Pembuatan dan Karakterisasi Campuran Fe3O4/SiO2 dengan Metode Kopresipitasi sebagai Adsorben Methylene Blue

Abstract

Research has been conducted on the manufacture and characterization of Fe3O4/SiO2 mixture using the coprecipitation method. This research is applied as an adsorbent on methylene blue. The mixing process begins with the activation of SiO2 with ZnCl2 activator and then mixing Fe3O4 with SiO2 that has been activated with each Fe3O4:SiO2:ZnCl2 mass ratio, is 4:2:10%, 4:2:15%, 4:2:20%, 4:2:25%, 4:2:30% and 4:2:35%. Then characterization was carried out, namely testing elemental content with X-Ray Flourisence (XRF), testing morphology and elemental distribution with Scanning Electron Microscope-Energy Dispersive X-Ray Spectroscopy (SEM-EDS), testing crystal structure with X-Ray Diffraction (XRD), testing functional groups with Fourier Transform-InfraRed (FT-IR), testing magnetic properties with Vibrating Sample Magnometer and testing methylene blue adsorption with UV-Vis. The results of analysis using XRF show that there is an elemental Fe content of 90%. The results of the analysis using SEM showed a spherical morphology with Fe3O4 coating SiO2, and with EDS testing showed the content of Fe, Si, C. O, Zn and Cl elements. The results of analysis using XRD show the crystal size of the Fe3O4/SiO2 mixture with ZnCl2 activator (10%, 15%, 20%, 25%, 30%, 35%) sequentially 35.54 nm, 42.85 nm, 42.861 nm, 42.864 nm, 42.861 nm and 35.548 nm. The results of analysis using FT-IR obtained Si-O-Si and Fe-O functional groups at wave numbers 806.17 cm-1 and 574 cm-1, respectively. The results of the analysis using VSM that the optimum condition of the magnetic properties produced is superparamagnetic and included in the soft magnetic which is in the Fe3O4/SiO2 mixture with ZnCl2 10% with a coercivity value of 184 Oe, a saturation value of 16.04 emu/g and a remanence value of 0.11 emu/g. The results of analysis using UV-Vis with a maximum wavelength of 664 nm obtained an adsorption efficiency value of 82% and can be applied as a methylene blue adsorbent.