scholarly journals Studies of Ion Exchange Membranes. XXX. The Tetrahydrofuran Extraction of the Ion-exchange Membrane and Its Base Membrane Prepared by the “Paste Method”

1969 ◽  
Vol 42 (9) ◽  
pp. 2459-2463 ◽  
Author(s):  
Yukio Mizutani
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Ion Exchange Membranes ◽  
Exchange Membrane

scholarly journals Characterization of Ion Exchange Membranes with Special Surface Structure

2017 ◽  
Author(s):  
Eliška Stránská ◽  
Kristýna Weinertová ◽  
David Neděla ◽  
Jan Křivčík
Keyword(s):  
Ion Exchange ◽  
Physical Properties ◽  
Surface Structure ◽  
Flat Surface ◽  
Ion Exchange Membrane ◽  
Membrane Properties ◽  
Ion Exchange Membranes ◽  
Geometrical Structures ◽  
Special Surface ◽  
Exchange Membrane

This article focuses on the preparation of the heterogeneous ion exchange membrane with a special surface structure made with three types of knitted fabric. The special surface structure of ion exchange membranes can be useful for the intensification of mass transfer processes in electrodialysis.Three types of structured ion exchange membranes were prepared together with a membrane with a flat surface to compare the influence of geometrical structures on the behaviour of ion exchange membrane properties. Electrochemical, mechanical and physical properties were determined. Structured membranes exhibited comparable electrochemical and physical properties to the flat ion exchange membrane. Some transport parameters were measured in an electrodialysis stack with two concentrations of solution. Two electrodialysis stacks with different sizes of active area were used for comparison. Improving efficiency and mass flux was not confirmed. It was not demonstrated that structured IEMs were not better than IEMs with the flat surface.

A multiple ion-exchange membrane design for redox flow batteries

2014 ◽  
Vol 7 (9) ◽  
pp. 2986-2998 ◽  
Author(s):  
Shuang Gu ◽  
Ke Gong ◽  
Emily Z. Yan ◽  
Yushan Yan
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Cell Design ◽  
Ion Exchange Membranes ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Battery Cell ◽  
Redox Flow Batteries ◽  
Membrane Design ◽  
Exchange Membrane

A redox-flow-battery cell design with multiple ion-exchange membranes is provided to enable combinations of any redox pairs and supporting electrolytes.

Hierarchical structural designs of ion exchange membranes for flow batteries

2019 ◽  
Vol 7 (10) ◽  
pp. 5794-5802 ◽  
Author(s):  
Xiujun Yue ◽  
Qian He ◽  
Hee-Dae Lim ◽  
Ping Liu
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Ion Exchange Membranes ◽  
Trade Off ◽  
Flow Batteries ◽  
Exchange Membrane

A hierarchically structured composite ion exchange membrane is developed to solve the trade-off between conductivity and selectivity.

scholarly journals Key elements and materials in microbial desalination cells

2021 ◽  
pp. 41-92
Author(s):  
Eduard Borràs ◽  
Martí Aliaguilla ◽  
Laura Huidobro ◽  
Sandra Martínez-Crespiera ◽  
Sonia Matencio ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Ion Exchange Membranes ◽  
Material Development ◽  
General Overview ◽  
Membrane Development ◽  
Exchange Membrane ◽  
Carbon Based

Abstract This chapter presents the most relevant advances achieved during the MIDES project in relation to material development of key elements for microbial desalination cells. The first section is devoted to electrodes. Providing a general overview of the requirements of carbon-based materials to serve either as anodes or cathodes for microbial desalination cells. Advances achieved during MIDES in the development of materials for anode and cathode application are listed. The second section is focussed on ion-exchange membranes for microbial desalination cells. General considerations for the use of these membranes are reported as well as key parameters. Finally, advances in ion-exchange membrane development, in terms of antifouling and their performance in desalination trials, achieved during the MIDES project, are reported.

Effect of the type of ion exchange membrane on performance, ion transport, and pH in biocatalyzed electrolysis of wastewater

2008 ◽  
Vol 57 (11) ◽  
pp. 1757-1762 ◽  
Author(s):  
R. A. Rozendal ◽  
T. H. J. A. Sleutels ◽  
H. V. M. Hamelers ◽  
C. J. N. Buisman
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Transport Numbers ◽  
Ion Exchange Membranes ◽  
Bipolar Membrane ◽  
Electrolysis Cells ◽  
Ph Increase ◽  
A Charge ◽  
Exchange Membrane ◽  
Biocatalyzed Electrolysis

Previous studies have shown that the application of cation exchange membranes (CEMs) in bioelectrochemical systems running on wastewater can cause operational problems. In this paper the effect of alternative types of ion exchange membrane is studied in biocatalyzed electrolysis cells. Four types of ion exchange membranes are used: (i) a CEM, (ii) an anion exchange membrane (AEM), (iii) a bipolar membrane (BPM), and (iv) a charge mosaic membrane (CMM). With respect to the electrochemical performance of the four biocatalyzed electrolysis configurations, the ion exchange membranes are rated in the order AEM > CEM > CMM > BPM. However, with respect to the transport numbers for protons and/or hydroxyl ions (tH/OH) and the ability to prevent pH increase in the cathode chamber, the ion exchange membranes are rated in the order BPM > AEM > CMM > CEM.

