期刊
NUCLEAR SCIENCE AND TECHNIQUES
卷 30, 期 2, 页码 -出版社
SPRINGER SINGAPORE PTE LTD
DOI: 10.1007/s41365-019-0543-0
关键词
Amidoxime groups; Pre-irradiation; PE-coated PP skin-core fiber; Adsorption; Uranium
资金
- National Natural Science Foundation of China [U1732151, 21676291]
- Strategic Pilot and Technology Special Funds of the Chinese Academy of Science [XDA02030200]
A novel amidoxime-based fibrous adsorbent, denoted as PE/PP-g-(PAAc-co-PAO), was prepared by pre-irradiation grafting of acrylic acid and acrylonitrile onto polyethylene-coated polypropylene skin-core (PE/PP) fibers using Co-60 gamma-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 mu g/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 mu g/L. The effect of the pH value on the adsorption capacity was also studied. At a very low initial concentration 10 mu g/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.
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