Ammonia-induced reduction treatment of titanium dioxide rutile nanorods has been performed, where the treatment triggered a synergistic surface modification of titania electrodes that enhanced its overall photoelectrochemical performance, besides introducing a new absorption band in the 420−480 nm range. A physical model has been proposed to reveal the role of each fundamental interfacial property on the observed behavior. On the one hand, by tuning the Fermi level position, charge separation was optimized by adjusting the depletion region width to maximize the potential drop inside titanium dioxide and also filling the surface states, which in turn decreased electron−hole recombination. On the other hand, by increasing the density of surface holes traps (identified as surface hydroxyl groups), the average hole lifetime was extended, depicting a more efficient hole transfer to electrolyte species. The proposed model could serve as a rationale for controlled interfacial adjustment of nanostructured photoelectrodes tailoring them for the required application.
Se estudió la contaminación del aire a filo de calle en el Centro Histórico de Quito (DMQ) en un punto de alto flujo vehicular mediante el monitoreo continuo de gases y material particulado entre el 5 y 12 de abril de 2018. Se obtuvieron los perfiles horarios de las concentraciones de contaminantes y se pudo explicar su comportamiento. Las mediciones en el estudio no sobrepasaron los límites permisibles nacionales ni internacionales de calidad del aire; sin embargo se observaron picos anómalos en el caso del dióxido de azufre. Se evaluó la correlación cruzada de las series de tiempo entre los datos reportados por estaciones regionales de la secretaria de ambiente del dmq y los datos obtenidos en este estudio, hallándose que el monóxido de carbono presenta una mayor concentración a filo de calle. Al realizar el análisis de componentes principales (acp) se determinó varios contaminantes correlacionados, lo que corroboran sus ciclos de formación y demuestran la influencia de factores meteorológicos en la contaminación de aire a filo de calle. Finalmente se determinó que las concentraciones de pm10 en aire interior son mayores a lo registrado en aire exterior en el sitio de muestreo.
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