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Date of Publication:2001-01-01

Journal:物理化学学报

Affiliation of Author(s):化工学院

Volume:17

Issue:3

Page Number:216-221

ISSN No.:1000-6818

Abstract:A new method of liquid impregnation combining air oxidition is employed to modify the surface and pore structure of PAN-based activated carbon (PAN-ACF) under moderate condition.By this method,a molecular sieve type PAN-ACF is prepared having high selectivity to separate N2 from O2.TGA DGA,electronic balance and XPS are used to characterize the performance and surface chemistry of the samples.The results show that PAN-ACF impregnated with condensed coal tar has a slight weight loss during 100～ 400 ℃ ,the benzenoid and heterocyclic compound graft with carbon fiber by the aid of oxygen molecule to tailor the pore and surface structure of fibers.After oxidizing by air,the selectivity and adsorptive capacity of PAN-ACF are improved significantly,the selectivity reaches 5.6 of N2/O2.There are many kinds of function group such as hydroxyl group,ether,carbonyl and carboxyl after the impregnation of PAN-ACF with condensed coal tar and oxidized by air,during oxidition the content of various function group changes,graphite-like carbon increases with the increase of impregnated concentration.

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