State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, 116023, China.
University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2017 Aug 7;56(33):9757-9761. doi: 10.1002/anie.201703959. Epub 2017 Jul 17.
Metal-organic framework (MOF) nanosheets could serve as ideal building blocks of molecular sieve membranes owing to their structural diversity and minimized mass-transfer barrier. To date, discovery of appropriate MOF nanosheets and facile fabrication of high performance MOF nanosheet-based membranes remain as great challenges. A modified soft-physical exfoliation method was used to disintegrate a lamellar amphiprotic MOF into nanosheets with a high aspect ratio. Consequently sub-10 nm-thick ultrathin membranes were successfully prepared, and these demonstrated a remarkable H /CO separation performance, with a separation factor of up to 166 and H permeance of up to 8×10 mol m s Pa at elevated testing temperatures owing to a well-defined size-exclusion effect. This nanosheet-based membrane holds great promise as the next generation of ultrapermeable gas separation membrane.
金属-有机骨架（MOF）纳米片由于其结构多样性和最小化的传质障碍，可用作分子筛膜的理想构建块。迄今为止，发现合适的 MOF 纳米片和制备高性能的基于 MOF 纳米片的膜仍然是巨大的挑战。本文使用改良的软物理剥离方法将层状两性 MOF 解离成具有高纵横比的纳米片。因此成功制备了亚 10nm 厚的超薄膜，由于具有良好的尺寸排阻效应，在升高的测试温度下，这些膜表现出显著的 H/CO 分离性能，分离因子高达 166，H 渗透系数高达 8×10 mol m s Pa。这种基于纳米片的膜有望成为下一代超高渗透性气体分离膜。
