Sorption of neptunium in the highest oxidation states from alkaline solutions with complexing fibrous “filled” sorbents

Sorption of Np(VII), Np(VI), and Np(V) from 1 M NaOH by complexing fibrous “filled” sorbents was examined. POLIORGS 33-n and 34-n sorbents containing amidoxime and hydrazidine groups efficiently recover Np in the highest oxidation states and exhibit good kinetic properties. During sorption, Np(VII) is reduced with the sorbent to Np(VI) having a higher, under the actual conditions, distribution coefficient. The distribution coefficients, ml g^?1, were estimated at 4.6 × 10³ for Np(VII), 1.4 × 10⁴ for Np(VI), and 3.6 × 10² for Np(V).