268 research outputs found
Absorption and action spectra analysis of ammonium fluoride-doped titania photocatalysts
No full textThe photocatalytic behaviour of a series of ammonium fluoride (NH4F)-doped titania (TiO2) photocatalysts was investigated in the decomposition of acetic acid in aqueous suspensions and in the gas phase mineralization of acetaldehyde. Very similar photocatalytic activity trends, usually increasing with increasing the calcination temperature for a given nominal dopant amount, were obtained for the two test reactions. Moderately doped TiO2 calcined at 700 °C, consisting of pure anatase, was the best performing photocatalyst in both reactions. The photocatalytic oxidation of acetic acid was investigated systematically as a function of irradiation wavelength, by collecting so-called action spectra. By comparing the shapes of the action spectra with those of the absorption spectra of the investigated photocatalysts a model is proposed, based on spectral features deconvolution, which allows a clear distinction between inactive light absorption and effective photoactivity in acetic acid decomposition
Photocatalysis A to Z : What we know and what we do not know in a scientific sense
No full textTopics, in alphabetical order from "Activity", "Band structure" and "Crystallinity" to "X-ray photoelectron spectroscopy", "Yield" and "Z-scheme photocatalysis", related to photocatalysis and photoelectrochemical reaction are discussed with interpretation of what we know and what we don't know in a scientific sense
Themes and Issues in Mathematics Education Concerning Task Design: Editorial Introduction
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