Rational design of β-cyclodextrins-derived hierarchically porous carbons for CO2 capture: The roles of surface chemistry and porosity on CO2 capture.

CO 2 capture, storage and utilization (CCSU) is the most promising strategy for ameliorating the ever-increasing atmospheric CO 2 concentrations problem. The development of advanced porous solid adsorbents for efficient CCSU is a burgeoning interest in materials science. Currently, porous carbon-based adsorbents face the major challenge of balancing the structural features of porosity and surface chemistry for CCSU in a durable and scalable material. To this end, we designed hierarchically porous carbons with tailorable porosity and adjustable surface chemistry, and clarify the influence of porosity and surface chemistry on CO 2 capture. Meanwhile, the systematic study revealed the synergetic effect of microporosity of less than 10 Å and surface chemistry on CO 2 capture, and the synergistic effect mechanism of various surface groups on CO 2 capture property was also ascertained in detail. Porosity was found to be the determinant role on CO 2 capture, in particular the microporosity of < 10 Å and ultramicroporosity of < 7.0 Å. While, surface chemistry played a significant role on the improvement of CO 2 capture, especially the CO 2 /N 2 selectivity at higher temperature. Importantly, this work provided an instructive guideline for rational design of high-efficient porous carbon CO 2 adsorbents with a balanced porosity and surface chemistry property. ● Hierarchically porous carbon with tailorable porosity and surface chemistry was obtained. ● The effect of porosity and surface chemistry on CO 2 capture was clarified. ● The synergistic effect mechanism of various surface groups was ascertained. ● An instructive guideline for rational design of porous carbon adsorbents was provided. [ABSTRACT FROM AUTHOR]