Analytical chemistry
Masoumeh Taei; Hossein Salavati; Masoud Fouladgar; Elmira Abbaszadeha
Abstract
The ZnCrFeO4 nanoparticles were synthesized as antiferromagnetic material using sol-gel method. The X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) certified that ZnCrFeO4 nanoparticles have single-phase cubic structure with a range of 50–100 nm in size. A facile and ...
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The ZnCrFeO4 nanoparticles were synthesized as antiferromagnetic material using sol-gel method. The X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) certified that ZnCrFeO4 nanoparticles have single-phase cubic structure with a range of 50–100 nm in size. A facile and sensitive analytical method was developed for simultaneous determination of sunset yellow and tartrazine based on ZnCrFeO4 modified paste electrode. The oxidation responses of sunset yellow and tartrazine are improved extremely at the modified carbon paste electrode (ZnCrFeO4/CPE), exhibiting two well-defined anodic peaks at + 0.70V and +0.99 V vs Ag/AgCl, respectively. The oxidation reactions were controlled by diffusion step for tartrazine and adsorption step for sunset yellow. Simultaneous determination of these dyes indicated wide linear ranges from 0.07 to 47.5, and 0.05 to 19.0 μmol L−1 with detection limits of 2.0 and 10.0 nmol L−1 for sunset yellow and tartrazine, respectively. The results of real samples analyses affirmed that ZnCrFeO4/CPE possess remarkable potential to determine simultaneously sunset yellow and tartrazine in soft drinks samples.
Foroozan Hasanpour; Masoumeh Taei; Masoud Fouladgar; Mehdi Salehi
Abstract
In this study, Nd-doped cobalt oxide (Nd-Co3O4) nanoparticles were prepared by a combustion synthesis procedure using Co(acac)3 complex. The nanoparticles were characterized by infrared spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy ...
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In this study, Nd-doped cobalt oxide (Nd-Co3O4) nanoparticles were prepared by a combustion synthesis procedure using Co(acac)3 complex. The nanoparticles were characterized by infrared spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Then, the effect of Nd-Co3O4 on the electrocatalytic activity of gold nanodendrites (AuNDs) electrodeposited on a glassy carbon electrode (GCE) for ethanol oxidation was studied. The results showed that the Nd-Co3O4/AuNDs/GCE presents higher active surface area and current density (about 2 times) for the ethanol oxidation compared with the AuNDs/GCE. Cyclic voltammetry and chrono-potentiometry methods proved that the Nd-Co3O4/AuNDs/GCE is able to increase a long-term stability of electrode in alkaline ethanol fuel cell by providing OHads species at the surface of the catalysts. Consequently, the Nd-Co3O4/AuNDs/GCE, as an anodic electrode, reveals potent catalytic activity for ethanol oxidation in alkaline media.