Commercial Kevlar derived activated carbons for CO2 and C2H4 sorption

The carbonaceous precursor was obtained via pyrolysis of commercial aramid polymer (Kevlar). Additionally the precursor was activated at 1000 degrees C in CO2 atmosphere for different times. Obtained materials were characterised by BET; XPS; SEM and optical microscopy. The sorption capacities were determined by temperature swing adsorption performed in TGA apparatus for CO2 and C2H4 gases. The obtained materials exhibit high difference in sorption of these gases i.e. 1.5 and 2.8 mmol/g @30 degrees C respectively and high SSA similar to 1600 m(2)/g what can be applied in separation applications. The highest uptakes were 1.8 and 3.1 mmol/g @30 degrees C respectively. It was found that the presence of oxygen and nitrogen functional groups enhances C2H4/CO2 uptake ratio.