2134/37376
Anisoara Vancea
Anisoara
Vancea
Iain Kirkpatrick
Iain
Kirkpatrick
David Worrall
David
Worrall
Sian L. Williams
Sian L.
Williams
Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces
Loughborough University
2019
Silica
Titania
Photocatalysis
Energy / electron transfer
Diffusion
Reflectance
Chemical Sciences not elsewhere classified
2019-03-28 14:33:38
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Energy_and_electron_transfer_reactions_on_silica_gel_and_titania-silica_mixed_oxide_surfaces/9226130
The energy and electron transfer reactions of anthracene co-adsorbed with an electron donor on silica gel and titania-silica mixed oxides have been studied by a combination of steady state reflectance, emission spectroscopy, and nanosecond diffuse reflectance laser flash photolysis. Bimolecular rate constants for energy and electron transfer between anthracene and azulene have been measured; kinetic analysis of the decay of the anthracene triplet state and radical cation show that the kinetic parameters depend on the titania content of the sample and the azulene loading. The rate of energy and electron transfer reactions increases as a function of azulene loading and decreases with increasing titania content in titania-silica mixed oxides. These findings indicate that the observed rate of reaction is determined by the rate of diffusion of anthracene on the titania-silica surfaces whereas, in contrast, the observed rate of reaction on silica gel is predominantly governed by the rate of diffusion of azulene.