Heteroatom doping endows magnetic carbons with unique electronic features and rich surface chemistry, significantly enhancing their adsorption performances for the environmental remediation. In this work, fluorine and nitrogen co-doped magnetic nanocarbon fibers (FN-MCFs) were prepared via a facile carbonization method combined with electrospinning procedure. FN-MCFs were used as adsorbents for Cr(VI) removal, displaying a remarkable activity with as high as 153.61 mg/g and 0.58 mg/m² of the Cr(VI) removal ability. F and N co-doping in magnetic nanocarbon fibers offered a higher specific surface area and disorder degree in graphite layer, therefore providing more active sites on the adsorbents surface. The electrostatic adsorption and reduction reaction between the Fe⁰, Fe²⁺ nanoparticles or edge carbons and Cr(VI) ions played significant roles in the adsorption process, which was believed to be facilitated by F and N co-doping. It was found that chemical adsorption was the main process in this work. Moreover, the adsorption capacity of FN-MCFs was majorly influenced by the doping level or doping type. F doping was found to be more important than N doping for the Cr(VI) removal in the dual-doping system. In addition, the excellent reusability of the FN-MCFs was observed.

杂原子掺杂赋予磁性碳以独特的电子特性和丰富的表面化学性质，从而大大提高了其对环境修复的吸附性能。在这项工作中，通过一种简便的碳化方法结合电纺丝工艺制备了氟和氮共掺杂的磁性纳米碳纤维（FN-MCFs）。FN-MCFs用作去除Cr（VI）的吸附剂，显示出显着的活性，高达153.61 mg / g和0.58 mg / m ²的Cr（VI）去除能力。磁性纳米碳纤维中的F和N共掺杂在石墨层中提供了更高的比表面积和无序度，因此在吸附剂表面上提供了更多的活性位点。Fe ⁰，Fe之间的静电吸附和还原反应。²⁺纳米颗粒或边缘碳和Cr（VI）离子在吸附过程中起着重要作用，据信这可以通过F和N共掺杂来促进。发现化学吸附是这项工作的主要过程。此外，FN-MCFs的吸附能力主要受掺杂水平或掺杂类型的影响。对于双掺杂系统中的Cr（VI）去除，发现F掺杂比N掺杂更重要。此外，观察到FN-MCF具有极好的可重用性。