Bimetallic Coordination in Two-Dimensional Metal–Organic Framework Nanosheets Enables Highly Efficient Removal of Heavy Metal Lead (II)

Two-dimensional (2D) metal–organic frameworks (MOFs) have emerged as intriguing 2D materials because of their specific features morphology and designable skeletons, which elicited great interest in environment remediation. In this work, MOF nanosheets are fabricated via a mixed-solvent solvothermal method, regulation strategy metal inorganic clusters on MOFs is used to construct two different with monometallic bimetallic coordination, that is, Ni-MOF Ni/Cd-MOF. Binary coordination renders more crystal defects vacancies the framework; thus, compared Ni-MOF, Ni/Cd-MOF exhibits fewer layers (4∼5 layers), higher surface area, larger pore size, electronegativity, leads its excellent adsorption removal for Pb 2+ , rate affinity, superior capacity (950.61 mg/g, almost twice high Ni-MOF). Besides, mechanism further confirmed carboxyl groups (−COO−) from organic linker serve main binding sites has active −COO− capture. Thus, regulated by heterogeneous atoms shows promising application highly efficient heavy ions.