Preparation and CO2 adsorption performance of PAN/PI-based porous carbon fibers
A polyacrylonitrile(PAN)/polyamidic acid(PAA)blend spinning solution was synthesized by adding biphenyltet-racarboxylic anhydride and diaminodiphenyl ether to PAN/dimethyl sulfoxide solution,followed by wet spinning,pre-oxidation/imidization in air atmosphere and carbonization in nitrogen(N2)atmosphere to prepare PAN/polyimide(PI)based porous car-bon fibers with a lotus root shaped cross-section.The apparent morphology,chemical structure and element composition of PAN/PI-based porous carbon fibers with different PI contents were studied.And the carbon dioxide(CO2)adsorption performance of porous carbon fibers was evaluated in simulated flue environment.The results showed that as the PI content increased,the pores in the fibers became larger and denser,forming a lotus root shaped cross-section structure;the pyrrole/pyridine nitrogen content also increased regularly with the increase of PI content,and the proportion of pyrrole/pyridine nitrogen reached 70.46%in the N structural forms of PAN/PI based porous carbon fibers when the PI mass fraction was 30%;and PAN/PI based porous carbon fi-bers with a PI mass fraction of 30%had the maximum CO2 adsorption capacity up to 0.66 mmol/g and could achieve adsorption equilibrium more quickly,demonstrating an excellent CO2 adsorption performance,in a simulated flue environment of a CO2 vol-ume fraction of 15%and N2 volume fraction of 85%at 40℃.
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