Porous Electrodes Supported on Ion-Exchange Membranes as Electrochemical Detectors for Supercritical Fluid Chromatography

2004 ◽  
Vol 76 (7) ◽  
pp. 2133-2137 ◽  
Author(s):  
Rosanna Toniolo ◽  
Nicola Comisso ◽  
Gilberto Schiavon ◽  
Gino Bontempelli
Keyword(s):  
Ion Exchange ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Porous Electrodes ◽  
Ion Exchange Membranes

scholarly journals Assembly of Soft Electrodes and Ion Exchange Membranes for Capacitive Deionization

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1556 ◽  
Author(s):  
Silvia Ahualli ◽  
Sergio Orozco-Barrera ◽  
María del Mar Fernández ◽  
Ángel V. Delgado ◽  
Guillermo R. Iglesias
Keyword(s):  
Ion Exchange ◽  
Porous Electrodes ◽  
Ion Exchange Membranes ◽  
Capacitive Deionization ◽  
Purification Process ◽  
Electrode Surfaces ◽  
Covered Electrodes ◽  
Kinetics Of ◽  
Highly Porous ◽  
Layer Concept

The responsible use of water, as well as its reuse and purification, has been a major problem for decades now. In this work, we study a method for adsorbing ions from aqueous solutions on charged interfaces using highly porous electrodes. This water purification process is based on the electric double layer concept, using the method known as capacitive deionization (CDI): If we pump salty solutions through the volume comprised between two porous electrodes while applying a potential difference to them, ions present in the solution are partially removed and trapped on the electrode surfaces. It has been well established that the use of carbon electrodes in combination with ion exchange membranes (membrane-CDI) improves the efficiency of the method above that achieved with bare activated carbon. Another approach that has been tested is based on coating the carbon with polyelectrolyte layers, converting them into “soft electrodes” (SEs). Here we investigate the improvement found when combining SEs with membranes, and it is shown that the amount of ions adsorbed and the ratio between ions removed and electrons transported reach superior values, also associated with a faster kinetics of the process. The method is applied to the partial desalination of up to 100 mM NaCl solutions, something hardly achievable with bare or membrane-covered electrodes. A theoretical model is presented for the ion transport in the presence of both the membrane and the polyelectrolyte coating.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Generic Enhanced Sub/Supercritical Fluid Chromatography: Blueprint for Highly Productive and Sustainable Separation of Primary Hindered Amines

2020 ◽  
Vol 8 (15) ◽  
pp. 6011-6021 ◽  
Author(s):  
Jimmy Oliveira DaSilva ◽  
Dan Lehnherr ◽  
Jinchu Liu ◽  
Raffeal Bennett ◽  
Imad A. Haidar Ahmad ◽  
...  
Keyword(s):  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Hindered Amines

Interpolymer ion exchange membranes for CapMix process

Desalination ◽  
2020 ◽  
Vol 482 ◽  
pp. 114384
Author(s):  
Katarzyna Smolinska-Kempisty ◽  
Anna Siekierka ◽  
Marek Bryjak
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membranes
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