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Abstract
The formation of reactive singlet oxygen molecule (1O2), the a1Δg state of excited O2, in the photocatalytic TiO2 aqueous suspension system was shown to be evident by detecting the near-infrared phosphorescence at 1270 nm by means of a gated photon counting method. The lifetimes of O2(1Δg) in three different media (water, ethanol, 1∶1 water–ethanol mixture) were elucidated and compared with those reported in corresponding homogeneous media. Based on the comparison of the lifetime with those of the other reactive species such as OH radicals and trapped holes, the contribution of 1O2 to the actual photocatalytic procedure was discussed.
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