_p150_Vera
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spelling	paper:paper_00255408_v97_n_p150_Vera2025-07-30T17:34:58Z Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation Anodic oxidation Heterogeneous photocatalysis Hexavalent chromium TiO2 nanotubes Chromium compounds Coatings Electrolytes Ethylene Ethylene glycol Hydrofluoric acid Nanotubes Oxidation Photocatalysis Scanning electron microscopy X ray diffraction Yarn Ammonium fluoride Diffuse reflectance spectroscopy Ethylene glycol solutions Heterogeneous photocatalysis Hexavalent chromium Photocatalytic activities Photocatalytic reactions TiO2 nanotubes Anodic oxidation Nanotubular TiO2 coatings prepared by anodic oxidation of titanium were evaluated for the first time in the photocatalytic Cr(VI) reduction in the presence of EDTA. Small nanotubes (SN) were prepared by using aqueous hydrofluoric acid as electrolyte, and long nanotubes (LN) were made by using an ethylene glycol solution containing ammonium fluoride and water. The samples were characterized by scanning electron microscopy, X-ray diffraction and UV–Vis diffuse reflectance spectroscopy. The photocatalytic reactions were performed using [Cr(VI)]0 = 0.8 mM, an EDTA/Cr(VI) molar ratio = 1.25 and pH 2. The photocatalytic activity increased with the applied voltage due to an increase of the average diameter, wall thickness and length of the nanotubes. The most active SN coating yielded 98% of Cr(VI) transformation after 300 min, while all LN samples achieved a complete transformation in the same time or less. The photocatalytic activity was in almost cases higher than that of a P25 supported sample. © 2017 Elsevier Ltd 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00255408_v97_n_p150_Vera http://hdl.handle.net/20.500.12110/paper_00255408_v97_n_p150_Vera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Anodic oxidation Heterogeneous photocatalysis Hexavalent chromium TiO2 nanotubes Chromium compounds Coatings Electrolytes Ethylene Ethylene glycol Hydrofluoric acid Nanotubes Oxidation Photocatalysis Scanning electron microscopy X ray diffraction Yarn Ammonium fluoride Diffuse reflectance spectroscopy Ethylene glycol solutions Heterogeneous photocatalysis Hexavalent chromium Photocatalytic activities Photocatalytic reactions TiO2 nanotubes Anodic oxidation
spellingShingle	Anodic oxidation Heterogeneous photocatalysis Hexavalent chromium TiO2 nanotubes Chromium compounds Coatings Electrolytes Ethylene Ethylene glycol Hydrofluoric acid Nanotubes Oxidation Photocatalysis Scanning electron microscopy X ray diffraction Yarn Ammonium fluoride Diffuse reflectance spectroscopy Ethylene glycol solutions Heterogeneous photocatalysis Hexavalent chromium Photocatalytic activities Photocatalytic reactions TiO2 nanotubes Anodic oxidation Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
topic_facet	Anodic oxidation Heterogeneous photocatalysis Hexavalent chromium TiO2 nanotubes Chromium compounds Coatings Electrolytes Ethylene Ethylene glycol Hydrofluoric acid Nanotubes Oxidation Photocatalysis Scanning electron microscopy X ray diffraction Yarn Ammonium fluoride Diffuse reflectance spectroscopy Ethylene glycol solutions Heterogeneous photocatalysis Hexavalent chromium Photocatalytic activities Photocatalytic reactions TiO2 nanotubes Anodic oxidation
description	Nanotubular TiO2 coatings prepared by anodic oxidation of titanium were evaluated for the first time in the photocatalytic Cr(VI) reduction in the presence of EDTA. Small nanotubes (SN) were prepared by using aqueous hydrofluoric acid as electrolyte, and long nanotubes (LN) were made by using an ethylene glycol solution containing ammonium fluoride and water. The samples were characterized by scanning electron microscopy, X-ray diffraction and UV–Vis diffuse reflectance spectroscopy. The photocatalytic reactions were performed using [Cr(VI)]0 = 0.8 mM, an EDTA/Cr(VI) molar ratio = 1.25 and pH 2. The photocatalytic activity increased with the applied voltage due to an increase of the average diameter, wall thickness and length of the nanotubes. The most active SN coating yielded 98% of Cr(VI) transformation after 300 min, while all LN samples achieved a complete transformation in the same time or less. The photocatalytic activity was in almost cases higher than that of a P25 supported sample. © 2017 Elsevier Ltd
title	Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
title_short	Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
title_full	Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
title_fullStr	Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
title_full_unstemmed	Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation
title_sort	heterogeneous photocatalytic cr(vi) reduction with short and long nanotubular tio2 coatings prepared by anodic oxidation
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00255408_v97_n_p150_Vera http://hdl.handle.net/20.500.12110/paper_00255408_v97_n_p150_Vera
_version_	1840323325335699456

Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation

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