Graphene Oxide Electroreduced onto Boron-Doped Diamond and Electrodecorated with Silver (Ag/GO/BDD) Electrode for Tetracycline Detection in Aqueous Solution

Sorina Negrea; Lidia Ani Diaconu; Valeria Nicorescu; Sorina Motoc M Ilies; Corina Orha; Florica Manea

doi:10.3390/nano11061566

Graphene Oxide Electroreduced onto Boron-Doped Diamond and Electrodecorated with Silver (Ag/GO/BDD) Electrode for Tetracycline Detection in Aqueous Solution

Nanomaterials (Basel). 2021 Jun 14;11(6):1566. doi: 10.3390/nano11061566.

Authors

Sorina Negrea^{1

2}, Lidia Ani Diaconu¹, Valeria Nicorescu¹, Sorina Motoc M Ilies³, Corina Orha⁴, Florica Manea⁵

Affiliations

¹ National Institute of Research and Development for Industrial Ecology (INCD ECOIND), 300431 Timisoara Branch, Romania.
² Department of Environmental Engineering and Management, "Gheorghe Asachi" Technical University of Iasi, 700050 Iasi, Romania.
³ "Coriolan Dragulescu" Institute of Chemistry, Romanian Academy, Mihai Viteazul 24, 300223 Timisoara, Romania.
⁴ National Condensed Matter Department, Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara, 1 P. Andronescu Street, 300254 Timisoara, Romania.
⁵ Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, P-ta Victoriei No. 2, 300006 Timisoara, Romania.

Abstract

A new electrochemical sensor designed by modifying the commercial boron-doped diamond (BDD) electrode with graphene oxide (GO) reduced electrochemically and further electrodecorated with silver (Ag), named the Ag/GO/BDD electrode, was selected among a series of the BDD, GOelectroreduced onto BDD (GO/BDD) and silver electrodeposited onto BDD (Ag/BDD) electrodes for the detection of tetracycline (TC) in aqueous solution. The best results regarding the sensitivity of 46.6 µA·µM^-1·cm^-2 and the lowest limit of detection of 5 nM was achieved using square-wave voltammetry (SWV) operated at the step potential of 5 mV, modulation amplitude of 200 mV and the frequency of 10 Hz in alkaline medium. The application of the alkaline supporting electrolyte-based procedure is limited for water monitoring due to the presence of chloride that interferes with TC detection; however, it can be applied for quantitative determination of pharmaceutical formulations. 0.1 M Na₂SO₄ supporting electrolyte eliminated chloride interference and can be used for the application of Ag/GO/BDD in practical detection of TC in water.

Keywords: electrochemical detection; silver electrocatalyst; silver-graphene oxide-boron-doped diamond; tetracycline.