论文部分内容阅读
以膨胀石墨(expanded graphite,EG)为基体、蔗糖为炭源、磷酸为活化剂,采用一步浸渍活化工艺制得了微-纳米孔碳质材料(micro/nano-porous carbon,MNC)。采用X射线衍射仪、扫描电子显微镜、透射电镜、氮气吸附及孔径分析仪和压汞法对材料的结构进行了表征。结果表明:MNC由EG和活性炭组成,活性炭以炭膜的形式均匀涂覆在EG的内外孔孔壁上,厚度约为100nm;其孔隙结构不仅包括来自EG的微米级大孔,还有来自活性炭的纳米级微孔。随着浸渍比、活化温度和活化时间的增加,MNC先形成微孔,此后逐渐扩孔从而导致中孔大量出现,MNC的比表面积和总孔容在浸渍比为0.9、活化温度为350℃和活化时间为2h时分别达到最大(1978m2/g和0.99cm3/g)。
Micro / nano-porous carbon (MNC) was prepared by one-step impregnation activation using expanded graphite (EG) as substrate, sucrose as carbon source and phosphoric acid as activator. The structure of the material was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption and pore size analyzer and mercury intrusion porosimetry. The results showed that MNC consisted of EG and activated carbon. Activated carbon was uniformly coated on the inner and outer walls of EG with a thickness of about 100 nm in the form of a carbon membrane. The pore structure included not only micron-sized macropores from EG but also activated carbon Nanometer micropore. With the increase of impregnation ratio, activation temperature and activation time, MNC first formed micropores, and then gradually expanded to produce a large number of mesopores. The specific surface area and total pore volume of MNC were improved at the impregnation ratio of 0.9 and the activation temperature of 350 ℃ The activation time reached the maximum at 2h (1978m2 / g and 0.99cm3 / g) respectively.