Journal Title
Title of Journal:
|
|
|
Publisher
Springer, Dordrecht
|
|
|
|
|
|
Authors: D Bockelmann M Lindner D Bahnemann
Publish Date: 1996
Volume: , Issue: , Pages: 675-689
Abstract
Colloidal Ti/Fe mixed oxide nanoparticles were synthesized in aqueous solution with the Fe3+content varying from 005 up to 50 at and particle diameters between 4 and 6 nm The absorption spectra of these particles could be shifted considerably into the visible part of the solar spectrum with increasing content of ferric ions The photophysical properties of the newly synthesized particles were examined in detail Steady state illumination experiments showed a reversible bleaching of the absorption spectrum in the presence of a hole scavenger indicating that a negative excess charge could be stored The origin of the bleaching was studied in detail using timeresolved flash photolysis measurements The photocatalytic activity of the Ti/Fe mixed oxide particles was compared to that of pure colloidal TiO2 by studying the photooxidation of dichloroacetate DCA in acidic and alkaline media It could be demonstrated that the incorporation of iron into TiO2 leads to an enhancement of the degradation efficiency especially in acidic solutions However a release of FeII was observed during the course of these detoxification reactions evincing that the newly synthesized catalyst partially photocorrodes Strategies are suggested to suppress this cathodic process
Keywords:
.
|
Other Papers In This Journal:
|