Photocatalytic activity of TiO2 thin films deposited by cathodic arc
In this work, the photocatalytic activity and the kinetic behavior of anatase TiO2 films deposited by cathodic arc (CA films) on glass substrates are reported and compared with those of TiO2 Degussa P-25 films obtained by dip-coating immersion (DC films). The mass density of films, determined by X-r...
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paper:paper_09263373_v101_n3-4_p676_Kleiman2023-06-08T15:51:33Z Photocatalytic activity of TiO2 thin films deposited by cathodic arc Kleiman, Ariel Javier Marquez, Adriana B. Litter, Marta Irene Cathodic arc deposition Cr(VI) photocatalytic reduction Heterogeneous photocatalysis Thin films TiO2 Adhesion properties Anatase TiO Aqueous system Cathodic arc Cathodic arc deposition Coating thickness Cr reductions Degussa Dip coating Glass substrates Heterogeneous photocatalysis Kinetic behavior Mass densities New material Photoactivity Photocatalytic activities Photocatalytic reduction Photoreactors TiO X-ray reflectometry Chromium compounds Coatings Photocatalysis Substrates Thickness measurement Thin films Titanium dioxide Vapor deposition Deposition In this work, the photocatalytic activity and the kinetic behavior of anatase TiO2 films deposited by cathodic arc (CA films) on glass substrates are reported and compared with those of TiO2 Degussa P-25 films obtained by dip-coating immersion (DC films). The mass density of films, determined by X-ray reflectometry was 20% lower for DC films compared with CA films, indicating a higher porosity of DC samples. The activity was evaluated from the efficiency to reduce Cr(VI) in the presence of EDTA. Although the response of CA films resulted lower compared with that of P-25 films of the same TiO2 content (e.g. 90% vs. 50% Cr(VI) reduction after 180min irradiation for samples with 0.03mgcm-2 of TiO2), a fact associated to the lower porosity, adhesion properties of the new materials were much better. CA film photoactivity improved by increasing the coating thickness; after 180min, a sample with 0.03mgcm-2 of TiO2 presented 50% of Cr(VI) reduction vs. 80% for a sample with 0.28mgcm-2. These photocatalysts, whose preparation is simple and affordable, are very promising to be used as immobilized materials in photoreactors for the treatment of pollutants in gaseous and aqueous systems. © 2010 Elsevier B.V. Fil:Kleiman, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Márquez, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Litter, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09263373_v101_n3-4_p676_Kleiman http://hdl.handle.net/20.500.12110/paper_09263373_v101_n3-4_p676_Kleiman |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cathodic arc deposition Cr(VI) photocatalytic reduction Heterogeneous photocatalysis Thin films TiO2 Adhesion properties Anatase TiO Aqueous system Cathodic arc Cathodic arc deposition Coating thickness Cr reductions Degussa Dip coating Glass substrates Heterogeneous photocatalysis Kinetic behavior Mass densities New material Photoactivity Photocatalytic activities Photocatalytic reduction Photoreactors TiO X-ray reflectometry Chromium compounds Coatings Photocatalysis Substrates Thickness measurement Thin films Titanium dioxide Vapor deposition Deposition |
| spellingShingle |
Cathodic arc deposition Cr(VI) photocatalytic reduction Heterogeneous photocatalysis Thin films TiO2 Adhesion properties Anatase TiO Aqueous system Cathodic arc Cathodic arc deposition Coating thickness Cr reductions Degussa Dip coating Glass substrates Heterogeneous photocatalysis Kinetic behavior Mass densities New material Photoactivity Photocatalytic activities Photocatalytic reduction Photoreactors TiO X-ray reflectometry Chromium compounds Coatings Photocatalysis Substrates Thickness measurement Thin films Titanium dioxide Vapor deposition Deposition Kleiman, Ariel Javier Marquez, Adriana B. Litter, Marta Irene Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| topic_facet |
Cathodic arc deposition Cr(VI) photocatalytic reduction Heterogeneous photocatalysis Thin films TiO2 Adhesion properties Anatase TiO Aqueous system Cathodic arc Cathodic arc deposition Coating thickness Cr reductions Degussa Dip coating Glass substrates Heterogeneous photocatalysis Kinetic behavior Mass densities New material Photoactivity Photocatalytic activities Photocatalytic reduction Photoreactors TiO X-ray reflectometry Chromium compounds Coatings Photocatalysis Substrates Thickness measurement Thin films Titanium dioxide Vapor deposition Deposition |
| description |
In this work, the photocatalytic activity and the kinetic behavior of anatase TiO2 films deposited by cathodic arc (CA films) on glass substrates are reported and compared with those of TiO2 Degussa P-25 films obtained by dip-coating immersion (DC films). The mass density of films, determined by X-ray reflectometry was 20% lower for DC films compared with CA films, indicating a higher porosity of DC samples. The activity was evaluated from the efficiency to reduce Cr(VI) in the presence of EDTA. Although the response of CA films resulted lower compared with that of P-25 films of the same TiO2 content (e.g. 90% vs. 50% Cr(VI) reduction after 180min irradiation for samples with 0.03mgcm-2 of TiO2), a fact associated to the lower porosity, adhesion properties of the new materials were much better. CA film photoactivity improved by increasing the coating thickness; after 180min, a sample with 0.03mgcm-2 of TiO2 presented 50% of Cr(VI) reduction vs. 80% for a sample with 0.28mgcm-2. These photocatalysts, whose preparation is simple and affordable, are very promising to be used as immobilized materials in photoreactors for the treatment of pollutants in gaseous and aqueous systems. © 2010 Elsevier B.V. |
| author |
Kleiman, Ariel Javier Marquez, Adriana B. Litter, Marta Irene |
| author_facet |
Kleiman, Ariel Javier Marquez, Adriana B. Litter, Marta Irene |
| author_sort |
Kleiman, Ariel Javier |
| title |
Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| title_short |
Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| title_full |
Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| title_fullStr |
Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| title_full_unstemmed |
Photocatalytic activity of TiO2 thin films deposited by cathodic arc |
| title_sort |
photocatalytic activity of tio2 thin films deposited by cathodic arc |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09263373_v101_n3-4_p676_Kleiman http://hdl.handle.net/20.500.12110/paper_09263373_v101_n3-4_p676_Kleiman |
| work_keys_str_mv |
AT kleimanarieljavier photocatalyticactivityoftio2thinfilmsdepositedbycathodicarc AT marquezadrianab photocatalyticactivityoftio2thinfilmsdepositedbycathodicarc AT littermartairene photocatalyticactivityoftio2thinfilmsdepositedbycathodicarc |
| _version_ |
1768541804666290176 |