Zhu Zhigao, Ma Jiaxiang, Ji Chenghan, Liu Yan, Wang Wei, Cui Fuyi
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology Harbin 150090 P. R. China
College of Urban Construction and Environmental Engineering, Chongqing University Chongqing 400044 P. R. China
RSC Adv. 2018 May 24;8(34):19116-19124. doi: 10.1039/c8ra02512f. eCollection 2018 May 22.
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, 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 g and a pore volume of 1.24 cm g, showing excellent adsorption capacity toward methylene blue (MeB, 2020 mg g). 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.
最近，人们付出了巨大努力来制备具有高比表面积（SSA）的廉价多孔碳材料，用作吸附剂或催化剂以有效去除有机污染物。在此，通过静电纺丝技术、聚合以及活化和碳化过程设计并构建了具有分级结构的活性多孔碳纤维。受益于前驱体纤维设计和后续活化技术，源自苯并恶嗪/聚丙烯腈（BA-a/PAN）前驱体的活性多孔碳纤维（APCFs）展现出2337.16 m²/g的超高比表面积和1.24 cm³/g的孔体积，对亚甲基蓝（MeB，2020 mg/g）表现出优异的吸附能力。有趣的是，预吸附MeB后的APCFs还能通过单线态氧对过一硫酸盐（PMS）进行有效活化，从而实现对MeB的超快去除。同时，利用APCFs的吸附和催化氧化反应的协同效应能够在相对较短的时间内实现出色的总有机碳（TOC）去除。此外，还提出了一种利用APCFs促进MeB去除的协同吸附-氧化机制。这项研究对于设计和开发具有超高比表面积的新型无金属碳吸附剂、催化剂或催化剂载体以用于各种应用具有重要意义。
