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Catalyst‐Free Synthesis of Porous Graphene Networks as Efficient Sorbents for CO 2 and H 2
Author(s) -
Song Kyung Seob,
Coskun Ali
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201500061
Subject(s) - graphene , catalysis , covalent bond , thermal stability , selectivity , surface modification , amine gas treating , materials science , bar (unit) , tandem , chemistry , chemical engineering , nanotechnology , organic chemistry , physics , meteorology , engineering , composite material
Reported is a catalyst‐free synthetic route for the preparation of porous graphene networks (PGNs) incorporating benzimidazole linkages through the condensation reaction between ester‐functionalized graphene sheets and organic aromatic amine linkers. PGNs showed remarkable thermal stability at temperatures of up to 350 °C in air. This emphasizes the importance of the formation of robust CC bonds by means of the Johnson–Claisen rearrangement for the covalent functionalization of graphene layers. PGNs exhibited high surface areas up to 732 m 2 g −1 and showed the highest CO 2 uptake capacity (3.75 mmol g −1 at 273 K, 1 bar) along with a remarkable CO 2 /N 2 selectivity (130 at 273 K, 1 bar) of all the GO and graphene frameworks reported to date. PGNs as low‐cost, efficient solid sorbents also exhibited high affinity towards H 2 (1.2 wt % at 77 K, 1 bar).