A novel amidoxime-based fibrous adsorbent,denoted as PE/PP-g-(PAAc-co-PAO),was prepared by preirradiation grafting of acrylic acid and acrylonitrile onto polyethylene-coated polypropylene skin-core (PE/PP) fibers using 60Co γ-ray irradiation,followed by amidoximation.The original and modified PE/PP fibers were characterized by a series of characterization methods to demonstrate the attachment of amidoxime groups onto the PE/PP fibers.Breaking strength tests confirmed that the fibrous adsorbent could maintain good mechanical properties.The adsorption capacity of the PE/PP-g-(PAAc-co-PAO) fibers was investigated in simulated seawater with an initial uranium concentration of 330 μg/L.The uranium adsorption capacity was 2.27 mg/g-adsorbent after 24 h in simulated seawater,and the equilibrium data were well described by the Freundlich isotherm model.The PE/PP-g-(PAAc-co-PAO) adsorbent exhibited good regeneration and recyclability during five adsorption-desorption cycles.The adsorption test was also performed in simulated radioactive effluents with uranium concentrations of 10 and 100 μg/L.The effect of the pH value on the adsorption capacity was also studied.At a very low initial concentration 10 μg/L solution,the PE/PP-g-(PAAc-co-PAO) fiber could remove as much as 93.0％ of the uranium,and up to 71.2％ of the uranium in the simulated radioactive effluent.These results indicated that the PE/PP-g-(PAAc-co-PAO) adsorbent could be used in radioactive effluents over a wide range of pH values.Therefore,the PE/PP-g-(PAAc-co-PAO) fibers,with their high uranium selectivity,good regeneration and recyclability,good mechanical properties,and low cost,are promising adsorbents for extracting uranium from aqueous solutions.