Plasma Induced Multi-Walled Carbon Nanotube Grafted With 2-Vinylpyridine for Preconcentration of 60Co(Ⅱ) From Aqueous Solutions
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Graphical Abstract
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Abstract
Multi-walled carbon nanotubes(MWCNTs) were modified with 2-vinylpyridine (VP) by using N2 plasma technique. The application of MWCNTs-g-VP in the preconcentration of 60Co(Ⅱ) from large volumes of wastewater was investigated under ambient conditions. The results indicate that the VP molecules grafted on the surfaces of MWCNTs-g-VP can prevent the entanglement of MWCNTs and provide more functional groups, promoting the sorption of 60Co(Ⅱ) on MWCNTs-g-VP. The preconcentration of 60Co(Ⅱ) on MWCNTs-g-VP is strongly dependent on pH values and ionic strength, suggesting that inner sphere complexation and outer-sphere complexation are the preconcentration mechanisms. According to the results simulated by Langmuir model, the maximum sorption capacities (Cmax) of 60Co(Ⅱ) are 13.9 mg/g on MWCNTs-g-VP at pH=7.5. The relatively high sorption capacity shows that MWCNTs-g-VP is a suitable material for the preconcentration and immobilization of radionuclides from large volumes of aqueous solutions in environmental pollution treatment.
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