Magnetic CoFe₂O₄–Graphene Hybrids: Facile Synthesis, Characterization, and Catalytic Properties

Abstract

This paper reports the synthesis of magnetic CoFe 2 O 4 −reduced graphene oxide (rGO) hybrids and the catalytic performance in heterogeneous activation of peroxymonosulfate (PMS) for decomposition of phenol. The surface morphologies and structures of the CoFe 2 O 4 −rGO hybrids were investigated by field emission scanning electron microscopy (SEM), energydispersive X-ray spectrometer (EDS), transmission electron microscopies(TEM), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption−desorption isotherm, and thermogravimetric analysis (TGA). Through an in situ chemical deposition and reduction, CoFe 2 O 4 −rGO hybrids with CoFe 2 O 4 nanoparticles of 23.8 nm were produced. Catalytic testing showed CoFe 2 O 4 −rGO hybrids exhibited much better catalytic activity than CoFe 2 O 4 , which suggests rGO plays an important role in CoFe 2 O 4 −rGO hybrids for the decomposition of phenol. Moreover, the hybrid catalyst presents good magnetism and could be separated from solution by a magnet.

Hydrothermal synthesis of magnetic CoFe2O4/graphene nanocomposites with improved photocatalytic activity

“…CoFe 2 O 4 is one of the most studied multi-ferroic photocatalysts which can easily initiate electron transfer under UV-vis light [23]. Although some publications studied the photocatalytic performance of the graphene incorporated CoFe 2 O 4 hybrids [24,25], few of them focused on the CoFe 2 O 4 /graphene nanocomposites in degrading dyes in dyestuff wastewaters. Furthermore, the promising separability and reusability of the CoFe 2 O 4 /graphene nanocomposite enable it with wider application potentials in practical dye degradation operations when compared with other metal oxide/graphene photocatalysts, since the CoFe 2 O 4 /graphene nanocomposite does not introduce foreign pollutants to the wastewater system during the whole degradation process.…”

Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

“…Among these metal oxides used as supercapacitor, the research on Fe 2 O 3 is relatively rare, however, Fe 2 O 3 is abundant, low cost, and nontoxic and is therefore deserves being investigated as supercapacitors [25,26]. Recently, lots of work, which focused on ferric nanocomposite, have been reported [27][28][29][30][31][32][33][34][35][36][37][38][39]. Among them, ferric and graphene nanocomposite are newly reported.…”

Electrochemical Detection of Ultra-trace Cu(II) and Interaction Mechanism Analysis Between Amine-Groups Functionalized CoFe 2 O 4 /Reduced Graphene Oxide Composites and Metal Ion

“…A typical experiment for the synthesis of CoFe2O4/rGO composites based on the previous reports [33,40] by the addition of CoAc2·6H2O. In brief, 25 mg of GO sheets was dispersed into 40 mL ethylene glycol with sonication for 2 h. Then 0.635 g of CoAc2·6H2O, 3.9 g of NH4Ac, and 1.35 g of FeCl3·6H2O were added into the above mixture solution, respectively, and then the mixture solution was stirred for an hour, forming a homogeneous solution at room temperature.…”