Adsorption equilibrium of organic vapors on single-walled carbon nanotubes

Sandeep Agnihotri, Mark J. Rood, Massoud Rostam-Abadi

Research output: Contribution to journalArticlepeer-review

Abstract

Gravimetric techniques were employed to determine the adsorption capacities of commercially available purified electric arc and HiPco single-walled carbon nanotubes (SWNTs) for organic compounds (toluene, methyl ethyl ketone (MEK), hexane and cyclohexane) at relative pressures, p/p0, ranging from 1 × 10-4 to 0.95 and at isothermal conditions of 25, 37 and 50 °C. The isotherms displayed both type I and type II characteristics. Adsorption isotherm modeling showed that SWNTs are heterogeneous adsorbents, and the Freundlich equation best describes the interaction between organic molecules and SWNTs. The heats of adsorption were 1-4 times the heats of vaporization, which is typical for physical adsorption of organic vapors on porous carbons.

Original languageEnglish (US)
Pages (from-to)2379-2388
Number of pages10
JournalCarbon
Volume43
Issue number11
DOIs
StatePublished - Sep 2005

Keywords

  • Adsorption
  • Carbon nanotubes
  • Organic

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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