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Membranes
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Feature Papers in Membrane Chemistry
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Feature Papers in Membrane Chemistry

A topical collection in Membranes (ISSN 2077-0375). This collection belongs to the section "Membrane Chemistry".

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Editors

Dr. Alberto Figoli

E-Mail Website
Collection Editor
Institute on Membrane Technology, National Research Council, ITM-CNR, 87036 Arcavacata di Rende, Italy
Interests: polymeric membranes; sustainable membrane preparation; bio-polymeric membranes; flat membranes; hollow-fibers; nano fibers; membrane preparation; membrane characterization; pervaporation; antifouling coatings; self-cleaning membranes; ultra-micro filtration
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Philippe Knauth

E-Mail Website
Collection Editor
Electrochemistry of Materials Group and International Associated Laboratory: Ionomer Materials for Energy, Aix Marseille Université, CNRS, Madirel (UMR 7246), Campus St Jérôme, 13013 Marseille, France
Interests: solid state ionics; electrochemical energy technologies; ion-conducting polymers; ionomer membranes; nanostructured materials
Special Issues, Collections and Topics in MDPI journals

Topical Collection Information

Dear Colleagues,

Membranes is also open to submission (research articles, short communications, and review articles) on fundamental principles and applications related to membrane chemistry. This Topical Collection targets the rapid publication of manuscripts related to all essential aspects of membrane chemistry, including the synthesis of novel membrane materials, membrane characterization using advanced analytical techniques, and new emerging separation processes, as well as various theoretical approaches toward the description of membrane transport and separation. The topics include (but are not limited to):

Membrane synthesis (e.g., polymeric, ceramic, mixed matrix, nanostructured, etc.);

  • Advances in membrane chemistry;
  • Membrane formation mechanisms;
  • Synthesis–structure–property relationships;
  • Inorganic and organic chemistry;
  • Physical chemistry;
  • Materials science;
  • Polymer science;
  • Nanoscience and nanotechnology.

Dr. Alberto Figoli
Prof. Dr. Philippe Knauth
Collection Editors

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 collection 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. Membranes is an international peer-reviewed open access monthly 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

  • membrane preparation and modification
  • membrane functionalization
  • membrane structure and function
  • mixed matrix membranes
  • composites
  • nanoassembly
  • nanomaterials
  • organic synthesis
  • sol–gel chemistry
  • biochemistry and molecular biology

Published Papers (6 papers)

