Fig. 1. SEM images of (A) MOFs (UiO-66), (B) fresh MOFs-NZVI and (C) MOFs-NZVI reacted with As(iii), (D) EDS of main elements in the region of (C) in the red frame and (E) histogram showing the size distribution of NZVI on MOFs-NZVI (mMOFs-NZVI = 0.15 g, mass fraction of NZVI = 16.7%, CAs(iii) = 20 mg L−1, VAs(iii) = 100 mL, pH = 7.0, T = 25 °C).
