Sintesis dan Karakterisasi Morfologi serta Struktur Kristal untuk Material Komposit Fe3O4/SiO2 dengan Variasi Penambahan SiO2

Abstract

The synthesis and characterization of Fe3O4/SiO2 composite with variations of SiO2 using the coprecipitation method have been successfully carried out. Fe3O4 has a magnetic ability that can degrade dye waste, while SiO2 has good compatibility to coat magnetic materials. In this study, five variations of SiO2 addition were used, namely the addition of 1 g, 1.1 g, 1.2 g, 1.3, 1.4 g. The synthesized Fe3O4/SiO2 composites were then characterized with Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX) for surface analysis and mapping of sample constituent elements, X-ray Diffraction (XRD) to determine the crystal phase and lattice structure parameters, Fourier Transform Infra-Red (FT-IR) to analyze functional groups, and Vibrating Sample Magnetometer (VSM) to measure its magnetic properties. The SEMEDX analysis results show a decrease in the average particle size of the sample as SiO2 increases. The XRD characterization results indicated that the sample crystallized well, marked by the appearance of diffraction peaks corresponding to COD Magnetite No. 96-900-6923. The FT-IR test results showed the presence of SiO-Si groups that are characteristic of SiO2 and Fe-O functional groups that represent the characteristics of Fe3O4. VSM results show a decrease in magnetic saturation, remanent magnetization, and sample coercivity due to the addition of SiO2. The coercivity value of the sample obtained is smaller than 200 Oe which indicates the sample is a soft magnetic material.