Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes

Raicopol, Matei D.; Pandele, Andreea M.; Dascălu, Constanţa; Vasile, Eugeniu; Hanganu, Anamaria; Vasile, Gabriela-Geanina; Bugean, Ioana Georgiana; Pirvu, Cristian; Stanciu, Gabriela; Buica, George-Octavian

doi:10.3390/s20236799

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Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes

¹,

¹,

²,

¹,

Gabriela-Geanina Vasile

⁴

Ioana Georgiana Bugean

¹,

Cristian Pirvu

Gabriela Stanciu

^5,* and

George-Octavian Buica

^1,*

Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu St., 011061 Bucharest, Romania

Faculty of Applied Sciences, University Politehnica of Bucharest, 313 Splaiul Independenţei, 060042 Bucharest, Romania

Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, 90-92 Sos. Panduri, 050657 Bucharest, Romania

⁴

National Research and Development Institute for Industrial Ecology ECOIND Bucharest, 71-73 Drumul Podul Dambovitei Street, 060652 Bucharest, Romania

⁵

Department of Chemistry and Chemical Engineering, Ovidius University, 124 Mamaia Blvd, 900527 Constanta, Romania

Authors to whom correspondence should be addressed.

Sensors 2020, 20(23), 6799; https://doi.org/10.3390/s20236799

Received: 2 November 2020 / Revised: 22 November 2020 / Accepted: 26 November 2020 / Published: 28 November 2020

(This article belongs to the Section Chemical Sensors)

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Abstract

A new thiosemicarbazone ligand was immobilized through a Cu(I)-catalyzed click reaction on the surface of glassy carbon (GC) and electrochemically reduced graphene oxide (GC-ERGO) electrodes grafted with phenylethynyl groups. Using the accumulation at open circuit followed by anodic stripping voltammetry, the modified electrodes showed a significant selectivity and sensibility for Hg(II) ions. A detection limit of 7 nM was achieved with the GC modified electrodes. Remarkably, GC-ERGO modified electrodes showed a significantly improved detection limit (0.8 nM), sensitivity, and linear range, which we attribute to an increased number of surface binding sites and better electron transfer properties. Both GC and GC-ERGO modified electrodes proved their applicability for the analysis of real water samples. View Full-Text

Keywords: modified electrodes; electrochemically reduced graphene oxide; thiosemicarbazone; click chemistry; anodic stripping voltammetry; mercury determination

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MDPI and ACS Style

Raicopol, M.D.; Pandele, A.M.; Dascălu, C.; Vasile, E.; Hanganu, A.; Vasile, G.-G.; Bugean, I.G.; Pirvu, C.; Stanciu, G.; Buica, G.-O. Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes. Sensors 2020, 20, 6799. https://doi.org/10.3390/s20236799

AMA Style

Raicopol MD, Pandele AM, Dascălu C, Vasile E, Hanganu A, Vasile G-G, Bugean IG, Pirvu C, Stanciu G, Buica G-O. Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes. Sensors. 2020; 20(23):6799. https://doi.org/10.3390/s20236799

Chicago/Turabian Style

Raicopol, Matei D., Andreea M. Pandele, Constanţa Dascălu, Eugeniu Vasile, Anamaria Hanganu, Gabriela-Geanina Vasile, Ioana G. Bugean, Cristian Pirvu, Gabriela Stanciu, and George-Octavian Buica. 2020. "Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes" Sensors 20, no. 23: 6799. https://doi.org/10.3390/s20236799

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Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes

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