期刊
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
卷 314, 期 2, 页码 1393-1404出版社
SPRINGER
DOI: 10.1007/s10967-017-5467-8
关键词
Distribution coefficient; Isotherm; Kinetics; MWCNT-DHA; Neptunium; Sorption
Solid-phase extraction of neptunium in pentavalent and hexavalent oxidation states from the acidic aqueous medium was investigated. The extraction of neptunium, carried out using N,N-dihexylamide functionalized multiwalled carbon nanotubes (MWCNT-DHA) showed high K (d) values. The sorption was found to follow Freundlich isotherm via chemical interaction between the amide functionality and neptunium. The time-dependent sorption study showed that the kinetics followed pseudo second order rate constants. MWCNT-DHA was found radiolytically stable up to 1000 kGy. The selectivity of MWCNT-DHA for the sorption of Np ion was found to be satisfactory. Citric acid was evaluated as the best strippants.
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