Composite Electrodes Based on Carbon Materials Decorated with Hg Nanoparticles for the Simultaneous Detection of Cd(II), Pb(II) and Cu(II)
López Fernández, Laia (Universitat Autònoma de Barcelona. Departament de Química)
Bastos Arrieta, Julio (Universitat de Barcelona)
Palet i Ballús, Cristina (Universitat Autònoma de Barcelona. Departament de Química)
Baeza Labat, Maria del Mar (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2022
Abstract:	Monitoring water quality has become a goal to prevent issues related to human health and environmental conditions. In this sense, the concentration of metal ions in water sources is screened, as these are considered persistent contaminants. In this work, we describe the implementation of customized graphite electrodes decorated with two types of Hg nanoparticles (Hg-NPs), optimized toward the electrochemical detection of Cd, Pb and Cu. Here, we combine Hg, a well-known property to form alloys with other metals, with the nanoscale features of Hg-NPs, resulting in improved electrochemical sensors towards these analytes with a substantial reduction in the used Hg amount. Hg-NPs were synthesized using poly(diallyldimethylammonium) chloride (PDDA) in a combined role as a reducing and stabilizing agent, and then appropriately characterized by means of Transmission Electron Microscopy (TEM) and Zeta Potential. The surface of composite electrodes with optimized graphite content was modified by the drop-casting of the prepared Hg-NPs. The obtained nanocomposite electrodes were morphologically characterized by Scanning Electron Microscopy (SEM), and electrochemically by Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The results show that the Hg-NP-modified electrodes present better responses towards Cd(II), Pb(II) and Cu(II) detection in comparison with the bare graphite electrode. Analytical performance of sensors was evaluated by square-wave anodic stripping voltammetry (SWASV), obtaining a linear range of 0. 005-0. 5 mg·L−1 for Cd2+, of 0. 028-0. 37 mg·L−1 for Pb2+ and of 0. 057-1. 1 mg·L−1 for Cu2+. Real samples were analyzed using SWASV, showing good agreement with the recovery values of inductively coupled plasma-mass spectrometry (ICP-MS) measurements.
Grants:	Agencia Estatal de Investigación RTI2018-099362-B-C21
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; Versió publicada
Subject:	Hg nanoparticles ; Electrode surface modification ; Nanocomposite graphite electrode ; Square-wave anodic stripping voltammetry ; Cyclic voltammetry ; Simultaneous metal detection ; Environmental analysis
Published in:	Chemosensors, Vol. 10, Núm. 4 (April 2022) , art. 148, ISSN 2227-9040

DOI: 10.3390/chemosensors10040148

15 p, 3.2 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > GENOCOV
Articles > Published articles