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The object of this study was to evaluate the efficiency of safranin O dye removal with application of magnetite nanoparticles (Fe₃O₄ NPs) as adsorbent. For this propose, NPs of Fe₃O₄ were synthesized via a chemical precipitation method with addition of sodium hydroxide to solutions of Fe²⁺ and Fe³⁺. The prepared NPs were characterized by XRD and TEM and the applicability of the synthesized NPs for removing of safranin O as a cationic dye from aqueous solutions was investigated. The surface of Fe₃O₄ NPs was modified with addition of sodium dodecyl sulfate as an anionic surfactant. The effects of various parameters on the removal efficiency of safranin O such as the type and amount of surfactant, pH of solution, salt effect and contact time were studied and optimized. The studies of sorption kinetics of the dye showed a rapid sorption dynamics by a second-order kinetic model, suggesting chemisorption …