Dual-Functional Graphene-Based Flexible Material for Membrane Filtration and Electrochemical Sensing of Heavy Metal Ions

Simultaneous removal and quantification of heavy metal ions are very important since they threaten human health. In this work, a dual-functional, free-standing and flexible reduced graphene oxide (rGO) based paper-like material including zinc oxide nanoparticles (ZnO-NPs) and ethylenediaminetetraace...

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Bibliographic Details
Published in:IEEE sensors journal 2021-02, Vol.21 (3), p.2468-2475
Main Authors: Ercarikci, Elif, Alanyalioglu, Murat
Format: Article
Language:English
Subjects:
Adsorption
Cadmium
Copper
Crystallography
dual-functional graphene paper
Electrochemical analysis
Electrochemical metal sensor
Electrodes
Ethylenediaminetetraacetic acids
Filtration
flexible membrane
Graphene
heavy metal removal
Heavy metals
Ions
Lead
Membranes
Mercury (metal)
Metal ions
Morphology
Nanoparticles
Sensors
Ultrasonic processing
Vacuum filtration
Zinc oxide
Zinc oxides
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Summary:Simultaneous removal and quantification of heavy metal ions are very important since they threaten human health. In this work, a dual-functional, free-standing and flexible reduced graphene oxide (rGO) based paper-like material including zinc oxide nanoparticles (ZnO-NPs) and ethylenediaminetetraaceticacid (EDTA) was produced using successive vacuum-filtration and hydrothermal reduction processes. First, graphene oxide (GO) layers were coated with ZnO-NPs and then EDTA was immobilized by ultrasonic treatment. Prepared GO/ZnO-NPs-EDTA suspension was vacuum-filtrated on a membrane and peeled to obtain GO/ZnO-NPs-EDTA paper. Hydrothermal reduction resulted in rGO/ZnO-NPs-EDTA paper and this material is first-time performed for two applications: Simultaneous removal of heavy metal ions of Cd 2+ , Pb 2+ , Cu 2+ , and Hg 2+ and their further simultaneous electrochemical detection. Structural, chemical, crystallographic, optical, morphological, and electrochemical characterization of this paper-like material was executed using numerous techniques. Maximum adsorption performance of the rGO/ZnO-NPs-EDTA paper was determined as 2963, 8056, 600, and 1753 mg/g, while electrochemical simultaneous determination revealed linear ranges of 18.5-500, 22.4-700, 8.3-200, 3.3- 300~\mu \text{M} and detection limit values of 5.6, 6.8, 2.5, 1.0~\mu \text{M} for Cd 2+ , Pb 2+ , Cu 2+ , and Hg 2+ , respectively.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3021988