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Issue 8, 2014
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An efficient one-step condensation and activation strategy to synthesize porous carbons with optimal micropore sizes for highly selective CO2 adsorption

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Abstract

A series of microporous carbons (MPCs) were successfully prepared by an efficient one-step condensation and activation strategy using commercially available dialdehyde and diamine as carbon sources. The resulting MPCs have large surface areas (up to 1881 m2 g−1), micropore volumes (up to 0.78 cm3 g−1), and narrow micropore size distributions (0.7–1.1 nm). The CO2 uptakes of the MPCs prepared at high temperatures (700–750 °C) are higher than those prepared under mild conditions (600–650 °C), because the former samples possess optimal micropore sizes (0.7–0.8 nm) that are highly suitable for CO2 capture due to enhanced adsorbate–adsorbent interactions. At 1 bar, MPC-750 prepared at 750 °C demonstrates the best CO2 capture performance and can efficiently adsorb CO2 molecules at 2.86 mmol g−1 and 4.92 mmol g−1 at 25 and 0 °C, respectively. In particular, the MPCs with optimal micropore sizes (0.7–0.8 nm) have extremely high CO2/N2 adsorption ratios (47 and 52 at 25 and 0 °C, respectively) at 1 bar, and initial CO2/N2 adsorption selectivities of up to 81 and 119 at 25 °C and 0 °C, respectively, which are far superior to previously reported values for various porous solids. These excellent results, combined with good adsorption capacities and efficient regeneration/recyclability, make these carbons amongst the most promising sorbents reported so far for selective CO2 adsorption in practical applications.

Graphical abstract: An efficient one-step condensation and activation strategy to synthesize porous carbons with optimal micropore sizes for highly selective CO2 adsorption

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Publication details

The article was received on 01 Nov 2013, accepted on 20 Jan 2014 and first published on 24 Jan 2014


Article type: Paper
DOI: 10.1039/C3NR05825E
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2014,6, 4148-4156
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    An efficient one-step condensation and activation strategy to synthesize porous carbons with optimal micropore sizes for highly selective CO2 adsorption

    J. Wang and Q. Liu, Nanoscale, 2014, 6, 4148
    DOI: 10.1039/C3NR05825E

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