The role of ion exchange membrane in vanadium oxygen fuel cell

2021 ◽  
Vol 629 ◽  
pp. 119271
Author(s):  
Jiří Charvát ◽  
Petr Mazúr ◽  
Martin Paidar ◽  
Jaromír Pocedič ◽  
Jiří Vrána ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Exchange Membrane ◽  
Oxygen Fuel

scholarly journals Evaluation of Electrodialysis Desalination Performance of Novel Bioinspired and Conventional Ion Exchange Membranes with Sodium Chloride Feed Solutions

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 217
Author(s):  
AHM Golam Hyder ◽  
Brian A. Morales ◽  
Malynda A. Cappelle ◽  
Stephen J. Percival ◽  
Leo J. Small ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Current Density ◽  
Feed Solution ◽  
Laboratory Scale ◽  
Cation Exchange Membrane ◽  
Limiting Current ◽  
Ion Exchange Membranes ◽  
Experimental Apparatus ◽  
Exchange Membrane

Electrodialysis (ED) desalination performance of different conventional and laboratory-scale ion exchange membranes (IEMs) has been evaluated by many researchers, but most of these studies used their own sets of experimental parameters such as feed solution compositions and concentrations, superficial velocities of the process streams (diluate, concentrate, and electrode rinse), applied electrical voltages, and types of IEMs. Thus, direct comparison of ED desalination performance of different IEMs is virtually impossible. While the use of different conventional IEMs in ED has been reported, the use of bioinspired ion exchange membrane has not been reported yet. The goal of this study was to evaluate the ED desalination performance differences between novel laboratory‑scale bioinspired IEM and conventional IEMs by determining (i) limiting current density, (ii) current density, (iii) current efficiency, (iv) salinity reduction in diluate stream, (v) normalized specific energy consumption, and (vi) water flux by osmosis as a function of (a) initial concentration of NaCl feed solution (diluate and concentrate streams), (b) superficial velocity of feed solution, and (c) applied stack voltage per cell-pair of membranes. A laboratory‑scale single stage batch-recycle electrodialysis experimental apparatus was assembled with five cell‑pairs of IEMs with an active cross-sectional area of 7.84 cm2. In this study, seven combinations of IEMs (commercial and laboratory-made) were compared: (i) Neosepta AMX/CMX, (ii) PCA PCSA/PCSK, (iii) Fujifilm Type 1 AEM/CEM, (iv) SUEZ AR204SZRA/CR67HMR, (v) Ralex AMH-PES/CMH-PES, (vi) Neosepta AMX/Bare Polycarbonate membrane (Polycarb), and (vii) Neosepta AMX/Sandia novel bioinspired cation exchange membrane (SandiaCEM). ED desalination performance with the Sandia novel bioinspired cation exchange membrane (SandiaCEM) was found to be competitive with commercial Neosepta CMX cation exchange membrane.

scholarly journals Transparent Ion-Exchange Membrane Exhibiting Intense Emission under a Specific pH Condition Based on Polypyridyl Ruthenium(II) Complex with Two Imidazophenanthroline Groups

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 400
Author(s):  
Hajime Kamebuchi ◽  
Satoshi Tamaki ◽  
Atsushi Okazawa ◽  
Norimichi Kojima
Keyword(s):  
Ion Exchange ◽  
Emission Intensity ◽  
Density Functional ◽  
Emission Spectra ◽  
Density Functional Theory Calculations ◽  
Ion Exchange Membrane ◽  
Quantum Yields ◽  
Relative Emission Intensity ◽  
Nafion Film ◽  
Exchange Membrane

The development and the photophysical behavior of a transparent ion-exchange membrane based on a pH-sensitive polypyridyl ruthenium(II) complex, [(bpy)2RuII(H2bpib)RuII(bpy)2](ClO4)4 (bpy = 2,2′-bipyridine, H2bpib = 1,4-bis([1,10]phenanthroline[5,6-d]-imidazol-2-yl)benzene), are experimentally and theoretically reported. The emission spectra of [(bpy)2RuII(H2bpib)RuII(bpy)2]@Nafion film were observed between pH 2 and pH 11 and showed the highest relative emission intensity at pH 5 (λmaxem = 594.4 nm). The relative emission intensity of the film significantly decreased down to 75% at pH 2 and 11 compared to that of pH 5. The quantum yields (Φ) and lifetimes (τ) showed similar correlations with respect to pH, Φ = 0.13 and τ = 1237 ns at pH 5, and Φ = 0.087 and τ = 1014 ns and Φ = 0.069 and τ = 954 ns at pH 2 and pH 11, respectively. These photophysical data are overall considerably superior to those of the solution, with the radiative- (kr) and non-radiative rate constants (knr) at pH 5 estimated to be kr = 1.06 × 105 s−1 and knr = 7.03 × 105 s−1. Density functional theory calculations suggested the contribution of ligand-to-ligand- and intraligand charge transfer to the imidazolium moiety in Ru-H3bpib species, implying that the positive charge on the H3bpib ligand works as a quencher. The Ru-Hbpib species seems to enhance non-radiative deactivation by reducing the energy of the upper-lying metal-centered excited state. These would be responsible for the pH-dependent “off-on-off” emission behavior.

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