| 内容提要: |
MnFe2O4/multi-wall carbon nanotubes (MMWCNT) as a new nanocomposite adsorbent with the magnetic separation performance was synthesized by a simple one-step low-temperature refluxing route. The structure, morphology and magnetic properties of the prepared composite were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), magnetization measurement, BET surface area measurement, X-ray diffraction, FTIR spectra and Raman spectroscopy. The results showed that MnFe2O4 particles coated on the surface of multi-wall carbon nanotubes in the composites. Due to its combinational merits and the outer magnetite materials, MMWCNT exhibited a high removal of TC and a remarkable magnetic separability. Batch experiments were carried out to investigate adsorption kinetics, adsorption isotherms and the effect of solution pH values on the removal of TC. Kinetic could be expressed by the linear pseudo-second-order kinetic model. Isotherm data were fitted well with the Langmuir models, revealing that the adsorption of TC onto MMWCNT is mainly a monolayer adsorption process. The TC adsorption process is endothermic and the increase of temperature is favoring its removal. MMWCNT has a wide pH range for efficient TC adsorption. All these results indicated that the synthesized composite had the potential to be applied as adsorbent for the removal of TC in water treatment.
|