Please use this identifier to cite or link to this item: https://doi.org/10.1021/jacs.9b13825
Title: Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation
Authors: YING YUNPAN 
Tong, Minman
NING SHOUCONG 
SAI KISHORE RAVI 
PEH SHING BO 
TAN SWEE CHING 
Pennycook,Stephen John 
Zhao Dan 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
GRAPHENE OXIDE MEMBRANES
MOF MEMBRANES
FRAMEWORK NANOSHEETS
COMPOSITE MEMBRANES
CO2 CAPTURE
PERMEATION
TRANSPORT
Issue Date: 4-Mar-2020
Publisher: AMER CHEMICAL SOC
Citation: YING YUNPAN, Tong, Minman, NING SHOUCONG, SAI KISHORE RAVI, PEH SHING BO, TAN SWEE CHING, Pennycook,Stephen John, Zhao Dan (2020-03-04). Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 142 (9) : 4472-4480. ScholarBank@NUS Repository. https://doi.org/10.1021/jacs.9b13825
Abstract: © 2020 American Chemical Society. Covalent organic frameworks (COFs) are a promising category of porous materials possessing extensive chemical tunability, high porosity, ordered arrangements at a molecular level, and considerable chemical stability. Despite these advantages, the application of COFs as membrane materials for gas separation is limited by their relatively large pore apertures (typically >0.5 nm), which exceed the sieving requirements for most gases whose kinetic diameters are less than 0.4 nm. Herein, we report the fabrication of ultrathin two-dimensional (2D) membranes through layer-by-layer (LbL) assembly of two kinds of ionic covalent organic nanosheets (iCONs) with different pore sizes and opposite charges. Because of the staggered packing of iCONs with strong electrostatic interactions, the resultant membranes exhibit features of reduced aperture size, optimized stacking pattern, and compact dense structure without sacrificing thickness control, which are suitable for molecular sieving gas separation. One of the hybrid membranes, TpEBr@TpPa-SO3Na with a thickness of 41 nm, shows a H2 permeance of 2566 gas permeation units (GPUs) and a H2/CO2 separation factor of 22.6 at 423 K, surpassing the recent Robeson upper bound along with long-term hydrothermal stability. This strategy provides not only a high-performance H2 separation membrane candidate but also an inspiration for pore engineering of COF or 2D porous polymer membranes.
Source Title: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
URI: https://scholarbank.nus.edu.sg/handle/10635/169609
ISSN: 0002-7863
1520-5126
DOI: 10.1021/jacs.9b13825
Appears in Collections:Staff Publications
Elements

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Zhao_2019_JACS_iCON membrane_manuscript.docxSubmitted version10.81 MBMicrosoft Word XML

OPEN

Post-print Available on 14-02-2021

SCOPUSTM   
Citations

14
checked on Oct 26, 2020

Page view(s)

45
checked on Oct 30, 2020

Download(s)

3
checked on Oct 30, 2020

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.