以KOH为活化剂制备了比表面积大于2000 m2/g的高比表面积PAN基活性炭毡(ACF).以液氮为吸附介质在77.4 K测试PAN-ACF吸附等温线,并对其孔结构进行了表征.采用BET法计算比表面积,t-plot法、Horvath-Kawazoe、Dubinin-Radushkevich方程以及密度函数理论(DFT)表征孔结构.研究表明即使比表面积超过3000 m2/g时,PAN-ACF的孔分布仍然很窄,并且含有大量的分子筛型孔.以金子克美等人提出多段吸附机理为依据,采用DR方程对PAN-ACF三段吸附过程所对应的E0、x进行了计算.结果认为低压段的负偏离在一定程度上是由于吸附势较强的微孔与表面官能团共同作用的结果,并非完全由于活化扩散引起.以上分析方法的表征结果具有较好的一致性,为PAN-ACF的吸附性能与孔结构提供了准确的信息.
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