open access

https://hdl.handle.net/2115/48656

Absorption and action spectra analysis of ammonium fluoride-doped titania photocatalysts

英語

2011

Royal Society of Chemistry

Physical Chemistry Chemical Physics

13(40)

18217-18227

The 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.

学術雑誌論文

Accepted Manuscript

Phys. Chem. Chem. Phys., 2011, 13, 18217-18227 - Reproduced by permission of the PCCP Owner Societies

1463-9076

1463-9084