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

作者：Zhao, Yan; Zhou, Chen; Wang, Jiaqian; Liu, Huawen; Xu, Yanqing; Seo, Jin Won; Shen, Jiangnan^*; Gao, Congjie; Van der Bruggen, Bart^*

来源：Journal of Materials Chemistry A, 2018, 6(39): 18859-18864.

DOI：10.1039/c8ta06945j

• ANION-EXCHANGE MEMBRANE
• ENHANCED MONOVALENT SELECTIVITY
• SINGLE-LAYER GRAPHENE
• ION BATTERIES
• ANTIFOULING PROPERTIES
• OXIDE MEMBRANES
• ELECTRODIALYSIS
• PERFORMANCE
• TRANSPORT
• FILMS

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.

• 出版日期2018-10-21
• 单位浙江工业大学