State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, People's Republic of China.
J Colloid Interface Sci. 2013 Jan 1;389(1):10-5. doi: 10.1016/j.jcis.2012.08.022. Epub 2012 Aug 24.
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 N(2) adsorption-desorption technique. The nanocomposites possess very high saturation magnetization (Ms is up to ~133 emu/g), near-zero remanence, and very low coercivity (Hc is down to ~0.023 KOe). Meanwhile, the nanocomposites have mesoporous structure with average pore size of 4 nm and high specific surface area of 232 m(2)/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 380 mg/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.
介孔磁性 Co-NPs（纳米粒子）/碳纳米复合材料是通过碳化包裹钴盐的聚丙烯腈（PAN）微球首次合成的。多孔磁性纳米复合材料的结构和形态通过 X 射线衍射（XRD）、透射电子显微镜（TEM）、振动样品磁强计（VSM）和 N（2）吸附-脱附技术进行了表征。该纳米复合材料具有非常高的饱和磁化强度（Ms 高达约 133 emu/g）、近零剩磁和非常低的矫顽力（Hc 低至约 0.023 KOe）。同时，纳米复合材料具有介孔结构，平均孔径为 4nm，比表面积高达 232m²/g，通过改变碳化条件可以对其进行调节。以水中的甲基橙（MO）为模型污染物，介孔磁性纳米复合材料表现出良好的吸附能力，可达 380mg/g，吸附的 MO 可在乙醇中轻易释放。介孔纳米复合材料在外加磁场下易于从溶液中分离，经过五次吸附/脱附循环后，仍保持超过 85%的 MO 吸附能力。
