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Determination of Cd2+ and Pb2+ by polyindole/Mn2O3 nanocomposite and polyindole/Mn2O3/polyaniline nanofibers modified glassy carbon electrode

Azar Yousefi, Hossein Aghaie, Masoud Giahi, and Laleh Maleknia

Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran



Received: 19 February 2022  Accepted: 22 June 2022


In this paper, the surface of the glassy carbon electrode was modified by polyindole (PIN)/Mn2O3 nanocomposite and PIN/Mn2O3/polyaniline (PANI) nanofibers and electrochemical behavior toward the sensing of Cd2+ and Pb2+ was investigated using differential pulse anodic stripping voltammetry. The amount of (PIN)/Mn2O3 nanocomposite was varied to find the best performance. In addition, cyclic voltammetry of ferrocyanide was used to describe the behavior of modified electrodes and the diffusion coefficient for PIN/Mn2O3 and PIN/Mn2O3/PANI samples containing 5%w/w (PIN)/Mn2O3 nanocomposite was 8.05 × 10–7 and 1.29 × 10–6 cm2 s−1, respectively. The synergistic effect of PANI and PIN/Mn2O3 in nanofibers structure enhances the accumulation efficiency and the charge transfer rate of metal ions. Under the optimal conditions, PIN/Mn2O3/PANI nanofibers modified electrode showed good linear relationships for Cd2+ and Pb2+ in a range of 0.05–450 µg L−1, with the detection limit of 0.05 and 0.02 µg L−1 for Pb2+ and Cd2+, respectively. The linear range and detection limit for PIN/Mn2O3 nanocomposite modified electrode was 1–200 µg L−1and 9.85 and 10.72 µg L−1 for Cd2+ and Pb2+, respectively.

Keywords: Heavy metal ions; Polyaniline; Differential pulse anodic stripping voltammetry; Polyindole

Full paper is available at

DOI: 10.1007/s11696-022-02343-5


Chemical Papers 77 (2) 733–743 (2023)

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