Due to considerable application of perfluorooctanoic acid (PFOA) and its refractory degradation, the widespread distribution of PFOA has already resulted in its’ risks to environment and organisms. However, the intrinsic characteristic of pristine multi-walled carbon nanotubes (MWCNTs) limited their application for removing PFOA from aqueous medium. Therefore, three nano-metals (nano-crystalline iron, copper and zinc) grafted MWCNTs were synthesized and characterized by BET-N₂, TEM, FTIR, XPS and XRD as well as MWCNTs (as the control treatment) in this study. The results showed that nano metals were well grafted on the surface of MWCNTs. Adsorption were investigated by using radioactive labeled PFOA (¹⁴C-PFOA) to quantify the trace PFOA. Adsorption kinetics showed the adsorption of PFOA on the metal doped MWCNTs (MDCNTs) was controlled by intra-particle diffusion. Adsorption isotherms showed the sorption amounts on the MDCNTs were higher than the control. This attributed much to the hydrophobic interaction, electrostatic interaction and the formation of the inner sphere complexes. Ionic strength (0-100 mM) and ionic species (Ca²⁺) had little effects on the sorption of MDCNTs. PFOA adsorption on MDCNTs strongly depended on pH value in the medium. These results provide an innovative approach for removing trace PFOA from liquid medium.

由于全氟辛酸（PFOA）的大量应用及其难降解性，PFOA的广泛分布已经导致其对环境和生物体的风险。然而，原始的多壁碳纳米管（MWCNT）的固有特性限制了它们在从水性介质中去除PFOA的应用。因此，本研究合成了三种纳米金属（纳米晶铁，铜和锌）接枝的MWCNT，并用BET-N ₂，TEM，FTIR，XPS和XRD以及MWCNT（作为对照处理）对其进行了表征。结果表明，纳米金属被很好地接枝到了多壁碳纳米管的表面。通过使用放射性标记的PFOA研究了吸附（¹⁴C-PFOA）来定量痕量PFOA。吸附动力学表明，PFOA在金属掺杂的MWCNTs（MDCNTs）上的吸附是通过颗粒内扩散来控制的。吸附等温线显示MDCNTs上的吸附量高于对照。这在很大程度上归因于疏水相互作用，静电相互作用和内球络合物的形成。离子强度（0-100 mM）和离子种类（Ca ²⁺）对MDCNTs的吸附影响很小。PFOA在MDCNTs上的吸附强烈依赖于介质中的pH值。这些结果提供了一种从液体介质中去除痕量PFOA的创新方法。