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Artículo

Photocatalytic activity of TiO2 films prepared by cathodic arc deposition: Dependence on thickness and reuse of the photocatalysts

Kleiman, Ariel JavierIcon ; Meichtry, Jorge MartinIcon ; Vega, D.; Litter, Marta IreneIcon ; Marquez, Adriana BeatrizIcon
Fecha de publicación: 11/2019
Editorial: Elsevier Science SA
Revista: Surface and Coatings Technology
ISSN: 0257-8972
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Físico-Química, Ciencia de los Polímeros, Electroquímica

Resumen

In this work, the photocatalytic activity of anatase films with thicknesses up to 1100 nm prepared by cathodic arc deposition (CAD) on glass substrates is reported. The photocatalytic activity under UV–Vis irradiation (λ > 330 nm) was evaluated through the efficiency in the reduction of 0.80 mM Cr(VI) in the presence of 1 mM ethylenediaminetetraacetic acid (EDTA) at pH 2, and compared with the performance of samples obtained by dip-coating using commercial P25. The CAD films were optically transparent, with visible light transmittance ≥ 50% even for the thickest samples. The photocatalytic efficiency of the films increased as the thickness increased. The possibility of obtaining thicker films allowed cathodic arc films reaching better performance than P25 samples. For the most active films obtained by CAD, complete Cr(VI) reduction could be obtained in <300 min under a 28 W m−2 UV-A irradiance. The photocatalytic reaction for all the studied TiO2 films obeyed pseudo-first order kinetics. A decrease of the reaction rate constant was observed for both types of films after reusing the photocatalysts. The fate of the reduced Cr(VI) was also analyzed.
Palabras clave: CATHODIC ARCS , CR(VI) PHOTOCATALYTIC REDUCTION , HETEROGENEOUS PHOTOCATALYSIS , PHOTOCATALYST REUSE , THIN FILMS , TITANIUM DIOXIDE
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/124178
URL: https://linkinghub.elsevier.com/retrieve/pii/S0257897219311454
DOI: http://dx.doi.org/10.1016/j.surfcoat.2019.125154
Colecciones
Articulos (IIIA)
Articulos de INSTITUTO DE INVESTIGACION E INGENIERIA AMBIENTAL
Articulos(INFINA)
Articulos de INST.DE FISICA DEL PLASMA
Citación
Kleiman, Ariel Javier; Meichtry, Jorge Martin; Vega, D.; Litter, Marta Irene; Marquez, Adriana Beatriz; Photocatalytic activity of TiO2 films prepared by cathodic arc deposition: Dependence on thickness and reuse of the photocatalysts; Elsevier Science SA; Surface and Coatings Technology; 382; 11-2019; 1-8
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