Fig. 1. (a,b) The photos of ag-ZIF-62(Co). (c) The PXRD patterns of pure ZIF-62(Co) crystals and ag-ZIF-62(Co). The XPS high resolution spectra of C 1s (d) and N 1s (e). (f) FTIR spectra of ZIF-62(Co) crystal and ag-ZIF-62(Co). (g) High-resolution FTIR spectra from 500 to 400 cm-1 of ZIF-62(Co) crystal and ag-ZIF-62(Co).

Fig. 2. (a) SMX degradation efficiencies over different conditions. The k values over different concentrations of PMS (b) and different catalyst dosages (c). (d) The SMX degradation efficiencies influenced by initial pH. Reaction conditions: PMS (0.2 mmol/L), H2O2 (3.0 mmol/L), PDS (1.0 mmol/L), SMX (5.0 mg/L), catalyst (0.1 g/L).

Fig. 3. The SMX degradation efficiencies influenced by different concentrations of SO42-; NO3-; H2PO4-; HCO3- (a) and Cl- (b). (c) HClO quench experiment in ag-ZIF-62(Co)/PMS/Cl- system. (d) The SMX degradation efficiencies in different water solutions. Reaction condition: PMS (0.2 mmol/L), SMX (5.0 mg/L), catalyst (0.1 g/L).

Fig. 4. (a) LSV curves obtained under different conditions. (b) Effects of different scavengers on SMX k values over ag-ZIF-62(Co). (c) ESR spectra of DMPO-SO4?-, DMPO-·OH and TEMP-1O2 over ag-ZIF-62(Co) with/without PMS. (d) PMS residual within 30 min during SMX degradation and (inside) standard curve of PMS. (e) SO4?- quantification in mole ratio of PMS and HBA 1:9 and 1O2 quantification. (f) XPS survey spectra of high-resolution spectra of Co 2p.

Fig. 5. The reusability of ag-ZIF-62(Co) (a) and relevant Co ion leaching (b). (c) Photo image of the fixed-bed reactor for SMX degradation over ag-ZIF-62 via. PMS activation. (d) Schematic illustration of the fixed-bed reactor. (e) The degradation of SMX in fixed-bed reactor. (f) COD residual of SMX (5 mg/L, purified water) in fixed-bed reactor.