Photoelectrocatalytic Degradation of Humic Acids Using Codoped TiO₂ Film Electrodes under Visible Light

Figure 7

Degradation of humic acid under solar light and dark reaction over all Cu/N codoped TiO₂: (1) 1 : 1-500, (2) 1 : 2-500, (3) 1 : 3-500, (4) 2 : 1-500, (5) 2 : 2-500, (6) 2 : 3-500, (7) 3 : 1-500, (8) 3 : 2-500, and (9) 3 : 3-500.