E. Stathatos et al., Titanium dioxide films made from reverse micelles and their use for the photocatalytic degradation of adsorbed dyes, COLL SURF A, 149(1-3), 1999, pp. 49-56
Citations number
17
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Titanium dioxide mesoporous films have been deposited on glass slides by di
p-coating in reverse micellar gels containing titanium isopropoxide. Revers
e micelles were first made in cyclohexane, and the alkoxide was added last.
Hydrolysis and inorganic polymerization produced composite organic/inorgan
ic gels that were deposited on glass slides giving uniform transparent film
s. Calcination at 450 degrees C gave TiO2, nanoparticle mesoporous films. T
he films possessed a high capacity for adsorption of several different dyes
from aqueous or alcoholic solutions. Illumination of the colored films by
visible light led to a rapid degradation of the adsorbed dyes. The phenomen
on is explained by a photosensitisation process involving the semiconductor
and the adsorbed dye itself [N. Chouhaid, K. Vinodgopal, L. Fisher, S. Hot
chandani, A.K. Chattopadhyay, P. Kamat, J. Phys. Chem. 100 (1996) 8436]. Th
e differences between films made by varying some parameters are discussed.
(C) 1999 Elsevier Science B.V. All rights reserved.