Green aqueous synthesis of microalgae-templated PDA/ZIF-8 core–shell adsorbents for efficient and selective uranium recovery
摘要
To address the challenges posed by uranium scarcity and pollution control, a novel polydopamine (PDA)/ZIF-8 core–shell adsorbent was developed through a green, straightforward, and rapid one-pot synthesis method. This approach involved leveraging the dual functionalities of PDA, serving as a universal adhesion layer and a site for metal nucleation, to uniformly coat PDA in an aqueous medium and facilitate the in-situ growth of ZIF-8. This technique overcomes the inherent difficulties associated with conventional MOF synthesis, which typically rely on organic solvents and exhibit weak interfacial adhesion. The resulting composite demonstrates exceptional structural integrity, with a capacity retention exceeding 80% over six cycles, and displays promising uranium adsorption capabilities. Specifically, the composite achieves a maximum adsorption capacity of 396.82 mg·g−1 at pH=5.2 and exhibits a high selectivity for UO