Volume 21, Issue 2, 2012
Letter: POLYETHYLENIMINE-SILICA MESOPOROUS HYBRID: A NOVEL ADSORBENT FOR CO2 CAPTURE
aCollege of Chemistry and Life Science, Weinan Teachers University, Weinan 714000, PR China,
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Received: 30 November 2011; 30 March 2012
A facile pathway has been developed to synthesize polyethylenimine-modified mesoporous hybrid materials with highly efficient CO2 capturer. It is the special feature of this pathway that there are no surfactants introduced and the amine guest can be dispersed within the channels of the silica materials during the hydrolysis and polycondensation process. The obtained materials exhibit high specific surface areas, high porosity and high CO2 uptake. The amount of polyethylenimine (PEI) has important effect on the surface area, pore size and CO2 adsorption capacity of the adsorbents. For the sample containing 50 wt% PEI, the adsorbent exhibits a high adsorption capacity of 186.6 mg/g-PEI, and in situ FTIR show that CO2 is sorbed on amine sites through the formation of alkylammonium carbamates. The adsorbed CO2 could be desorbed completely from the sample at 150 oC. Moreover, the adsorbents show a stable cyclic adsorption-desorption performance.
Keywords:CO2 adsorbent; Adsorption; Polyethyleniminee.