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Title of Journal: Korean J Chem Eng

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Abbravation: Korean Journal of Chemical Engineering

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Springer US

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DOI

10.1007/bf02350115

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1975-7220

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Removal of CoII from aqueous solutions by sulfon

Authors: Juanjuan Yang Yunhui Dong Jun Li Zhengjie Liu Fanlian Min Yueyun Li
Publish Date: 2015/07/16
Volume: 32, Issue: 11, Pages: 2247-2256
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Abstract

Sulfonated magnetic multiwalled carbon nanotubes SMMWCNTs were applied in the sorption of CoII from aqueous solutions The SMMWCNTs were prepared and characterized by scanning electron microscope SEM Fourier transform infrared FTIR and Xray 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 CoII 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 pH8 while weakened at pH8 As revealed by the sorption results the Langmuir adsorption model was more favorable than the Freundlich adsorption model and the pseudosecondorder model could fit the data much better than the pseudofirstorder 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 CoII from heavy metalcontaining wastewater

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