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Ion and Molecule Transport in Membrane Systems 5.0
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Ion and Molecule Transport in Membrane Systems 5.0

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Physical Chemistry and Chemical Physics".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 6546

Special Issue Editor

Prof. Dr. Victor V. Nikonenko

E-Mail Website
Guest Editor
Department of Physical Chemistry, Kuban State University, 149 Stavropolskaya st., 350040 Krasnodar, Russia
Interests: ion-exchange membranes; structure-property relationships; transport phenomena; experiment; modelling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The scope of this Special Issue covers a large number of topics in the field of membrane science. We welcome papers that report upon experimental studies and mathematical modeling, and that provide new knowledge on the mechanisms of ion and molecule transport in artificial and living systems; provide the description of ion and molecule transport through all kinds of membranes, biological and artificial ones; similarities in the behavior of biological and artificial membranes; biomimetic structural features of artificial membranes, and their impact on membrane properties and performance in separation processes; generalities and case studies in the field of material structure–properties relationships; physicochemical and chemicophysical aspects of ion and molecule transport; thermodynamics and the description of irreversible thermodynamics; equilibria and the kinetics of transport processes in membrane systems; the coupling of ion and molecule transport with chemical reactions and catalysis; the impact of forced and natural convection on ions and molecule transport; the mechanisms of electric current-induced convection, and its impact on concentration polarization and ion and molecule transport; and the physicochemical and chemicophysical aspects of the transport, separation, purification, and fractionation of organic acids, bioactive compounds, ampholytes, and nutrients in membrane systems.

The purpose of this Special Issue is to collect original research articles and reviews concerning the topic of membrane science. Contributions from different fields of research at a molecular level are welcomed. Our aim is for this new Special Issue to collect high-quality manuscripts in the field of membranes.

Prof. Dr. Victor V. Nikonenko
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. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. 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

  • ion and molecular transport
  • physical chemistry
  • chemical physics
  • transport mechanisms
  • living systems
  • biological and artificial membranes
  • biomimetic structure
  • structure–property relationships
  • thermodynamics
  • irreversible thermodynamics
  • equilibriums
  • kinetics

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Published Papers (5 papers)

