Considering the difficulty to recover trace uranium in organic phase, Na₂CO₃ aqueous solution was used to strip uranium, then the amidoxime adsorbents were chosen to enrich uranyl in the aqueous phase. In the stripping part, the kinetics of stripping, the effects of the concentration of Na₂CO₃ and phase ratio on the stripping efficiency were investigated. Then, in the adsorption part, the effects of shaking rate, the mass of adsorbents and the concentration of Na₂CO₃ were studied. After the validation of the recyclable performance of the amidoxime adsorbents, a process for recovering trace uranium in organic waste liquid was proposed.

The ionic imprinted polymer (IIP) of uranyl ion (UO₂²⁺) was synthesized by the formation of binary complexes of UO₂²⁺ with 1,3-dioxo-1,3-diphenylpropan-2-yl methacrylate (DBM-MAA) as functional monomer followed by thermal copolymerization with ethylene glycol dimethacrylate (EGDMA) as cross-linking monomer in the presence of 2,2′-azobisisobutyronitrile (AIBN) as initiator and 1,4-dioxane as porogenic solvent. 50 mmol/L HCl solution was used to leach out UO₂²⁺ ions from the polymer. The IIP formed with 1:3 molar ratio of UO₂²⁺ to DBM-MAA showed better enrichment of uranyl ion from dilute aqueous solution than others and hence was chosen for detailed studies. The maximum adsorption capaci(NH₄)₄[UO₂(CO₃)₃]sub>)₃] solution was 9.4 mg U/g. The prepared IIP could selectively separate UO₂²⁺ from other metal ions, such as Li⁺, Na⁺, K⁺ and Rb⁺.