Study of monovalent ion selectivity of anion-exchange membranes: effect of surface modification and applied voltage

2017 ◽  
Vol 75 ◽  
pp. 284-292 ◽  
Author(s):  
Kristýna Weinertová ◽  
David Neděla ◽  
Eliška Stránská ◽  
Jan Křivčík
Keyword(s):  
Surface Modification ◽  
Anion Exchange ◽  
Applied Voltage ◽  
Ion Selectivity ◽  
Anion Exchange Membranes ◽  
Monovalent Ion ◽  
Effect Of Surface

scholarly journals Preparation of Two-Layer Anion-Exchange Poly(ethersulfone) Based Membrane: Effect of Surface Modification

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lucie Zarybnicka ◽  
Eliska Stranska ◽  
Jana Machotova ◽  
Gabriela Lencova
Keyword(s):  
Surface Layer ◽  
Surface Modification ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Exchange Capacity ◽  
Sem Analysis ◽  
Electrochemical Characteristics ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Effect Of Surface

The present work deals with the surface modification of a commercial microfiltration poly(ethersulfone) membrane by graft polymerization technique. Poly(styrene-co-divinylbenzene-co-4-vinylbenzylchloride) surface layer was covalently attached onto the poly(ethersulfone) support layer to improve the membrane electrochemical properties. Followed by amination, a two-layer anion-exchange membrane was prepared. The effect of surface layer treatment using the extraction in various solvents on membrane morphological and electrochemical characteristics was studied. The membranes were tested from the point of view of water content, ion-exchange capacity, specific resistance, permselectivity, FT-IR spectroscopy, and SEM analysis. It was found that the two-layer anion-exchange membranes after the extraction using tetrahydrofuran or toluene exhibited smooth and porous surface layer, which resulted in improved ion-exchange capacity, electrical resistance, and permselectivity of the membranes.

Effect of Surface Modification of Heterogeneous Anion-Exchange Membranes on the Intensity of Electroconvection at Their Surfaces

2019 ◽  
Vol 55 (12) ◽  
pp. 1203-1220 ◽  
Author(s):  
N. D. Pismenskaya ◽  
S. A. Mareev ◽  
E. V. Pokhidnya ◽  
C. Larchet ◽  
L. Dammak ◽  
...  
Keyword(s):  
Surface Modification ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Effect Of Surface

scholarly journals Study of Polyaniline/Poly(Sodium 4-Styrenesulfonate) Composite Deposits Using an Electrochemical Quartz Crystal Microbalance for the Modification of a Commercial Anion Exchange Membrane

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 387
Author(s):  
Antonio Montes-Rojas ◽  
Marlen Ramírez-Orizaga ◽  
Jesús Gerardo Ávila-Rodríguez ◽  
Luz María Torres-Rodríguez
Keyword(s):  
Anion Exchange ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Ion Selectivity ◽  
Chemical Species ◽  
Special Property ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Anion Exchange Membranes ◽  
The Matrix ◽  
Composite Deposits

One of the intended applications for the modification of ion exchange membranes with polyaniline (PAni) is to use it as a matrix to include chemical species that confer a special property such as resistance to fouling or ion selectivity. In particular, the inclusion of polyelectrolyte molecules into the PAni matrix appears to be the way to modulate these properties of selective membranes. Therefore, it must be clearly understood how the polyelectrolyte is incorporated into the matrix of polyaniline. Among the results obtained in this paper using poly(sodium 4-styrenesulfonate) (PSS) and an electrochemical quartz crystal microbalance, the amount of polyelectrolyte incorporated into PAni is found to be proportional to the PSS concentration in solution if its value is between 0 and 20 mM, while it reaches a maximum value when the PSS in solution is greater than 20 mM. When the anion exchange membranes are modified with these composite deposits, the transport number of chloride was found to decrease progressively (when the PSS concentration in solution is between 0 and 20 mM) to reach a practically constant value when a concentration of PSS greater than 20 mM was used.

