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Effect of the irradiation wavelength on the performance of nanoporous carbon as an additive to TiO2

AuthorsAndrade, Marta A.; Mestre, Ana S.; Jiménez Carmona, Rocío ; Carvalho, A. P.; Ovín Ania, María Concepción
KeywordsSisal-based nanoporous carbons
TiO2/carbon photocatalysts
UV and visible light
Phenol photocatalytic degradation
Issue Date28-Sep-2015
CitationApplied Catalysis A - General 507: 91-98 (2015)
AbstractWe report the dependence of the photochemical activity of titania/carbon hybrid catalysts toward the degradation of phenol from solution using polychromatic light and filters. In all cases larger photooxidative efficiencies were obtained using light at 200 nm < λ < 600 nm. The incorporation of a carbon additive to TiO2 increased the photocatalytic performance regardless the illumination conditions, although, the effect was more pronounced at λ > 200 nm. The photocatalytic runs carried out with the nonporous carbon alone confirmed a certain level of intrinsic photoactivity under both irradiation conditions. Nevertheless, a clear deactivation was evident after 60 min of irradiation suggesting that the photoactive sites in the carbon are either consumed or deactivated in the course of the reaction. The composition of the catalyst and the illumination conditions also have a strong effect on the nature of the degradation intermediates, with a marked regioselectivity toward ortho-substitution at high energy photons and when the carbon component is added to the catalyst composition.
Publisher version (URL)http://dx.doi.org/10.1016/j.apcata.2015.09.036
Appears in Collections:(INCAR) Artículos
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