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    Photocatalytic Activity of Nanostructured Anatase Coatings Obtained by Cold Gas Spray

    Year: 2014

    Journal: JOURNAL OF THERMAL SPRAY TECHNOLOGY, Vol. 23, p 1135-1141, 20150722

    Authors: Gardon, M.; Fernandez-Rodriguez, C.; Garzon Sousa, D.; Dona-Rodriguez, J. M.; Dosta, S.; Cano, I. G.; Guilemany, J. M.

    Organizations: Univ Barcelona, Thermal Spray Ctr, CPT, E-08028 Barcelona, Spain; Univ Las Palmas Gran Canaria, CIDIA Dpto Quim, Grp Fotocatalisis & Espectroscopia Aplicada Medio, Unidad Asociada ICMSE CSIC, Las Palmas Gran Canaria 35017, Spain

    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(A (R)) 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.