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Research

18 pages, 6242 KiB  
Article
New Approaches to the Creation of Highly Efficient Pd-Ag and Pd-Cu Membranes and Modeling of Their Hydrogen Permeability
by Iliya Petriev, Polina Pushankina and Michail Drobotenko
Int. J. Mol. Sci. 2024, 25(23), 12564; https://doi.org/10.3390/ijms252312564 - 22 Nov 2024
Abstract
Thin-film membranes of Pd-Ag and Pd-Cu alloys capable of releasing hydrogen in a wide temperature range have been developed. The surface activation of the membranes with a nanostructured coating made it possible to intensify hydrogen transport through Pd-containing membranes at low temperatures. This [...] Read more.
Thin-film membranes of Pd-Ag and Pd-Cu alloys capable of releasing hydrogen in a wide temperature range have been developed. The surface activation of the membranes with a nanostructured coating made it possible to intensify hydrogen transport through Pd-containing membranes at low temperatures. This effect was achieved by accelerating limiting surface processes by increasing the active area of the membrane. Surface-activated membranes demonstrated the highest values of hydrogen flux over the entire temperature range, which reached up to 49.4 mmol s−1 m−2 for Pd-Ag membranes and up to 32.9 mmol s−1 m−2 for Pd-Cu membranes. Membranes modified with filiform nanoparticles demonstrated a hydrogen flux up to 12 times higher than that of membranes with a smooth surface. Based on the results obtained, a theoretical model of hydrogen transport through metal membranes was developed, taking into account the effect of the state of the membrane surface on hydrogen transport at low temperatures. This model makes it possible to predict hydrogen flows in the entire temperature range much more accurately compared to other existing models. The selectivity and stability of the developed membranes over a long period of operation have been confirmed. The study of the effect of the surface activation of Pd-based membranes on the intensification of hydrogen permeability has shown the success of the method developed, which in turn opens up wide opportunities for creating low-temperature, highly efficient membrane hydrogen filters based on palladium and other devices based on them. Full article
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems 5.0)
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24 pages, 6961 KiB  
Article
Structural Characterization and Physicochemical Properties of Functionally Porous Proton-Exchange Membrane Based on PVDF-SPA Graft Copolymers
by Maria Ponomar, Valentina Ruleva, Veronika Sarapulova, Natalia Pismenskaya, Victor Nikonenko, Alina Maryasevskaya, Denis Anokhin, Dimitri Ivanov, Jeet Sharma, Vaibhav Kulshrestha and Bruno Améduri
Int. J. Mol. Sci. 2024, 25(1), 598; https://doi.org/10.3390/ijms25010598 - 2 Jan 2024
Cited by 2 | Viewed by 1661
Abstract
Fluorinated proton-exchange membranes (PEMs) based on graft copolymers of dehydrofluorinated polyvinylidene fluoride (D-PVDF), 3-sulfopropyl acrylate (SPA), and 1H, 1H, 2H-perfluoro-1-hexene (PFH) were prepared via free radical copolymerization and characterized for fuel cell application. The membrane morphology and physical properties were studied via small-(SAXS) [...] Read more.
Fluorinated proton-exchange membranes (PEMs) based on graft copolymers of dehydrofluorinated polyvinylidene fluoride (D-PVDF), 3-sulfopropyl acrylate (SPA), and 1H, 1H, 2H-perfluoro-1-hexene (PFH) were prepared via free radical copolymerization and characterized for fuel cell application. The membrane morphology and physical properties were studied via small-(SAXS) and wide-angle X-ray scattering (WAXS), SEM, and DSC. It was found that the crystallinity degree is 17% for PEM-RCF (co-polymer with SPA) and 16% for PEM-RCF-2 (copolymer with SPA and PFH). The designed membranes possess crystallite grains of 5–6 nm in diameter. SEM images reveal a structure with open pores on the surface of diameters from 20 to 140 nm. Their transport and electrochemical characterization shows that the lowest membrane area resistance (0.9 Ωcm2) is comparable to perfluorosulfonic acid PEMs (such as Nafion®) and polyvinylidene fluoride (PVDF) based CJMC cation-exchange membranes (ChemJoy Polymer Materials, China). Key transport and physicochemical properties of new and commercial membranes were compared. The PEM-RCF permeability to NaCl diffusion is rather high, which is due to a relatively low concentration of fixed sulfonate groups. Voltammetry confers that the electrochemical behavior of new PEM correlates to that of commercial cation-exchange membranes, while the ionic conductivity reveals an impact of the extended pores, as in track-etched membranes. Full article
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems 5.0)
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16 pages, 3068 KiB  
Article
High-Performance Hydrogen-Selective Pd-Ag Membranes Modified with Pd-Pt Nanoparticles for Use in Steam Reforming Membrane Reactors
by Iliya Petriev, Polina Pushankina, Georgy Andreev, Sergei Ivanin and Stepan Dzhimak
Int. J. Mol. Sci. 2023, 24(24), 17403; https://doi.org/10.3390/ijms242417403 - 12 Dec 2023
Cited by 5 | Viewed by 1491
Abstract
A unique method for synthesizing a surface modifier for metallic hydrogen permeable membranes based on non-classic bimetallic pentagonally structured Pd-Pt nanoparticles was developed. It was found that nanoparticles had unique hollow structures. This significantly reduced the cost of their production due to the [...] Read more.
