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Surface chemistry of polyacrylonitrile- and rayon-based activated carbon fibers after post-heat treatment

机译：热处理后的聚丙烯腈和人造丝基活性炭纤维的表面化学

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摘要

Polyacrylonitrile- and rayon-based activated carbon fibers (ACFs) subject to heat treatment were investigated by means of elemental analyzer, and X-ray photoelectron spectroscopy (XPS). The total ash content of all ACFs was also analyzed. The adsorption of benzene, carbon tetrachloride and water vapor on ACFs was determined to shed light on the role of surface chemistry on gas adsorption. Results show that different precursors resulted in various elemental compositions and imposed diverse influence upon surface functionalities after heat treatment. The surface of heat-treated ACFs became more graphitic and hydrophobic. Three distinct peaks due to C, N, and O atoms were identified by XPS, and the high-resolution revealed the existence of several surface functionalities. The presence of nitride-like species, aromatic N-imines, or chemisorbed nitrogen oxides was found to be of great advantage to adsorption of water vapor or benzene, but the pyridine-N was not. Unstable complexes on the surface would hinder the fibers from adsorption of carbon tetrachloride. The rise in total ash content or hydrogen composition was of benefit to the access of water vapor. Modifications of ACFs by heat treatment have effectively improved adsorption performance.
机译：借助元素分析仪和X射线光电子能谱（XPS）对经过热处理的聚丙烯腈和人造丝基活性炭纤维（ACF）进行了研究。还分析了所有ACF的总灰分含量。测定苯，四氯化碳和水蒸气在ACF上的吸附，以阐明表面化学对气体吸附的作用。结果表明，不同的前体会导致各种元素组成，并对热处理后的表面功能产生不同的影响。热处理过的ACF的表面变得更加石墨化和疏水。 XPS鉴定了由于C，N和O原子而产生的三个不同的峰，并且高分辨率显示了几种表面官能团的存在。发现存在类似氮化物的物质，芳族N-亚胺或化学吸附的氮氧化物对水蒸气或苯的吸附具有很大的优势，而吡啶-N则不然。表面上不稳定的络合物会阻碍纤维吸附四氯化碳。总灰分含量或氢组成的增加有利于水蒸气的进入。通过热处理对ACF进行改性可有效改善吸附性能。

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