Conducting polymers exhibit ion exchanger properties evoked by charging and
discharging processes. The ion-exchange behaviour of electrochemically and
chemically prepared polypyrrole (PPy) was investigated using electrochemic
al quartz crystal microbalance (EQCM) and ion-selective electrodes. An ion-
exchanger electrode was prepared and tested in a laboratory loop considerin
g the application of Pqr as an electrochemically switchable ion-exchanger f
or water treatment.