Green Synthesis of Nanostructure CeO₂ Using Tea Extract: Characterization and Adsorption of Dye from Aqueous Phase

Figure 3

SEM images of synthesized CeO₂ samples under different heat treatments (a) 723 K, (b) 923 K, and (c) 1073 K, and TEM images of synthesized CeO₂ at 1073 K (d-f).