Facile and ultra-sensitive voltammetric electrodetection of Hg2+ in aqueous media using electrodeposited AuPtNPs/ITO

In this study, we have investigated the use of electrodeposited Au–Pt nanoparticles (AuPtNPs) on indium tin oxide (ITO) for the detection of Hg2+ heavy ions in water samples. The mechanism of AuPtNP electrocrystallization on ITO glass in an aqueous solution containing 0.5 mM HAuCl4 + 0.5 mM H2PtCl6...

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Bibliographic Details
Published in:Analytical methods 2021-06, Vol.13 (24), p.2688-2700
Main Authors: Mohiedin Bagheri Hariri, Roozbeh Siavash Moakhar, Payman Sharifi Abdar, Zargarnezhad, Hossein, Shone, Matthew, Seyyed Alireza Rahmani, Moradi, Nasrin, Niksefat, Vahid, Bahadori, Kasra Shayar, Dolati, Abolghasem
Format: Article
Language:English
Subjects:
Aqueous solutions
Bimetals
Diffraction patterns
Drinking water
Electrochemical impedance spectroscopy
Electrochemistry
Gold
Heavy ions
Heavy metals
Indium tin oxides
Mercury (metal)
Nanoparticles
Nucleation
Scanning electron microscopy
Spectroscopy
Tin
Voltammetry
Water analysis
Water sampling
X-ray diffraction
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Summary:In this study, we have investigated the use of electrodeposited Au–Pt nanoparticles (AuPtNPs) on indium tin oxide (ITO) for the detection of Hg2+ heavy ions in water samples. The mechanism of AuPtNP electrocrystallization on ITO glass in an aqueous solution containing 0.5 mM HAuCl4 + 0.5 mM H2PtCl6 is described for the first time. The nucleation mechanism of monometallic AuNPs on ITO was found to be progressive; however, a transition from progressive to instantaneous was observed for bimetallic AuPtNPs at elevated overpotentials. The modified ITOs were then assessed for the electrodetection of Hg2+ in aqueous media. It was shown by differential pulse voltammetry (DPV) that the sensitivity of the constructed AuPtNPs/ITO electrode toward Hg2+ was about 2.08 μA nM−1. An approximate detection limit of 4.03 nM Hg2+ was achieved, which is below the permissible level of 30.00 nM Hg2+ in drinking water, according to the World Health Organization (WHO). Characterization of AuPt nanostructures was carried out by X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), and different electrochemical techniques (cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS)). Our results indicate a good potential of a facile and robust electrochemical assembly for on-site detection of heavy metals in water samples.
ISSN:1759-9660
1759-9679
DOI:10.1039/d1ay00361e