Synthesis of nickel-copper-zinc ferrite nanoparticles by sol-gel auto- combustion microwave-assisted method for remove of methylene blue dye

Document Type : Research paper

Authors

Department of Chemistry, Iran University of Science and Technology, Tehran, Iran

Abstract

Ni0.2-xCuxZn0.8Fe2O4 ferrite nanoparticle powders were prepared with special ratios (X = 0, 0.1, 0.2) by automatic sol-gel auto-combustion using microwaves. The resulting powders use X-ray diffraction, scanning electron microscopy, infrared spectroscopy, X-ray energy scattering, diffuse reflection spectroscopy and vibrating sample magnetometer and photocatalytic activity of the samples were analyzed by UV-Vis analysis. The average crystal grain size of magnetic nanoparticles was calculated using half-maximum full-width data (FWHM) and X-ray scattering according to the Dubai-Sherry formula. The results of the X-ray diffraction pattern showed that the obtained ferrite nanoparticles have a single-phase cubic spinel structure and do not have an impure phase. Careful observations through scanning electron microscopy have shown that nickel-zinc-copper ferrite nanoparticles were spherical in shape. From the IR peak of the octagonal and tetrahedral vibrations, the formation of the spinel structure was confirmed. The presence of nickel, copper and zinc elements in ferrite nanoparticles was confirmed by EDX analysis. The peak absorption of ferrite nanoparticles obtained from the diffusion spectrum (DRS) was 310, 438 and 315 nm, respectively. Finally, magnetic measurements show that ferrite nanoparticles are highly saturated with ferromagnetic matter. In following, the photocatalytic and adsorption activity of the samples for removing of methylene blue contaminants with concentration of 5 and 15 mg/mL were investigated in 3 times. It was shown that the ferrite sample containing only nickel had better absorption and destruction of the contaminant than other ferrite samples.

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