Ionic liquid-enhanced rGO@Fe₂O₃ nanohybrid-based conducting paper for efficient phenolic pollutant detection in wastewater
Year: 2025
Type: article
Abstract: We report the fabrication of a sensitive and selective electrochemical biosensor based on ionic liquid (IL)-modified reduced graphene oxide (rGO)-iron oxide (IL-rGO@Fe2O3) nanohybrid for the electrochemical detection of polyphenol compounds in the wastewater. The IL-rGO@Fe2O3 nanohybrid has been synthesised by grafting Fe2O3 nanoparticles onto the surface of rGO, followed by the functionalisation with 1-Allyl-3-methylimidazolium bromide and 1-Butyl-2-phenylimidazolium chloride ionic liquids (ILs). The synthesised IL-rGO@Fe2O3 nanohybrid has been used to fabricate the conducting paper (CP) electrode. Density functional theory and density of states analysis show that the functionalisation of ILs remarkably modifies rGO sheets’ electronic properties by enhancing conductivity. The effect of different solvents on the electrical conductivity of CP modified with IL-rGO@Fe2O3 was examined, and it has been observed that the electrical conductivity of the IL-rGO@Fe2O3/CP electrode enhanced to 4.42 × 10−2 Scm−1 after its treatment with DMSO. Further, the biosensing electrode has been fabricated by covalent immobilising the laccase (Lac) enzyme onto the IL-rGO@Fe2O3/CP electrode. The Lac/IL-rGO@Fe2O3/CP electrode showed high sensitivity (0.722 µA/µMcm2), a wide detection range (0.1–25 µM) and a low detection limit of 0.01 µM for hydroquinone (HQ) detection. The biosensor was able to detect HQ in river and tap water samples with an excellent recovery rate.
Source: Figshare
Authors: Raza, Mohd. Jamshaiya, Kaur, Navjot, Riyazuddeen, Pandey, Chandra Mouli
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6902316653
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