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Polymers
Special Issues
Advances in Separation and Purification with Polymeric Membranes
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Advances in Separation and Purification with Polymeric Membranes

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Membranes and Films".

Deadline for manuscript submissions: closed (25 May 2023) | Viewed by 4186

Special Issue Editor

Dr. Zilong Liu

E-Mail Website
Guest Editor
College of Science, China University of Petroleum-Beijing, Beijing 102249, China
Interests: membranes; gas adsorption and separation; carbon capture, utilisation and storage (CCUS); wastewater; desalination; sustainable materials; surface and interface; computational chemistry

Special Issue Information

Dear Colleagues,

The rapid growth of the membrane market was driven by advances in polymer science and membrane process engineering. Compared to other purification processes, membrane is known for its system compactness, energy efficiency, operational simplicity, and ability to overcome thermodynamic limitations. Membrane technology is displacing established molecular-separation processes by avoiding energy-intensive phase changes, achieving higher efficiency at lower cost. Membrane separation technology is widely used in gas separation, water purification, organic solvent separation, and ion exchange/transport in fuel cells and lithium-sulfur batteries.

The use of the electrospinning techniques, ionic liquids (ILs), molecular organic frameworks (MOFs), zeolitic imidazolate frameworks (ZIFs), and the preparation of mixed matrix membranes (MMMs), which combine a polymeric matrix with an inorganic filler, have all blossomed over the last decade. Additionally, the two-dimensional (2D) porous organic polymer (POP) materials including the 2D covalent organic frameworks (COFs), 2D covalent triazine frameworks (CTFs), 2D graphitic carbon nitride (CN) nanosheets and 2D conjugated microporous polymers (CMPs) have shown potential in the application of gas separation, water treatment, organic solvent nanofiltration (OSN), and evaporation.

In general, this Special Issue is oriented to experimental studies and theoretical analyses of phenomena associated with and arising from separation and purification as well as process development and simulation, equipment design and fabrication. Of particular interest are articles aimed at solving separation issues encountered in emerging technologies including fields such as carbon capture, unconventional gas, green technology, biotechnology, energy storage and conversion, and resource recovery and recycling.

Dr. Zilong Liu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • polymeric membranes
  • 2D polymers
  • gas separation
  • carbon capture
  • hydrogen purification
  • water purification
  • ion exchange
  • microfiltration
  • ultrafiltration
  • nanofiltration

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Published Papers (2 papers)

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Research

25 pages, 7468 KiB  
Article
Multifunctional Heterogeneous Ion-Exchange Membranes for Ion and Microbe Removal in Low-Salinity Water
by Fulufhelo Hope Mudau, Francis Hassard, Machawe Mxolisi Motsa and Lueta-Ann De Kock
Polymers 2023, 15(4), 843; https://doi.org/10.3390/polym15040843 - 8 Feb 2023
Cited by 1 | Viewed by 1665
Abstract
Here, multifunctional heterogeneous ion-exchange metal nanocomposite membranes were prepared for surface water desalination and bacterial inactivation under low-pressure (0.05 MPa) filtration conditions. Ultrafiltration (UF) heterogeneous ion exchange membranes (IEMs) were modified with different concentrations of AgNO3 and CuSO4 solutions using the [...] Read more.
Here, multifunctional heterogeneous ion-exchange metal nanocomposite membranes were prepared for surface water desalination and bacterial inactivation under low-pressure (0.05 MPa) filtration conditions. Ultrafiltration (UF) heterogeneous ion exchange membranes (IEMs) were modified with different concentrations of AgNO3 and CuSO4 solutions using the intermatrix synthesis (IMS) technique to produce metal nanocomposite membranes. Scanning electron microscopy (SEM) images revealed that the metal nanoparticles (MNPs) (Ag and Cu) were uniformly distributed on the surface and the interior of the nanocomposite membranes. With increasing metal precursor solution concentration (0.01 to 0.05 mol·L−1), the metal content of Ag and Cu nanocomposite membranes increased from 0.020 to 0.084 mg·cm−2 and from 0.031 to 0.218 m·cm−2 respectively. Results showed that the hydrodynamic diameter diameters of Ag and Cu nanoparticles (NPs) increased from 62.42 to 121.10 nm and from 54.2 to 125.7 nm respectively, as the metal precursor concentration loaded increased. The leaching of metals from metal nanocomposite membranes was measured in a dead-end filtration system, and the highest leaching concentration levels were 8.72 ppb and 5.32 ppb for Ag and Cu, respectively. The salt rejection studies indicated that ionic selectivity was improved with increasing metal content. Bacterial filtration showed higher antibacterial activity for metal nanocomposite membranes, reaching 3.6 log bacterial inactivation. Full article
(This article belongs to the Special Issue Advances in Separation and Purification with Polymeric Membranes)
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21 pages, 5669 KiB  
Article
Aromatic Polyimide Membranes with tert-Butyl and Carboxylic Side Groups for Gas Separation Applications—Covalent Crosslinking Study
by Noelia Esteban, Marta Juan-y-Seva, Carla Aguilar-Lugo, Jesús A. Miguel, Claudia Staudt, José G. de la Campa, Cristina Álvarez and Ángel E. Lozano
Polymers 2022, 14(24), 5517; https://doi.org/10.3390/polym14245517 - 16 Dec 2022
Cited by 2 | Viewed by 2019
Abstract
A set of aromatic copolyimides was obtained by reaction of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), and mixtures of the diamines 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2,5-di-tert-butylbenzene (CF3TBAPB) and 3,5-diamino benzoic acid (DABA). These polymers were characterized and compared with the homopolymer derived from 6FDA and [...] Read more.
A set of aromatic copolyimides was obtained by reaction of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), and mixtures of the diamines 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2,5-di-tert-butylbenzene (CF3TBAPB) and 3,5-diamino benzoic acid (DABA). These polymers were characterized and compared with the homopolymer derived from 6FDA and CF3TBAPB. All copolyimides showed high molecular weight values and good mechanical properties. The presence of carboxylic groups in these copolymers allowed their chemical crosslinking by reaction with 1,4-butanediol. Glass transition temperatures (Tg) were higher than 260 °C, showing the non-crosslinked copolyimides had the highest Tg values. Degradation temperature of crosslinked copolyimides was lower than their corresponding non-crosslinked ones. Mechanical properties of all polymers were good, and thus, copolyimide (precursor, and crosslinked ones) films could be tested as gas separation membranes. It was observed that CO2 permeability values were around 100 barrer. Finally, the plasticization resistance of the crosslinked material having a large number of carboxylic groups was excellent. Full article
(This article belongs to the Special Issue Advances in Separation and Purification with Polymeric Membranes)
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