A mesoporous cationic metal-organic framework with a high density of positive charge for enhanced removal of dichromate from water.

An imidazolium-functionalized mesoporous cationic Cr-based metal-organic framework (MOF) with high densities of positive charges was synthesized for the first time via a mixed-solvent strategy. The cationic mesoporous Cr-based MOF showed excellent adsorption performances in the removal of dichromate Cr2O72- from water with a large uptake of 321 mg g-1 and good regeneration ability.