New Porphyrin/Fe-Loaded TiO₂ Composites as Heterogeneous Photo-Fenton Catalysts for the Efficient Degradation of 4-Nitrophenol

Figure 6

Modified Kubelka-Munk function versus energy of absorbed light of the bare TiO₂ (blue line), Fe-TiO₂ (brown line), and CuPp-Fe-TiO₂ (green line).