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Qi, G., Wang, Y., Estevez, L., Duan, X., Anako, N., Park, A.A., Li, W., Jones, C.W. and Giannelis, E.P. (2011) High Efficiency Nanocomposite Sorbents for CO2 Capture Based on Amine-Functionalized Mesoporous Capsules. Energy & Environmental Science, 4, 444-452.

has been cited by the following article:

• TITLE: Adsorption of CO2 on Polyethyleneimine 10k—Mesoporous silica Sorbent: XPS and TGA Studies

  AUTHORS: M. M. Khader, M. J. Al-Marri, Sardar Ali, G. Qi, E. P. Giannelis

  KEYWORDS: XPS, Adsorption Isotherm of CO2, Polyethyleneimine 10k, Mesoporous silica

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.6 No.4, March 6, 2015

  ABSTRACT: A CO2 solid sorbent based on polyethyleneimine 10k (PEI-10k) impregnated into mesoporous silica (MPS) foam was synthesized and utilized to capture CO2 at temperatures ranged from 65°C to 95°C. The calculated nitrogen and carbon contents in the bulk of the PEI-10k/MPS sorbent were similar to the XPS results measured on the surface of the foam, suggesting that the PEI was homo-geneously distributed throughout the MPS support. After CO2 adsorptionthe N 1s peak was broadened and could be resolved into two components: a high binding energy component (~401 eV) and a lower binding energy one (396 eV), respectively. The former nitrogen states are consistent with a protonated amine, presumably, due to carbamate formation. The lower binding energy component (~396 eV) could possibly be due to strongly chemisorbed CO2. The maximum sorption capacity was about 4 mmole CO2/g sorbent at 85°C and 1 bar. This capacity was doubled by raising the CO2 pressure to 24.95 bars. The adsorption results can be described by a Langmuir adsorption isotherm.