Langmuir,19(6),1935-1937 (2003)
Photocatalytic Reaction Sites at the TiO2
Surface as Studied by Slid-Sate 1H-NMR Spectroscopy
(Abstract)
The adsorption
and photodecomposition of ethanol that was employed as a model substrate of
organic pollutants were investigated in the presence of adsorbed water with TiO2
by solid-state 1H-NMR spectroscopy in order to obtain the
information about the actual photocatalytic reaction sites of organic
pollutants on TiO2 photocatalysts. Consequently it was revealed that
ethanol molecules in practical conditions as contaminants were firmly captured
in mobile physisorbed water layers to be photo decomposed to CO2 and
water after photo illumination, suggesting that actual photocatalytic reactions
should proceed in physisorbed water layers.
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