构建 UiO-66 和 PIM-1 之间的连接路径以提高具有类晶气体选择性的膜 CO 分离性能。

Constructing Connected Paths between UiO-66 and PIM-1 to Improve Membrane CO Separation with Crystal-Like Gas Selectivity.

机构信息

Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.

出版信息

Adv Mater. 2019 Apr;31(15):e1806853. doi: 10.1002/adma.201806853. Epub 2019 Feb 25.

DOI:10.1002/adma.201806853

PMID:30803076

Abstract

Most metal-organic-framework- (MOF-) based hybrid membranes face the challenge of low gas permeability in CO separation. This study presents a new strategy of interweaving UiO-66 and PIM-1 to build freeways in UiO-66-CN@sPIM-1 membranes for fast CO transport. In this strategy, sPIM-1 is rigidified via thermal treatment to make polymer voids permanent, and concurrently polymer chains are mutually linked onto UiO-66-CN crystals to minimize interfacial defects. The pore chemistry of UiO-66-CN is kept intact in hybrid membranes, allowing full utilization of MOF pores and selective adsorption for CO . Separation results show that UiO-66-CN@sPIM-1 membranes possess exceptionally high CO permeability (15433.4-22665 Barrer), approaching to that of UiO-66-NH crystal (65-75% of crystal-derived permeability). Additionally, the CO /N permeation selectivity for a representative membrane (23.9-28.6) moves toward that of single crystal (24.6-29.6). The unique structure and superior CO /N separation performance make UiO-66-CN@sPIM-1 membranes promising in practical CO separations.

摘要

大多数基于金属-有机骨架（MOF）的混合膜在 CO 分离中面临气体渗透率低的挑战。本研究提出了一种将 UiO-66 和 PIM-1 交织在一起的新策略，在 UiO-66-CN@sPIM-1 膜中构建快速 CO 传输的高速公路。在该策略中，sPIM-1 通过热处理被刚性化，以使聚合物空隙永久化，同时聚合物链相互连接到 UiO-66-CN 晶体上，以最小化界面缺陷。混合膜中保持了 UiO-66-CN 的孔化学性质完整，允许充分利用 MOF 孔并对 CO 进行选择性吸附。分离结果表明，UiO-66-CN@sPIM-1 膜具有异常高的 CO 渗透性（15433.4-22665 Barrer），接近 UiO-66-NH 晶体的渗透性（晶体衍生渗透性的 65-75%）。此外，代表性膜的 CO/N 渗透选择性（23.9-28.6）向单晶的 CO/N 渗透选择性（24.6-29.6）靠拢。独特的结构和优异的 CO/N 分离性能使 UiO-66-CN@sPIM-1 膜在实际 CO 分离中具有广阔的应用前景。