Selective and Regenerative Carbon Dioxide Capture by Highly Polarizing Porous Carbon Nitride

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• 作者：Youngtak Oh ; Viet-Duc Le ; Uday Narayan Maiti ; Jin Ok Hwang ; Woo Jin Park ; Joonwon Lim ; Kyung Eun Lee ; Youn-Sang Bae ; Yong-Hyun Kim ; Sang Ouk Kim
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：9
• 期：9
• 页码：9148-9157
• 全文大小：685K
• ISSN：1936-086X

文摘

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路g^鈥?) 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.