Figure 3

Characterization of UiO: (a) FT-IR spectra of UiO-66-(CO₂H)₂ and 1,2,3,4-benzenetetracarboxylic acid; (b) PXRD patterns of the simulated and as-synthesized UiO-66-(CO₂H)₂; (c and d) FE-SEM images of UiO-66-(CO₂H)₂; (e and f) EDX elemental spectrum and mapping images of UiO-66-(CO₂H)₂.