In this study, it was aimed to examine the use of a natural material as an alternative to the use of chemicals in the stabilization stage of nanoparticles in order to minimize the damage to the environment both during the production phase and after its use in water treatment. Fe_3O_4 nanoparticles were synthe-sised in accordance with the co-precipitation method; coated with peanut oil to stabilize the nanoparticles and their efficiency in the removal of nickel from aqueous solution was investigated. Scanning electron microscopy-energy dispersive X-ray (SEM-EDX), Fourier transform infrared spectrophotometer (FT-IR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD) analyzes were performed to characterize the green synthesised material. As a result of the Brunauer-Emmett-Teller (BET) analysis, the surface area of the Fe_3O_4 material coated with peanut oil was determined as 63.37 m~2/g. According to the data obtained from the batch experiments, the nickel removal efficiency of the nanoparticle at the optimum conditions (contact time: 50 min, nanoparticle dose: 8 g/L, pH: 8, and initial nickel concentration: 30 mg/L) was obtained as 96.6. Correlation coefficients of Freundlich and Langmuir isotherms were determined as 0.623 and 0.986, respectively.
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