Electrochemical Sensor for Ethylene Glycol using Reduced Graphene Oxide/AuNp/Ni(OH)2 Modified Glassy Carbon Electrode

Abstract

An electrochemical sensor based on a modified glassy carbon electrode (GCE) with reduced graphene oxide and Ni-Au nanoparticles (Ni(OH) 2 /AuNp/rGO/GCE) was developed for the determination of ethylene glycol. The graphene oxide was reduced electrochemically at the electrode surface by chronoamperometry, the gold nanoparticles were deposited by chronopotentiometry while the nickel hydroxide nanoparticles were deposited by cyclic voltammetry. The characterization of graphene oxide was performed by Raman spectroscopy, X-ray diffraction (XRD) and transmission-mode scanning electron microscopy (TSEM), while the modified electrodes were characterized by scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS) analysis. The determination of ethylene glycol was performed by cyclic voltammetry due to the regeneration of the active sites, preventing loss of the sensor signal. The modified GCE with rGO and Ni(OH) 2 /AuNp showed a good performance obtaining a linear range of 0.24 to 1.4 mmol L -1 with a correlation coefficient of 0.9903, limits of detection and quantification (49 and 162 µmol L -1 , respectively) and high stability with 500 continuous analysis cycles.

Prominent ethylene glycol sensing of sol-gel derived ZnO and ZnO:Cu nano-structures

“…It is broadly applied in numerous industries such as petroleum, oil, paint, textile, plastic, and even road industry for its chemical features. Despite its undeniable uses, from the point of view of environment and human health, its excessive use may have risks [1][2][3][4]. Alcoholic compounds can penetrate in water and soil and cause to pollution of groundwater.…”

High Response of ZIF-8-Derived ZnO Nanorods to Low-Concentration Ethylene Glycol

“…This emphasis on detecting low-concentration, targeted gases has become the central focus of gas sensor research. Ethylene glycol is a commonly used industrial raw material with various physical and chemical properties such as being colorless, odorless, and possessing a low volatility point, low combustibility, and excellent flash point. − It finds applications in synthetic fibers, surfactants, and antifreeze. In elevated-temperature settings, the hydroxyl group of ethylene glycol may undergo oxidation, transforming into glycolic acid and subsequently to oxalic acid.…”