Journal of Industrial and Engineering Chemistry, Vol.20, No.4, 1765-1771, July, 2014
Sulfonated multi-walled carbon nanotubes for the removal of copper (II) from aqueous solutions
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Sulfonated multi-walled carbon nanotubes (s-MWCNTs) was prepared from purified multi-walled
carbon nanotubes (p-MWCNTs) by concentrated H2SO4 at elevated temperature. The structure was characterized by SEM, FTIR, Raman, XPS, and BET. It could be dispersed steadily in water at a dosage of 1.0 mg/mL for a week. The adsorption performance of s-MWCNTs toward Cu(II) was investigated including the effects of pH and ionic strength. Results indicated the adsorption was much dependent on pH but not on ionic strength. The adsorption capacity for Cu(II) was enhanced 58.9% via the sulfonation. Moreover, the adsorption mechanisms were carefully analyzed by Freundlich and D-R models.
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