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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todo:paper_00255408_v97_n_p150_Vera2023-10-03T14:36:06Z Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO2 coatings prepared by anodic oxidation Vera, M.L. Traid, H.D. Henrikson, E.R. Ares, A.E. Litter, M.I. 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 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 |
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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 Vera, M.L. Traid, H.D. Henrikson, E.R. Ares, A.E. Litter, M.I. 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 |
| format |
JOUR |
| author |
Vera, M.L. Traid, H.D. Henrikson, E.R. Ares, A.E. Litter, M.I. |
| author_facet |
Vera, M.L. Traid, H.D. Henrikson, E.R. Ares, A.E. Litter, M.I. |
| author_sort |
Vera, M.L. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00255408_v97_n_p150_Vera |
| work_keys_str_mv |
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1807322215519092736 |