Immobilization of palladium nanoparticles on the magnetic quantum dots based on the carbon of chitosan and its catalytic efficiency in reduction of nitroarenes

Subject Areas : شیمی آلی

fatemeh rafiee ¹ ( Associate Prof. of Department of Organic Chemistry, Factually of Chemistry, Alzahra University, Tehran, Iran. )
niloofar tajfar ² ( M.Sc. Student in Organic Chemistry, Factually of Chemistry, Alzahra University, Tehran, Iran. )

Received: 2023-02-18 Accepted : 2023-08-26 Published : 2023-11-22

Keywords: Chitosan, Palladium, Carbon-based quantum dots, Nitroarene reduction,

Abstract :

Quantum dot carbon nanoparticles based on magnetic chitosan (Fe3O4@CQD) were prepared through hydrothermal carbonization of chitosan biopolymer and then magnetization with iron oxide (Fe3O4) nanoparticles. Then, in the presence of palladium chloride in ethanol as a solvent under reflux conditions without using a reducing agent, palladium nanoparticles were stabilized on the surface of carbon quantum dots, and finally, Fe3O4@CQD@Pd nanocatalyst was obtained. The prepared nanocatalyst was characterized by photoluminescence (PL), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Inductively coupled plasma (ICP), Vibrating-sample magnetometry (VSM), and X-ray diffraction (XRD) techniques. The efficiency of this magnetic nanocatalyst was evaluated in the reduction reaction of nitroarene derivatives as environmental pollutants, with electron-donating and electron-withdrawing. In the presence of prepared nanocatalyst, at room temperature, and in H2O:EtOH (1:1) as green solvent, aniline derivatives were obtained in excellent yields at short reaction times. Moreover, the nanocatalyst was separated by applying an external magnet and reused at least for four successive runs without a decrease in its catalytic activity.

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