화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.32, No.11, 2247-2256, November, 2015
DOI10.1007/s11814-015-0072-4  Export Citation
Removal of Co(II) from aqueous solutions by sulfonated magnetic multi-walled carbon nanotubes
Juanjuan Yang, Yunhui Dong†, Jun Li, Zhengjie Liu1, Fanlian Min, and Yueyun Li†
  • Department of Chemical Engineering, Shandong University of Technology, Zibo 255049, P. R. China
  • 1Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China, Germany
E-mail:,
Sulfonated magnetic multi-walled carbon nanotubes (SMMWCNTs) were applied in the sorption of Co(II) from aqueous solutions. The SMMWCNTs were prepared and characterized by scanning electron microscope (SEM), Fourier transform infrared (FTIR), and X-ray diffractometer (XRD) test. A large number of influencing factors to the sorption process were investigated, such as pH, ionic strength, contact time, cations, anions, humic acid (HA), fulvic acid (FA) and temperature. The results indicated that the Co(II) sorption was strongly controlled by the pH and ionic strength. Moreover, foreign anions, such as F., Cl. and Br., had an obvious effect on the sorption process, which depended on the electronegativity of the anions. On the other hand, cations restrained sorption strongly, such as Mg2+ and Ca2+. The existence of HA/FA enhanced sorption process at pH<8 while weakened at pH>8. As revealed by the sorption results, the Langmuir adsorption model was more favorable than the Freundlich adsorption model, and the pseudo-second-order model could fit the data much better than the pseudo-first-order. The thermodynamic analysis suggested that sorption was spontaneous and endothermic. What’s more, the stability experiments of the SMMWCNTs showed that SMMWCNTs could maintain excellent magnetic stability and dispersion stability. Thus, this SMMWCNTs sorbent was believed to be a promising material for the selective removal of Co(II) from heavy metal-containing wastewater.
Keywords:Co(II);Sorption;Sulfonated Magnetic Multi-walled Carbon Nnanotubes
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