Capture of CO2 from flue gas via multiwalled carbon nanotubes

Fengsheng Su, Chungsying Lu*, Wenfa Cnen, Hsun-Ling Bai, Jyh Feng Hwang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

213 Scopus citations

Abstract

Carbon nanotubes (CNTs) were modified by 3-aminopropyl-triethoxysilane (APTS) solution and were tested for its CO2 adsorption potential at multiple temperatures (20-100 °C). The physicochemical properties of CNTs were changed after the modification, which makes CNTs adsorb more CO2 gases. The adsorption capacities of CO2 via CNTs and CNTs(APTS) decreased with temperature indicating the exothermic nature of adsorption process and increased with water content in air at 0-7%. The mechanism of CO2 adsorption on CNTs and CNTs(APTS) appears mainly attributable to physical force regardless of temperature change, which makes regeneration of spent CNTs at a relatively low temperature become feasible. The CNTs(APTS) have good adsorption performance of CO2 at 20 °C as compared to many types of modified carbon or silica adsorbents documented in the literature. This suggests that the CNTs(APTS) are promising low-temperature adsorbents for CO2 capture from flue gas.

Original languageEnglish
Pages (from-to)3017-3023
Number of pages7
JournalScience of the Total Environment
Volume407
Issue number8
DOIs
StatePublished - 1 Apr 2009

Keywords

  • Amine functional groups
  • Carbon nanotubes
  • CO adsorption
  • Moisture
  • Surface modification
  • Temperature

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