Effect of Surface Ion Conductivity of Anion Exchange Membranes on Fuel Cell Performance

Langmuir ◽  
2016 ◽  
Vol 32 (37) ◽  
pp. 9557-9565 ◽  
Author(s):  
Masanori Hara ◽  
Taro Kimura ◽  
Takuya Nakamura ◽  
Manai Shimada ◽  
Hideaki Ono ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Anion Exchange ◽  
Ion Conductivity ◽  
Cell Performance ◽  
Anion Exchange Membranes ◽  
Fuel Cell Performance ◽  
Effect Of Surface

STABILITY AND PERFORMANCE EVALUATION OF ION-EXCHANGE MEMBRANES FOR VANADIUM REDOX FLOW BATTERY

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
Saidatul Sophia Sha’rani ◽  
Ebrahim Abouzari Lotf ◽  
Arshad Ahmad ◽  
Wan Atika Wan Ibrahim ◽  
Mohamed Mahmoud El-sayed Nasef ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Chemical Stability ◽  
Ion Selectivity ◽  
Vanadium Redox Flow Battery ◽  
Anion Exchange Membranes ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Exchange Membrane ◽  
Vanadium Redox

The performance of vanadium redox flow battery (VRFB) is highly dependent on the efficiency of the membrane. Generally, anion exchange membranes and cation exchange membranes can be applied in the VRFB. In this paperwork, AMI-7001S anion exchange membrane and CMI-7000S cation exchange membranes were tested for their suitability in the VRFB application. Both of the membranes were originally used for electrocoat and water treatment system. In order to study the behavior of the membranes in the VRFB, several tests were performed. This includes VO2+ ion permeability, ionic conductivity, ion selectivity, chemical stability and single cell performance. The results obtained were compared to Nafion 117 which is a proton exchange membrane. This membrane is one of the most established membranes for VRFB. From the experiment, it can be summarized that the membranes are unsuitable to be used in VRFB. This is due to the low ion selectivity, poor chemical stability and high resistance.

scholarly journals Characterization of Poly(Acrylic) Acid-Modified Heterogenous Anion Exchange Membranes with Improved Monovalent Permselectivity for RED

Membranes ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 134 ◽  
Author(s):  
Ivan Merino-Garcia ◽  
Francis Kotoka ◽  
Carla A.M. Portugal ◽  
João G. Crespo ◽  
Svetlozar Velizarov
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Acrylic Acid ◽  
Anion Exchange ◽  
Electrochemical Impedance ◽  
Process Efficiency ◽  
Anion Exchange Membranes ◽  
Reverse Electrodialysis ◽  
Modification Procedure ◽  
Poly Acrylic Acid

The performance of anion-exchange membranes (AEMs) in Reverse Electrodialysis is hampered by both presence of multivalent ions and fouling phenomena, thus leading to reduced net power density. Therefore, we propose a monolayer surface modification procedure to functionalize Ralex-AEMs with poly(acrylic) acid (PAA) in order to (i) render a monovalent permselectivity, and (ii) minimize organic fouling. Membrane surface modification was carried out by putting heterogeneous AEMs in contact with a PAA-based aqueous solution for 24 h. The resulting modified membranes were firstly characterized by contact angle, water uptake, ion exchange capacity, fixed charge density, and swelling degree measurements, whereas their electrochemical responses were evaluated through cyclic voltammetry. Besides, their membrane electro-resistance was also studied via electrochemical impedance spectroscopy analyses. Finally, membrane permselectivity and fouling behavior in the presence of humic acid were evaluated through mass transport experiments using model NaCl containing solutions. The use of modified PAA-AEMs resulted in a significantly enhanced monovalent permselectivity (sulfate rejection improved by >35%) and membrane hydrophilicity (contact angle decreased by >15%) in comparison with the behavior of unmodified Ralex-AEMs, without compromising the membrane electro-resistance after modification, thus demonstrating the technical feasibility of the proposed membrane modification procedure. This study may therefore provide a feasible way for achieving an improved Reverse Electrodialysis process efficiency.

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