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2023

Jump to: 2022

12 pages, 2259 KiB  
Article
Preparation of Protein A Membrane Adsorbers Using Strain-Promoted, Copper-Free Dibenzocyclooctyne (DBCO)-Azide Click Chemistry
by Joshua Osuofa and Scott M. Husson
Membranes 2023, 13(10), 824; https://doi.org/10.3390/membranes13100824 - 06 Oct 2023
Viewed by 1503
Abstract
Protein A chromatography is the preferred unit operation for purifying Fc-based proteins. Convective chromatography technologies, like membrane adsorbers, can perform the purification rapidly and improve throughput dramatically. While the literature reports the preparation of Protein A membrane adsorbers utilizing traditional coupling chemistries that [...] Read more.
Protein A chromatography is the preferred unit operation for purifying Fc-based proteins. Convective chromatography technologies, like membrane adsorbers, can perform the purification rapidly and improve throughput dramatically. While the literature reports the preparation of Protein A membrane adsorbers utilizing traditional coupling chemistries that target lysine or thiol groups on the Protein A ligand, this study demonstrates a new approach utilizing copper-free dibenzocyclooctyne (DBCO)-azide click chemistry. The synthetic pathway consists of three main steps: bioconjugation of Protein A with a DBCO-polyethylene glycol (PEG) linker, preparation of an azide-functionalized membrane surface, and click reaction of DBCO-Protein A onto the membrane surface. Using polyclonal human immunoglobulins (hIgG) as the target molecule, Protein A membranes prepared by this synthetic pathway showed a flowrate-independent dynamic binding capacity of ~10 mg/mL membrane at 10% breakthrough. Fitting of static binding capacity measurements to the Langmuir adsorption isotherm showed a maximum binding (qmax) of 27.48 ± 1.31 mg/mL and an apparent equilibrium dissociation constant (Kd) of value of 1.72 × 10−1 ± 4.03 × 10−2 mg/mL. This work represents a new application for copper-less click chemistry in the membrane chromatography space and outlines a synthetic pathway that can be followed for immobilization of other ligands. Full article
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30 pages, 3730 KiB  
Review
Recovery of Homogeneous Platinoid Catalysts from Pharmaceutical Media: Review on the Existing Treatments and the Perspectives of Membrane Processes
by Adrien Magne, Emilie Carretier, Lilivet Ubiera Ruiz, Thomas Clair, Morgane Le Hir and Philippe Moulin
Membranes 2023, 13(8), 738; https://doi.org/10.3390/membranes13080738 - 17 Aug 2023
Viewed by 1195
Abstract
Catalyst recovery is a major challenge for reaching the objectives of green chemistry for industry. Indeed, catalysts enable quick and selective syntheses with high reaction yields. This is especially the case for homogeneous platinoid catalysts which are almost indispensable for cross-coupling reactions often [...] Read more.
Catalyst recovery is a major challenge for reaching the objectives of green chemistry for industry. Indeed, catalysts enable quick and selective syntheses with high reaction yields. This is especially the case for homogeneous platinoid catalysts which are almost indispensable for cross-coupling reactions often used by the pharmaceutical industry. However, they are based on scarce, expensive, and toxic resources. In addition, they are quite sensitive and degrade over time at the end of the reaction. Once degraded, their regeneration is complex and hazardous to implement. Working on their recovery could lead to highly effective catalytic chemistries while limiting the environmental and economic impacts of their one-time uses. This review aims to describe and compare conventional processes for metal removal while discussing their advantages and drawbacks considering the objective of homogeneous catalyst recovery. Most of them lead to difficulty recycling active catalysts due to their ability to only treat metal ions or to chelate catalysts without the possibility to reverse the mechanism. However, membrane processes seem to offer some perspectives with limiting degradations. While membranes are not systematically the best option for recycling homogeneous catalysts, current development might help improve the separation between pharmaceutical active ingredients and catalysts and enable their recycling. Full article
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16 pages, 8410 KiB  
Article
Electrodeposited Ionomer Protection Layer for Negative Electrodes in Zinc–Air Batteries
by Papa K. Kwarteng, Suanto Syahputra, Luca Pasquini, Florence Vacandio, Maria Luisa Di Vona and Philippe Knauth
Membranes 2023, 13(7), 680; https://doi.org/10.3390/membranes13070680 - 20 Jul 2023
Cited by 1 | Viewed by 1220
Abstract
The protection of zinc anodes in zinc–air batteries (ZABs) is an efficient way to reduce corrosion and Zn dendrite formation and improve cyclability and battery efficiency. Anion-conducting poly(N-vinylbenzyl N,N,N-trimethylammonium)chloride (PVBTMA) thin films were electrodeposited directly on zinc metal using cyclic voltammetry. This deposition [...] Read more.
The protection of zinc anodes in zinc–air batteries (ZABs) is an efficient way to reduce corrosion and Zn dendrite formation and improve cyclability and battery efficiency. Anion-conducting poly(N-vinylbenzyl N,N,N-trimethylammonium)chloride (PVBTMA) thin films were electrodeposited directly on zinc metal using cyclic voltammetry. This deposition process presents a combination of advantages, including selective anion transport in PVBTMA reducing zinc crossover, high interface quality by electrodeposition improving the corrosion protection of zinc and high ionomer stiffness opposing zinc dendrite perforation. The PVBTMA layer was observed by optical and electron microscopy, and the wettability of the ionomer-coated surface was investigated by contact angle measurements. ZABs with PVBTMA-coated Zn showed an appreciable and stable open-circuit voltage both in alkaline electrolyte (1.55 V with a Pt cathode) and in miniaturized batteries (1.31 V with a carbon paper cathode). Cycling tests at 0.5 mA/cm2 within voltage limits of 2.1 and 0.8 V gave a stable discharge capacity for nearly 100 cycles with a liquid electrolyte and more than 20 cycles in miniaturized batteries. The faster degradation of the latter ZAB was attributed to the clogging of the carbon air cathode and drying or carbonation of the electrolyte sorbed in a Whatman paper. Full article
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14 pages, 2773 KiB  
Article
Permeation Properties of Water Vapor through Graphene Oxide/Polymer Substrate Composite Membranes
by Risa Takenaka, Norihiro Moriyama, Hiroki Nagasawa, Masakoto Kanezashi and Toshinori Tsuru
Membranes 2023, 13(5), 533; https://doi.org/10.3390/membranes13050533 - 21 May 2023
Cited by 4 | Viewed by 1418
Abstract
Graphene oxide (GO) has attracted attention as an excellent membrane material for water treatment and desalination owing to its high mechanical strength, hydrophilicity, and permeability. In this study, composite membranes were prepared by coating GO on various polymeric porous substrates (polyethersulfone, cellulose ester, [...] Read more.
Graphene oxide (GO) has attracted attention as an excellent membrane material for water treatment and desalination owing to its high mechanical strength, hydrophilicity, and permeability. In this study, composite membranes were prepared by coating GO on various polymeric porous substrates (polyethersulfone, cellulose ester, and polytetrafluoroethylene) using suction filtration and casting methods. The composite membranes were used for dehumidification, that is, water vapor separation in the gas phase. GO layers were successfully prepared via filtration rather than casting, irrespective of the type of polymeric substrate used. The dehumidification composite membranes with a GO layer thickness of less than 100 nm showed a water permeance greater than 1.0 × 10−6 mol/(m2 s Pa) and a H2O/N2 separation factor higher than 104 at 25 °C and 90–100% humidity. The GO composite membranes were fabricated in a reproducible manner and showed stable performance as a function of time. Furthermore, the membranes maintained high permeance and selectivity at 80°C, indicating that it is useful as a water vapor separation membrane. Full article
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2022

