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Nitrogen doped hierarchically structured porous carbon fibers with an ultrahigh specific surface area for removal of organic dyes

机译：氮掺杂的分级结构多孔碳纤维，具有超高的比表面积，可去除有机染料

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Recently, tremendous efforts have been devoted to creating inexpensive porous carbon materials with a high specific surface area (SSA) as adsorbents or catalysts for the efficient removal of organic pollutants. Here, activated porous carbon fibers with hierarchical structures were designed and constructed by an electrospinning technique, in situ polymerization, and activation and carbonization processes. Benefiting from the precursor fiber design and subsequent activation techniques, the activated porous carbon fibers (APCFs) derived from a benzoxazine/polyacrylonitrile (BA-a/PAN) precursor exhibited an ultrahigh SSA of 2337.16 m ~(2) g ~(?1) and a pore volume of 1.24 cm ~(3) g ~(?1) , showing excellent adsorption capacity toward methylene blue (MeB, 2020 mg g ~(?1) ). Interestingly, the APCFs after pre-adsorption of MeB also display robust activation of peroxymonosulfate (PMS) with singlet oxygen for the ultrafast removal of MeB. Meanwhile, the synergistic effect of adsorption and a catalytic oxidation reaction using APCFs can realize outstanding total organic carbon (TOC) removal in a comparatively short time. Moreover, a synergistic adsorption–oxidation mechanism for promoting the removal of MeB using APCFs was proposed. This study is useful for the design and development of novel metal-free carbon adsorbents, catalysts or catalyst carriers with an ultrahigh SSA for various applications.
机译：近来，已经做出巨大的努力来创建具有高比表面积（SSA）的廉价多孔碳材料作为有效去除有机污染物的吸附剂或催化剂。在此，通过静电纺丝技术，原位聚合以及活化和碳化过程设计和构造了具有分层结构的活性多孔碳纤维。得益于前体纤维的设计和随后的活化技术，衍生自苯并恶嗪/聚丙烯腈（BA-a / PAN）前体的活化多孔碳纤维（APCF）的超高SSA为2331.76 m〜（2）g〜（？1）孔体积为1.24cm〜（3）g〜（Δ1），对亚甲基蓝（MeB，2020mgg〜（Δ1））具有优异的吸附能力。有趣的是，在预吸附MeB之后，APCF还显示了用单线态氧对过氧单硫酸盐（PMS）的强力活化，从而可以快速去除MeB。同时，使用APCF的吸附和催化氧化反应的协同作用可以在相对较短的时间内实现出色的总有机碳（TOC）去除。此外，提出了一种协同吸附-氧化机制，以促进使用APCF去除MeB。这项研究可用于设计和开发新型的无金属碳吸附剂，具有超高SSA的催化剂或催化剂载体，适用于各种应用。

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