Durability of Ag-TiO₂ Photocatalysts Assessed for the Degradation of Dichloroacetic Acid

Figure 5

Removal of DCA (TOC removal) after 4 hours of illumination using the photocatalyst P25-TiO₂ at pH 3 in 3 consecutive runs (1st run ■, 2nd run , and 3rd run □), the H⁺ production efficiency after 4 hours of illumination is also shown (1st run , 2nd run , and 3rd run ) in set A, with chloride ion addition before the third run (set B), and with intermittent washing between runs (set C). The photocatalyst loading was 0.5 g/L and the light intensity 𝐼≈3.39×10⁻²Einstein L⁻¹h⁻¹.