Designing Polyethyleneimine‐Based Electrospun Fibers via Hydrogen Bonding Reconstruction for Enhanced Uranium Extraction From Seawater

in uranium-spiked seawater, surpassing that of bPEI fiber by 2.5 times. The fiber retains over 95% capacity even after 7 cycles, demonstrating excellent reusability. Quantum-theoretical studies reveal that the flexible TEPA can form a synergistic adsorption network with bPEI, which undergoes adaptive adjustment in seawater to capture uranyl, improving both uranium uptake and selectivity. The proposed underlying mechanism of branched-linear intertwining provides a practical approach for designing high-performance uranium adsorbents.