Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 39, Pages 18859-18864Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta06945j
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Funding
- China Scholarship Council (CSC) of the Ministry of Education, P. R. China [201708330281]
- Science Technology Department of Zhejiang Province [2018C26004]
- Belgian Hercules Foundation [AKUL/13/19]
- Flemish FWO [G0B8915N]
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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 mu m), the selective separation efficiency parameter (retention or separation parameter between two different ions) of Mg2+/Li+ and K+/Li+ of rGO@SAPS-2 in 20 min is 46.13% and 9.90%, respectively.
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