The magnetic nitrogen-doped carbon (MNC) was prepared from polypyrrole by a simple high temperature calcination process in this paper. The structure and properties of MNC were analyzed by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, Brunner-Emmet-Teller, vibrating sample magnetometer, and X-ray photoelectron spectroscopy. The capacity of MNC to adsorb Cr(VI) and Pb(II) was evaluated. The effects of the initial pH, dosage, concentration and temperature on the adsorption capacity of MNC were measured. MNC had a large specific surface area and a special porous structure. Its nitrogen and carbon sources were rich, and the ratio of carbon to nitrogen was fixed. The maximum Cr(VI)-adsorption capacity and maximum Pb(II) adsorption capacity of MNC could reach 456.63 and 507.13 mg·g⁻¹ at 318 K, respectively. The pseudo-second-order model was used to describe the adsorption kinetics of MNC, and the Freundlich model was employed to discuss its isotherms. The adsorption process was affected by the electrostatic force, the reducing reaction, pores and chelation. The results of this study suggest that MNC is a material with superior performance, and is very easily regenerated, reused, and separated in the adsorption process.

本文通过简单的高温煅烧工艺，由聚吡咯制备了磁性氮掺杂碳（MNC）。通过扫描电子显微镜，傅立叶变换红外光谱，X射线衍射，Brunner-Emmet-Teller，振动样品磁力计和X射线光电子能谱分析了MNC的结构和性能。评估了MNC吸附Cr（VI）和Pb（II）的能力。测量了初始pH，剂量，浓度和温度对MNC吸附能力的影响。MNC具有较大的比表面积和特殊的多孔结构。它的氮和碳源丰富，并且碳与氮的比例是固定的。MNC的最大Cr（VI）吸附能力和最大Pb（II）吸附能力分别为456.63和507.13 mg·g ^-1分别为318 K 用伪二级模型描述了MNC的吸附动力学，并使用Freundlich模型讨论了其等温线。吸附过程受静电力，还原反应，孔和螯合的影响。这项研究的结果表明，MNC是一种性能卓越的材料，在吸附过程中非常容易再生，再利用和分离。