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Photocatalytic Activity of Nanostructured Anatase Coatings Obtained by Cold Gas Spray

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Abstract

This article describes a photocatalytic nanostructured anatase coating deposited by cold gas spray (CGS) supported on titanium sub-oxide (TiO2−x ) coatings obtained by atmospheric plasma spray (APS) onto stainless steel cylinders. The photocatalytic coating was homogeneous and preserved the composition and nanostructure of the starting powder. The inner titanium sub-oxide coating favored the deposition of anatase particles in the solid state. Agglomerated nano-TiO2 particles fragmented when impacting onto the hard surface of the APS TiO2−x bond coat. The rough surface provided by APS provided an ideal scenario for entrapping the nanostructured particles, which may be adhered onto the bond coat due to chemical bonding; a possible bonding mechanism is described. Photocatalytic experiments showed that CGS nano-TiO2 coating was active for photodegrading phenol and formic acid under aqueous conditions. The results were similar to the performance obtained by competitor technologies and materials such as dip-coating P25® photocatalysts. Disparity in the final performance of the photoactive materials may have been caused by differences in grain size and the crystalline composition of titanium dioxide.

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Acknowledgments

The authors wish to thank the Generalitat de Catalunya for the financial support for this research through project 2009 SGR 00390; as well as the Spanish Ministry of Science and Innovation for their financial support through the projects CTQ2008-05961-C02-02 and IPT-2011-1113-310000.

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Authors and Affiliations

  1. Thermal Spray Centre, CPT, University of Barcelona, Martí i Franquès, 1, 08028, Barcelona, Spain

    M. Gardon, S. Dosta, I. G. Cano & J. M. Guilemany

  2. Grupo de Fotocatálisis y Espectroscopía Aplicada al Medioambiente-FEAM (Unidad Asociada al ICMSE-C.S.I.C.), CIDIA-Dpto. de Química, Parque Científico-Tecnológico, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017, Las Palmas, Spain

    C. Fernández-Rodríguez, D. Garzón Sousa & J. M. Doña-Rodríguez

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  1. M. Gardon
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  2. C. Fernández-Rodríguez
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  3. D. Garzón Sousa
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  4. J. M. Doña-Rodríguez
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  6. I. G. Cano
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  7. J. M. Guilemany
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Correspondence to M. Gardon.

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Gardon, M., Fernández-Rodríguez, C., Garzón Sousa, D. et al. Photocatalytic Activity of Nanostructured Anatase Coatings Obtained by Cold Gas Spray. J Therm Spray Tech 23, 1135–1141 (2014). https://doi.org/10.1007/s11666-014-0087-0

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  • DOI: https://doi.org/10.1007/s11666-014-0087-0

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