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Powder and Nanotubes Titania Modified by Dye Sensitization as Photocatalysts for the Organic Pollutants Elimination

1
Grupo de Catálisis de la Universidad Pedagógica y Tecnológica de Colombia, Avenida Central del Norte 39-115, Tunja 150003, Colombia
2
Departamento de Química Inorgánica / Universidad de Sevilla and Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla—CSIC, Avenida Américo Vespucio, 49, 41092 Seville, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(4), 517; https://doi.org/10.3390/nano9040517
Received: 18 February 2019 / Revised: 29 March 2019 / Accepted: 29 March 2019 / Published: 2 April 2019
(This article belongs to the Special Issue Nano‐Photocatalytic Materials: Possibilities and Challenges)
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Abstract

In this study, titanium dioxide powder obtained by the sol-gel method and TiO2 nanotubes, were prepared. In order to increase the TiO2 photoactivity, the powders and nanotubes obtained were modified by dye sensitization treatment during the oxide synthesis. The sensitizers applied were Quinizarin (Q) and Zinc protoporphyrin (P). The materials synthesized were extensively characterized and it was found that the dye sensitization treatment leads to modify the optical and surface properties of Titania. It was also found that the effectiveness of the dye-sensitized catalysts in the phenol and methyl orange (MO) photodegradation strongly depends on the dye sensitizer employed. Thus, the highest degradation rate for MO was obtained over the conventional Q-TiO2 photocatalyst. In the case of the nanotubes series, the most effective photocatalyst in the MO degradation was based on TiO2-nanotubes sensitized with the dye protoporfirin (ZnP). Selected catalysts were also tested in the phenol and MO photodegradation under visible light and it was observed that these samples are also active under this radiation. View Full-Text
Keywords: TiO2 powders; TiO2 nanotubes; dye-sensitized TiO2; photocatalysis TiO2 powders; TiO2 nanotubes; dye-sensitized TiO2; photocatalysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Murcia, J.J.; Ávila-Martínez, E.G.; Rojas, H.; Cubillos, J.; Ivanova, S.; Penkova, A.; Laguna, O.H. Powder and Nanotubes Titania Modified by Dye Sensitization as Photocatalysts for the Organic Pollutants Elimination. Nanomaterials 2019, 9, 517.

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