Pembuatan dan Karakterisasi Fe3O4/SiO2/TiO2 Anatase Sebagai Bahan Fotokatalis Methylene Blue

Abstract

The preparation of Fe3O4/SiO2/TiO2 has been prepared by co-precipitation method. The preparation process starts from mixing Fe3O4 with aquabidest as a solvent. Then, the resulting solution is mixed with SiO2 raw material, then added with TiO2 raw material. The precipitate is washed using ethanol and aquabides. The resulting precipitate is dried in an oven for 8 hours at T = 80 °C, then crushed with a mortar until smooth. The characterization in this study included surface morphology testing using a Scanning Electron Microscope (SEM), crystal structure testing using X-Ray Diffraction (XRD), magnetic properties using a Vibrating Sample Magnetometer (VSM), functional group testing using Fourier Transform Infra Red (FTIR), and methylene blue adsorption testing using a UV-Vis spectrophotometer. The results of the SEM analysis showed that the morphology was in the form of fine grains with different sizes and had different particle diameters. From the results of the XRD test, it was obtained that the crystal diameter in the Fe3O4 sample was 66.39 nm, the Fe3O4/SiO2 was 51.39 nm, the Fe3O4/SiO2 5% sample was 51.39 nm, the Fe3O4/SiO2/TiO2 sample was 66.1 nm and in the 5% Fe3O4/SiO2/TiO2 sample of 32.4 nm. The VSM test results stated that the optimum conditions for magnetic properties were at a concentration of 0% with Ms=21.63 emu/g, Mr=5.33 emu/g, Hc=185 Oe. The addition of TiO2 causes a shift in the absorption peak observed in the Infra Red spectrum which indicates that the cross-linking process was successful. Based on the results of the methylene blue adsorption test, the absorbance value has decreased.