Abstract
Eco-friendly and low-cost composite, amidoxime-functionalized microcrystalline cellulose/mesoporous silica (MCC/MS-AO), were synthesized by co-condensation method. The obtained materials were characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and N2 adsorption–desorption analysis. Batch experiments were carried out to study the adsorption capacity of U(VI) on MCC/MS-AO. The results show that the material has good adsorption capabilities for U(VI) including high capacity, good selectivity, and reusability. The adsorption process conforms to pseudo-second-order kinetic model and Langmuir model, and it is spontaneous and endothermic. Finally, the possible adsorption mechanism was further studied by X-ray photoelectron spectroscopy (XPS) techniques.
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Abbreviations
- C 0 :
-
Initial concentration of U(VI) in the solution, mg L−1
- C e :
-
Concentration of U(VI) in the solution after adsorption, mg L−1
- ΔG 0 :
-
Standard Gibbs free energy, kJ mol−1
- ΔH 0 :
-
Standard enthalpy, kJ mol−1
- K 1 :
-
Adsorption rate constants for pseudo-first-order kinetic model, min−1
- K 2 :
-
Adsorption rate constants for pseudo-second-order kinetic model, min−1
- K d :
-
Distribution constant, mL g−1
- K F :
-
Freundlich constant, which is related to adsorption capacity and adsorption strength, mg1−n Ln g−1
- K L :
-
Langmuir constant, which is related to the affinity of the binding site and the free energy of adsorption, L mg−1
- m:
-
Quantity of adsorbent, mg
- n :
-
Freundlich linearity index
- q e :
-
Adsorption capacity at equilibrium state, mg g−1
- q m :
-
Maximum adsorption capacity, mg g−1
- q t :
-
Adsorption capacity at any time, mg g−1
- R :
-
Thermodynamic constant, 8.314 J mol−1 K−1
- R L :
-
Separation factor
- ΔS 0 :
-
Standard entropy, J mol−1 K−1
- S U/M :
-
Selectivity coefficient
- t :
-
Adsorption time, min
- T :
-
Temperature, K
- V :
-
Volume of U(VI) containing solution, mL
- η :
-
Adsorption efficiency
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Acknowledgements
The present work was partially supported by the national science foundation of China (21866005), Jiangxi Key plan of research and development (20192BBH80011).
Funding
Innovative Research Group Project of the National Natural Science Foundation of China,21866005,wenbin Liu
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Liu, W., Huang, Y., Huang, G. et al. Eco-friendly and low-cost amidoxime-functionalized microcrystalline cellulose/mesoporous silica composite for the selective adsorption of U(VI) from aqueous solution. J Radioanal Nucl Chem 331, 2055–2068 (2022). https://doi.org/10.1007/s10967-022-08261-w
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DOI: https://doi.org/10.1007/s10967-022-08261-w