Synthesis and Characterization of Magnetic NanosizedFe3O4/MnO2Composite Particles

[摘要] Using the preparedFe3O4particles of 10 nm–25 nm as magnetic core, we synthesizedFe3O4/MnO2composite particles withMnO2as the shell by homogeneous precipitation. Their structure and morphology were characterized by X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), transmission electronic microscopy (TEM), Fourier transform infrared spectra (FTIR), and vibration-sample magnetometer (VSM). We show that with urea as precipitant transparent and uniformMnO2coating of ca.3 nm thick onFe3O4, particles can be obtained. The composite particles have better dispersivity than the starting materials, and exhibit super-paramagnetic properties and better chemical adsorption ability with saturated magnetization of 33.5 emu/g. Decoloration experiment of methyl orange solution withFe3O4/MnO2composite suggested that the highest decoloration rate was 94.33% when the pH of methyl orange solution was 1.3 and the contact time was 50 minutes. So this kind ofFe3O4/MnO2composite particle not only has super-paramagnetic property, but also good ability of chemical adsorption.

[学科分类] 材料工程