Issue 12, 2019

Zirconia nanocomposites with carbon and iron(iii) oxide for voltammetric detection of sub-nanomolar levels of methyl parathion

Abstract

This study reports the synthesis of zirconia nanoparticles loaded on various carbon substrates, namely, reduced graphene oxide (Zr-r-GO), carbon nanotubes (Zr-CNT), and activated carbon (Zr-AC). In addition, a composite of zirconia–iron mixed oxide loaded on activated carbon (FeZr-AC) was also synthesized. The materials were characterized using SEM-EDX, HRTEM, FTIR, Raman spectroscopy, TGA and XRD. The FeZr-AC sample was found to have a nanorod like morphology. The samples were evaluated for their sensing potential towards methyl parathion (MP) using differential pulse voltammetry in a range of 0.0 V to −0.9 V (vs. Ag/AgCl) by drop casting on a glassy carbon electrode (GCE). All the modified GCEs best operated at a working potential of 0.4–0.9 V vs. Ag/AgCl/Cl. FeZr-AC was found have the best limit of detection followed by Zr-AC, Zr-CNT and Zr-r-GO with their detection limits being 1.7 × 10−9 M, 17.2 ×10−9 M, 243.3 × 10−9 M and 534.0 × 10−9 M respectively. These materials were then used to detect MP in spiked sewage samples and showed good recoveries.

Graphical abstract: Zirconia nanocomposites with carbon and iron(iii) oxide for voltammetric detection of sub-nanomolar levels of methyl parathion

  • This article is part of the themed collection: Gas sensing

Supplementary files

Article information

Article type
Paper
Submitted
18 Sept. 2019
Accepted
28 Okt. 2019
First published
29 Okt. 2019
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2019,1, 4947-4954

Zirconia nanocomposites with carbon and iron(III) oxide for voltammetric detection of sub-nanomolar levels of methyl parathion

K. P. Gannavarapu, V. Ganesh and R. B. Dandamudi, Nanoscale Adv., 2019, 1, 4947 DOI: 10.1039/C9NA00589G

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