Journal
CARBON
Volume 127, Issue -, Pages 245-254Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2017.11.007
Keywords
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Funding
- Natural Science Foundation of China [21772035]
- Key Project of Hunan Province Education Department [15A041]
- Talent Research Startup Fund of Hunan Institute of Engineering [16RC001]
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To optimize the synergistic effects among hydrogen bond donors, halogen anions and basic sites, we synthesized a series of graphene oxide (GO) materials multi-functionalized with silanol group, multicationic quaternary ammonium salt and tertiary amine in a one-pot approach. Hexamethylenetetramine which is cheap and rich with tertiary amine was used as precursor. As characterized by elemental analysis and X-ray photoelectron spectroscopy, the loading of quaternary ammonium salt and tertiary amine was up to 2.56 and 1.84 mmol/g, respectively. This is the first time that a multi-functionalized GO (MF-GO) enriched with multi-cationic quaternary ammonium salt was prepared and used for the cycloaddition of CO2 towards epoxides under mild conditions (90 degrees C, 2 MPa and 4 h) with high efficiency (TOF = 46.1 h(-1)) without the need of a solvent and a co-catalyst. The advantage of the combined use of the multi-cationic approach and multi-synergetic strategy was illustrated by comparing the performance of MF-GO with those of the GO samples that are endowed with different functional groups. A plausible mechanism is proposed for the cycloaddition reaction over MF-GO. Moreover, the MF-GO catalyst can be easily separated and reused for at least five times without significant loss of activity. (C) 2017 Elsevier Ltd. All rights reserved.
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