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Hydrothermal Synthesis of Novel Magnetic Plate-Like Bi2O2CO3/CoFe2O4 Hybrid Nanostructures and Their Catalytic Performance for the Reduction of Some Aromatic Nitrocompounds

Parisa Zarringhadam, Saeed Farhadi


Novel magnetically separable Bi2O2CO3/CoFe2O4 nanocomposites were fabricated by a feasible hydrothermal route. Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), vibrating sample magnetometer (VSM), and N2 adsorption–desorption analysis were employed to examine the structure, morphology, particle size, phase composition, optical and magnetic properties of the as-synthesized nanocomposites. The results of the findings showed demonstrated the successful coupling of spherical CoFe2O4 nanoparticles and plate–like Bi2O2CO3 nanostructures. The catalytic performance of magnetic Bi2O2CO3/CoFe2O4 nanocamposites was evaluated in the reduction of some aromatic nitrocompounds such as nitrophenols and nitroanilines by using sodium borohydride (NaBH4) aqueous solution at room temperature. The Bi2O2CO3/CoFe2O4 nanocamposite with 30 %wt. CoFe2O4 exhibited the best performance in the reduction of aromatic nitrocompounds with 100% conversion into the corresponding amino compounds within 15-30 min with rate constant of 0.10-0.24 min−1. The effect of catalyst dosage was also investigated on the efficiency of reduction process. Furthermore, magnetic Bi2O2CO3/CoFe2O4 nanocomposite could be easily removed by an external magnet from the reaction system.


Plate-like Bi2O2CO3; Bismuth-based nanomaterials; Cobalt ferrite, Magnetic nanocomposite; Catalytic reduction; Nitrophenols.

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