Diazonium-induced anchoring process: an application to improve the monovalent selectivity of cation exchange membranes
- 9 March 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 20 (18), 3750-3757
- https://doi.org/10.1039/b918915g
Abstract
An efficient and one-step chemical process (diazonium-induced anchoring process) to graft covalently a thin polyaniline-like layer on the surface of the Selemion CMV commercial cation exchange membrane is reported. SEM, IR and XPS techniques were used to characterize the obtained polymer film. The ability of such a surface modification layer to improve the membrane selectivity for hydrogen ions was confirmed by means of electrodialysis test. In contact with a mixed solution of sulfuric acid and metallic divalent salts, the protonation reaction of the polyaniline-like layer creates positive charges, thus leading to an electrical repulsion barrier which may reduce the penetration of divalent cations with respect to hydrogen ions. The ion exchange capacity, the membrane conductivity as well as the competitive transport of nickel and proton ions inside the modified membrane are discussed in detail in comparison with those of the bare membrane.Keywords
This publication has 36 references indexed in Scilit:
- Covalent grafting onto self-adhesive surfaces based on aryldiazonium salt seed layersJournal of Materials Chemistry, 2008
- Grafting Polymers on Surfaces: A New Powerful and Versatile Diazonium Salt-Based One-Step Process in Aqueous MediaChemistry of Materials, 2007
- Electrochemical modification of cation exchange membrane with polyaniline for improvement in permselectivityElectrochimica Acta, 2007
- Characterisation of Nafion®117 membrane modified chemically with a conducting polymer: An application to the demineralisation of sodium iodide organic solutionsSeparation and Purification Technology, 2007
- Properties of CMV cation exchange membranes in sulfuric acid mediaJournal of Membrane Science, 2006
- Preparation and characterization of mono-valent ion selective polypyrrole composite ion-exchange membranesJournal of Membrane Science, 2006
- Chemical Polymerization of Aniline on a Poly(styrene sulfonic acid) Membrane: Controlling the Polymerization Site Using Different OxidantsThe Journal of Physical Chemistry B, 2005
- Separation of H+/Cu2+ cations by electrodialysis using modified proton conducting membranesJournal of Membrane Science, 2003
- Characterization of a Cation-Exchange/Polyaniline Composite MembraneLangmuir, 2003
- Chemical Modification of a Sulfonated Membrane with a Cationic Polyaniline Layer to Improve its PermselectivityElectrochemical and Solid-State Letters, 2002