Multiwall carbon nanotube modified by antimony oxide (Sb2O3/MWCNTs) paste electrode for the simultaneous electrochemical detection of cadmium and lead ions

Tran Le Hai, Ly Cam Hung, Tran Thi Bich Phuong, Bui Thi Thu Ha, Ba Son Nguyen, Tran Duy Hai, Van Huy Nguyen

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Abstract

In this study, a sensitive and reliable anodic stripping voltammetry (ASV) using a series of multiwall carbon nanotube modified by antimony oxide (Sb2O3/MWCNTs) paste electrodes was successfully introduced for the simultaneous electrochemical detection of Cd2+ and Pb2+ ions. Firstly, a composite of multiwall carbon nanotubes (MWCNTs) was successfully used to preparing a paste electrode. Then, the MWCNTs bulk electrode was further modified with various concentrations of Sb2O3 (1, 3, and 4 wt.%, respectively) for improving the cadmium ions (Cd2+) and lead ions (Pb2+) detection ability. Among the Sb2O3/MWCNTs electrodes, the modified electrode by 3 wt.% Sb2O3 exhibits remarkable analytical detection for Cd2+ and Pb2+ by linear sweep anodic stripping voltammetry (LSASV) technique. The proper linear curves of current response versus the concentration of Cd2+ (80–150 ppb) and Pb2+ (5–35 ppb) could be observed. Interestingly, the analytical sensitivity of the mixture Cd2+ and Pb2+ were 1.932 and 2.694 μA⋅L⋅μg–1, respectively, which were higher than 1.5 and 1.3 folds of the individual ions. It expects that the Sb2O3/MWCNTs paste electrode could provide a significant improvement to the electrode for the simultaneous electrochemical detection of Cd2+ and Pb2+ ions.

Original languageEnglish
Article number104456
JournalMicrochemical Journal
DOIs
Publication statusAccepted/In press - 2019 Jan 1

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Spectroscopy

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