| Abstract
| - The one-electron reduction of methyl viologen (MV2+) mediated by the carbon dioxide radical anion(CO2•-) during photocatalytic reactions in a colloidal TiO2 aqueous solution (pH 2) has been investigatedby time-resolved absorption spectroscopy. The formation of MV•+ generated from the one-electron reductionreaction with CO2•-, which is generated from the one-electron oxidation reactions with the photogeneratedholes (h+), was directly observed. The spectral features of the photogenerated charge carriers and thekinetic analysis of the formation process of MV•+ revealed that the CO2•-, desorbed from the surface, reactswith MV2+ via a homogeneous electron-transfer process in the bulk solution.
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