Green synthesis of copper oxide nanoparticles using Ficus elastica extract for the electrochemical simultaneous detection of Cd2+, Pb2+, and Hg2

• Published in: RSC advances Vol. 13; no. 27; pp. 18734 - 18747
• Main Authors: Djihane Slimane Ben Ali, Krid, Ferial, Nacef, Mouna, El Hadi Boussaha, Chelaghmia, Mohamed Lyamine, Tabet, Habiba, Selaimia, Radia, Atamnia, Amira, Abed Mohamed Affoune
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 15.06.2023; The Royal Society of Chemistry
• Subjects: Cadmium; Chemistry; Copper oxides; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrodes; Infrared spectroscopy; Low concentrations; Mercury (metal); Nanoparticles; Polyanilines; Sensors; Spectrum analysis; Square waves; Thermal analysis; Voltammetry
• ISSN: 2046-2069
• DOI: 10.1039/d3ra02974c

In this paper, for the first time, we report the use of a new carbon paste electrode based on a low-cost pencil graphite powder modified with polyaniline (PANI) and green synthesized copper oxide nanoparticles using Ficus elastica extract as a sensor for Cd2+, Pb2+, and Hg2+. The elaborated electrode was characterized by FT-IR spectroscopy, field-emission gun scanning electron microscopy (FEG-SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and simultaneous thermal analysis (TGA/DSC). The electrochemical behavior of the sensor was evaluated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy techniques. According to CV, as well as square wave voltammetry (SWV) results, it was found that the CuONPs/PANI–CPE sensor was able to determine very low concentrations of Cd2+, Pb2+, and Hg2+ in HCl (0.01 M) either in single metal or in multi-metal solutions with a high sensitivity. Furthermore, Cd2+, Pb2+, and Hg2+ simultaneous detection on CuONPs/PANI–CPE achieved very low limits of detection (0.11, 0.16, and 0.07 μg L−1, respectively). Besides, the designed sensor displayed a good selectivity, reproducibility, and stability. Moreover, CuONPs/PANI–CPE enabled us to determine with high accuracy Cd2+, Pb2+, and Hg2+ traces in environmental matrices.