Reduced graphene oxide nanosheets modified with nickel disulfide and curcumin nanoparticles for non-enzymatic electroche
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ORIGINAL PAPER
Reduced graphene oxide nanosheets modified with nickel disulfide and curcumin nanoparticles for non-enzymatic electrochemical sensing of methyl parathion and 4-nitrophenol Alma Mejri 1 & Abdelmoneim Mars 2
&
Hamza Elfil 2 & Ahmed Hichem Hamzaoui 1
Received: 24 April 2019 / Accepted: 17 September 2019 # Springer-Verlag GmbH Austria, part of Springer Nature 2019
Abstract A method was designed for simultaneous voltammetric determination of methyl parathion pesticide (MP) and 4-nitrophenol (4NP). Curcumin nanoparticles were deposited on reduced graphene oxide nanosheets that were modified with nickel disulfide. The material was placed on a screen-printed carbon electrode and then displayed high electrocatalytic activities toward MP and 4NP, with a peak potential near −0.9 and − 0.7 V (vs. pseudo Ag/AgCl), respectively. Figures of merit include (a) good electrochemical sensitivities (7.165 and 6.252 μA·μM−1·cm−2), (b) wide linear ranges (from 0.25 to 80 μM), (c) low limits of detection (8.7 and 6.9 nM at S/N = 3) for MP and 4-NP, respectively, and (d) good selectivity, repeatability, reproducibility, and storage stability. The method was applied in the determination of MP and 4-NP in tomato and apple juices and spiked river water. Keywords Curcumin nanoparticles . NiS2-reduced graphene oxide . Electrocatalytic activity . Non-enzymatic sensing . Organophosphate pesticide . Vegetarian juice
Introduction Extensively applied in the treatment of agricultural crop diseases before and after harvest, the organophosphorus (OP) pesticides pose serious risks to human health and the environment [1]. According to the European Union (EU), the admissible limit concentrations of individual pesticide are 50 μg.kg−1 and 0.1 μg.L−1 in food issued of plant and water, respectively [2]. Among these pesticides, methyl parathion (MP) is considered one of the highly toxic organophosphorus pesticides with an orally median lethal dose of 3.0 μg.kg−1 [3]. Thus, MP affects acetylcholinesterase (AChE) protein that is crucial for Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-019-3853-3) contains supplementary material, which is available to authorized users. * Abdelmoneim Mars [email protected] 1
Valorization Laboratory of Useful Materials (LVMU), National Center of Material Science Research (CNRSM), University of Carthage, Techno-park Borj Cedria, BP 273, 8020 Soliman, Tunisia
2
Laboratory of Natural Water Treatment (LABTEN), Water Researches and Technologies Center, University of Carthage, Techno-park Borj Cedria, BP 273, 8020 Soliman, Tunisia
the functions of the central and peripheral nervous system [4]. Furthermore, 4-nitrophenol (4-NP) is a common environmental pollutant widely used in industrial and agricultural applications [5]. According to the US Environmental Protection Agency (USEPA), 4-NP was identified as a potential carcinogen that affects the kidneys, blood and nervous system with an allowed limited concentration around 0.43 μmol.L−1 [6]. Various
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