期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 18, 页码 9230-9236出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16584h
关键词
-
资金
- project of National 863 Hi-Tech Plan [2008AA06Z337]
- National Natural Science Foundation of China [21071137]
Magnetic-functionalized multi-walled carbon nanotubes (MWCNTs) with encapsulated Fe nanoparticles have been successfully fabricated via a one-step decomposition approach using ferrocene as a single precursor at a high temperature of 950 degrees C. The constituents, phase, and morphology have been characterized by X-ray diffraction, Raman spectroscopy and transmission electron microscopy (TEM). Magnetic measurements reveal the ferromagnetic nature of the material with a magnetization saturation of 82.6 emu g(-1) at room temperature. Full nitrogen sorption isotherms show that the magnetic-functionalized MWCNTs have a porous structure (2.0 nm, 6.42 nm and 11.4 nm) and large surface area (295.4 m(2) g(-1)). Owing to their wonderful intrinsic properties, these magnetic-functionalized MWCNTs exhibit excellent ability to remove heavy metal ions from aqueous solutions. For example, the removal efficiency can be up to 97% at a Cu2+ concentration of 100 mg L-1 using these magnetic-functionalized MWCNTs as adsorbents. In addition, because the Fe nanoparticles were wrapped by MWCNTs, the material can be used in acidic solution and the removal efficiency of Cu2+ can reach 90% even in a strong acid solution (pH = 1).
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