Skoči na glavni sadržaj

Journal of Electrochemical Science and Engineering, Vol. 9 No. 4, 2019.

Izvorni znanstveni članak

https://doi.org/10.5599/jese.634

Synthesis and characterization of LaMnO3 nanocrystals and graphene oxide: fabrication of graphene oxide–LaMnO3 sensor for simultaneous electrochemical determination of hydroquinone and catechol

Sedighe Akbari ; Department Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
Mohammad Mehdi Foroughi ; Department Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
Hadi Hassani Nadiki ; Department Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
Shohreh Jahani ; NanoBioElectrochemistry Research Center, Bam University of Medical Sciences, Bam, Iran

Puni tekst: engleski pdf 788 Kb

str. 255-267

preuzimanja: 390

citiraj

Sažetak

For the first time, a new method for preparation of graphene oxide LaMnO3 (GO-LaMnO3) nanocomposite as a material of electrochemical sensor for simultaneous determination of catechol (CT) and hydroquinone (HQ) is developed. LaMnO3 nanoparticles have been characterized by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) technique. Due to the excellent catalytic activity, enhanced electrical conductivity and high surface area, the simultaneous determination of HQ and CT with two well-defined peaks has been achieved at the GO-LaMnO3 modified electrode. Comparing with unmodified electrodes, the oxidation currents of HQ and CT increased remarkably. Also, the result exhibited a great decrease in anodic overpotential resulting in about 150 mV negative shift of potential. The catalytic peak current values are found linearly dependent on the HQ and CT concentrations in the range of 0.5–433.3 and 0.5–460.0 μM with sensitivity of 0.0719 and 0.0712 μA μM-1 , respectively. The detection limits for HQ and CT are determined as 0.06 and 0.05 μM, respectively.

Ključne riječi

Catechol; hydroquinone; graphene oxide; LaMnO3 nanoparticles; voltammetry

Hrčak ID:

223246

URI

https://hrcak.srce.hr/223246

Datum izdavanja:

22.7.2019.

Posjeta: 1.043 *