Graphene nanosheets modified with curcumin-decorated manganese dioxide for ultrasensitive potentiometric sensing of mercury(II), fluoride and cyanide

Alma Mejri; Abdelmoneim Mars; Hamza Elfil; Ahmed Hichem Hamzaoui

doi:10.1007/s00604-018-3064-3

Graphene nanosheets modified with curcumin-decorated manganese dioxide for ultrasensitive potentiometric sensing of mercury(II), fluoride and cyanide

Mikrochim Acta. 2018 Nov 6;185(12):529. doi: 10.1007/s00604-018-3064-3.

Authors

Alma Mejri¹, Abdelmoneim Mars^{2

3}, Hamza Elfil⁴, Ahmed Hichem Hamzaoui¹

Affiliations

¹ Valorization Laboratory of Useful Materials (LVMU), National Center of Material Science Research (CNRSM), Techno-park Borj Cedria, BP 273, 8020, Soliman, Tunisia.
² Valorization Laboratory of Useful Materials (LVMU), National Center of Material Science Research (CNRSM), Techno-park Borj Cedria, BP 273, 8020, Soliman, Tunisia. abdelmoneim.mars@gmail.com.
³ Laboratory of Natural Water Treatment (LABTEN), Water Researches and Technologies Center, Techno-park Borj Cedria, BP 273, 8020, Soliman, Tunisia. abdelmoneim.mars@gmail.com.
⁴ Laboratory of Natural Water Treatment (LABTEN), Water Researches and Technologies Center, Techno-park Borj Cedria, BP 273, 8020, Soliman, Tunisia.

PMID: 30402665
DOI: 10.1007/s00604-018-3064-3

Abstract

A glassy carbon electrode (GCE) was modified by electropolymerization of curcumin on MnO₂-Gr nanosheets to obtain a detection method for Hg(II) and for the anions fluoride and cyanide. The complexation by curcumin can be monitored by potentiometry. The results revealed a cathodic shift for the simultaneous detection of fluoride and cyanide and an anodic shift for the mercury(II) sensing, with peak potentials of -0.24, 0.12 and 0.82 V, respectively (vs. Ag/AgCl). The modified GCE is fairly selective, reproducible and repeatable. The detection limits are 19.2 nM for Hg(II), 17.2 nM for fluoride, and 28.3 nM for cyanide (LOD, S/N = 3). The method was successfully applied to the analysis of spiked samples of tap water, river water and petrochemical refinery wastewater. Graphical abstract Schematic of an electrochemical curcumin-MnO₂-graphene nanosheet platform for the simultaneous assay of fluoride, cyanide and mercury(II) in the ppb concentration range in various natural and wastewater samples.

Keywords: Chronoamperometry; Curcumin; Cyanide; Differential pulse voltammetry; Fluoride; Graphene; Manganese dioxide; Mercury(II); Simultaneous detection.