Title
Polypyrrole membranes containing chelating ligands: synthesis, characterisation and transport studies
Document Type
Journal Article
RIS ID
6575
Abstract
Conducting polymer membranes consisting of polypyrrole (PPy) doped with either 8-hydroxyquinoline-5-sulfonic acid (HQS) or 2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolinedisulfonic acid (bathocuproinedisulfonic acid, (BCS)) were prepared electrochemically using aqueous solutions of pyrrole and the respective chelating ligands. The ratio of pyrrole to dopant in the resulting PPy/HQS and PPy/BCS free-standing membranes was found to be 9:1 and 6:1, respectively, whilst the conductivities were comparable (1.13 and 3.40Scm-1, respectively). Cyclic voltammetry studies using electrodes coated with thin films indicated that both polymers undergo reversible oxidation/reduction processes in aqueous solution that are influenced by the nature of the supporting electrolyte. Electrochemically controlled transport of metal ions was demonstrated using laminated membranes (either PPy/BCS or PPy/HQS was deposited onto platinum sputter-coated polyvinylidene filters). Transport of Co2+, Ni2+ and Zn2+ was demonstrated for the first time across PPy/BCS/Pt/PVDF membranes, which also proved permeable to K+, Mg2+, Ca2+, Mn2+, Fe3+ and Cu2+. By contrast PPy/HQS/Pt/PVDF membranes proved permeable to a smaller number of metal ions under the same conditions, with only K+, Co2+ and Cu2+ transported to a significant extent. The flux of copper across membranes containing PPy/BCS was approximately 10 times greater than that observed using membranes containing PPy/HQS, and 50 times greater than for polypyrrole membranes containing other types of dopants.
This record is in the process of being updated. Please contact us for more information.
Publication Details
Misoska, V., Ding, J., Davey, M., Price, W. E., Ralph, S. F. & Wallace, G. G. (2001). Polypyrrole membranes containing chelating ligands: synthesis, characterisation and transport studies. Polymer, 42 8571-8579.