Synthesis, Properties of Graphene Oxide-Metal Oxide Mixed Nanocomposites and their Applications - Review

In this report, nitrogen-, boron- and boron/nitrogen-doped graphene and nitrogen-doped carbon nanohorn were prepared. Electrochemical analysis has shown the higher capacitance performance of the nitrogen-doped graphene (NG) electrode, because nitrogen provides free valence electron to interact with electrolyte. Then magnetic metal oxides were in situ hybridized to a nitrogen-doped graphene to produce magnetic metal oxide/NG hybrid materials, and the electrochemical measurements of the prepared hybrid material electrodes were conducted without and with the external magnetic field (8.98 mT at the inflection point) of using a Helmholtz coil. The specific capacitance took an increasing order of NiO/NG (697 F/g, 747 F/g) < Co3O4/NG (963 F/g, 1092 F/g) < Fe3O4/NG (973 F/g, 1254 F/g) in an external magnetic field of (0 mT, 8.98 mT) at a scan rate of 5 mV/s. Although these electrodes displayed high capacitance and better charge/discharge profile, cycle retention (83 to 92% under no magnetic field) was not necessarily good or it fluctuated under 8.98 mT. These behaviours by the addition of magnetic metal oxides and external magnetic field are due to the electrical conductivity of metal oxides and the Lorentz force effect of the magnetic field, respectively. Thus, it can be confirmed that Fe3O4/NG hybrid has higher potential as a magnetic material electrode for supercapacitors and the magnetic field enhances the capacitance.

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Effect of External Magnetic Field on Hybrid Supercapacitors of Nitrogen-Doped Graphene with Magnetic Metal Oxides

Fite

Rao

Imae

2020

Bulletin of the Chemical Society of Japan

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Adsorption of hexavalent chromium from water using graphene oxide/zinc molybdate nanocomposite: Study of kinetics and adsorption isotherms

Rahulan²,

Sujatha³

et al. 2023

Front. Energy Res.

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Hexavalent chromium is one of the most hazardous contaminants that threaten the environment. The present research work involves the synthesis of Graphene Oxide/Zinc molybdate (GO/ZM) nanocomposite by wet chemical route. The structure and morphology of the synthesized samples were analysed by various characterization techniques such as X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-Vis Spectroscopy, and High-Resolution Transmission Electron Microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) surface area analysis, Barrett-Joyner-Halenda (BJH) pore size analysis and Raman Spectroscopy. The efficiency of the prepared samples for removing hexavalent chromium from the water was investigated by performing batch adsorption studies. The maximum adsorption capacity was optimum at using 6 mg adsorbent, under conditions pH 2 with contact time for 120 min and temperature 283 K. Two isotherm models and two kinetic models were used to study the adsorption mechanism of Cr(VI) ions adsorption on the surface of GO/ZM nanocomposite. The results of isotherm and kinetic modelling shows that the adsorption of Cr(VI) using GO/ZM nanocomposite was well described by Freundlich Isotherm model with higher correlation coefficient (R2 = .985) and follows pseudo second order kinetic model.

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Synthesis of 2D-Material(G,GO,rGO,h-BN)-Magnetic(Fe,Fe3O4)Nanocomposites

Chkhartishvili,

Makatsaria,

Barbakadze

et al. 2024

NHC

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For the purpose of synthesizing 2D-Material–Magnetic nanocomposites, several new modifications of existing 2D-materials synthesis methods by exfoliation and chemical synthesis from liquid charge are developed. Using them, graphene (G), graphene oxide (GO), reduced graphene oxide (rGO) and hexagonal boron nitride (h-BN) matrix magnetic nanocomposites for the first time are obtained by coating or intercalation their nanoparticles with ferromagnetic iron (Fe) or ferrimagnetic iron oxide – magnetite (Fe3O4). These materials are prospective for variety of high tech applications. In particular, h-BN–Fe3O4 composite nanoparticles can serve for neutron-capturing boron isotope 10B effective delivery agents in BNCT (Boron Neutron Capture Therapy) of cancer as they allow the controlling by an external magnetic field targeting to tumor tissue.

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Synthesis, Properties of Graphene Oxide-Metal Oxide Mixed Nanocomposites and their Applications - Review

Cited by 3 publications

References 28 publications

Effect of External Magnetic Field on Hybrid Supercapacitors of Nitrogen-Doped Graphene with Magnetic Metal Oxides

Effect of External Magnetic Field on Hybrid Supercapacitors of Nitrogen-Doped Graphene with Magnetic Metal Oxides

Adsorption of hexavalent chromium from water using graphene oxide/zinc molybdate nanocomposite: Study of kinetics and adsorption isotherms

Synthesis of 2D-Material(G,GO,rGO,h-BN)-Magnetic(Fe,Fe3O4)Nanocomposites

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