Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 6, 2019
Previous Article Next Article

A novel sensing layer based on metal–organic framework UiO-66 modified with TiO2–graphene oxide: application to rapid, sensitive and simultaneous determination of paraoxon and chlorpyrifos

Author affiliations

Abstract

In this paper, a novel enzymeless electrochemical sensor with high sensitivity was constructed based on TiO2 functionalized graphene oxide@UiO-66 (TGO@UiO-66) for simultaneous detection of paraoxon and chlorpyrifos. TGO@UiO-66 for electrode modification possesses good conductivity and a distinctive structure, which promotes the electron transfer rate and improves the efficiency of electrochemical sensors. In this work, a TGO@UiO-66 modified glassy carbon electrode (TGO@UiO-66/GCE) was used for simultaneous determination of paraoxon and chlorpyrifos. The square wave voltammogram of TGO@UiO-66/GCE in the presence of paraoxon and chlorpyrifos showed two characteristic cathodic peaks at −0.45 and −1.3 V (vs. Ag/AgCl). Also, excellent electrochemical characteristics of the proposed sensor were evidenced by impedance and cyclic voltammetry studies in a Fe(CN)64−/3− solution. Different experimental parameters such as the type of electrolyte, pH of the electrolyte, and scan rate were optimized, and calibration curves were plotted under the optimal conditions. The designed sensor exhibited low detection limits of 0.2 and 1.0 nM within the linear ranges of 1.0–100.0 nM and 5.0–300.0 nM for paraoxon and chlorpyrifos, respectively. The developed sensor was successfully applied to pesticide residue monitoring in vegetable and water samples.

Graphical abstract: A novel sensing layer based on metal–organic framework UiO-66 modified with TiO2–graphene oxide: application to rapid, sensitive and simultaneous determination of paraoxon and chlorpyrifos

Back to tab navigation

Publication details

The article was received on 08 Dec 2018, accepted on 07 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ06208K
Citation: New J. Chem., 2019,43, 2600-2609

  •   Request permissions

    A novel sensing layer based on metal–organic framework UiO-66 modified with TiO2–graphene oxide: application to rapid, sensitive and simultaneous determination of paraoxon and chlorpyrifos

    N. Karimian, H. Fakhri, S. Amidi, A. Hajian, F. Arduini and H. Bagheri, New J. Chem., 2019, 43, 2600
    DOI: 10.1039/C8NJ06208K

Search articles by author

Spotlight

Advertisements