Preparation of Nanostructured TiO2 Films with High Catalytic Activity and their 3D-Spatial Distribution of Anatase and Rutile Phases
[EN] In this study, a facile, cheap, scalable, and environmentally friendly method has been developed to prepare nanostructured TiO2 coatings with a high catalytic activity. In addition, a protocol to characterize the prepared films in order to obtain consistent results between their structure, thei...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/229060 |
| Acceso en línea: | http://hdl.handle.net/10261/229060 |
| Access Level: | acceso abierto |
| Palabra clave: | Anatase Rutile Coatings Dip-coating Catalysis Confocal micro-Raman |
| Sumario: | [EN] In this study, a facile, cheap, scalable, and environmentally friendly method has been developed to prepare nanostructured TiO2 coatings with a high catalytic activity. In addition, a protocol to characterize the prepared films in order to obtain consistent results between their structure, their microstructure, and their catalytic behavior, has been established. For that, two types of TiO2 coatings have been fabricated by applying once TiO2 aqueous suspensions, prepared form commercial nanopowders, by immersion followed by an adequate thermal treatment. The first type of films is constituted by coatings with anatase as single phase, and the second one by films with a rutile molar fraction of XR = 0.07 0.02, determined from grazing incidence X-ray diffraction (GI-XRD) data. High spatial resolution chemical imaging, obtained by confocal Raman microscopy (CRM), of the surface and of the cross-section for the films shows a good distribution of rutile without any segregation of this phase. Furthermore, high resolution electron microscopy (HREM) confirmed the presence of anatase/rutile biphasic domains in those areas in which both phases were previously found together by CRM. In addition, the catalytic data fit to a first-order kinetic model with high catalytic reaction constants (k’), especially when rutile is present. Furthermore, consistent results have been found in this study between textural, structural and microstructural features with catalytic properties for the prepared TiO2 films. |
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