EB 预辐照对制备 PANACF 表面形貌的影响

摘要

提出了利用电子束(electron beam,EB)预辐照聚丙烯腈基纤维(polyacrylonitrile-based fiber,PANF)后再进行炭化活化制备聚丙烯腈基活性炭纤维(polyacrylonitrile-based activated carbon fiber,PANACF)的方法。吸收剂量为160 kGy 并用 w =10%KOH 溶液浸渍30 min 的 PANF 在450℃下模拟炭化活化30 min后,SEM 分析显示其表面出现了与未辐照 PANF 不同的密集的蜂巢状结构,其 BET 法比表面积(specific sur-face area,SSA)约为未辐照样品的9倍,BJH 法计算结果显示其为孔径分布集中在2~10 nm 的介孔材料。该结果表明,EB 预辐照对制备 PANACF 的表面形貌具有调控作用。%A new method was used to fabricate the polyacrylonitrile-based activated carbon fiber (PANACF)by the electron beam (EB)pre-irradiation in this paper.The polyacryloni-trile-based fiber (PANF)was irradiated by EB and its accumulated absorbed dose was 1 60 kGy,and then it was dipped in the 10% KOH solution for 30 min,after that,it was placed into the furnace under nitrogen protection for carbonization at 450 ℃ for 30 min.The analysis result of scanning electron microscope (SEM) shows that the surface of pre-irradiated PANACF appears dense honeycomb structure,which is very different with the un-irradiated PANACF.Moreover,the specific surface area (SSA)of pre-irradiated PANACF is about 9 times larger than the un-irradiated sample’s (SSA was calculated by the BET method).The BJH results reveal that the PANACF prepared by EB pre-irradiation is a novel mesoporous structure,and its pore size distribution is focused on the range from 2 nm to 10 nm.The preliminary research results indicate that the surface morphology of PANACF can be controlling by EB pre-irradiation.