Highly sensitive and selective amperometric sensor for iodate based on 9,10-phenanthrenequinone derived graphene

Abstract

We reported on a new amperometric sensor for the sensitive and selective determination of iodate in table salt. The iodate sensor was constructed by the integration of a novel nanocomposite which was made from 9,10-phenanthrenequinone(PQ) and graphene(GP) with a glassy carbon electrode(GCE). The synthesized graphene and the nanocomposite were well characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), Fourier transform infrared(FTIR) spectroscopy and Raman spectroscopy. We fully studied the electrochemical behavior and kinetic characteristics of the PQ/GP nanocomposite at GCE. The PQ/GP electrode shows a good electrochemical catalytic activity towards the reduction of iodate, which makes itself a sensitive and selective electrochemical sensor for iodate. The iodate sensor displays a high sensitivity(1.04 μA·μmol·L⁻¹), a low detection limit(1.0×10⁻⁸ mol/L), a rapid response(less than 2 s), and a broad linear range(from 5.0×10⁻⁸ mol/L to 6.0×10⁻³ mol/L). In addition, the sensor is interference free. The practical application of the proposed sensor was tested by the detection of iodate in table salt.

Keywords

9,10-Phenanthrenequinone / Graphene / Amperometric sensor / Iodate

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