Potassium copper hexacyanoferrate (KCuFC) had higher Rb sorption than other forms.
KCuFC encapsulated with polymer (KCuFC-PAN) was well suited for dynamic column.
KCuFC-PAN in fixed-bed column regenerated well in Rb sorption/desorption cycles.
KCuFC-PAN showed Rb selectivity over a wide concentration of saline brine ions.
Rb was purified from K/Rb mixed solution using an ion exchange resin.