中文摘要：

采用等离子体诱导方法在多壁碳纳米管（multi—walled carbon nanotubes，MWCNTs）上修饰上乙烯吡啶，获得乙烯吡啶改性碳纳米管（碳纳米管-乙烯吡啶，MWCNTs-g-VP）。用静态批实验的方法研究了pH值、吸附剂浓度和离子强度等因素对碳纳米管-乙烯吡啶富集放射性核素^60Co（Ⅱ）的影响。结果表明：引入乙烯吡啶不仅能改善碳纳米管在水溶液中的分散性，同时还能提高碳纳米管表面官能团的含量，进而提高碳纳米管对^60Co（Ⅱ）的富集效果；pH值与离子强度对碳纳米管-乙烯吡啶富集^60Co（Ⅱ）有显著影响；碳纳米管-乙烯吡啶富集^60Co（Ⅱ）的作用方式包括内层络合和外层络合。Langmuir模型拟合结果显示：在pH-7．5时，碳纳米管-乙烯吡啶对^60Co（Ⅱ）的最大富集量是13．9mg／g，相对较高的富集量说明碳纳米管-乙烯吡啶可以用于水溶液中放射性核素的富集。

英文摘要：

Multi-walled carbon nanotubes（MWCNTs） were modified with 2-vinylpyridine （VP） by using Nz plasma technique. The application of MWCNTs-g-VP in the preconcentra- tion of 60Co（ Ⅱ ） from large volumes of wastewater was investigated under ambient condi tions. 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 mecha- nisms. According to the results simulated by Langmuir model, the maximum sorption caDac-ities （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.