Concentration Dependences of Photocatalytic Activity in Green-Synthesis Fe3O4/TiO2 Nanocomposite Utilizing Moringa Oleifera for Methylene Blue Dye Degradation

Moringa Oleifera (MO) extract is used for green-synthesis of magnetic nanoparticles Fe₃O₄/TiO₂ for methylene blue (MB) dye degradation. Fe₃O₄ was characterized using an X-ray diffractometer (XRD) showing a cubic inverse spinel structure with an average crystallite size of 5.49 nm and an average crystallite size of Fe₃O₄/TiO₂ nanocomposites of 5.37 nm. In the UV-Vis results, the Fe₃O₄/TiO₂ nanocomposite has band gap of 3.48 eV. MB degradation increased by increasing mass of the Fe₃O₄/TiO₂ nanocomposite. The irradiation time of 60 minutes with a mass of 0.06 grams had the highest degradation percentage reaching 98.4%. The Fe₃O₄/TiO₂ nanocomposites can be reused up to two times without a significant decrease in the percentage of MB due to their magnetic properties.