Abstract
Nanostructuring or hydrophilic modification is critical to enhance uranium capture capability of polyamidoxime (PAO)-based adsorbents. Herein, PAO-based composite hydrogels, consisting of nanostructured PAO and interconnected sodium polyacrylate (PAA-Na), are produced via one-pot hydrolysis/amidoximation and self-assembly. The synergism of nanostructured PAO and hydrophilic PAA-Na network significantly promotes uranium capture from aqueous solutions, and a maximum adsorption capacity of 1849 mg-U/g is reached at pH= 7. Meanwhile, the composite hydrogels show a satisfied uranium uptake (21.8 mg-U/g) and a high selectivity in a simulated seawater containing profuse interfering metal ions. This study opens a facile and low-cost way for scalable production of PAO-based composite hydrogels towards high-efficiency uranium recovery in the wastewater and seawater.
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