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Article Abstract
Improving the water stability of metal-organic frameworks (MOFs) is essential for their use in water pollution treatment and environmental remediation, though it remains technically challenging. Herein, we report a novel cationic MOF constructed with [ThO(OH)(COO)] units and [CoN·Cl] units possessing a ftw-type topology (denoted as ). itself exhibited poor water stability but excellent stability following a palladium(II) modulation strategy. Experimental studies reveal that Co(II) ions in were replaced by Pd(II) ions through cation exchange in N,N-diethylformamide (yielding ). The planar PdN units in were responsible for improving the water stability of the framework. As a result, offered excellent stability, fast adsorption kinetics, and high removal ratios for TcO and ReO (as a TcO surrogate) in contaminated water. When used in packed columns, can dynamically capture ReO from groundwater. This work provides a new avenue for improving the water stability of MOFs, offering new vistas for the decontamination of aqueous solutions containing TcO and ReO.
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