Sorption Behavior of some Lanthanides on Graphene Oxide- Manganese dioxide Composite

In this study, Manganese dioxide decorated graphene oxide (GO-MnO 2 composite) was prepared via fixation of MnO 2 on the surface of graphene oxide (GO) and used as an adsorbent for separation of europium and cerium ions from aqueous solutions. GO, MnO 2 and GO-MnO 2 composite were characterized using scanning electron microscope (SEM), Thermal analysis (TGA), X-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared spectrum (FT-IR). The role of different variable as: contact time, solution pH, metal ion concentration, adsorbent dosage, ionic strength and temperature on sorption efficiency was studied using batch technique. It was found that sorption of Eu(III) and Ce(III) ions on synthesized adsorbents could be described more favorably by pseudo-second-order kinetic model. Sorption data have been interpreted in terms of both Freundlich and Langmuir isotherms. Desorption of Eu(III) and Ce(III) ions from loaded samples was studied using different eluents. The data suggest the possible use of synthesized sorbents for separation of these lanthanides from their aqueous solutions.