Polystyrene Sulfonate Threaded through a Metal-Organic Framework Membrane for Fast and Selective Lithium-Ion Separation.
Extraction of lithium ions from salt-lake brines is very important to produce lithium compounds. Herein, we report a new approach to construct polystyrene sulfonate (PSS) threaded HKUST-1 metal-organic framework (MOF) membranes through an in situ confinement conversion process. The resulting membrane PSS@HKUST-1-6.7, with unique anchored three-dimensional sulfonate networks, shows a very high Li+conductivity of 5.53×10-4S cm-1at 25 °C, 1.89×10-3S cm-1at 70 °C, and Li+flux of 6.75 mol m-2h-1, which are five orders higher than that of the pristine HKUST-1 membrane. Attributed to the different size sieving effects and the affinity differences of the Li+, Na+, K+, and Mg2+ions to the sulfonate groups, the PSS@HKUST-1-6.7 membrane exhibits ideal selectivities of 78, 99, and 10296 for Li+/Na+, Li+/K+, Li+/Mg2+and real binary ion selectivities of 35, 67, and 1815, respectively, the highest ever reported among ionic conductors and Li+extraction membranes.
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Yi
Y
Guo
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Yulong
Y
Ying
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Yiyin
Y
Mao
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Xinsheng
X
Peng
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.|Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX, 78249, USA.
Banglin
0000-0001-8707-8115
B
Chen
lithium-ion separation; membranes; metal-organic framework membranes; sulfonate networks; transport properties