2D/3D Assemblies of Amine-Functionalized Graphene Silica (Templated) Aerogel for Enhanced CO2 Sorption

Wenjing Wang, Julius Motuzas, Xiu Song Zhao, João C. Diniz Da Costa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This work investigates the one-pot facile synthesis of novel 2D/3D assemblies containing graphene silica (templated) aerogel sorbents for CO2 capture, a greenhouse gas of major global concern. In this synthesis, 3D silica (templated) aerogels were formed along the planes of 2D graphene sheets, resulting in 2D/3D assemblies of flake-like shapes. The templates were burnt off from the 2D/3D assembly, leaving a mesoporous cavity which increased with the carbon chain length used in the synthesis method. As such, morphological features related to surface area and total pore volume increased significantly by over 80% as compared to blank (no template) samples and reached maximum values of 734 m2 g-1 and 0.42 cm3 g-1, respectively. The increase in total pore volume allowed for higher content of impregnated amine into the 2D/3D assembly followed by a freeze-drying method. The CO2 sorption capacity of the amine-functionalized 2D/3D assemblies reached high values at 4.9 mmol g-1 (mass over weight ratio), equivalent to 11.67 mmol cm-3 (mass over total pore volume ratio). The amine-functionalized 2D/3D assemblies were stable over 10 cycles of CO2 sorption and desorption. Further, heat of sorption results were generally low, with the lowest value reaching 59 kJ mol-1. These results are desirable for the deployment of 2D/3D assemblies as sorbents to capture CO2

Original languageEnglish
Pages (from-to)30391-30400
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number33
DOIs
Publication statusPublished - 21 Aug 2019

Keywords

  • 2D/3D assembly
  • CO sorption
  • graphene
  • silica aerogel
  • template

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