Synergism in TiO2 photocatalytic ozonation for the removal of dichloroacetic acid and thiacloprid

The synergistic effect of the photocatalytic ozonation process (PH-OZ) using photocatalyst TiO2 is usually attributed to influences physicochemical properties catalyst, pollutant type, pH, temperature, O3 concentration, and other factors. It also often claimed that good adsorption on surface beneficial for occurrence synergism. Herein, we tested these assumptions by five different commercial photocatalysts (P25, PC500, PC100, PC10 JRC-TiO-6) in three advanced oxidation systems - photocatalysis (O2/TiO2/UV), catalytic (O3/TiO2) PH-OZ (O3/TiO2/UV) degradation two pollutants (dichloroacetic acid DCAA thiacloprid) simultaneously present water. was much more pronounced case thiacloprid, a molecule with low catalyst contrast stronger adsorption. faster kinetics correlated higher exposed area agglomerates, independent (lower) BET surfaces primary particles. Nevertheless, mineralization than thiacloprid solution. Therefore, propose high crucial fast reactions (DCAA mineralization), while dispersion (small) agglomerates charge separation play an important role or less adsorbed organic (thiacloprid).