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Preparation of amidoxime-functionalized biopolymer/graphene oxide gels and their application in selective adsorption separation of U(VI) from aqueous solution

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Abstract

The amidoxime-functionalized biopolymer/graphene oxide gels were prepared and their performance in the application of the adsorption separation of uranium (VI) in aqueous solution has been studied. The prepared gels were characterized by using scanning electron microscopy, energy dispersive spectroscopy, Fourier transformed infrared spectra, and X-ray diffraction to determine the microscopic morphology, chemical composition and crystal structure. The adsorption performance of the gels including the effects of solution pH and contact time on the adsorption capacity has been evaluated by a batch adsorption technology. The adsorption isotherms and kinetics were measured, and the experimental data were analyzed and shown to be agreed with the Langmuir isotherm and the pseudo-second-order kinetic model. The results demonstrated that the adsorption process was the rate-limiting step in the separation process.

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Abbreviations

c 0 :

U(VI) ion concentration in the initial solution (mg L−1)

c e :

U(VI) ion concentration at equilibrium (mg L−1)

ΔG°:

Change in the Gibbs free energy (J mol−1)

ΔH°:

Change in standard enthalpy (J mol−1)

K 1 :

Rate constant (L min−1)

K 2 :

Rate constant (g mg−1 min−1)

K d :

Distribution constant (mL g−1)

K d,M :

Distribution coefficients of the competing metal ion (L g−1)

K d,U :

Distribution coefficients of U(VI) (L g−1)

K F :

Constants of Freundlich model (mg g−1)

K L :

Constant of Langmuir model (L mg−1)

m :

Weight of adsorbent (g)

n :

Freundlich linearity index

q e :

Amount of U(VI) ions adsorbed at equilibrium (mg g−1)

q m :

Theoretical maximum adsorption capacity per unit weight of the adsorbent (mg g−1)

q t :

Amount of it at time t (mg g−1)

R :

Universal gas constant (8.314 J mol−1 K−1)

ΔS°:

Change in standard entropy (J mol−1 K−1)

\(S_{\text{U/M}}\) :

Distribution selectivity coefficient

T :

Temperature (K)

t :

Time (s)

v :

Volume of the solution (L)

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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) and the item of State Key Laboratory of Nuclear Resources and Environment (NRE 1611).

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Authors and Affiliations

  1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, China

    Shasha Yang, Yiwei Huang, Guolin Huang, Wei Peng & Chenglun Guo

  2. School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, 2006, Australia

    Jeffery Shi

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  1. Shasha Yang
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  2. Yiwei Huang
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  3. Guolin Huang
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  4. Wei Peng
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  5. Chenglun Guo
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Correspondence to Guolin Huang.

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Yang, S., Huang, Y., Huang, G. et al. Preparation of amidoxime-functionalized biopolymer/graphene oxide gels and their application in selective adsorption separation of U(VI) from aqueous solution. J Radioanal Nucl Chem 324, 847–855 (2020). https://doi.org/10.1007/s10967-020-07101-z

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  • DOI: https://doi.org/10.1007/s10967-020-07101-z

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