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Acta Phys. Chim. Sin.  2007, Vol. 23 Issue (06): 801-806    DOI: 10.1016/S1872-1508(07)60046-1
CO2 Capture by the Amine-modified Mesoporous Materials
ZHAO Hui-Ling; HU Jun; WANG Jian-Jun; ZHOU Li-Hui; LIU Hong-Lai
Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
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Abstract  Novel CO2 adsorbents were prepared by grafting of two different aminosilanes on mesoporous silica MCM-41 and SBA-15. The properties of the mesoporous materials before and after surface modification were investigated by powder X-ray diffraction (XRD) pattern, solid-state 29Si nuclear magnetic resonance (NMR), Fourier transforminfrared (FT-IR) spectra, and measurements of N2 adsorption and desorption isothermal, which confirmed that aminosilanes were grafted on the surface of the channels in the mesoporous materials. Thermogravimetry analysis (TGA) evaluated the amounts of grafted amine to be about 1.5-2.9 mmol·g-1. The CO2 adsorption capacities of MCM-41 increased from 0.67 mmol·g-1 to 2.20 mmol·g-1 after AEAPMDS (N-β-(aminoethyl)-γ-aminopropyl dimethoxy methylsilane) modification (p =101 kPa) at room temperature. The studies of the mechanism of CO2 adsorption suggested that there were two main contributions for the increase: the chemical adsorption based on the active sites of amine groups and the capillary condensation caused by the nano-scale channels of the mesoporous materials.

Key wordsMCM-41      SBA-15      Amine surface modification      Adsorption      CO2     
Received: 15 December 2006      Published: 27 April 2007
MSC2000:  O647  
Corresponding Authors: HU Jun     E-mail:
Cite this article:

ZHAO Hui-Ling; HU Jun; WANG Jian-Jun; ZHOU Li-Hui; LIU Hong-Lai. CO2 Capture by the Amine-modified Mesoporous Materials. Acta Phys. Chim. Sin., 2007, 23(06): 801-806.

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