Synthesis and evaluation of carbon nanotubes composite adsorbent for CO2 capture: a comparative study of CO2 adsorption capacity of single-walled and multi-walled carbon nanotubes

Keren Osler, Dhruti Dheda, Jacob Ngoy, Nicola Wagner, Michael O. Daramola

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

As a preliminary investigation towards obtaining carbon nanotube composite adsorbent for CO2 capture, in this study CO2 adsorption performance of three commercial carbon nanotubes (CNTs) one single-walled carbon nanotubes (SWCNTs), and two (2) different multi-walled carbon nanotubes (referred to as A-MWCNTs and B-MWCNTs) were evaluated and compared. The purpose of this study was to compare the different types of CNTs and select the best to serve as the solid anchor in the development of a hydrophobic composite adsorbent material for CO2 capture. The N2 physi-sorption of the CNTs was conducted to determine their surface area, pore volume and pore size. In addition, morphology and purity of the CNTs were checked with Transmission Electron Microscopy and Raman Spectroscopy, respectively. The CO2 adsorption capacity of the CNTs was evaluated using Thermo-gravimetric analysis (TGA) at 1.1 bar, at operating temperature ranged from 25 to 55 °C and at different CO2 feed flow rates, in order to evaluate the effects of these variables on the CO2 adsorption capacity. The results of CO2 adsorption with the TGA show that CO2 adsorption capacity for both SWCNTs and MWCNTs was the highest at 25 °C. Changing the CO2 flowrates had no significant effect on the adsorption capacity of MWCNTs, but decreasing the CO2 flow rate resulted in the enhancement of the CO2 adsorption capacity of SWCNTs. Overall, it was found that the SWCNTs displayed the highest CO2 adsorption capacity (29.97 gCO2/kg adsorbent) when compared to the MWCNTs (12.09 gCO2/kg adsorbent), indicating a 150% increase in adsorption capacity over MWCNTs.

Original languageEnglish
Pages (from-to)41-49
Number of pages9
JournalInternational Journal of Coal Science and Technology
Volume4
Issue number1
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Adsorption
  • CO Capture
  • Carbon nanotubes
  • Multi-walled nanotubes
  • Single-walled nanotubes

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

Fingerprint

Dive into the research topics of 'Synthesis and evaluation of carbon nanotubes composite adsorbent for CO2 capture: a comparative study of CO2 adsorption capacity of single-walled and multi-walled carbon nanotubes'. Together they form a unique fingerprint.

Cite this