The effect of nanometre-sized Au particle loading on TiO2 photocatalysed reduction of bis(2-dipyridyl)disulfide to 2-mercaptopyridine by H2O

Citation
H. Tada et al., The effect of nanometre-sized Au particle loading on TiO2 photocatalysed reduction of bis(2-dipyridyl)disulfide to 2-mercaptopyridine by H2O, PHYS CHEM P, 3(7), 2001, pp. 1376-1382
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
1463-9076 → ACNP
Volume
3
Issue
7
Year of publication
2001
Pages
1376 - 1382
Database
ISI
SICI code
1463-9076(2001)3:7<1376:TEONAP>2.0.ZU;2-W
Abstract
TiO2 photocatalysed reduction of bis(2-dipyridyl)disulfide (RSSR) to 2-merc aptopyridine by H2O is enhanced significantly by incorporation of nanometre -sized Au particles. The rate is strongly dependent on the amount of Au loa ded (x wt.%), passing through a maximum at x similar to0.3, while it is alm ost independent of the Au particle size in the 4.3-11 nm range. Comparison of the effects of Au and Ag loading reveals that the rate constant of the A u(0.25 wt.%)/TiO2 system is greater than that of the Ag(0.24 wt.%)/TiO2 sys tem by a factor of 2.6 and the activation energy of the former is about two -thirds that of the latter. The enhancing effect of the Au loading is discu ssed in terms of kinetic and molecular orbital considerations.