High nitrogen content in fiberboard is a common industrial waste that, if left untreated, can lead to environmental pollution and resource wastage. This study aims to produce nitrogen-rich fiberboard char (FC) from waste fiberboard through CO activation and Fe-doping, and to investigate its effectiveness in removing methylene blue (MB) from solution. The elemental composition, pore structure, micromorphology, and functional group distribution of FC were analyzed using ultimate analysis, BET, XRD, FTIR, SEM, and XPS. Additionally, the study delved into isothermal adsorption, adsorption kinetics, and potential adsorption mechanisms. The char (FC-CO-Fe), prepared through the synergistic activation of CO and Fe-doping, exhibited a larger specific surface area, a developed micropore structure, and abundant nitrogen and oxygen functional groups on its surface, making it more effective for the adsorption of MB. The π-π interaction between the ring structure of FC and the aromatic ring structure of MB, along with the electrostatic interaction between the functional groups, further enhanced its adsorption properties. Experimental findings indicated that FC achieved a maximum adsorption capacity of 56.61 mg/g for MB, with a removal efficiency of 37.74 %. Both Langmuir and Freundlich isothermal adsorption models, as well as pseudo-first-order and pseudo-second-order kinetic models, successfully described the isothermal adsorption and adsorption kinetics of MB by FC. The adsorption process appeared to involve a combination of physical and chemical adsorption mechanisms. Therefore, FC shows promise as a potential adsorbent for treating dye wastewater, with favorable prospects for applications.

中文翻译：

---

用于去除亚甲基蓝的掺铁富氮纤维板炭：关于炭表征、吸附特性和机制的见解


纤维板中氮含量较高，是一种常见的工业废物，如果不加以处理，会导致环境污染和资源浪费。本研究旨在通过CO活化和Fe掺杂从废纤维板中生产富氮纤维板炭（FC），并研究其去除溶液中亚甲基蓝（MB）的有效性。利用元素分析、BET、XRD、FTIR、SEM 和 XPS 对 FC 的元素组成、孔结构、微观形貌和官能团分布进行了分析。此外，该研究还深入研究了等温吸附、吸附动力学和潜在的吸附机制。通过CO和Fe掺杂协同活化制备的炭（FC-CO-Fe）具有较大的比表面积、发达的微孔结构以及丰富的表面氮氧官能团，使其更有效MB 的吸附。 FC的环结构与MB的芳环结构之间的π-π相互作用以及官能团之间的静电相互作用进一步增强了其吸附性能。实验结果表明，FC对MB的最大吸附容量为56.61 mg/g，去除效率为37.74%。 Langmuir和Freundlich等温吸附模型以及准一级和准二级动力学模型都成功地描述了MB的等温吸附和FC吸附动力学。吸附过程似乎涉及物理和化学吸附机制的结合。因此，FC作为一种潜在的吸附剂用于处理染料废水，具有良好的应用前景。