Fabrication and characterization of the Fe3O4@SiO2–rGO nanocomposite: a catalyst for multi-component reactions

Lavasani, Fatemeh Sheikholia; Khalaj, Zahra; Kabirifard, Hassan; Monajjemi, Majid

doi:10.1039/d2cp05354c

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d2cp05354c

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Fabrication and characterization of the Fe₃O₄@SiO₂–rGO nanocomposite: a catalyst for multi-component reactions

Fatemeh Sheikholia Lavasani

Zahra Khalaj

Hassan Kabirifard

et al.

Abstract: A novel nanocomposite is synthesized by covalently modifying reduced Graphene oxide (rGO) with Fe3O4@SiO2 nanoparticles. Fe3O4 was synthesized using a co-precipitation method, and SiO2 was then coated onto Fe3O4 by...

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Cited by 3 publications

References 48 publications

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Photocatalytic activation of peroxydisulfate by UV-LED through rGO/g-C3N4/SiO2 nanocomposite for ciprofloxacin removal: Mineralization, toxicity, degradation pathways, and application for real matrix

Pourmadadi,

Aghababaei,

Abdouss

2024

Chemosphere

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Photocatalytic activation of peroxydisulfate by UV-LED through rGO/g-C3N4/SiO2 nanocomposite for ciprofloxacin removal: Mineralization, toxicity, degradation pathways, and application for real matrix

Pourmadadi,

Aghababaei,

Abdouss

2024

Chemosphere

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Facile microwave synthesis of various-shaped magnetite/ reduced graphene oxide heterostructures and their magnetization properties

Zedan,

Moussa,

El-Shall

2024

Sci Rep

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Heterostructures of magnetite (Fe 3 O 4 ) nanoparticles and reduced graphene oxide (RGO) sheets are very common composite materials for different applications such as catalysis, energy storage, and biomedicine. Developing methods for the facile control of the size and shape of both freestanding Fe 3 O 4 nanoparticles and those anchored onto RGO sheets is in demand. Herein, we report on the rapid and facile microwave synthesis (MWS) of Fe 3 O 4 nanoparticles and Fe 3 O 4 /RGO with various sizes and shapes using the oleylamine (OAm)/oleic acid (OAc) ligand pair. The solvothermal synthesis using microwave irradiation (MWI) resulted in the concurrent conversion of graphene oxide (GO) into RGO and the in-situ formation of various-shaped Fe 3 O 4 on RGO sheets. Freestanding Fe 3 O 4 nanoparticles of various shapes were prepared using MWS for comparison. The morphological, structural, and surface properties of the samples were studied using different characterization techniques. The magnetization properties of the prepared samples were determined using a vibrating sample magnetometer. Various-shaped standalone and RGO-supported Fe 3 O 4 nanoparticles including nanospheres, nanocubes, and nanotriangles were synthesized via MWI at 1000 W for 20 min by changing the ratios of the iron precursor and the OAm/OAc ligand pair. Interestingly, the MWI using OAm/OAc ligand pair of a molar ratio of 3:4 resulted in the in-situ formation of large hexagonal Fe 3 O 4 /RGO. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results confirm the crystallinity and spinel structure of the prepared Fe 3 O 4 samples and prove the concurrent conversion of GO into RGO with assemblies of Fe 3 O 4 nanoparticles. The magnetization measurements further emphasized the role of size and shape in affecting the magnetic properties of Fe 3 O 4 and Fe 3 O 4 /RGO heterostructures. The results identify the qualities of the prepared samples and prove the MWS as a facile one-pot method for the preparation of Fe 3 O 4 and Fe 3 O 4 /RGO heterostructures.

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Adsorption of lithium ions from aqueous solution by magnetic aluminum-based adsorbents

Qin,

Yang,

Shi

et al. 2023

PLoS ONE

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Magnetic aluminum-based adsorbents (MLDHs) were prepared with a coprecipitation method and used to separate lithium ions from the aqueous solutions. In static adsorption experiment, the adsorption capacity of MLDHs for lithium ions reached 8.22 mg/g. In a mixed solution of various metal ions, the adsorbents exhibited higher selectivity for lithium ions. Kinetic studies indicated that the adsorption process conformed to a pseudo-second-order model. The experimental data were fitted with nonlinear regression using commonly used adsorption isotherms. It was found that the adsorption isotherm process could be described by the Langmuir model. In addition, the thermodynamic parameters revealed that the adsorption of lithium was a spontaneous endothermic process.

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Fabrication and characterization of the Fe₃O₄@SiO₂–rGO nanocomposite: a catalyst for multi-component reactions

Abstract: A novel nanocomposite is synthesized by covalently modifying reduced Graphene oxide (rGO) with Fe3O4@SiO2 nanoparticles. Fe3O4 was synthesized using a co-precipitation method, and SiO2 was then coated onto Fe3O4 by...

Cited by 3 publications

References 48 publications

Photocatalytic activation of peroxydisulfate by UV-LED through rGO/g-C3N4/SiO2 nanocomposite for ciprofloxacin removal: Mineralization, toxicity, degradation pathways, and application for real matrix

Photocatalytic activation of peroxydisulfate by UV-LED through rGO/g-C3N4/SiO2 nanocomposite for ciprofloxacin removal: Mineralization, toxicity, degradation pathways, and application for real matrix

Facile microwave synthesis of various-shaped magnetite/ reduced graphene oxide heterostructures and their magnetization properties

Adsorption of lithium ions from aqueous solution by magnetic aluminum-based adsorbents

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