Conjugate polymer-based membranes for gas separation applications: current status and future prospects

Saini, Nishel; Pandey, Kamakshi; Awasthi, Kamlendra

doi:10.1016/j.mtchem.2021.100558

Cited by 21 publications

(16 citation statements)

References 125 publications

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“…The Fourier transform infrared (FTIR) spectra of the CMPs (Supplementary Figs. [18][19][20] showed peaks at 1698-1721 cm -1 for nonaromatic C=C bonds (polyacetylene backbone), as separated from the peaks at 1560-1639 cm -1 for aromatic (pyridine) C=C bonds. The alkene C-H stretch (=C-H stretch) in the polyacetylene backbone also appeared at 2968-3047 cm -1 .…”

Section: Radical Spp Of Monomer Cocrystalsmentioning

confidence: 96%

“…While polyacetylenes are generally synthesized from acetylene monomers (CR≡CR) via metalcatalyzed coordination polymerization in solutions 11,12 , a metal-free synthetic method is desired for applications in which metal contaminants are undesirable.Apart from linear conjugated polymers, two-dimensional conjugated microporous polymers (2D CMPs) are another type of conjugated polymers, in which conjugated polymer sheets are noncovalently or covalently cumulated in layer-by-layer manners to form regulated and rigid porous structures [13][14][15][16][17] . 2D CMPs have found various applications in gas separation, energy storage, and selective sieving of metal ions from a mixture of ions [18][19][20][21] . There are numerous synthetic studies of 2D CMPs using metal-catalyzed reactions 11 .…”

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confidence: 99%

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2D conjugated microporous polyacetylenes synthesized via halogen-bond-assisted radical solid-phase polymerization for high-performance metal-ion absorbents

Wang

Goto

2023

Nat Commun

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The paper reports the first free-radical solid-phase polymerization (SPP) of acetylenes. Acetylene monomers were co-crystalized using halogen bonding, and the obtained cocrystals were polymerized. Notably, because of the alignment of acetylene monomers in the cocrystals, the adjacent C≡C groups were close enough to undergo radical polymerization effectively, enabling the radically low-reactive acetylene monomers to generate high-molecular-weight polyacetylenes that are unattainable in solution-phase radical polymerizations. Furthermore, the SPP of a crosslinkable diacetylene monomer yielded networked two-dimensional conjugated microporous polymers (2D CMPs), where 2D porous polyacetylene nanosheets were cumulated in layer-by-layer manners. Because of the porous structures, the obtained 2D CMPs worked as highly efficient and selective adsorbents of lithium (Li+) and boronium (B3+) ions, adsorbing up to 312 mg of Li+ (31.2 wt%) and 196 mg of B3+ (19.6 wt%) per 1 g of CMP. This Li+ adsorption capacity is the highest ever record in the area of Li+ adsorption.

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Section: Radical Spp Of Monomer Cocrystalsmentioning

confidence: 96%

mentioning

confidence: 99%

2D conjugated microporous polyacetylenes synthesized via halogen-bond-assisted radical solid-phase polymerization for high-performance metal-ion absorbents

Wang

Goto

2023

Nat Commun

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“…Furthermore, the conductive polymers are easy to be doped due to the presence of conjugated chain bonding [ 116 ]. As compared to conventional polymers, these polymers possess the advantages of a small electronic bandgap (e.g., 1–3.5 eV), easily modified by the charge transfer process, and having high electrical conductivity [ 117 ]. Hence, conjugate polymers are widely found in many applications, such as solar cells [ 118 ], fuels cells [ 119 ], gas sensing [ 120 ], and particularly the synthesis membranes [ 121 , 122 ].…”

Section: Types Of Hollow Fiber and Their Preparation Routementioning

confidence: 99%

“…The huge π-systems in conductive polymers provide stiff polymer chains with low packing density. Thus, they form a rigid polymer structure that offers more restriction toward the gas diffusion across the membrane [ 117 ], demonstrating the molecular size sieving properties of conductive polymer. Meanwhile, the organic group in a conductive polymer (e.g., -NH 2 ) acts as the carrier to facilitate the transport of desired gas via a reversible chemical reaction with gas molecules [ 464 ], demonstrating its carrier-mediated transport properties.…”

