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Frontiers of Chemical Science and Engineering

Front. Chem. Sci. Eng.    2020, Vol. 14 Issue (6) : 1029-1038
Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions
Xuewen Hu3, Yun Wang1,3(), Jinbo Ou Yang2, Yang Li3, Peng Wu3, Hengju Zhang3, Dingzhong Yuan1,2, Yan Liu1,2, Zhenyu Wu4, Zhirong Liu1
1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2. School of Chemical Biology and Materials Science, East China University of Technology, Nanchang 330013, China
3. School of Nuclear Science and engineering, East China University of Technology, Nanchang 330013, China
4. China Institute of Atomic Energy, Beijing 102413, China
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In this study, a graphene oxide nanoribbons/chitosan (GONRs/CTS) composite membrane was successfully prepared by encapsulating CTS into GONRs, which were unzipped from multi-walled carbon nanotubes. The GONRs/CTS composite membrane so prepared was characterized using scanning electron microscopy, X-Ray diffraction and Fourier transform infrared spectroscopy. The effects of the experimental conditions such as the pH (2‒7), adsorbent dosage (10‒50 mg), experimental time (5 min–32 h), uranium concentration (25‒300 mg∙L−1), experimental temperature (298 K‒328 K) on the adsorption properties of the composite membrane for the removal of U(VI) were investigated. The results showed that the U(VI) adsorption process of the GONRs/CTS composite membrane was pH-dependent, rapid, spontaneous and endothermic. The adsorption process followed the pseudo-secondary kinetics and Langmuir models. The maximum U(VI) adsorption capacity of the GONRs/CTS composite membrane was calculated to be 320 mg∙g−1. Hence, the GONRs/CTS composite membrane prepared in this study was found to be suitable for separating and recovering uranium from wastewater.

Keywords graphene nanoribbons      chitosan      U(VI)      adsorption     
Corresponding Author(s): Yun Wang   
Just Accepted Date: 27 December 2019   Online First Date: 21 February 2020    Issue Date: 11 September 2020
 Cite this article:   
Xuewen Hu,Yun Wang,Jinbo Ou Yang, et al. Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions[J]. Front. Chem. Sci. Eng., 2020, 14(6): 1029-1038.
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Xuewen Hu
Yun Wang
Jinbo Ou Yang
Yang Li
Peng Wu
Hengju Zhang
Dingzhong Yuan
Yan Liu
Zhenyu Wu
Zhirong Liu
Fig.1  GONRs/CTS composite membrane.
Fig.2  SEM image of the (a) GONRs and (b) GONRs/CTS composites.
Fig.3  FT-IR spectra of (a) GONRs, (b) CTS, and (c) GONRs/CTS.
Fig.4  XRD patterns of GONRs and GONRs/CTS.
Fig.5  Effect of pH on the U (VI) adsorption of GONRs/CTS. M = 15 mg, C0 = 50 mg?L?1, T = 298 K, t = 24 h.
Fig.6  Effect of pH on the distribution of uranium(VI) species, as calculated using Medusa program.
Fig.7  The effect of adsorbent dosage on the U (VI) adsorption of GONRs/CTS. C0 = 50 mg?L?1, T = 298 K, pH= 5.0, t = 24 h.
Fig.8  Effect of the adsorption time on the U (VI) adsorption of GONRs/CTS. M = 15 mg, pH= 5.0, C0 = 50 mg?L?1, T = 298 K.
Fig.9  (a) Pseudo-first-order kinetics and (b) pseudo-second-order kinetics models.
qe,exp/(mg?g?1) Pseudo-first-order kinetics Pseudo-second-order kinetics
80 k1/min?1 qe,cal/(mg?g?1) R2 k2/min?1 qe,cal/(mg?g?1) R2
0.002 183.159 0.907 0.0001 105.268 0.992
Tab.1  Kinetic parameters of U(VI) adsorption on GONRs/CTS
Fig.10  Effect of the initial uranium concentration on the U (VI) adsorption of GONRs/CTS. M = 15 mg, pH= 5.0, T = 298 K, t = 24 h.
Fig.11  (a) Langmuir and (b) Freundlich models.
Langmuir model Freundlich model D-R model
qm/(mg?g?1) KL R2 KF n R2 qm /(mg?g?1) β n R2
333.33 0.0599 0.9802 56.56 0.4175 0.9904 199.5371 0.2721 1.355 0.6202
Tab.2  Parameters for the Langmuir and Freundlich isotherm models of U(VI) adsorption on GONRs/CTS
Fig.12  Effect of the adsorption temperature on the U (VI) adsorption of GONRs/CT. M = 15 mg, pH= 5.0, C0 = 50 mg?L?1, t = 24 h.
DH°/(kJ?mol?1) DS°/(J?mol?1?K?1) DG°/(kJ?mol?1)
298 K 308 K 318 K 328 K
43.2 177.20 ?9.61 ?11.38 ?13.15 ?14.92
Tab.3  Thermodynamic parameters for the U (VI) adsorption of GONRs/CTS
Fig.13  Selective adsorption on GONRs/CTS.
Fig.14  Reusability of GONRs/CTS.
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