• efficient removal of heavy metal ions by thiol-functionalized superparamagnetic carbon nanotubes

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 585
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    • شماره تماس دبیرخانه رویداد: -
     thiol-functionalized multiwall carbon nanotube/magnetite nanocomposites (cnts/fe3o4) were synthesized, and were investigated by power x-ray diffraction, transmission electron microscopy, energy-dispersive x-ray spectrometer, fourier transform infrared spectroscopy, thermogravimetric analyses, bet analysis and physical properties measurement system. the results showed that the 3-mercaptopropyltriethoxysilane (mpts) was successfully grafted on the surface of cnts/fe3o4 nanocomposites. the as-synthesized thiol-functionalized cnts/fe3o4(mpts-cnts/fe3o4) nanocomposites exhibited superparamagnetic property and higher specific surface area than that of cnts/fe3o4 nanocomposites at room temperature. the adsorption properties of hg2+ and pb2+ as a function of contact time, ph value and initial metal concentration were characterized by an inductively coupled plasma optical emission spectroscopy (icp-oes). the pseudo-first-order kinetic equation could better than that of pseudo-second-order kinetic equation to describe the adsorption kinetics of the before and after thiol-functionalized nanocopmposites. the removal efficiency of cnts/fe3o4 nanocomposites and mpts-cnts/fe3o4nanocomposites was highly ph dependent and the optimal ph value for adsorption was 6.5. the adsorption isotherms of hg2+ and pb2+ by mpts-cnts/fe3o4 nanocomposites matched well with the langmuir model with the maximum adsorption capacities of 65.52 and 65.40 mg/g, respectively.

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