Construction of Nano-Cu2O/Cu-Schungite and Its Removal of Uranyl Ions
The efficient and rapid removal of radioactive isotopes is one of the key technical issues that urgently need to be addressed in the field of nuclear medicine.Using uranium(VI)as a representative radionuclide and ShC as precursor to synthesize nano-ShC-Cu2O/Cu composites adsorbent via hydrothermal method.The microstructure and morphology of ShC and ShC-Cu2O/Cu were characterized by SEM,TEM,XRD,FTIR,and BET.Furthermore,the influence of adsorbent dosage,pH value,and adsorption time on the efficiency of UO22+adsorption were systematically investigated.Subsequently,the removal mechanism was elucidated by analyzing thermodynamic,kinetic and XPS.It was demonstrated that the adsorption process followed quasi-second-order kinetics model as well as Langmuir isotherm model.The maximum removal efficiency achieved 91%within 40 minutes,as well as a maximum adsorption capacity reaching 35.44 mg/g.The mechanism indicated the high capacity was attributed to the synergistic effect between redox reaction between Cu2O/Cu and UO22+along with absorption properties offered by ShC.
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