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Sensors 2016, 16(7), 1106; doi:10.3390/s16071106

Influence of Ionic Liquids on the Selectivity of Ion Exchange-Based Polymer Membrane Sensing Layers

1
Lennard-Jones Laboratories, Birchall Centre, Keele University, Keele, Staffordshire ST5 5BG, UK
2
School of Chemical & Pharmaceutical Sciences, Dublin Institute of Technology, Kevin Street, Dublin 2, Ireland
*
Author to whom correspondence should be addressed.
Academic Editors: Xiangqun Zeng, Michael T. Carter and Abdul Rehman
Received: 17 May 2016 / Revised: 8 July 2016 / Accepted: 14 July 2016 / Published: 16 July 2016
(This article belongs to the Special Issue Ionic Liquids)
View Full-Text   |   Download PDF [1509 KB, uploaded 18 July 2016]   |  

Abstract

The applicability of ion exchange membranes is mainly defined by their permselectivity towards specific ions. For instance, the needed selectivity can be sought by modifying some of the components required for the preparation of such membranes. In this study, a new class of materials –trihexyl(tetradecyl)phosphonium based ionic liquids (ILs) were used to modify the properties of ion exchange membranes. We determined selectivity coefficients for iodide as model ion utilizing six phosphonium-based ILs and compared the selectivity with two classical plasticizers. The dielectric properties of membranes plasticized with ionic liquids and their response characteristics towards ten different anions were investigated using potentiometric and impedance measurements. In this large set of data, deviations of obtained selectivity coefficients from the well-established Hofmeister series were observed on many occasions thus indicating a multitude of applications for these ion-exchanging systems. View Full-Text
Keywords: ion-exchange membrane; ionic liquids; potentiometric sensors; selectivity ion-exchange membrane; ionic liquids; potentiometric sensors; selectivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mendecki, L.; Callan, N.; Ahern, M.; Schazmann, B.; Radu, A. Influence of Ionic Liquids on the Selectivity of Ion Exchange-Based Polymer Membrane Sensing Layers. Sensors 2016, 16, 1106.

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