空气氧化对沥青基活性炭纤维的微孔结构、表面性质及CH4吸附性能的影响
Air oxidation effects on microporosity, surface property, and CH4 adsorptivity of pitch-based activated carbon fibers.
作者信息
Wang Z-M, Yamashita N, Wang Z-X, Hoshinoo K, Kanoh H
机构信息
Aquamaterial Separation Technology RG, Marine Resource and Environment Institute, National Institute of Advanced Industrial Science and Technology, 2217-14 Hayashi-cho, Takamatsu-shi, Kagawa 761-0395, Japan.
出版信息
J Colloid Interface Sci. 2004 Aug 1;276(1):143-50. doi: 10.1016/j.jcis.2004.03.017.
The changes in microporous structure and surface properties of pitch-based activated carbon fibers upon air oxidation were examined by high-resolution N2 adsorption and various physicochemical methods such as DTA, DRIFT, XPS, and chemical titration/analysis. It was found that air oxidation below 673 K slightly modifies the microporous structure together with a minor replacement of surface -C=O groups by -C-O groups. However, oxidation above 773 K gradually increases the specific surface area and the average width of micropores by producing micropores with larger widths and greatly induces the formation of surface functional groups, especially the -COOH group. A slight change in microporosities has an evident effect on CH4 storage property.
通过高分辨率N₂吸附以及诸如差示热分析（DTA）、漫反射红外傅里叶变换光谱（DRIFT）、X射线光电子能谱（XPS）和化学滴定/分析等各种物理化学方法，研究了沥青基活性炭纤维在空气氧化后微孔结构和表面性质的变化。结果发现，在673K以下进行空气氧化会轻微改变微孔结构，同时表面的-C=O基团会被-C-O基团少量取代。然而，在773K以上进行氧化会通过产生宽度更大的微孔逐渐增加比表面积和微孔的平均宽度，并极大地促使表面官能团的形成，尤其是-COOH基团。微孔率的轻微变化对CH₄储存性能有明显影响。
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