Electrocatalytic determination of methyl orange dye using mechanically alloyed novel metallic glass modified carbon paste electrode by cyclic voltammetry

Abstract

Metallic glasses (MG) are nano-structured alloys with extraordinary electrical conductivity and applications. Therefore, in the present article, we have fabricated a metallic glass-modified carbon paste electrode (MG-MCPE) to determine methyl orange (MO) dye at a pH of 6.4 using a cyclic voltammetric technique. MO is an azo dye commonly used in textile, paper, and food industries and has an adverse effect on human health. Detection of MO in wastewater is important and our MG-MCPE could detect the MO with an excellent current response. The MG of composition 23Fe-21Cr-18Ni-20Ti-18Mn powders was prepared by ball milling them for 15 h. The morphology of nano-structured MG powders, bare carbon paste electrode (BCPE), and MG-MCPE were investigated by scanning electron microscope (SEM) and a high-resolution transmission electron microscope (HR-TEM). We have studied the effect of metallic glass concentration in determining the 1 mM MO and found that 6 mg MG-MCPE depicts the maximum current response compared to 0, 2, 4, 8, 10, and 12 mg MG-MCPE respectively. We investigated the outcome of MO concentration, scan rate, and pH on the electrochemical oxidation of MO and reported that MO oxidizes at 700 mV. We have also calculated the electrode surface area of BCPE and 6 mg MGMCPE by Randles-Sevcik equation and the value was found to be 0.0546 and 0.4439 cm2 respectively. The LD value for the detection of MO using 6 mg MG-MCPE was found to be 0.080 & mu;M. The main aim of the article is to showcase the excellent electrochemical sensor properties of alloys like nano-structured MG powders prepared by mechanical alloying method.