Electrochemical sensing platform based on Zeolite/Graphite/Dimethylglyoxime nanocomposite for highly selective and ultrasensitive determination of nickel

• Published in: Journal of hazardous materials Vol. 448; p. 130953
• Main Authors: Fendrych, Katarzyna, Porada, Radosław, Baś, Bogusław
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 15-04-2023
• Subjects: Dimethylglyoxime; Electrochemical Sensors; Nickel; Voltammetry; Zeolite; Voltammetry; Nickel; Dimethylglyoxime; Zeolite; Electrochemical Sensors
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2023.130953

In this work, the fabrication and analytical application of a novel, unique, mercury-free, and user-friendly voltammetric sensor of Ni(II) based on glassy carbon electrode (GCE) modified with zeolite(MOR)/graphite(G)/dimethylglyoxime(DMG) composite (MOR/G/DMG-GCE) and the voltammetric procedure for highly selective, ultra-trace determination of nickel ions were reported for the first time. Deposition of a thin layer of the chemically active MOR/G/DMG nanocomposite enables the selective and effective accumulation of Ni(II) ions in the form of the DMG-Ni(II) complex. In 0.1 mol L−1 ammonia buffer (pH 9.0), the MOR/G/DMG-GCE exhibited linear response in the Ni(II) ions concentration range of 0.86 − 19.61 µg L−1 and 0.57 − 15.75 µg L−1, for the accumulation time of 30 s and 60 s, respectively. For 60 s of accumulation time, the limit of detection (S/N = 3) was 0.18 µg L−1 (3.04 nM), and sensitivity of 0.202 µA L µg−1 was achieved. The developed protocol was validated by the analysis of wastewater certified reference materials. Its practical usefulness was confirmed by the determination of nickel released from metallic jewelry submerged in artificial sweat and stainless steel pot during water boiling. The obtained results were verified by electrothermal atomic absorption spectroscopy as a reference method.
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•The mordenite/graphite/dimethylglyoxime modified glassy carbon electrode (MOR/G/DMG-GCE) was presented.•A new voltammetric protocol for the ultrasensitive determination of Ni(II) was developed.•The synergistic effect of MOR/G as electrocatalyst of the Ni(II) reduction was confirmed.•The superior selectivity, sensitivity, and LOD were achieved without sample pretreatment.•The method was validated and applied for the determination of Ni released from jewelry.