Electrochemical sensor based on MWCNTs/Co3O4/SPGE for simultaneous detection of Sudan I and Bisphenol A

Afsaneh Hajializadeh

doi:10.5599/jese.1211

Abstract

This paper presents a sensitive simultaneous detection procedure for Sudan I and bisphenol A based on the multiwalled carbon nanotubes (MWCNTs)/Co3O4 nanocomposite modified screen-printed graphite electrode (SPGE). This MWCNTs/Co3O4 nanocomposite was prepared by the hydrothermal technique, and characterized by Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The electrochemical properties of MWCNTs/Co3O4 nanocomposite modified SPGE were analyzed by cyclic voltammetry (CV), differential pulse voltammetry (DPV), chronoamperometry (CHA), as well as linear sweep voltammetry (LSV). From the electrochemical results, a synergy between MWCNTs and Co3O4 nanoparticles (NPs) was detected as improved interfacial electron transfer, which was accompanied by a greater catalytic function for electrochemical oxidation of Sudan I. Based on the optimized condition, MWCNTs/Co3O4/SPGE exhibited the linear dynamic ranging between 0.05 and 600.0 μM detection of Sudan I with a limit of detection (LOD) 0.02 μM. Also, the as-prepared electrode was assessed for simultaneous detection of Sudan I and Bisphenol A. In the course of electrooxidation processes of these analytes, two complete peaks at 380 and 520 mV were observed on the modified electrode. At the end, utility of this new electrochemical sensor was performed to determine Sudan I and Bisphenol A in some real samples with good accuracy and precision.

Highlights

Sudan I (1-phenylazo-2-naphtol) is a synthetic azo dye commonly employed as one of the coloring materials in industrial products like shoes, textile, oil, plastic, printing ink, cosmetics, as well as floor polish [1]
Considering public health, it would be of high significance to develop a valid analytical procedure to determine BPA. Several analytical methods such as gas chromatography-mass spectrometry (GC–MS) [10], highperformance liquid chromatography (HPLC) [11,12], fluorescence [13], capillary electrophoresis [14], surface-enhanced Raman scattering spectroscopy [15], and chemiluminescence [16,17] have been developed for detecting Bisphenol A and Sudan I
The spectra bands at 2921 cm-1 to 2854 cm-1 are attributed to the asymmetric or symmetric stretching vibrations of C-H in CH2 and –CH3 group in multiwalled carbon nanotubes (MWCNTs)

Summary

Introduction

Sudan I (1-phenylazo-2-naphtol) is a synthetic azo dye commonly employed as one of the coloring materials in industrial products like shoes, textile, oil, plastic, printing ink, cosmetics, as well as floor polish [1]. Considering public health, it would be of high significance to develop a valid analytical procedure to determine BPA Several analytical methods such as gas chromatography-mass spectrometry (GC–MS) [10], highperformance liquid chromatography (HPLC) [11,12], fluorescence [13], capillary electrophoresis [14], surface-enhanced Raman scattering spectroscopy [15], and chemiluminescence [16,17] have been developed for detecting Bisphenol A and Sudan I. These techniques showed good outputs, they might be laborious and demand numerous raw materials, professional workforce, and costly instruments.

Hajializadeh

Results and discussion

Conclusion