Effective nitrogen and sulfur co-doped porous carbonaceous CO2 adsorbents derived from amino acid

In this work, N, S co-doped porous carbons were synthesized by a facile two-step synthesis strategy i.e. pyrolysis of the mixture of L-glutamic acid and thiourea followed by KOH activation. By adjusting the activation temperature and KOH amount, a series of sorbents with diverse porous and surface chemical properties were attained. These adsorbents exhibited maximum CO2 uptake of 3.54 and 5.54 mmol g(-1) at 1 bar, 25 degrees C and 0 degrees C, respectively. Further investigation proves that the joint effects of narrow microporosity, N and S content determine these adsorbents' CO2 adsorption capacity. Moreover, these carbons also possess multiple good CO2 adsorption properties such as stable recyclability, suitable heat of adsorption, fast adsorption kinetics, high CO2/N-2 selectivity, and good dynamic adsorption capacity. These results indicate that N, S codoped porous carbons prepared from L-glutamic acid are promising adsorbents in CO2 capture.

Automated summary

In this study, N, S co-doped porous carbons were synthesized using a two-step synthesis strategy, showing promising CO2 adsorption performance and application prospects.