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Date of Publication:2015-01-01

Journal:材料研究学报

Volume:29

Issue:9

Page Number:663-670

ISSN No.:1005-3093

Abstract:Nanoparticles of carbon encapsulated nickel (Ni@C NPs) were in-situ
   synthesized by direct current arc-discharge plasma method through
   evaporating pure Ni in methane atmosphere. Transmission electron
   microscopy observation revealed that the nanoparticles (Ni@C NPs)
   exhibited an encapsulation structure with Ni metal as core and carbon
   3-5 nm in thickness as shell. The BET surface area of the prepared Ni@C
   NPs is 38.82 m~2·g~(-1) according to N2 adsorption-desorption isotherm.
   Surface modification with hydrogen peroxide was carried to graft
   oxygen-containing groups on carbon, which can improve the wettability
   and hydrophilicity of the Ni@C NPs. Then the effect of contact time,
   adsorption time and pH values on the adsorption of methylene blue was
   systematically investigated with the surface modified Ni@C NPs as
   adsorbent. The adsorption kinetics was analyzed with pseudo-first-order
   and pseudo-second-order models and the adsorption isotherm of methylene
   blue onto Ni@C NPs was fitted by Langmuir and Freundlich models. In
   addition, the result of recycling experiments for 5 cycles showed that a
   recovery rate 69.4% for the adsorbent could be reached. Furthermore,
   results of trial separation of Ni@C NPs by applied magnetic fields show
   that the magnetic field assisted separation technology is efficient
   means for the recycling and reuse of this adsorbent.

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