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Open AccessFeature PaperArticle

Photocatalytic Activity of Nanotubular TiO2 Films Obtained by Anodic Oxidation: A Comparison in Gas and Liquid Phase

1
Department of Chemistry, Materials and Chemical Engineering “G. Natta” Politecnico di Milano, Via Mancinelli 7, Milan 20131, Italy
2
ITC-CNR, Construction Technologies Institute, Viale Lombardia 49, San Giuliano Milanese, Milan 20098, Italy
3
Department of Energy, Politecnico di Milano, Via Ponzio 34/3, Milan 20133, Italy
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 488; https://doi.org/10.3390/ma11040488
Received: 20 February 2018 / Revised: 12 March 2018 / Accepted: 20 March 2018 / Published: 24 March 2018
(This article belongs to the Special Issue Novel Photoactive Materials)
The availability of immobilized nanostructured photocatalysts is of great importance in the purification of both polluted air and liquids (e.g., industrial wastewaters). Metal-supported titanium dioxide films with nanotubular morphology and good photocatalytic efficiency in both environments can be produced by anodic oxidation, which avoids release of nanoscale materials in the environment. Here we evaluate the effect of different anodizing procedures on the photocatalytic activity of TiO2 nanostructures in gas and liquid phases, in order to identify the most efficient and robust technique for the production of TiO2 layers with different morphologies and high photocatalytic activity in both phases. Rhodamine B and toluene were used as model pollutants in the two media, respectively. It was found that the role of the anodizing electrolyte is particularly crucial, as it provides substantial differences in the oxide specific surface area: nanotubular structures show remarkably different activities, especially in gas phase degradation reactions, and within nanotubular structures, those produced by organic electrolytes lead to better photocatalytic activity in both conditions tested. View Full-Text
Keywords: nanostructured materials; titanium dioxide; anodizing; photocatalysis; toluene; rhodamine B nanostructured materials; titanium dioxide; anodizing; photocatalysis; toluene; rhodamine B
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MDPI and ACS Style

Sanabria Arenas, B.E.; Strini, A.; Schiavi, L.; Li Bassi, A.; Russo, V.; Del Curto, B.; Diamanti, M.V.; Pedeferri, M. Photocatalytic Activity of Nanotubular TiO2 Films Obtained by Anodic Oxidation: A Comparison in Gas and Liquid Phase. Materials 2018, 11, 488.

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