Application of a Polypyrrole/Carboxy Methyl Cellulose Ion Imprinted Polymer in the Electrochemical Detection of Mercury in Water

Tarisai Velempini, Kriveshini Pillay, Xavier Y. Mbianda, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Sulphur containing carboxy methyl ion imprinted polymers (S-IIPs) were applied as an electrode modifier for the electrochemical detection of Hg(II). A bare glassy carbon electrode (GCE) was modified by electro-polymerizing a layer of pyrrole and then drop coating with S-IIPs. The bare GCE, GCE/polypyrrole (GCE/PPy), GCE/polyprrole/non-ion imprinted polymers (GCE/PPy/NIPs) and the GCE/polypyrrole/sulphur ion imprinted polymers (GCE/PPy/S-IIPs) electrodes were characterised with Fourier Transmission Infrared (FTIR) and electrochemical impendence spectroscopy (EIS). The square wave anodic stripping voltammetry (SWASV) optimised conditions for the GCE/PPy/S-IIPs were: a pH of 3, deposition potential of −1.0 V, pre-concentration time of 60 s and 0.1 M HCl supporting electrolyte. The developed ion imprinted polymer electrochemical sensor was applied in the detection of Hg(II) in water. A detection limit of 0.1 μg L−1 was calculated within a concentration range of 20–800 μg L−1. The sensor was selective in the presence of interfering ions and method was validated with inductively coupled plasma-optical emission spectrometry (ICP-OES) using real water and standard water samples.

Original languageEnglish
Pages (from-to)2612-2619
Number of pages8
JournalElectroanalysis
Volume30
Issue number11
DOIs
Publication statusPublished - Nov 2018

Keywords

  • Ion-imprinted polymer
  • Mercury
  • electrochemical detection
  • polypyrrole
  • square-wave anodic stripping voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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