In the Absorbance vs. Energy plot, the x-axis represents the energy of the incident light, while the y-axis indicates the absorbance of the photocatalysts. The resulting curves illustrate the absorption characteristics of each material, highlighting the wavelengths at which they exhibit significant light absorption. Notably, the shift in the absorption edge towards lower energy values for the doped photocatalysts indicates enhanced light absorption in the visible spectrum, which is crucial for photocatalytic applications under solar irradiation.