Increasing anthropogenic activities have adversely affected freshwater supply, making it an important global issue. Water resources are often contaminated by industrial dyes, which may harm both environment and human health even at low-level exposure. Herein, we report the adsorptive removal of a representative azo dye, methyl orange (MO) on PCN-224, a Zr porphyrinic metal−organic framework (MOF). Nanoporous PCN-224 has desirable structural characteristics such as an optimal pore aperture and a large pore volume optimized for trapping MO molecules, in addition to superior water stability. Significantly, through the combined investigation of experimental and theoretical studies, multiple adsorption sites such as the porphyrin linkers and Zr 6 nodes of the framework formed π−π interactions and hydrogen bonding with MO molecules, respectively, affording the highest adsorption capacity among the reported MOFs.
Quinolone-based antibiotics commonly
detected in surface, ground,
and drinking water are difficult to remove and therefore pose a threat
as organic contaminants of aqueous environment. We performed adsorptive
removal of quinolone antibiotics, nalidixic acid and ofloxacin, using
a zirconium–porphyrin-based metal–organic framework
(MOF), PCN-224. PCN-224 exhibits the highest adsorption capacities
for both nalidixic acid and ofloxacin among those reported for MOFs
to date. The accessible metal sites of Zr metal nodes are responsible
for efficient adsorptive removal. This study offers a pragmatic approach
to design MOFs optimized for adsorptive removal of antibiotics.
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