The fabrication of 3D hierarchical flower-like δ-MnO2@COF nanocomposites for the efficient and ultra-fast removal of UO22+ ions from aqueous solution

3D flower-like δ-MnO₂@TpPa-1 composites was constructed though the integration of δ-MnO₂ nano-flowers with a covalent organic framework (TpPa-1) via ultrasonication process. δ-MnO₂@TpPa-1 a promising adsorbent for spent-nuclear-fuel reprocessing.