Selective and Regenerative Carbon Dioxide Capture by Highly Polarizing Porous Carbon Nitride.
Energy-efficient CO2 capture is a stringent demand for green and sustainable energy supply. Strong adsorption is desirable for high capacity and selective capture at ambient conditions but unfavorable for regeneration of adsorbents by a simple pressure control process. Here we present highly regenerative and selective CO2 capture by carbon nitride functionalized porous reduced graphene oxide aerogel surface. The resultant structure demonstrates large CO2 adsorption capacity at ambient conditions (0.43 mmol·g(-1)) and high CO2 selectivity against N2 yet retains regenerability to desorb 98% CO2 by simple pressure swing. First-principles thermodynamics calculations revealed that microporous edges of graphitic carbon nitride offer the optimal CO2 adsorption by induced dipole interaction and allows excellent CO2 selectivity as well as facile regenerability. This work identifies a customized route to reversible gas capture using metal-free, two-dimensional carbonaceous materials, which can be extended to other useful applications.
Youngtak
Y
Oh
Viet-Duc
VD
Le
Uday Narayan
UN
Maiti
Jin Ok
JO
Hwang
Woo Jin
WJ
Park
Joonwon
J
Lim
Kyung Eun
KE
Lee
Department of Chemical and Biomolecular Engineering, Yonsei University , Seoul 120-749, Korea.
Youn-Sang
YS
Bae
Yong-Hyun
YH
Kim
Sang Ouk
SO
Kim
CO2 capture; aerogel; carbon nitride; density functional theory; graphene