Polystyrene Sulfonate Threaded through a Metal–Organic Framework Membrane for Fast and Selective Lithium‐Ion Separation

Angewandte Chemie - International Edition - Tập 55 Số 48 - Trang 15120-15124 - 2016
Yi Guo1, Yulong Ying1, Yiyin Mao1, Xinsheng Peng1, Banglin Chen2,1
1State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
2Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA

Tóm tắt

AbstractExtraction 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 5.53×10−4 S cm−1 at 25 °C, 1.89×10−3 S cm−1 at 70 °C, and Li+ flux of 6.75 mol m−2 h−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.

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Angewandte Chemie - International Edition

Tập 55 Số 48

15120-15124

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