Jump to: 2023

15 pages, 38959 KiB  
Article
The Use of Diethoxydimethylsilane as the Basis of a Hybrid Organosilicon Material for the Production of Biosensitive Membranes for Sensory Devices
by Olga A. Kamanina, Elizaveta A. Lantsova, Pavel V. Rybochkin, Vyacheslav A. Arlyapov, Yulia V. Plekhanova and Anatoly N. Reshetilov
Membranes 2022, 12(10), 983; https://doi.org/10.3390/membranes12100983 - 10 Oct 2022
Cited by 3 | Viewed by 1423
Abstract
Biomembranes based on an organosilica sol–gel matrix were used to immobilize bacteria Paracoccus yeei VKM B-3302 as part of a biochemical oxygen demand (BOD) biosensor. Diethoxydimethylsilane (DEDMS) and tetraethoxysilane (TEOS) were used as precursors to create the matrix in a 1:1 volume ratio. [...] Read more.
Biomembranes based on an organosilica sol–gel matrix were used to immobilize bacteria Paracoccus yeei VKM B-3302 as part of a biochemical oxygen demand (BOD) biosensor. Diethoxydimethylsilane (DEDMS) and tetraethoxysilane (TEOS) were used as precursors to create the matrix in a 1:1 volume ratio. The use of scanning electron microscopy (SEM) and the low-temperature nitrogen adsorption method (BET) showed that the sol–gel matrix forms a capsule around microorganisms that does not prevent the exchange of substrates and waste products of bacteria to the cells. The use of DEDMS as part of the matrix made it possible to increase the sensitivity coefficient of the biosensor for determining BOD by two orders of magnitude compared to a biosensor based on methyltriethoxysilane (MTES). Additionally, the long-term stability of the bioreceptor increased to 68 days. The use of such a matrix neutralized the effect of heavy metal ions on the microorganisms’ catalytic activity in the biosensor. The developed biosensor was used to analyze water samples from water sources in the Tula region (Russia). Full article
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12 pages, 1385 KiB  
Article
Anion-Conducting Polymer Electrolyte without Ether Linkages and with Ionic Groups Grafted on Long Side Chains: Poly(Alkylene Biphenyl Butyltrimethyl Ammonium) (ABBA)
by Riccardo Narducci, Raul Andres Becerra-Arciniegas, Luca Pasquini, Gianfranco Ercolani, Philippe Knauth and Maria Luisa Di Vona
Membranes 2022, 12(3), 337; https://doi.org/10.3390/membranes12030337 - 18 Mar 2022
Cited by 2 | Viewed by 2238
Abstract
In this work we report the synthesis of the new ionomer poly(alkylene biphenyl butyltrimethyl ammonium) (ABBA) with a backbone devoid of alkaline-labile C-O-C bonds and with quaternary ammonium groups grafted on long side chains. The ionomer was achieved by metalation reaction with n [...] Read more.
In this work we report the synthesis of the new ionomer poly(alkylene biphenyl butyltrimethyl ammonium) (ABBA) with a backbone devoid of alkaline-labile C-O-C bonds and with quaternary ammonium groups grafted on long side chains. The ionomer was achieved by metalation reaction with n-butyllithium of 2-bromobiphenyl, followed by the introduction of the long chain with 1,4-dibromobutane. The reaction steps were followed by 1H-NMR spectroscopy showing the characteristic signals of the Br-butyl chain and indicating the complete functionalization of the biphenyl moiety. The precursor was polycondensed with 1,1,1-trifluoroacetone and then quaternized using trimethylamine (TMA). After the acid catalyzed polycondensation, the stoichiometric ratio between the precursors was respected. The quaternization with TMA gave a final degree of amination of 0.83 in agreement with the thermogravimetric analysis and with the ion exchange capacity of 2.5 meq/g determined by acid–base titration. The new ionomer blended with poly(vinylalcohol) (PVA) or poly(vinylidene difluoride) (PVDF) was also characterized by water uptake (WU) and ionic conductivity measurements. The higher water uptake and ionic conductivity observed with the PVDF blend might be related to a better nanophase separation. Full article
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