Highly N-doped crab shell-derived carbon nanofibers (CSCNs) with enhanced sorption capacity for CO₂ and CH₄ are presented. Two different carbonization temperatures, 600 °C and 900 °C were utilized to control the N-doping level of the CSCNs; the N-content of CSCN processed at 600 °C is higher than that processed at 900 °C. After judicious activation process to fine-tune ultramicroporosity (<1 nm) by hot CO₂ treatment, the CSCN obtained from 600 °C with the most developed ultramicroporosity showed higher CO₂ uptake capacity compared to that of CSCN carbonized at 900 °C due to higher N-doping level, although the ultramicroporosity of the two samples is similar. In contrast, similar CH₄ sorption capacities were identified for these samples. In addition, very efficient and selective separation of CO₂/N₂ was achieved from CSCN carbonized at 600 °C with maximum ultramicroporosity; meanwhile, similar selective separations of CH₄/N₂ were observed for both of the most activated CSCNs. As a result, the relationship between the ultramicroporosity and CO₂ and CH₄ uptake capacities, and N-doping effect are clearly elucidated.

提出了高N掺杂的蟹壳来源的碳纳米纤维（CSCN），具有增强的CO ₂和CH ₄吸附能力。两种不同的碳化温度分别为600°C和900°C，以控制CSCN的N掺杂水平。在600°C下处理的CSCN的N含量高于在900°C下处理的CSCN的N含量。经过明智的活化过程以通过热CO ₂处理微调超微孔（<1 nm），与在900°C碳化的CSCN相比，从600°C获得的具有超微孔最发达的CSCN具有更高的CO ₂吸收能力。尽管两个样品的超微孔率相似，但N掺杂水平较高。相反，类似的CH ₄确定了这些样品的吸附能力。另外，在最大超微孔率下，从在600°C下碳化的CSCN中，可以非常有效地选择性分离出CO ₂ / N ₂。同时，对于两个活化最强的CSCN，观察到相似的CH ₄ / N ₂选择性分离。结果，清楚地阐明了超微孔度与CO ₂和CH ₄吸收能力以及N掺杂效应之间的关系。