Abstract
Core-shell Fe 3 O 4 -SiO 2 -Polypyrrole nanoparticles have been prepared, and their adsorption of Cr 2 O 7 2− ions investigated. Nanoparticle morphology and structure were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and infrared spectroscopic techniques. Their magnetic saturation values were determined using a vibration sample magnetometer. The nanoparticle structure was composed of a polycrystalline Fe 3 O 4 inner core (diameter ~400 nm), and outer shells of amorphous SiO2 (thickness ~100 nm) and polypyrrole (thickness ~100 nm). The magnetic saturation was found to be 43.5 emu/g. The adsorption of Cr 2 O 7 2− was characterized using inductively coupled plasma atomic emission spectroscopy. The maximum saturated adsorption capacity was calculated to be 35.52 mg/g, by fitting to a Langmuir adsorption isotherm model. This result suggested that the nanoparticles could be applied to Cr 2 O 7 2− adsorption, with high efficiency magnetic separation.
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