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Membranes, Volume 14, Issue 4

April 2024 - 23 articles

Cover Story: Ion-selective electrodes (ISEs) with membranes containing ionophores are increasingly used under non-zero current conditions, i.e., voltammetry and constant potential coulometry. The signals are interpreted assuming the Nernstian response of the ISEs, while the Nernst equation implies an electrochemical equilibrium at the membrane/sample interface. The following question arises: is the equilibrium violated by these currents? We show here that the exchange current estimated by impedance and chronopotentiometric measurements with Na+-ISE as a model system is significantly larger than the current flowing through ISEs during analysis in non-zero-current modes. This suggests that the equilibrium is not violated by the current flow, and implies validity of the Nernst equation for the interpretation of the data. View this paper
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Articles (23)

  • Communication
  • Open Access
2 Citations
2,924 Views
13 Pages

Electrically conductive membranes (ECMs) have emerged as a multifunctional separation technology that integrates membrane filtration with electrochemical reactions. Physical stability remains a critical challenge for ECMs synthesized by coating polym...

  • Article
  • Open Access
11 Citations
3,383 Views
15 Pages

Removal of Methylene Blue Dye from Aqueous Solutions Using Polymer Inclusion Membrane Containing Calix[4]pyrrole

  • Anna Nowik-Zajac,
  • Iwona Zawierucha,
  • Jakub Lagiewka,
  • Karolina Jaksender,
  • Katarzyna Witt,
  • Grzegorz Malina and
  • Vira Sabadash

The effective purification of aqueous solutions of methylene blue dye was tested using polymer inclusion membranes (PIMs) that contained cellulose triacetate (CTA) as a polymer base, o-nitrophenyl octyl ether (o-NPOE) as a plasticizer, and meso-tetra...

  • Article
  • Open Access
8 Citations
2,697 Views
14 Pages

Zeolite serves as a promising additive for enhancing the hydrophilicity of polymeric membranes, yet its utilization for bolstering the mechanical strength of the membrane remains limited. In this study, poly(vinylidene fluoride) (PVDF) membranes were...

  • Article
  • Open Access
4 Citations
3,451 Views
13 Pages

Influence of Process Parameters on the Efficiency of Pervaporation Pilot ECO-001 Plant for Raw Ethanol Dehydration

  • Anna Kujawska,
  • Wojciech Kujawski,
  • Wiesław Capała,
  • Urszula Kiełkowska,
  • Marek Plesnar and
  • Joanna Kujawa

Pervaporation is a membrane-based process used for the separation of liquid mixtures. As this membrane process is governed by the differences in the sorption and diffusivities of separated components, close boiling mixtures and azeotropic mixtures ca...

  • Article
  • Open Access
2,565 Views
21 Pages

Fine-grained molecular dynamics simulations have been conducted to depict lipid objects enclosed in water and interacting with a series of noble gases dissolved in the medium. The simple point-charge (SPC) water system, featuring a boundary composed...

  • Article
  • Open Access
3 Citations
2,718 Views
18 Pages

Tofu whey, a by-product of tofu production, is rich in nutrients such as proteins, minerals, fats, sugars and polyphenols. In a previous work, protein recovery from tofu whey was studied by using a coupled environmental process of ED + EDBM to valori...

  • Article
  • Open Access
11 Citations
4,009 Views
17 Pages

Environmentally Friendly Photothermal Membranes for Halite Recovery from Reverse Osmosis Brine via Solar-Driven Membrane Crystallization

  • Marco Aquino,
  • Sergio Santoro,
  • Antonio Politano,
  • Giuseppe D’Andrea,
  • Alessio Siciliano,
  • Salvatore Straface,
  • Mauro Francesco La Russa and
  • Efrem Curcio

Modern society and industrial development rely heavily on the availability of freshwater and minerals. Seawater reverse osmosis (SWRO) has been widely adopted for freshwater supply, although many questions have arisen about its environmental sustaina...

  • Article
  • Open Access
10 Citations
4,030 Views
20 Pages

3D-CFD Modeling of Hollow-Fiber Membrane Contactor for CO2 Absorption Using MEA Solution

  • Alexandru-Constantin Bozonc,
  • Vlad-Cristian Sandu,
  • Calin-Cristian Cormos and
  • Ana-Maria Cormos

Membrane technology is considered an innovative and promising approach due to its flexibility and low energy consumption. In this work, a comprehensive 3D-CFD model of the Hollow-Fiber Membrane Contactor (HFMC) system for CO2 capture into aqueous MEA...

  • Review
  • Open Access
53 Citations
18,917 Views
24 Pages

In recent years, anion exchange membranes (AEMs) have aroused widespread interest in hydrogen production via water electrolysis using renewable energy sources. The two current commercial low-temperature water electrolysis technologies used are alkali...

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Membranes - ISSN 2077-0375