In this study, magnetic iron oxide/graphene oxide (Fe 3 O 4 /GO) nanocomposites were developed for removal of cadmium ions (Cd 2+ ) from water, which could be effectively separated from the solution owing to its superparamagnetic property. The Fe 3 O 4 /GO nanocomposites were fabricated by coprecipitation method with different precursor ratios of 8:1, 4:1, 2:1, and 1:1. It was found that the suitable ratio of Fe 3 O 4 /GO for Cd 2+ ions adsorption was 4:1 (FG2). The effects of contact time, pH, and metal initial concentration on the adsorption properties of FG2 for Cd 2+ in water were investigated. The adsorption data of FG2 followed pseudo-second-order kinetic and Langmuir isotherm models with the maximum adsorption capacity of 52.083 mg g −1 at pH 8. The structure and morphology of FG2 were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface area, and vibrating sample magnetometry (VSM). TEM images of FG2 presented the Fe 3 O 4 nanoparticles in the size range of 10-15 nm decorated on GO nanosheets. The BET specific surface area of FG2 was observed to be 180.84 m 2 g −1 . VSM result of FG2 was 41.13 emu g −1 . Accordingly, FG2 could be considered as a highly efficient adsorbent for removing Cd 2+ from water.
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