Fig. 3. XRD patterns (a) and N2 adsorption–desorption isotherms (b) of the unmodified HKUST-1 and the corresponding modified samples. The surface areas of samples are: as-synthesized HKUST-1 (black, 1843 m2 g–1), HKUST-1@PDA-SF (pink, 1286 m2 g–1), HKUST-1@PDA-SF after 6 days in 100 °C water (orange, 1211 m2 g–1), HKUST-1@PDA-SF after 7 days in water (green, 1153 m2 g–1), HKUST-1@PDA-SF after 30 days in water (cyan, 1186 m2 g–1), HKUST-1@PDA-SF after water adsorption 2 runs (red, 1093 m2 g–1) and HKUST-1 after 1 day in water (purple, 255 m2 g–1).
