Adsorptivity of polyvinylpolypyrrolidone (PVPP), a candidate resin with selectivity to U(VI) in HNO3 media, to various metal ions was examined. It was found that PVPP has a strong adsorptivity to U(VI) in wide concentration
range of HNO3. The Scatchard plot analysis revealed that the adsorption of U(VI) by PVPP occurs at plural binding sites. The infrared spectroscopic
analysis suggested that the strong binding site is due to the coordination of the carbonyl oxygen atom and the nitrogen atom
in the pyrrolidone ring to UO22+. It was also found that fission product ions except Re(VII) as the simulant of Tc(VII) and Pd(II) are not adsorbed onto PVPP.
The adsorptivities to Tc(VII) and Pd(II) species are weak, indicating that U(VI) can be separated from other metal ions by