Fig. 5. SEM images of ZIF-67 nanocubes (a), hydrophobically modified ZIF-67@PDA-SF (b), and XRD patterns of ZIF-67 and ZIF-67@PDA-SF after exposure to H2SO4 (pH = 3)/NaOH (pH = 13) solution for 24 h (c and d). The insets are the water contact angles (CA) and a photograph of ZIF-67 (a) and ZIF-67@PDA-SF (b), respectively.
