Electrically controllable perchlorate removal based on poly(aniline‐co‐o‐aminophenol) doped with p‐toluene sulfonate

Abstract

Poly(aniline-co-o-aminophenol) (PANOA) was synthesized via electrochemical copolymerization of o-aminophenol and aniline using p-toluene sulfonate (TSA 2 ) as the counterion. The redox transformation of PANOA is accompanied by the exchange of anions into and out of the copolymer, and the feasibility of perchlorate (ClO 4 2 ) removal via an electrically switched ion exchange process was evaluated in this study. The results of electrochemical quartz crystal microbalance (EQCM), electrochemical impedance spectroscopy (EIS), and Fourier transform infrared spectroscopy (FTIR) demonstrated the successful release of TSA 2 upon reduction and uptake of ClO 4 2 upon reoxidation of the copolymer. Also, in this work, the possible ion-exchange mechanism of PANOA wasproposed.

Deactivation of poly(o-aminophenol) film electrodes by storage without use in the supporting electrolyte solution and its comparison with other deactivation processes. A study employing EIS

“…Poly(o-aminophenol) synthesized in acidic medium is found to be a useful material to build electrochemical sensors and electrocatalysts [6][7][8][9]. Also, the copolymer of aniline and o-aminophenol poly(aniline-co-oaminophenol)has been synthesized [10] and applied for different purposes, e.g., to develop an electrically controlled anion exchange process to remove perchlorate from industrial wastewaters [11,12] and for electrocatalytic oxidation and reduction [13,14]. Considering the interesting applications of POAP, where the polymer is subjected to rugged conditions (prolonged potential cycling (PPC), potential range, storage conditions, etc.)…”