MAGNETIC PROPERTIES AND Pb(II) ADSORPTION CAPACITY OF Fe3O4 AND MnFe2O4 NANOPARTICLES SYNTHESIZED BY UNTRALSONIC ASSISTED CO-PRECIPITATION METHOD

Abstract

In this paper, we present the research results on magnetic properties and Pb²⁺ adsorption capacity of Fe₃O₄ and MnFe₂O₄ nanoparticles synthesized by ultrasonic assisted co-precipitation method. The crystalline, morphology, particle diameter and magnetic properties of nanoparticles were investigated by X-ray diffraction, Field emission Scanning Electron Microscopy (FESEM) and Vibrating- Sample magnetometer (VSM). The analysis results indicate that under the same synthesized condition, Fe₃O₄ nanoparticles showed the spherical in shape with average size of 12 nm whereas MnFe₂O₄ nanoparticles offered near cubic shape with average size of 20 nm. Both samples exhibited superparamagnetic behavior at room temperature, blocking temperatures are 251 K and 268 K for Fe₃O₄ nanoparticles and MnFe₂O₄ nanoparticles, respectively. Magnetic nanoparticles also possese good magnetic properties with high saturation magnetizations of 72 emu/g for Fe₃O₄ sample and 65 emu/g for MnFe₂O₄ sample. Batchs experiments were carried out to investigate the Pb adsorption capacity of these magnetic nanoparticles. The adsorption data from our experiments fit the Langmuir isotherm confirmed that both samples yield the excellent adsorption property with the maximum adsorption capacity is 65.83 mg/g for Fe₃O₄ nanoparticles and 47.66 mg/g for MnFe₂O₄ nanoparticles.