<![CDATA[Dyes are one of the sources of water pollution that is difficult to treat because synthetic dyes have a complex and relatively stable chemical structure. This study aims to examine the effect of synthesis temperature on the properties of Fe3O4 and to reveal its performance as a photocatalyst for the degradation of Procion red dye (PRD). Fe3O4 was synthesized using the coprecipitation method at various temperatures (30, 50, and 70 oC) and characterized using XRD, VSM, UV-Vis DRS, and SEM-EDS. The Fe3O4 with the best characterization was then used for the PRD photodegradation and optimization using Response Surface Methodology (RSM) with Central Composite Design (CCD). The characterization showed that increasing the synthesis temperature affected the crystallite size, magnetic properties, and optical properties. Fe3O4 synthesized at 70 oC had a crystallite size of 15.80 nm, saturation magnetization (Ms) of 78.73 emu/g, and a band gap of 2.02 eV. These characteristics indicate that Fe3O4 has a nanocrystalline size, strong magnetic properties to facilitate separation, and the ability to absorb light in the visible region. Therefore, Fe3O4 synthesized at a temperature of 70 oC was chosen for PRD photodegradation applications. The optimization results produced a quadratic model and optimum conditions at a PRD concentration of 50 mg/L, pH 5.6, and irradiation time of 43.60 min, with a removal efficiency of 97.49%. The reusability test showed that the degradation efficiency decreased by less than 10% after five consecutive cycles, indicating the good stability and reusability of Fe3O4 as a photocatalyst.Keywords: Fe3O4, coprecipitation, Synthesis Temperature, Procin red dye, reusability]]>
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