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Optimizing zirconium metal-organic frameworks through steric tuning for efficient removal of Cr2O72.

A ligand with a flexible conformation can be obtained by modifying functional groups. We modified H4DCBA with -CH3/-CF3 groups to construct three Zr-MOFs; the torsion of the central benzene ring changes the topologies. The three Zr-MOFs showed high adsorption rates for Cr2O72-, and the CF3-functional groups enhanced the adsorption capacity of UPC-49 for Cr2O72-.