Abstract
Organo-modified mesoporous silica SBA-15 has been studied for sorption of carbon dioxide (CO2). The SBA-15 sample was functionalized with a branched chain polymer, polyethylenimine (PEI), of different molecular weights (1,300 and 2,000 g mol−1). Surface modification was carried out by impregnation of silica by PEI or by grafting with (3-chloropropyl)triethoxysilane, followed by substitution of chlorine atoms by PEI ligands. The prepared modified mesoporous materials were characterized by nitrogen adsorption/desorption at 77 K, high-resolution transmission electron microscopy, small-angle X-ray scattering, and thermal methods. Sorption of CO2 was studied by gravimetric method at 303 K. The total amount of sorbed CO2 varied between 0.19–0.67 mmol/g for respective samples. Regeneration of the materials after adsorption was achieved by thermal treatment at 343 K.
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Acknowledgments
This work was supported in part by the European Community STREP project “DeSANNS” (no. FP6-SES6-020133), the Slovak Research and Development Agency under contract RPEU-0027-06 (OrNaMat), the VEGA project (no. 1/0119/08) of the Ministry of Education of the Slovak Republic, and grant VVGS PF 14/2009/CH. The ERDF EU (Operational Program “Research and Development” financed through European Regional Development Fund) grant, under contract ITMS 26220120019 (Centre of Excellence of Advanced Materials with Nano, and Submicron, Structure) is also gratefully acknowledged. The authors thank Dr. U. Vainio (DESY/Hasylab, Hamburg, Germany) for assistance at the B1 beamline and Dr. N. Murafa (IIC AS CR, Rez, Czech Republic) for TEM measurements.
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Badaničová, M., Zeleňák, V. Organo-modified mesoporous silica for sorption of carbon dioxide. Monatsh Chem 141, 677–684 (2010). https://doi.org/10.1007/s00706-010-0304-6
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DOI: https://doi.org/10.1007/s00706-010-0304-6