Determination of chemical affinity of graphene oxide nanosheets with radionuclides investigated by macroscopic, spectroscopic and modeling techniques.

摘要: The chemical affinity of graphene oxide (GO) nanosheets with radionuclides (Eu(III) and U(VI)) was determined by macroscopic, spectroscopic modeling techniques. macroscopic results showed that the adsorption Eu(III) U(VI) on GO independent ionic strength, indicating inner-sphere surface complexation predominated their adsorption. maximum capacities calculated from a Langmuir model at pH 4.0 T = 303 K were 208.33 mg 28.70 per gram nanosheets, respectively. No hysteresis observed for both when desorption initiated lowering solution pH. While induced replacing radionuclide supernatant liquid radionuclide-free electrolyte solution, adsorption–desorption but not Eu(III), stronger than Eu(III). behaviors can be fitted double diffuse layer mononuclear monodentate >SOM(n−1)+ >SOMOH(n−2)+ complexes, larger log values as compared to those According analysis, irreversible variable concentrations attributed oxygen-containing functional groups.