Journal ArticleDOI
Covalent Organic Framework–Covalent Organic Framework Bilayer Membranes for Highly Selective Gas Separation
Hongwei Fan,Hongwei Fan,Alexander Mundstock,Armin Feldhoff,Alexander Knebel,Jiahui Gu,Hong Meng,Jürgen Caro +7 more
TLDR
A new type of a two-dimensional layered-stacking COF-COF composite membrane in bilayer geometry synthesized on a porous support by successively regulating the growth of imine-based COf-LZU1 and azine- based ACOF-1 layers via a temperature-swing solvothermal approach is demonstrated.Abstract:
Covalent organic frameworks (COFs) have been proposed as alternative candidates for molecular sieving membranes due to their chemical stability. However, developing COF membranes with narrowed apertures close to the size of common gas molecules is a crucial task for selective gas separation. Herein, we demonstrate a new type of a two-dimensional layered-stacking COF–COF composite membrane in bilayer geometry synthesized on a porous support by successively regulating the growth of imine-based COF-LZU1 and azine-based ACOF-1 layers via a temperature-swing solvothermal approach. The resultant COF-LZU1–ACOF-1 bilayer membrane has much higher separation selectivity for H2/CO2, H2/N2, and H2/CH4 gas mixtures than the individual COF-LZU1 and ACOF-1 membranes due to the formation of interlaced pore networks, and the overall performance surpasses the Robeson upper bounds. The COF-LZU1–ACOF-1 bilayer membrane also shows high thermal and long-time stabilities.read more
Citations
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Journal ArticleDOI
Covalent Organic Frameworks: Design, Synthesis, and Functions.
Keyu Geng,Ting He,Ruoyang Liu,Sasanka Dalapati,Ke Tian Tan,Zhongping Li,Shanshan Tao,Yifan Gong,Qiuhong Jiang,Donglin Jiang +9 more
TL;DR: A comprehensive review of the COF field is targeted, providing a historic overview of the chemistry, the advances in the topology design and synthetic reactions, illustrate the structural features and diversities, and scrutinize the development and potential of various functions through elucidating structure-function correlations.
Journal ArticleDOI
Covalent organic frameworks for separation applications.
TL;DR: This review attempts to highlight the key advancements made in the synthesis of COFs for diverse separation applications such as water treatment or the separation of gas mixtures and organic molecules, including chiral and isomeric compounds.
Journal ArticleDOI
Covalent organic frameworks for membrane separation.
Shushan Yuan,Shushan Yuan,Xin Li,Junyong Zhu,Gang Zhang,Peter Van Puyvelde,Bart Van der Bruggen +6 more
TL;DR: This review analyzes the synthesis and applications of diverse continuous/discontinuous COF membranes, such as COF-based mixed matrix membranes (MMMs), COf-based thin film nanocomposite (TFN) membranes, and free-standing COF films, and illustrates the advantages and disadvantages through a comparison with MOF- based membranes.
Journal ArticleDOI
Covalent organic frameworks: an ideal platform for designing ordered materials and advanced applications
Ruoyang Liu,Ke Tian Tan,Yifan Gong,Yongzhi Chen,Zhuoer Li,Shuailei Xie,Ting He,Zhen Lu,Hao Yang,Donglin Jiang +9 more
TL;DR: This review focuses on analysing the historic developments of COFs to uncover a full materials and application picture by providing comprehensive yet clear guidance for molecular design, synthetic control and functional exploration.
Journal ArticleDOI
Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions
Xinyi Chen,Keyu Geng,Ruoyang Liu,Ke Tian Tan,Yifan Gong,Zhongping Li,Shanshan Tao,Qiuhong Jiang,Donglin Jiang +8 more
TL;DR: This review summarizes the fundamentals as well as major progress by focusing on the chemistry to design structures including principle, synthetic strategies and control methods, and proposes major fundamental issues to be addressed in chemistry and future directions from physics, materials and application perspectives.
References
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Journal ArticleDOI
Selective gas adsorption and separation in metal–organic frameworks
TL;DR: This critical review starts with a brief introduction to gas separation and purification based on selective adsorption, followed by a review of gas selective adsorbents in rigid and flexible MOFs, and primary relationships between adsorptive properties and framework features are analyzed.
Journal ArticleDOI
Introduction to Metal–Organic Frameworks
Journal ArticleDOI
Porous, Crystalline, Covalent Organic Frameworks
Adrien P. Côté,Annabelle I. Benin,Nathan W. Ockwig,Michael O'Keeffe,Adam J. Matzger,Omar M. Yaghi +5 more
TL;DR: Covalent organic frameworks (COFs) have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid and hexahydroxytriphenylene to form rigid porous architectures with pore sizes ranging from 7 to 27 angstroms.
Journal ArticleDOI
The upper bound revisited
TL;DR: The empirical upper bound relationship for membrane separation of gases initially published in 1991 has been reviewed with the myriad of data now presently available as mentioned in this paper, which indicates a different solubility selectivity relationship for perfluorinated polymers compared to hydrocarbon/aromatic polymers.
Book
Membrane Technology and Applications
TL;DR: Overview of membrane science and technology membrane transport theory membrane and modules concentration polarization reverse osmosis ultrafiltration microfiltration gas separation pervaporation ion exchange membrane processes - electrodialysis carrier facilitated transport medical applications of membranes other membranes processed.