Platinum incorporated mordenite zeolite modified glassy carbon electrode used for selective electrochemical detection of mercury ions

• Published in: Microporous and mesoporous materials 2020-01, Vol.292, p.109770, Article 109770
• Main Authors: Sakthinathan, Subramanian, Tamizhdurai, P., Ramesh, A., Chiu, Te-Wei, Mangesh, V.L., Veerarajan, S., Shanthi, K.
• Format: Article
• Language: English
• Subjects: Electrochemical sensor; Low detection limit; Mercury (Hg2+); Mordenite; Platinum (Pt); Sensitivity
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2019.109770

Mercury (Hg2+) is considered as a dangerous toxic element that easily affects human and environmental ecosystem. For this reason, need to develop sensitive and selective detection of Hg2+ is more consideration. Platinum (Pt) incorporated dealuminated (D) mordenite decorated modified glassy carbon electrode (GCE) used for the electrochemical detection of Hg2+. Because, the Pt/D-mordenite modified electrode have mesostructured properties, active surface area, high electron transfers properties and sensitivity. The prepared electrode was characterized by different microscopic and spectroscopic technique. An electrochemical behavior of the electrode was identified by differential pulse voltammetry (DPV) and cyclic voltammetry (CV) technique. The GCE/Pt/D-mordenite electrode exhibit the higher peak current response towards the detection of Hg2+ metal ions than that of the other modified electrodes. Because, mordenite could provide higher active surface and Pt attributed to the higher electrocatalytic activity. The GCE/Pt/D-mordenite electrode exhibited an excellent detection limit (3.4 nM), higher sensitivity (11.2598 μA μM−1 cm−2), long linear range (0.1–220 μM), excellent selectivity, repeatability and reproducibility towards the detection of Hg2+ ions. The optimization parameters such as effect of the accumulating time, pH, and scanning potential towards the detection of Hg2+ ions were examined. Further, the interference studies show that interfering common metal ions had no influence on the Hg2+ ions response. Thus, the GCE/Pt/D-mordenite electrode as a suitable electrochemical sensor for the detection of Hg2+ metal ions in the waste water. The obtained Hg2+ ions detection level (LOD) was below the U.S. Environmental Protection Agency (EPA) and the World's Health Organization (WHO) guideline level. Scheme 1. Preparation of GCE/Pt/D-mordenite electrode used for the electrochemical detection of Hg2+ ions. [Display omitted] •The GCE/Pt/D-mordenite electrode applied for the detection of Hg2+ ions.•The GCE/Pt/D-mordenite electrode exhibit an excellent detection limit (3.4 nM).•The modified electrode shows high selectivity during the detection of Hg2+.•Investigated the accumulating time, pH, and potential at the electrochemical detection of Hg2+.•The obtained Hg2+ detection level (LOD) was below the WHO guideline level.