Enhancing Uranium Extraction From Seawater by Co-MOF Micro-Redox Centers Anchored in an N-doped Graphene Aerogel

The sustainable supply of uranium attracts widespread attention in meeting the rising global demand for nuclear energy. Although seawater contains abundant uranium, uranium extraction from seawater is still challenged by the ultra-low uranium concentration and biofouling from marine microorganisms. Herein, a nitrogen-doped graphene oxide aerogel loaded with cobalt-based metal-organic frameworks (Co-MOF/GCN) is fabricated for efficient uranium extraction from seawater. This material exhibits excellent extraction performance and kinetics with a saturated adsorption capacity of 701.90 mg/g and an equilibrium time of 30 min. Furthermore, Co-MOF/GCN demonstrates a remarkable selectivity and antibacterial ability, which enables it to achieve a uranium extraction capacity of 10.05 mg/g from natural seawater in only 1 day. Meanwhile, Co-MOF/GCN is capable of partially reducing U(VI) to U(IV) alongside uranium adsorption, which is energy-efficient without the need for external energy sources such as light or an electric field. This work not only demonstrates the design of a high-performance, multifunctional material for uranium extraction, but also paves the way for its economically viable application in seawater.