Electrostatic‐Induced Crystal‐Rearrangement of Porous Organic Cage Membrane for CO2 Capture

Porous Organic Cages (POCs) with tunable tailoring chemistry properties and polymer‐like processing conditions are of great potential for molecular selective membranes, but it remains challenging in the assembly of high crystalline POCs with regular nanochannels for effective molecular sieving. Here...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-08, Vol.61 (31), p.e202205481-n/a
Main Authors: Qu, Kai, Xu, Jipeng, Dai, Liheng, Wang, Yixing, Cao, Hongyan, Zhang, Dezhu, Wu, Yulin, Xu, Weiyi, Huang, Kang, Lian, Cheng, Guo, Xuhong, Jin, Wanqin, Xu, Zhi
Format: Article
Language:English
Subjects:
Cage molecules
Carbon dioxide
Carbon sequestration
CO2 Capture
Crystal defects
Crystal structure
Crystal-Rearrangement
Electrostatic-Induced Rearrangement
Heterostructures
Ionic liquids
Membranes
Nanochannels
Polymers
Porous Organic Cage
Selectivity
Separation
Strategy
Thermal shock
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Porous Organic Cages (POCs) with tunable tailoring chemistry properties and polymer‐like processing conditions are of great potential for molecular selective membranes, but it remains challenging in the assembly of high crystalline POCs with regular nanochannels for effective molecular sieving. Here we report an electrostatic‐induced crystal‐rearrangement strategy for the design of a POC membrane with heterostructure. Due to electrostatic attraction, ionic liquid molecules induced cage molecules to rearrange into a sub‐10 nm uniform and defect‐free crystal layer, which displayed competitive CO2 separation performance. The optimized hetero‐structured membrane exhibited an attractive CO2/N2 separation selectivity of over 130, which was superior to the state‐of‐the‐art membranes, accompanied with excellent long‐term and thermal shock stability. This strategy provides a new inspiration for the preparation of crystal‐rearranged membranes with regular channels for gas molecule sieving. Competitive CO2 capture in a porous organic cage membrane can be assisted by ionic liquid molecules (e.g., BMIMBF4). Ionic liquid molecules electrostatically induce the crystal‐rearrangement of cage molecules to construct regular nanochannels as well as aiding in situ nanochannel regulation.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202205481