Cu‐BTC Metal–Organic Framework@Ti ₃ C ₂ T _<i>x</i> MXene for Radioactive Uranium Sequestration in an Aqueous Solution

Radioactive uranium is an essential element for nuclear power production, yet the discharge of untreated uranium‐containing wastewater presents a significant environmental challenge. In this study, a Cu‐BTC metal–organic framework (MOF) decorated Ti 3 C 2 T x MXene (Cu‐BTC@MXene) was synthesized via a one‐step co‐precipitation method for uranium removal from aqueous solutions. The combination of Cu‐BTC and Ti 3 C 2 T x MXene demonstrated improved uranium adsorption capacity compared to pristine Ti 3 C 2 T x MXene and Cu‐BTC alone, owing to an increased specific surface area (1494.1 m 2 g −1 ) and the introduction of various functional groups. The Cu‐BTC@MXene achieved complete uranium removal within 60 min, exhibiting a significantly higher uranium removal efficiency than previously reported MXene‐based adsorbents. Fourier transform infrared spectroscopy (FTIR) and X‐ray photoelectron spectroscopy (XPS) analyses revealed that the superior adsorption performance of Cu‐BTC@MXene was primarily attributed to electrostatic attraction, the complexation of −COOH groups and Ti sites, ion exchange between copper and uranium, and cation–π interactions. The adsorption behavior conformed to pseudo‐second‐order kinetics and the Freundlich isotherm model, indicating that chemisorption is the dominant mechanism in uranium adsorption by Cu‐BTC@MXene. Additionally, Cu‐BTC@MXene maintained high uranium adsorption efficiency in the presence of various ions and across different water resources. These findings highlight the potential of the synthesized Cu‐BTC@MXene as a promising adsorbent for the treatment of uranium‐containing wastewater.