Formation of morphologically confined nanospaces via self-assembly of graphene and nanospheres for selective separation of lithium

Selective separation of lithium ions is crucial to recycle lithium from saline lakes. Here, a novel multilayer framework membrane was constructed based on graphene oxide and sulfonated amino-polystyrene nanospheres (rGO@SAPS) via amide condensation reaction and self-assembly. With the large specific...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (39), p.18859-18864
Main Authors: Zhao, Yan, Zhou, Chen, Wang, Jiaqian, Liu, Huawen, Xu, Yanqing, Seo, Jin Won, Shen, Jiangnan, Gao, Congjie, Van der Bruggen, Bart
Format: Article
Language:English
Subjects:
Amino groups
Electrodialysis
Graphene
Ions
Lithium
Lithium ions
Magnesium
Membranes
Multilayers
Nanospheres
Parameters
Polystyrene
Polystyrene resins
Saline environments
Salt lakes
Self-assembly
Separation
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Summary:Selective separation of lithium ions is crucial to recycle lithium from saline lakes. Here, a novel multilayer framework membrane was constructed based on graphene oxide and sulfonated amino-polystyrene nanospheres (rGO@SAPS) via amide condensation reaction and self-assembly. With the large specific surface area of these nanospheres and the anchored multitudinous sulfonate groups and amino groups, the synthesized rGO@SAPS formed unique membranes with morphologically confined nanospaces, and are applicable for the selective separation of Li + under an electric field. It was estimated that in an electrodialysis system (solution velocity 250 mL min −1 , current density 12.73 mA cm −2 and membrane thickness 10 μm), the selective separation efficiency parameter (retention or separation parameter between two different ions) of Mg 2+ /Li + and K + /Li + of rGO@SAPS-2 in 20 min is 46.13% and 9.90%, respectively.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA06945J