CO2 adsorption on crystalline graphitic nanostructures

Mirian Elizabeth Casco, Aarón Morelos-Gómez, Sofia Magdalena Vega-Díaz, Rodolfo Cruz-Silva, Ferdinando Tristán-López, Hiroyuki Muramatsu, Takuya Hayashi, Manuel Martínez-Escandell, Mauricio Terrones, Morinobu Endo, Francisco Rodríguez-Reinoso, Joaquín Silvestre-Albero

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13 Scopus citations

Abstract

CO2 adsorption has been measured in different types of graphitic nanostructures (MWCNTs, acid treated MWCNTs, graphene nanoribbons and pure graphene) in order to evaluate the effect of the different defective regions/conformations in the adsorption process, i.e., sp3 hybridized carbon, curved regions, edge defects, etc. This analysis has been performed both in pure carbon and nitrogen-doped nanostructures in order to monitor the effect of surface functional groups on surface created after using different treatments (i.e., acid treatment and thermal expansion of the MWCNTs), and study their adsorption properties. Interestingly, the presence of exposed defective regions in the acid treated nanostructures (e.g., uncapped nanotubes) gives rise to an improvement in the amount of CO2 adsorbed; the adsorption process being completely reversible. For N-doped nanostructures, the adsorption capacity is further enhanced when compared to the pure carbon nanotubes after the tubes were unzipped. The larger proportion of defect sites and curved regions together with the presence of stronger adsorbent-adsorbate interactions, through the nitrogen surface groups, explains their larger adsorption capacity.

Original languageEnglish (US)
Pages (from-to)60-65
Number of pages6
JournalJournal of CO2 Utilization
Volume5
DOIs
StatePublished - Mar 2014

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology

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    Casco, M. E., Morelos-Gómez, A., Vega-Díaz, S. M., Cruz-Silva, R., Tristán-López, F., Muramatsu, H., Hayashi, T., Martínez-Escandell, M., Terrones, M., Endo, M., Rodríguez-Reinoso, F., & Silvestre-Albero, J. (2014). CO2 adsorption on crystalline graphitic nanostructures. Journal of CO2 Utilization, 5, 60-65. https://doi.org/10.1016/j.jcou.2014.01.001