Abstract
BackgroundA simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection of dihydroxy benzene isomers.MethodsThe modified working electrode was characterized by electrochemical and field emission scanning electron microscopy methods. The modified electrode showed excellent electrocatalytic activity for the electrooxidation of catechol (CC) and hydroquinone (HQ) at physiological pH of 7.4 by cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques.ResultsThe effective split in the overlapped oxidation signal of CC and HQ was achieved in a binary mixture with peak to peak separation of 0.102 V and 0.103 V by CV and DPV techniques. The electrode kinetics was found to be adsorption-controlled. The oxidation potential directly depends on the pH of the buffer solution, and it witnessed the transfer of equal number of protons and electrons in the redox phenomenon.ConclusionsThe limit of detection (LOD) for CC and HQ was calculated to be 0.126 μM and 0.132 μM in the linear range of 0 to 80.0 μM and 0 to 110.0 μM, respectively, by ultra-sensitive DPV technique. The practical applicability of the proposed sensor was evaluated for tap water sample analysis, and good recovery rates were observed.Graphical abstractElectrocatalytic interaction of ALR/GCE with dihydroxy benzene isomers.
Highlights
A simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection of dihydroxy benzene isomers
We reported the modification procedure for the GCE by simple electropolymerization of ALR by cyclic voltammetric (CV) technique in a basic supporting electrolyte solution
In order to boost the performance of the bare GCE, electropolymerization of allura red was carried out on the glassy carbon working electrode by preparing 1.0 mM aqueous solution of ALR monomer along with 0.1 M NaOH solution as a supporting electrolyte
Summary
A simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection of dihydroxy benzene isomers. Catechol (CC) and hydroquinone (HQ) are the isomers of dihydroxy benzene, which are widely used in paint, leather, pharmaceutical, pesticide, cosmetic and plastic industries, and obviously, the effluent from these manufacturing industries contain traces of CC and HQ which in turn become toxic to human and animals (Wang et al 2007a, 2007b, 2007c; Kumar et al 2017). Due to this these, molecules were recognized as an ecological hazard (He et al 2014). The drawback of using traditional spectroscopic methods for their determination is tedious and not consistent (Chao & Suatoni, 1982; Nagaraja et al 2001; Sun et al 2000; Mesa & Mateos, 2007)
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