%0 Journal Article
%T Synthesis and characterization of LaMnO3 nanocrystals and
graphene oxide: fabrication of graphene oxide¨CLaMnO3 sensor
for simultaneous electrochemical determination of
hydroquinone and catechol
%A Akbari
%A Sedighe
%A Foroughi
%A Mohammad Mehdi
%A Jahani
%A Shohreh
%A Nadiki
%A Hadi Hassani
%J -
%D 2019
%R 10.5599/jese.634
%X Sa£¿etak 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¨C433.3 and 0.5¨C460.0 ¦ÌM with sensitivity of 0.0719 and 0.0712 ¦ÌA ¦ÌM-1 , respectively. The detection limits for HQ and CT are determined as 0.06 and 0.05 ¦ÌM, respectively
%K Catechol
%K hydroquinone
%K graphene oxide
%K LaMnO3 nanoparticles
%K voltammetry
%U https://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=325742