Depth dependence of the photocatalytic reaction rate. kinetic model generalization

The model for photodegradation with a modified rate constant that was developed and presented in previous study, was generalized for the application of ZnO-based photocatalyst in both thin film and powder form. The applicability of the model was proved on methylene blue discoloration on both types of photocatalysts. The photocatalytic reaction rate was found to be dependent on the depth of the solution in case of small depths for this photocatalyst. This correlataion was valid in both high and low transparency. In addition, the impact of the solution pH on the model pollutant decomposition rate was defined.