Abstract
Mesoporous magnetic Co-NPs(nanoparticles)/carbon nanocomposites were synthesized by carbonization of polyacrylonitrile (PAN) microspheres entrapped with cobalt salt for the first time. The structure and morphology of the porous magnetic nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), and N2 adsorption–desorption technique. The nanocomposites possess very high saturation magnetization (Ms is up to ∼133emu/g), near-zero remanence, and very low coercivity (Hc is down to ∼0.023KOe). Meanwhile, the nanocomposites have mesoporous structure with average pore size of 4nm and high specific surface area of 232m2/g, which can be tuned by changing the carbonization conditions. Using methyl orange (MO) as model pollutant in water, the mesoporous magnetic nanocomposites showed good adsorption capacity of 380mg/g, and the absorbed MO could be easily released in ethanol. The mesoporous nanocomposites were facile separated from solution under external magnetic force, and over 85% adsorption capacity for MO could be retained after five adsorption/desorption cycles.
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