“…The coexistence of elements C, N, O, and Fe can be found in the XPS survey scan of NH 2 -MIL88B/TpPa-1-COF (40), suggesting the successful hybridization of NH 2 -MIL88B and TpPa-1-COF (Figure a). As can be seen in Figure b, the binding energies of 283.9, 286.1, and 288.3 eV for C 1s spectra are ascribed to the C–C, C–N–C, and C–OH (CO) bonds, respectively. , In Figure c, four peaks of the N 1s spectrum are found at 398.7, 399.5, 400.5, 402.4 eV, corresponding to the sp 2 -hybridized nitrogen in aromatic triazine rings (C–NC), primary amine species, Fe–N bond, and −N– + , respectively. ,, The O 1s spectrum (Figure d) can be resolved into three peaks with the binding energies of 530.6, 532.1, and 533.35 eV, which are ascribed to Fe–O, CO, and −OH bonds, respectively. ,,, As shown in Figure e, Fe 2p spectrum has three peaks at 711.14, 712.61, and 724.63 eV, respectively. The peaks of 711.14 and 712.61 eV correspond to Fe 2p 3/2 and that of 724.63 eV corresponds to Fe 2p 1/2 , suggesting that Fe 3+ is present in NH 2 -MIL-88B/TpPa-1-COF .…”