Surface-tuned hierarchical ɤ-Fe2O3–N-rGO nanohydrogel for efficient catalytic removal and electrochemical sensing of toxic nitro compounds
- Authors
- Ramu, A.G.; Salla, S.; Gopi, S.; Silambarasan, P.; Yang, D.J.; Song, M.J.; Ali, H.M.; Salem, M.Z.M.; Choi, D.
- Issue Date
- Apr-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- 2D-graphene oxide; Catalytic reduction; Electrochemical sensor; Nanohydrogel; Spinel nanocrystals
- Citation
- Chemosphere, v.268
- Journal Title
- Chemosphere
- Volume
- 268
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80627
- DOI
- 10.1016/j.chemosphere.2020.128853
- ISSN
- 0045-6535
- Abstract
- 4- Nitrophenol (4-NP) is a top rated hazardous environmental pollutant and secondary explosive chemicals. For the sake of ecology and environment safety, the catalytic reduction and detection of 4-NP is highly important. In this work, ɤ-Fe2O3-nitrogen doped rGO (ɤ-Fe2O3–N-rGO) nanohydrogel was synthesized by green hydrothermal method. The morphology and phase purity of prepared ɤ-Fe2O3–N-rGO nanohydrogel were confirmed by various analytical (SEM, TEM, XRD, and XPS) and electrochemical techniques. The morphological structure of ɤ-Fe2O3–N-rGO nanohydrogel confirmed that the nanocrystals are well covered over the 2D N-rGO layer. Further, ɤ-Fe2O3–N-rGO nanohydrogel was applied for the catalytic reduction and electrochemical detection of ecotoxic 4-NP. A low cost, ɤ-Fe2O3–N-rGO nanohydrogel displayed an excellent catalytic activity, high recyclability (>5 cycles) and high conversion efficiency of 4-NP to 4-Aminophenol (4-AP). In addition, ɤ-Fe2O3–N-rGO nanohydrogel modified GCE displayed a wide linear sensing range (0.1–1000 μM), and a low detection limit (LOD) of 0.1 μM with excellent sensitivity, high selectivity (<1.2%) and good stability (>4 weeks). The developed sensor electrode shows the low reduction potential of −0.3 V and −0.60 V for the determination of 4-NP. The proposed ɤ-Fe2O3–N-rGO nanohydrogel is promising catalyst for the detection and removal of toxic aromatic nitro compounds in real site applications. © 2020 Elsevier Ltd
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