A novel integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide (KCuFC/SPSG) was used for selectively extracting rubidium ion (Rb

+

) from brine. To form KCuFC/SPSG

the precursor film of sulfonated polysulfone/graphene (SPSG) was synthesized by phase conversion process

which was alternately immersed in 0.1 mol·L

-1

CuSO

4

/K

4

[Fe(CN)

6

]

by

in-situ

adsorption coupled co-precipitation method. Various data such as nuclear magnetic resonance spectrometer

Fourier transform infrared spectroscope

X-ray photoelectron spectroscope

X-ray diffraction

scanning electron microscope

and energy dispersive spectroscopy all verified that abundant KCuFC were uniformly located on the film. The resulting KCuFC/SPSG was used in film separation system. As the solution was fed into the system

the Rb

+

could be selectively adsorption by KCuFC/SPSG. After the saturation adsorption

0.5 mol·L

-1

NH

4

Cl/HCl was fed into the film cell

Rb

+

could be quickly desorbed by ion-exchange between Rb

+

and NH

4

+

in the lattice of KCuFC. The purpose of separating and recovering Rb

+

from the brine can be achieved after the repeated operation. The effects of pH

adsorption time

and interferential ions on the adsorption capacity of Rb

+

were investigated by batch experiments. The adsorption behavior fits the pseudo-second order

kinetic process

while KCuFC has a higher adsorption capacity (Langmuir maximum sorption 165.4 mg·g

-1

). In addition

KCuFC/SPSG shows excellent selectivity for Rb

+

even in complex brine systems. KCuFC/SPSG could maintain 93.5% extraction efficiency after five adsorption/desorption cycles.