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Fe 3 O 4 (magnetite) nanoparticles were synthesized by chemical co-precipitation method. The structure, morphology and magnetic properties of as-prepared were characterized by X Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X Ray Spectrometry (SEM-EDS), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). The result of XRD characterization was indicated Fe 3 O 4 as the product. SEM and TEM image of the Fe 3 O 4 showed nanoparticles Fe 3 O 4 have the mean diameter 5-20 nm. The EDS spectra showed strong peaks of Fe and O. Magnetic characteristic of Fe 3 O 4 nanoparticles was indicated super paramagnetic properties. The saturation magnetic was 89.46 emu g -1 . Therefore, the nanoparticles Fe 3 O 4 is suitable to remove dye in the water by a simple magnetic separation process. The optimum adsorption occurred at initial concentration of procion dye 100 mg L -1 , pH solution 6, dosage of Fe 3 O 4 0.8 g L -1 and contact time 30 minutes under room temperature with color removal 24.40 % and adsorption capacity was 30.503 mg g -1 .
Hariani et al. (Tue,) studied this question.