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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (04): 985-992    DOI: 10.3866/PKU.WHXB201202071
Adsorption Capacity of Carbon Dioxide on Amine Modified Mesoporous Materials with Larger Pore Sizes
ZHAO Hui-Min, LIN Dan, YANG Gang, CHUN Yuan, XU Qin-Hua
Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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Abstract  Mesoporous silica SBA-15-like materials with large pores were synthesized using tri-block copolymer P123 as a structure-directing agent, tetramethoxysilane as the silicon source, and different organic solvents as swelling agents. The resulting materials were characterized by powder X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The results showed that the introduction of swelling agents effectively enlarged the pore diameter and pore volume of the SBA-15 materials, and pore swelling with isooctane was larger than that with CCl4. When modified with tetraethylenepentamine (TEPA), all of these composite materials exhibited excellent adsorption capacities for CO2. The adsorption capacity of CO2 was independent of the pore structure, if the template was removed before modification with TEPA. By contrast, the adsorption capacity increased with the pore diameter when the as-synthesized mesoporous material was modified with TEPA. The effects of temperature and pressure on the CO2 adsorption capacity were investigated using adsorption isotherms and CO2 temperature-programmed desorption (TPD). With CO2 adsorption at higher temperature, the composite materials showed different adsorption capacities with pressure variation. As a result, the adsorption and separation of CO2 on these TEPA modified mesoporous materials in ambient air flow can be realized via pressure swing adsorption.

Key wordsSwelling agent      Mesoporous materials      CO2      Pressure swing adsorption      Template      Tetraethylenepentamine     
Received: 01 September 2011      Published: 07 February 2012
MSC2000:  O647  

The project was supported by the National High-Tech Research and Development Program of China (863) (2008AA06Z327), Fundamental Research Funds for the Central Universities, China (1116020503), and Testing Fund of Nanjing University, China (0205001330).

Corresponding Authors: CHUN Yuan     E-mail:
Cite this article:

ZHAO Hui-Min, LIN Dan, YANG Gang, CHUN Yuan, XU Qin-Hua. Adsorption Capacity of Carbon Dioxide on Amine Modified Mesoporous Materials with Larger Pore Sizes. Acta Phys. Chim. Sin., 2012, 28(04): 985-992.

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