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

Abstract

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.

A Hierarchical Z‑Scheme α‐Fe2O3/g‐C3N4 Hybrid for Enhanced Photocatalytic CO2 Reduction

“…For CO 2 molecular adsorption, g‐C 3 N 4 exhibits relatively weak CO 2 affinity ( E ads = −0.317 eV). In general, the typical adsorption sites for g‐C 3 N 4 can be mainly attributed to its tertiary N site . Nevertheless, the limited van der Waals contact areas endow the tertiary N sites unfavorable for CO 2 adsorption, which is consistent with the low CO 2 desorption temperature of g‐C 3 N 4 in the TPD experiment.…”

Carbon Solving Carbon's Problems: Recent Progress of Nanostructured Carbon‐Based Catalysts for the Electrochemical Reduction of CO2

“…[69,70] Through an induced dipole interaction, g-C 3 N 4 can effectively polarise CO 2 molecules, leading to enhanced adsorption which could facilitate the CO 2 RR process. As a result, carbon nitride has been coupled with multi-walled carbon nanotubes (MWCNTs) and used as electrocatalysts for the CO 2 RR, demonstrating high selectivity towards CO production.…”

Metal‐Organic Framework as a Protective Coating for Biodiagnostic Chips

“…[10] These attractive properties render MOFs promising materials for a variety of applications in gas storage,[11] drug delivery,[12] catalysis,[13] and chemical sensors. [14] Within the different emerging applications, a recent study demonstrated the encapsulation of a wide range of biomolecules within MOFs by growing them in the presence of the biomolecules under mild biocompatible conditions (e.g., aqueous solution at room temperature).…”