Curcumin graphite pencil electrode modified with molybdenum disulfide nanosheets decorated gold foams for simultaneous quantification of nitrite and hydrazine in water samples

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

doi:10.1016/j.aca.2020.08.032

Curcumin graphite pencil electrode modified with molybdenum disulfide nanosheets decorated gold foams for simultaneous quantification of nitrite and hydrazine in water samples

Anal Chim Acta. 2020 Nov 15:1137:19-27. doi: 10.1016/j.aca.2020.08.032. Epub 2020 Aug 27.

Authors

Alma Mejri¹, Abdelmoneim Mars², Hamza Elfil², Ahmed Hichem Hamzaoui³

Affiliations

¹ Laboratory of Natural Water Treatment (LADVEN), Water Researches and Technologies Center, Techno-park Borj-Cedria, BP 273, 8020, Soliman, University of Carthage, Tunisia; Valorization Laboratory of Useful Materials (LVMU), National Center of Material Science Research (CNRSM), Techno-park Borj-Cedria, BP 273, 8020, Soliman, University of Carthage, Tunisia. Electronic address: almaa.mejri@gmail.com.
² Laboratory of Natural Water Treatment (LADVEN), Water Researches and Technologies Center, Techno-park Borj-Cedria, BP 273, 8020, Soliman, University of Carthage, Tunisia.
³ Valorization Laboratory of Useful Materials (LVMU), National Center of Material Science Research (CNRSM), Techno-park Borj-Cedria, BP 273, 8020, Soliman, University of Carthage, Tunisia.

PMID: 33153602
DOI: 10.1016/j.aca.2020.08.032

Abstract

A non-enzymatic sensor based on a curcumin modified pencil graphite electrode, loaded with molybdenum disulfide nanosheets decorated gold foam, was constructed. Herein, the electrochemical deposition strategy was adopted throughout the sensing platform design stepwise. The electroactivity of the pencil electrode platform enables sensitive simultaneous quantification of hydrazine and nitrite where the respective working potentials typically are at + 0.2 V for hydrazine and + 0.75 V for nitrite (both vs. Ag/AgCl, saturated KCl). It is shown that the resulting sensor demonstrates excellent analytical performances in terms of limits of detection (18.3, 21.7 nM), sensitivities (0.051, 0.061 μA μM^-1), and reproducibility standard deviations (RSD) of 3.1 and 2.7% for hydrazine and nitrite, respectively. Furthermore, long term stability studies showed that the electrodes exhibited an effectively unchanged response after some 30 days. The sensor was used to analyze spiked samples of river water and industrial wastewater.

Keywords: Curcumin film; Electrodeposition; Gold foam; MoS2 nanosheets; Pencil graphite electrode; Simultaneous sensing.