Section: Applications Of Hollow Fiber Membranesmentioning

confidence: 99%

“…Examples of conductive polymers that have been extensively reported for gas separation include PANI [ 111 , 467 , 468 , 469 , 470 , 471 , 472 , 473 , 474 , 475 , 476 , 477 , 478 , 479 , 480 , 481 ], polypyrrole [ 482 , 483 , 484 , 485 , 486 , 487 , 488 , 489 ], and polythiophene [ 490 , 491 , 492 ]. A comprehensive review of conductive polymer-based membranes for gas separation application was reported recently [ 117 ]. Noteworthy, Mattes’ group had conducted a few preliminary studies on conductive polymer fibers [ 493 , 494 , 495 , 496 , 497 , 498 , 499 , 500 , 501 ].…”

Section: Applications Of Hollow Fiber Membranesmentioning

confidence: 99%

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State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

Lau

Soh

et al. 2022

Membranes

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The aggravation of environmental problems such as water scarcity and air pollution has called upon the need for a sustainable solution globally. Membrane technology, owing to its simplicity, sustainability, and cost-effectiveness, has emerged as one of the favorable technologies for water and air purification. Among all of the membrane configurations, hollow fiber membranes hold promise due to their outstanding packing density and ease of module assembly. Herein, this review systematically outlines the fundamentals of hollow fiber membranes, which comprise the structural analyses and phase inversion mechanism. Furthermore, illustrations of the latest advances in the fabrication of organic, inorganic, and composite hollow fiber membranes are presented. Key findings on the utilization of hollow fiber membranes in microfiltration (MF), nanofiltration (NF), reverse osmosis (RO), forward osmosis (FO), pervaporation, gas and vapor separation, membrane distillation, and membrane contactor are also reported. Moreover, the applications in nuclear waste treatment and biomedical fields such as hemodialysis and drug delivery are emphasized. Subsequently, the emerging R&D areas, precisely on green fabrication and modification techniques as well as sustainable materials for hollow fiber membranes, are highlighted. Last but not least, this review offers invigorating perspectives on the future directions for the design of next-generation hollow fiber membranes for various applications. As such, the comprehensive and critical insights gained in this review are anticipated to provide a new research doorway to stimulate the future development and optimization of hollow fiber membranes.

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Recent Advancements in Metal‐Organic Framework‐Based Membranes for Hydrogen Separation: A Review

Baig,

Waheed,

Jillani

2023

Chemistry An Asian Journal

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Metal‐organic frameworks (MOFs) are promising porous materials that have huge potential for gas separation when put in the membrane configuration. MOFs have huge potential of the MOFs such as excellent pore size, ease of tuning the pore chemistry, higher surface area, and chemical and thermal stabilities, MOFs have been explored for various gas separation and storage applications. This review discusses various approaches for fabricating MOFs‐based membranes for the separation of H2 gas from a variety of feeds having various gases CO2, CO, N2, and CH4 as impurities. The emphasis has been put on three types of membranes for H2 separation which include MOFs‐based hollow fibrous/tubular/disk membranes, MOFs‐based mixed matrix membranes (MMMs), and MOFs‐based stand‐alone membranes. In addition, various challenges such as reducing inhomogeneity between MOFs and polymeric matrices have also been discussed. Similarly, the approaches to successfully decorating MOFs on different supports in different configurations have been explained. The possible ways of improving the MOFs‐based membranes for H2 have also been discussed.

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Conjugate polymer-based membranes for gas separation applications: current status and future prospects

Cited by 21 publications

References 125 publications

2D conjugated microporous polyacetylenes synthesized via halogen-bond-assisted radical solid-phase polymerization for high-performance metal-ion absorbents

2D conjugated microporous polyacetylenes synthesized via halogen-bond-assisted radical solid-phase polymerization for high-performance metal-ion absorbents

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

Recent Advancements in Metal‐Organic Framework‐Based Membranes for Hydrogen Separation: A Review

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