Abstract For effective capture of low-level indoor CO2, a polyacrylonitrile (PAN) solution was doped with potassium hydroxide (KOH) before electrospinning to increase the specific surface area and microporosity of the resulting activated carbon nanofiber (ANF). Additionally, the KOH-doped ANF was treated with tetraethylenepentamine (TEPA) in ethanol to introduce nitrogen functionalities favorable for CO2 adsorption on the surface. The sequential improvements of the physical and chemical properties of ANF were carried out at a PAN: KOH mass ratio of 1:0−0.05 and TEPA solution concentrations of 1, 2, and 3%. The effects of KOH and TEPA on the structure and chemical properties were investigated using a Monosorb instrument, a field-emission scanning electron microscope, a thermogravimetric analyzer, and an x-ray photoelectron spectrometer. In terms of the textural improvements resulting from KOH doping, a sample of 0.03-ANF showed a significant increase in specific surface area: from 94.59 for pristine ANF to 469.09 m2/g after treatment. The XPS(X-ray photoelectron spectroscopy) examinations also showed a large increase in the content of the nitrogen-containing functional groups on the sample treated with TEPA, thereby increasing the selective adsorption capacity of 0.3% CO2 by 21-fold. The combination of textural enhancement by KOH impregnation and surface chemistry enhancement provided by the TEPA doping improved the low-level CO2 capture capability of ANF.

中文翻译：

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活性炭纤维性能的连续改进以提高室内二氧化碳的去除效率

摘要 为了有效捕获室内低浓度 CO2，在静电纺丝前在聚丙烯腈 (PAN) 溶液中掺杂氢氧化钾 (KOH)，以增加所得活性炭纳米纤维 (ANF) 的比表面积和微孔率。此外，KOH 掺杂的 ANF 在乙醇中用四亚乙基五胺 (TEPA) 处理，以引入有利于表面吸附 CO2 的氮官能团。ANF 物理和化学性质的连续改进是在 PAN:KOH 质量比为 1:0-0.05 和 TEPA 溶液浓度为 1%、2% 和 3% 的情况下进行的。使用 Monosorb 仪器、场发射扫描电子显微镜、热重分析仪和 X 射线光电子能谱仪研究了 KOH 和 TEPA 对结构和化学性质的影响。就 KOH 掺杂带来的质地改善而言，0.03-ANF 样品的比表面积显着增加：从原始 ANF 的 94.59 增加到处理后的 469.09 平方米/克。XPS（X 射线光电子能谱）检测还显示，经 TEPA 处理的样品上含氮官能团的含量大幅增加，从而将 0.3% CO2 的选择性吸附能力提高了 21 倍。KOH 浸渍的纹理增强和 TEPA 掺杂提供的表面化学增强相结合，提高了 ANF 的低水平 CO2 捕获能力。XPS（X 射线光电子能谱）检测还显示，经 TEPA 处理的样品上含氮官能团的含量大幅增加，从而将 0.3% CO2 的选择性吸附能力提高了 21 倍。KOH 浸渍的纹理增强和 TEPA 掺杂提供的表面化学增强相结合，提高了 ANF 的低水平 CO2 捕获能力。XPS（X 射线光电子能谱）检测还显示，经 TEPA 处理的样品上含氮官能团的含量大幅增加，从而将 0.3% CO2 的选择性吸附能力提高了 21 倍。KOH 浸渍的纹理增强和 TEPA 掺杂提供的表面化学增强相结合，提高了 ANF 的低水平 CO2 捕获能力。