A PROMOTING EFFECT OF NH4F ADDITION ON THE PHOTOCATALYTIC ACTIVITY OFSOL-GEL TIO2 FILMS

Authors
HATTORI A YAMAMOTO M TADA H ITO S
Citation
A. Hattori et al., A PROMOTING EFFECT OF NH4F ADDITION ON THE PHOTOCATALYTIC ACTIVITY OFSOL-GEL TIO2 FILMS, Chemistry Letters, (8), 1998, pp. 707-708
Citations number
14
Categorie Soggetti
Chemistry
Journal title
Chemistry Letters → ACNP
ISSN journal
03667022
Issue
8
Year of publication
1998
Pages
707 - 708
Database
ISI
SICI code
0366-7022(1998):8<707:APEONA>2.0.ZU;2-T
Abstract
The photoreactivity of sol-gel (SG)-TiO2 films was enhanced significan tly with addition of a small amount of ammonium fluoride (AF) into the SO-starting solution. The rate of the TiO2 photoinduced oxidation of an overlying methylsiloxane monolayer reached a maximum near [AF]/[Ti] molar ratio of 1.35 x 10(-2). The apparent rate constant was as much as 8.2 times greater than of AF non-added system. X-Ray diffraction an alyses clearly indicated that the principal factor is the improvement in the anatase crystallinity caused by F ions.