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Magnetic chitosan nanocomposites have been synthesized on the basis of metal (Fe, Co, Ni)-encapsulated carbon nanomaterials. The organic layer was identified using Fourier transform infrared spectroscopy and elemental analysis. The functionalized nanomaterials were employed to remove metal ions: cadmium, copper, nickel, lead and zinc from aqueous solutions. Their adsorption capacities were studied by the batch procedure. The concentration of cations extracted was determined by inductively coupled plasma mass spectrometry. The influence of different parameters (pH, amount of the support studied, contact time) on the cation extraction was investigated. The studies demonstrated excellent ability of copper and lead adsorption, and satisfactory adsorption of other ions applied by the supports studied. The nanocomposites with complexed cations can be easily removed from water with the help of an external magnet. They can then undergo regeneration in an acidic environment and can be reused in the analogous process repeatedly.

Adsorption of metal ions on magnetic carbon nanomaterials bearing chitosan-functionalized silica