Abstract
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 CuSO4/K4[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 NH4Cl/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 sys-tems.KCuFC/SPSG could maintain 93.5％extraction efficiency after five adsorption/desorption cycles.
基金项目
Ministry of Science and Technology of China(Science and Technology to Boost Economy 2020 Key Project)(SQ2020YFF0412719)
Ministry of Science and Technology of China(Science and Technology to Boost Economy 2020 Key Project)(SQ2020YFF0404901)
Key Research and Development and Transformation Program Funding in Qinghai Province(2021-GX-105)
Major projects of Anhui Province and Anhui Province Key Research and Development Plan(202104e11020005)
NETL
NSTL
万方数据