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Adsorption Performance of Methylene Blue onto Nanoparticles of Carbon-Encapsulated Magnetic Nickel |
Ranran LI1,Hao HUANG1,Xinglong DONG1,**( ),Yonghui WANG1,Hongtao YU2,Xie QUAN2,Youngguan JUNG3 |
1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beam, Ministry of Education, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China 2. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China 3. Department of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, South Korea |
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Cite this article:
Ranran LI,Hao HUANG,Xinglong DONG,Yonghui WANG,Hongtao YU,Xie QUAN,Youngguan JUNG. Adsorption Performance of Methylene Blue onto Nanoparticles of Carbon-Encapsulated Magnetic Nickel. Chinese Journal of Materials Research, 2015, 29(9): 663-670.
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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 m2g-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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Received: 08 October 2014
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Fund: *Supported by National Basic Research Program of China No.2011CB936002 and National Natural Science Foundation of China Nos. 51271044, 51331006 & 51171033. |
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