Role of interface contact in CeO2-TiO2 photocatalytic composite materials
| Autor: | Marcos Fernández-García, María N. Gómez-Cerezo, Mario J. Muñoz-Batista, David Tudela, Anna Kubacka |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Universidad Autónoma de Madrid |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | The role of interface contact between two oxides, CeO2 and TiO2, for the photocatalytic elimination of toluene is examined in a series of samples with variable quantities of ceria. Samples having ceria contents in the 1 to 10 mol % range improve significantly, exhibiting up to 3.5 times the activity of the bare nano-TiO2 catalyst. To interpret the photocatalytic behavior, this contribution develops a novel spectro-kinetic approach where a joined analysis of the kinetics of the reaction and the fate of charge charriers is merged with the mathematical modeling of the light–catalyst interaction at the photoreactor. This produces a self-consistent approach that simultaneously validates the kinetic model and interprets the activity on rigorous bases. The study is completed with a multitechnique examination of the solids using X-ray diffraction and electron paramagnetic resonance, UV–vis, and X-ray photoelectron spectroscopies as well as high-resolution transmission electron microscopy. The results provide quantitative evidence that the oxide–oxide contact controls the photoactivity through the number of hole-related species available at the surface of the composite materials and that this number is in turn related to the stabilization of reduced Ce species present at the Ce–Ti interface. A.K. and M.J.M.-B. thank MINECO for support through the postdoctoral “Ramon y Cajal ́ ” and predoctoral FPI programs, respectively. M.N.G.-C. also acknowledges financial support by UAM. Financial support by MINECO (Project CTQ2010- 14872/BQU) is also acknowledged. D |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|