skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Gas Permeation and Separation Characteristics of Microporous TpHz COF Membranes Synthesized by Substrate-Assisted Interfacial Polymerization

Journal Article · · Industrial and Engineering Chemistry Research

Microporous two-dimensional covalent organic framework (2D COF) membranes offer promise for gas separation applications, but their gas transport mechanism remains unclear. In this study, a TpHz 2D COF membrane supported on a macroporous nylon substrate is prepared by substrate-assisted interfacial polymerization under mild conditions. The formation of a continuous and dense thin (~300 nm thick) TpHz layer is confirmed by scanning electron microscopy and Fourier transform infrared spectroscopy. Characterization by X-ray diffraction, grazing incidence wide-angle X-ray scattering, and N2 porosimetry qualitatively reveals the microstructures of the supported TpHz membranes, i.e., they comprise partially oriented 2D COF lamellar crystallites with moderate crystallinity in an eclipsed (AA) stacking geometry, centering the effective membrane pore size distribution at ~1.1 nm. Further, single gas permeation data show that the transport of common molecular gases, including H2, He, CH4, N2, and CO2, through the synthesized TpHz membranes follows the Knudsen transport mechanism, where single gas permeance decreases with an increasing molecular weight and permeation temperature. Binary gas separation results show that in the equimolar CO2/N2 mixture, the presence of the CO2 surface flow slightly hinders the N2 flow at room temperature due to the reduced membrane channel size by the adsorbed CO2 gas layer on TpHz’s pore wall. In contrast, permeation of the equimolar CH4/N2 binary mixture does not exhibit a discernible surface flow of both gases due to their much lower gas uptake on TpHz, and their transport mechanism follows Knudsen-like behavior.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); ACS-Petroleum Research Fund (PRF)
Grant/Contract Number:
89233218CNA000001; CBET-2216843; 65612-DNI5; CBET-2031087
OSTI ID:
2315663
Report Number(s):
LA-UR-23-33431
Journal Information:
Industrial and Engineering Chemistry Research, Vol. 63, Issue 8; ISSN 0888-5885
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (62)

