Amorphization Strategy for Constructing Metal‐Triazole Framework Glass Foams with Multistage Pore Structure for Selective Removal of Mercury

Abstract Amorphous MOFs have attracted more attentions due to their excellent adsorption performance. However, the transformation of crystalline MOF into amorphous MOF often requires harsh conditions, and simple and scalable amorphization strategies are still lacking. In this work, amorphous MOF via a solvent‐assisted evaporation amorphization strategy is synthesized. The results show that amorphous a gf BNU‐1(Zn) and a gf BNU‐1(Cd) glass foams with short‐range ordered but long‐range disordered atomic structure and foam‐like multistage pore structure display adsorption capacities of up to 1009 and 1127 mg g −1 for Hg 2+ , surpassing those of crystalline cBNU‐1(Zn) and cBNU‐1(Cd) by 1.29 and 5.12 times, reaching a record high. The adsorption kinetics show that the adsorption rate constants of a gf BNU‐1(Zn) and a gf BNU‐1(Cd) are 1.49 and 7.6 times compared with those of the crystalline, and the partition coefficients for Hg 2+ are 2.13 and 373 times those of the crystallines, and the separation factors of Hg 2+ /Ni 2+ attain 1506 and 2012, exhibiting excellent adsorption selectivity. Experiments and DFT calculations show that N and S atoms in a gf BNU‐1(Zn) and a gf BNU‐1(Cd) are involved in the coordination with Hg 2+ . The present work demonstrates the benefits of utilizing amorphous MOFs glass foams for ion adsorption and provided a new strategy for the preparation of high‐performance MOFs‐based adsorbents.