Designing a Novel MOFs@COF Hybrids for Removal of Pb(II) ions in Aqueous Solution

Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have attracted researchers great attention owing to their outstanding properties, such as large specific surface area, tunable porosity and controllable functions. Herein, two common amine-functionalized MOFs, NH2-MIL-125(Ti) and NH2-UiO-66(Zr), were selected as dopants to prepare binary hybrids of NH2-MIL-125(Ti)@TpPa-1 and NH2-UiO-66(Zr)@TpPa-1 by solvothermal method, respectively, which were acted as a multifunctional platform with adsorption for Pb(II) ions. Furthermore, various characterizations were confirmed that as-prepared MOF/COF hybrids were successfully synthesized via imine bond interconnection. In addition, the resulting hybrids shows significant difference in capability for Pb(II) ions under the same adsorption conditions，which the removal rate of NH2-MIL-125(Ti) and NH2-MIL-125(Ti)@TpPa-1 for Pb2+ ions was obviously better than that of NH2-UiO-66(Zr)and NH2-UiO-66(Zr)@TpPa-1.