Abstract
Photocatalytic methylviologen oxidation in TiO 2 aqueous suspension has been studied. The initial photonic efficiency has been found to increase dramatically as the light intensity decreases, approaching 34% at extremely low light intensity. The maximum photonic efficiency does not depend on methylviologen concentration and pH of the solution. Increasing the surface methylviologen concentration by increasing the methylviologen concentration in the solution or varying pH causes the photonic efficiency comes to its maximum value at a higher intensity of incident light. The light intensity affects the shape of the dependencies of initial rate versus methylviologen concentration. The model explaining the experimental data has been examined. Two parameters of this model appear to be able to characterize the material of TiO 2 photocatalysts in a quite wide range of conditions.
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