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Issue 40, 2017
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Acid/hydrazide-appended covalent triazine frameworks for low-pressure CO2 capture: pre-designable or post-synthesis modification

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Abstract

Pore surface engineering in nanoporous organic polymers (NOPs) targeted for their different applications remains a critical challenge. Here we compare two classic modification strategies, i.e. pre-designable and post-synthesis modification, which allow controlled loading of functionalities onto the pore wall by anchoring ethyl ester, acetic acid or acetohydrazides for effective CO2 capture. The pre-designed acetic acid-appended or acetohydrazide-appended precursors permit the construction of covalent triazine frameworks (CTF-CSU36@pre and CTF-CSU37@pre) with walls to which an exciting content of functional units is anchored. Conversely, channel functionalization is made possible by facile hydrolysis or hydrazide reaction of a carbazole-bridged triazine framework with pendant ethyl ester (CTF-CSU20) to produce surfaces with desired acetic acid (CTF-CSU36@post) or acetohydrazide groups (CTF-CSU37@post). High-degree dense integration of functional groups on the channel walls proved the superiority of the post-synthesis modification relative to the pre-designable strategy. Porous monoliths with high capacity at very low pressures (5.7 wt% at 273 K/0.15 bar), excellent IAST ideal selectivity (CO2/N2 = 145.9) and reusability were created, demonstrating their great potential for gas storage and separation. Significantly, such tailor-made pore-wall functional engineering could be a facile and powerful strategy for broad applications of NOPs.

Graphical abstract: Acid/hydrazide-appended covalent triazine frameworks for low-pressure CO2 capture: pre-designable or post-synthesis modification

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Publication details

The article was received on 21 Jun 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA05416E
Citation: J. Mater. Chem. A, 2017,5, 21266-21274
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    Acid/hydrazide-appended covalent triazine frameworks for low-pressure CO2 capture: pre-designable or post-synthesis modification

    Y. Fu, Z. Wang, X. Fu, J. Yan, C. Liu, C. Pan and G. Yu, J. Mater. Chem. A, 2017, 5, 21266
    DOI: 10.1039/C7TA05416E

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