A unique method for synthesizing a surface modifier for metallic hydrogen permeable membranes based on non-classic bimetallic pentagonally structured Pd-Pt nanoparticles was developed. It was found that nanoparticles had unique hollow structures. This significantly reduced the cost of their production due to the economical use of metal. According to the results of electrochemical studies, a synthesized bimetallic Pd-Pt/Pd-Ag modifier showed excellent catalytic activity (up to 60.72 mA cm−2), long-term stability, and resistance to COads poisoning in the alkaline oxidation reaction of methanol. The membrane with the pentagonally structured Pd-Pt/Pd-Ag modifier showed the highest hydrogen permeation flux density, up to 27.3 mmol s−1 m−2. The obtained hydrogen flux density was two times higher than that for membranes with a classic Pdblack/Pd-Ag modifier and an order of magnitude higher than that for an unmodified membrane. Since the rate of transcrystalline hydrogen transfer through a membrane increased, while the speed of transfer through defects remained unchanged, a one and a half times rise in selectivity of the developed Pd-Pt/Pd-Ag membranes was recorded, and it amounted to 3514. The achieved results were due to both the synergistic effect of the combination of Pd and Pt metals in the modifier composition and the large number of available catalytically active centers, which were present as a result of non-classic morphology with high-index facets. The specific faceting, defect structure, and unusual properties provide great opportunities for the application of nanoparticles in the areas of membrane reactors, electrocatalysis, and the petrochemical and hydrogen industries. Full article
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems 5.0)
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14 pages, 2305 KiB  
Article
Bipolar Membrane Electrodialysis for Direct Conversion of L-Ornithine Monohydrochloride to L-Ornithine
by Jinfeng He, Wenlong Liu, Jianrong Hao, Xixi Ma, Zhiyi Zheng, Yinghan Fang, Yuxin Liang, Zhihao Tian, Li Sun, Chuanrun Li and Haiyang Yan
Int. J. Mol. Sci. 2023, 24(17), 13174; https://doi.org/10.3390/ijms241713174 - 24 Aug 2023
Cited by 1 | Viewed by 1243
Abstract
In this study, bipolar membrane electrodialysis was proposed to directly convert L-ornithine monohydrochloride to L-ornithine. The stack configuration was optimized in the BP-A (BP, bipolar membrane; A, anion exchange membrane) configuration with the Cl− ion migration through the anion exchange membrane rather [...] Read more.
In this study, bipolar membrane electrodialysis was proposed to directly convert L-ornithine monohydrochloride to L-ornithine. The stack configuration was optimized in the BP-A (BP, bipolar membrane; A, anion exchange membrane) configuration with the Cl− ion migration through the anion exchange membrane rather than the BP-A-C (C, cation exchange membrane) and the BP-C configurations with the L-ornithine+ ion migration through the cation exchange membrane. Both the conversion ratio and current efficiency follow BP-A > BP-A-C > BP-C, and the energy consumption follows BP-A < BP-A-C < BP-C. Additionally, the voltage drop across the membrane stack (two repeating units) and the feed concentration were optimized as 7.5 V and 0.50 mol/L, respectively, due to the low value of the sum of H+ ions leakage (from the acid compartment to the base compartment) and OH− ions migration (from the base compartment to the acid compartment) through the anion exchange membrane. As a result, high conversion ratio (96.1%), high current efficiency (95.5%) and low energy consumption (0.31 kWh/kg L-ornithine) can be achieved. Therefore, bipolar membrane electrodialysis is an efficient, low energy consumption and environmentally friendly method to directly convert L-ornithine monohydrochloride to L-ornithine. Full article
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems 5.0)
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14 pages, 3434 KiB  
Article
Impact of a Whey Protein Hydrolysate Treated by Electrodialysis with Ultrafiltration Membrane on the Development of Metabolic Syndrome and the Modulation of Gut Microbiota in Mice
by Valentine Renaud, Mélanie Faucher, Marie-Julie Dubois, Geneviève Pilon, Thibault Varin, André Marette and Laurent Bazinet
Int. J. Mol. Sci. 2023, 24(16), 12968; https://doi.org/10.3390/ijms241612968 - 19 Aug 2023
Viewed by 1420
Abstract
The development of Metabolic Syndrome (MetS) affects a large number of people around the world and represents a major issue in the field of health. Thus, it is important to implement new strategies to reduce its prevalence, and various approaches are currently under [...] Read more.
The development of Metabolic Syndrome (MetS) affects a large number of people around the world and represents a major issue in the field of health. Thus, it is important to implement new strategies to reduce its prevalence, and various approaches are currently under development. Recently, an eco-friendly technology named electrodialysis with ultrafiltration membrane (EDUF) was used successfully for the first time at a semi-industrial scale to produce three fractions concentrated in bioactive peptides (BPs) from an enzymatically hydrolyzed whey protein concentrate (WPC): the initial (F1), the final (F2) and the recovery fraction (F3), and it was demonstrated in vitro that F3 exhibited interesting DPP-IV inhibitory effects. Therefore, the present study aimed to evaluate the effect of each fraction on in vivo models of obesity. A daily dose of 312.5 mg/kg was administered to High Fat/High Sucrose diet (HFHS) induced C57BL6/J mice for eight weeks. The physiological parameters of each group and alterations of their gut microbiota by the fractions were assessed. Little effect of the different fractions was demonstrated on the physiological state of the mice, probably due to the digestion process of the BP content. However, there were changes in the gut microbiota composition and functions of mice treated with F3. Full article
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems 5.0)
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