1 research outputs found
Electrospun Carbon Nanofiber Modified Electrodes for Stripping Voltammetry
Electrospun
polyacrylonitrile (PAN) based carbon nanofibers (CNFs)
have attracted intense attention due to their easy processing, high
carbon yield, and robust mechanical properties. In this work, a CNF
modified glassy carbon (GC) electrode that was coated with Nafion
polymer was evaluated as a new electrode material for the simultaneous
determination of trace levels of heavy metal ions by anodic stripping
voltammetry (ASV). Pb<sup>2+</sup> and Cd<sup>2+</sup> were used as
a representative system for this initial study. Well-defined stripping
voltammograms were obtained when Pb<sup>2+</sup> and Cd<sup>2+</sup> were determined individually and then simultaneously in a mixture.
Compared to a bare GC electrode, the CNF/Nafion modified GC (CNF/Nafion/GC)
electrode improved the sensitivity for lead detection by 8-fold. The
interface properties of the CNF/Nafion/GC were characterized by electrochemical
impedance spectroscopy (EIS), which showed the importance of the ratio
of CNF/Nafion on electrode performance. Under optimized conditions,
the detection limits are 0.9 and 1.5 nM for Pb<sup>2+</sup> and Cd<sup>2+</sup>, respectively