Synthesis and applications of magnetic nanoparticles in the ultrasound assisted oxidative degradation of methylene blue
Abstract
In this paper, catalytic behaviours of magnetite (Fe3O4), Ni- and Zn-doped Fe3O4 in the ultrasound assisted oxidative degradation of methylene blue from water were presented. Magnetic nanoparticles were synthesized from aqueous solutions of chloride salts of Fe(III), Ni(II) and Zn(II) by co-precipitation method and characterized by X-ray crystallographic, scanning electron microscopic (SEM) and Fourier transform infrared (FTIR) spectroscopic methods. Synthesized nanoparticles were then used as heterogeneous catalysts in the H2O2 based oxidative degradation of aqueous methylene blue solution at room temperature under mild ultrasound assisted reaction conditions. Instrumental results indicate the formations of round-shaped nanostructured particles with particle size <20 nm. Results also reveal that the synthesised Fe3O4 nanoparticles can remove as much as 82.51% of total methylene blue dye present in 36 ppm solution after 30 minutes reaction time. Doping Zn and Ni enhances the catalytic activity of Fe3O4 nanoparticles and maximum amounts of dye degradation (98.04% in 30 minutes) is observed for Zn-doped nanoparticles. Pseudo first order kinetic model can efficiently explain the decomposition of methylene blue from its solutions. Decomposition rate of methylene blue is observed to be maximum for the 0.2g/L catalyst dose. Additionally, catalytic dye degradation results are also discussed considering the Fenton type reaction mechanism.
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