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

作者：Yi Guo, Yulong Ying, Yiyin Mao, Xinsheng Peng, Banglin Chen · 发表于：Angewandte Chemie · 年份：2016 · DOI：10.1002/ange.201607329 · 被引用次数：158 · 研究领域：Chemical Synthesis and Characterization、Metal-Organic Frameworks: Synthesis and Applications、Extraction and Separation Processes

Abstract 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 5.53×10−4 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.