Abstract
The object of this study was to evaluate the efficiency of safranin O dye removal with application of magnetite nanoparticles (Fe 3O 4 NPs) as adsorbent. For this propose, NPs of Fe 3O 4 were synthesized via a chemical precipitation method with addition of sodium hydroxide to solutions of Fe 2+ and Fe 3+. 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 Fe 3O 4 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 mechanism. Dye adsorption equilibrium data were fitted well to the Langmuir isotherm and the maximum monolayer capacity q max was calculated from the Langmuir as 769.23 mg g −1. The obtained results indicate that sodium dodecyl sulfate modified Fe 3O 4 NPs can be used as an efficient adsorbent material for adsorption of cationic dyes from aqueous solutions.
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