Photo-tailored heterocrystalline covalent organic framework membranes for organics separation journal July 2022
Enabling Solution Processable COFs through Suppression of Precipitation during Solvothermal Synthesis journal November 2022
Gas Separation Membrane Materials: A Perspective journal September 2014
Fabricating compact covalent organic framework membranes with superior performance in dye separation journal November 2021
An azine-linked covalent organic framework ACOF-1 membrane for highly selective CO2/CH4 separation journal January 2018
Covalent Self-Assembly in Two Dimensions: Connecting Covalent Organic Framework Nanospheres into Crystalline and Porous Thin Films journal November 2019
Interfacial polymerization of covalent organic frameworks (COFs) on polymeric substrates for molecular separations journal November 2018
Engineering Covalent Organic Framework Membranes journal July 2021
Secondary growth of covalent organic frameworks (COFs) on porous substrates for fast desalination journal June 2020
Large-Area 2D Covalent Organic Framework Membranes with Tunable Single-Digit Nanopores for Predictable Mass Transport journal February 2022
Aqueous Processable Two‐Dimensional Triazine Polymers with Superior Photocatalytic Properties journal May 2023
Characterization of zirconia modified porous stainless steel supports for Pd membranes journal August 2006
Review on Mechanisms of Gas Permeation through Inorganic Membranes journal January 2011
Ultrathin heterostructured covalent organic framework membranes with interfacial molecular sieving capacity for fast water-selective permeation journal January 2020
Polymeric Gas Separation Membranes journal March 2012
Two-Dimensional Covalent Organic Framework (COF) Membranes Fabricated via the Assembly of Exfoliated COF Nanosheets journal March 2017
Tunable Water and CO 2 Sorption Properties in Isostructural Azine-Based Covalent Organic Frameworks through Polarity Engineering journal November 2015
Laminated self-standing covalent organic framework membrane with uniformly distributed subnanopores for ionic and molecular sieving journal January 2020
PTSA-mediated interfacial catalytic polymerization of crystalline dense covalent organic framework membranes for enhanced desalination journal November 2023
Covalent organic frameworks based membranes for separation of azeotropic solvent mixtures by pervaporation journal July 2023
Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation journal February 2020
Pore-in-Pore Engineering in a Covalent Organic Framework Membrane for Gas Separation journal April 2023
Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications journal January 2016
Unidirectional diffusion synthesis of covalent organic frameworks (COFs) on polymeric substrates for dye separation journal September 2019
Synchronizing formation of polyamide with covalent organic frameworks towards thin film nanocomposite membrane with enhanced nanofiltration performance journal March 2022
Covalent Organic Framework–Covalent Organic Framework Bilayer Membranes for Highly Selective Gas Separation journal July 2018
Diffusion on Surfaces. I. Effect of Concentration on the Diffusivity of Physically Adsorbed Gases journal May 1974
Ultralarge Free‐Standing Imine‐Based Covalent Organic Framework Membranes Fabricated via Compression journal January 2022
Ultrathin Covalent Organic Framework Membranes via a Multi‐Interfacial Engineering Strategy for Gas Separation journal September 2021
Oriented 2D Covalent Organic Framework Thin Films on Single-Layer Graphene journal April 2011
Gas permeation and separation properties of large-sheet stacked graphene oxide membranes journal March 2018
Hybrid systems: Combining membrane and absorption technologies leads to more efficient acid gases (CO 2 and H 2 S) removal from natural gas journal March 2017
Single‐Phase Covalent Organic Framework Staggered Stacking Nanosheet Membrane for CO2‐Selective Separation journal July 2021
The atom, the molecule, and the covalent organic framework journal March 2017
Covalent Organic Framework Membranes for Efficient Chemicals Separation journal August 2021
Diffusion-induced in situ growth of covalent organic frameworks for composite membranes journal January 2019
Crystallinity and Molecular Packing of Small Molecules in Bulk-Heterojunction Organic Solar Cells journal June 2022
An Azine-Linked Covalent Organic Framework: Synthesis, Characterization and Efficient Gas Storage journal July 2015
Graphene oxide membranes with narrow inter-sheet galleries for enhanced hydrogen separation journal January 2019
Free-Standing Nanometer-Thick Covalent Organic Framework Films for Separating CO2 and N2 journal February 2022
Synthesis of ZIF-68 Membrane on a ZnO Modified α-Alumina Support by a Modified Reactive Seeding Method journal March 2016
Crystal Engineering of Covalent Organic Frameworks Based on Hydrazine and Hydroxy-1,3,5-Triformylbenzenes journal August 2018
Improved synthesis of β-ketoenamine-linked covalent organic frameworks via monomer exchange reactions journal January 2019
Gas and surface diffusion in modified γ-alumina systems journal October 1989
Brønsted acid mediated covalent organic framework membranes for efficient molecular separation journal January 2019
Mixed Matrix Membranes (MMMs) Comprising Exfoliated 2D Covalent Organic Frameworks (COFs) for Efficient CO 2 Separation journal February 2016
Solutions Are the Problem: Ordered Two-Dimensional Covalent Organic Framework Films by Chemical Vapor Deposition journal October 2023
Covalent organic frameworks journal January 2012
Orally delivered 2D covalent organic frameworks releasing kynurenine generate anti-inflammatory T cell responses in collagen induced arthritis mouse model journal September 2023
Oil–Water–Oil Triphase Synthesis of Ionic Covalent Organic Framework Nanosheets journal November 2021
Lewis-Acid-Catalyzed Interfacial Polymerization of Covalent Organic Framework Films journal February 2018
Contra-diffusion synthesis of ZIF-8 films on a polymer substrate journal January 2011
Preparation of COF-TpPa1 membranes by chemical vapor deposition method for separation of dyes journal October 2021
Anti-scaling covalent organic framework membranes with custom-tailored nanochannels for efficient lithium extraction journal April 2023
Future Directions of Membrane Gas Separation Technology journal March 2002
Control methane to slow global warming — fast journal August 2021
Moderately Crystalline Azine-Linked Covalent Organic Framework Membrane for Ultrafast Molecular Sieving journal July 2021
Solving the COF trilemma: towards crystalline, stable and functional covalent organic frameworks journal January 2020
Knudsen diffusion in microporous carbon membranes with molecular sieving character journal November 2002
Covalent organic frameworks for separation applications journal January 2020
Cuprous-Chloride-Modified Nanoporous Alumina Membranes for Ethylene−Ethane Separation journal April 1999
Vapor-liquid interfacial polymerization of covalent organic framework membranes for efficient alcohol dehydration journal January 2022