Title of article :
Photocatalytic activities of nanocrystalline Si-modified titania
xerogels prepared by the glycothermal method
Author/Authors :
Hirotaka Ozaki، نويسنده , , Kazuko Saito، نويسنده , , Shinji Iwamoto، نويسنده , , Masashi Inoue، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Abstract :
Xerogels of nanocrystalline Si-modified titanias
having large surface areas and superior thermal
stabilities were obtained by the glycothermal method, followed
by the removal of the organic phase by flash
evaporation, and their physicochemical and photocatalytic
properties were investigated. With the increase in the
amount of Si addition, the crystallite size of the sample
decreased and BET surface area increased. The zeta
potential shifted to the more negative side by Si addition,
which affected the adsorbability of dyes. The obtained
xerogels of Si-modified titanias were effective photocatalysts
for decomposition of organic dyes and exhibited
higher activities compared to JRC-TIO-4. Xerogel samples
were highly dispersed in aqueous solutions because the
coagulation, which may occur during the drying stage in
the sample preparation, was effectively prevented and this
feature is one of the critical factors for the high activities of
the xerogel catalysts. Their effectiveness for photocatalytic
decomposition of cationic dyes was remarkable since the
negative surface charge of the catalysts enhanced the
adsorbability for these dyes
Journal title :
Journal of Materials Science
Journal title :
Journal of Materials Science