Effect of current density, concentration of ternary electrolyte and type of cations on the monovalent ion selectivity of surface-sulfonated anion-exchange membranes: Modelling and experiment

2021 ◽  
pp. 119466
Author(s):  
D.V. Golubenko ◽  
A.B. Yaroslavtsev
Keyword(s):  
Anion Exchange ◽  
Current Density ◽  
Ion Selectivity ◽  
Anion Exchange Membranes ◽  
Density Concentration ◽  
Monovalent Ion

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 Nitrate-Selective Anion Exchange Membranes Prepared using Discarded Reverse Osmosis Membranes as Support

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 377
Author(s):  
Amaia Lejarazu-Larrañaga ◽  
Juan Manuel Ortiz ◽  
Serena Molina ◽  
Yan Zhao ◽  
Eloy García-Calvo
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Reverse Osmosis ◽  
Current Density ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Transport Numbers ◽  
Anion Exchange Membranes ◽  
Filtration Membrane ◽  
Reverse Osmosis Membranes

The present work shows a methodology for the preparation of membranes with a high affinity for nitrates. For this purpose, a polymeric mixture containing an anion exchange resin was extended on a recycled pressure filtration membrane used as mechanical support. Different ion exchange resins were tested. The influence in ion fractionation of (i) the type of ion exchange resin, (ii) the use of a recycled membrane as support and (iii) the operating current density during the separation process were studied. Results revealed that the employed anion exchange resin could tune up the transport numbers of the anions in the membrane and enhance the transport of nitrates over sulfates. The use of the recycled filtration membrane as support further increased the transport of nitrates in detriment of sulfates in nitrate-selective membranes. Moreover, it considerably improved the mechanical stability of the membranes. Lowering the operational current density also boosted ion fractionation. In addition, the use of recycled membranes as support in membrane preparation is presented as an alternative management route of discarded reverse osmosis membranes, coupling with the challenging management of waste generated by the desalination industry. These membranes could be used for nitrate recovery from wastewater or for nitrate separation from groundwater.

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.

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.

Polymeric materials as anion-exchange membranes for alkaline fuel cells

2011 ◽  
Vol 36 (11) ◽  
pp. 1521-1557 ◽  
Author(s):  
Guillaume Couture ◽  
Ali Alaaeddine ◽  
Frédéric Boschet ◽  
Bruno Ameduri
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Polymeric Materials ◽  
Anion Exchange Membranes ◽  
Alkaline Fuel Cells

High‐capacity multimodal anion‐exchange membranes for polishing of therapeutic proteins

2021 ◽  
Author(s):  
Joshua Osuofa ◽  
Daniel Henn ◽  
Jinxiang Zhou ◽  
Anna Forsyth ◽  
Scott M. Husson
Keyword(s):  
Anion Exchange ◽  
Therapeutic Proteins ◽  
High Capacity ◽  
Anion Exchange Membranes
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