Journal
RSC ADVANCES
Volume 4, Issue 100, Pages 56707-56712Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra09314c
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Funding
- National Research Foundation (NRF) - Korean Government's Ministry of Science, ICT, and Future Planning [2012-008941]
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Amine-modified graphite oxides (GAs) for CO2 adsorption were prepared using 3-aminopropyltriethoxysilane. Graphite was first oxidized using highly concentrated acid, and then modified with the amine using a solvent-assisted method. Ethanol and water were used as the solvents, and the solvent effects were investigated. The morphological changes, functionalities, and compositions of the GAs were characterized by scanning electron microscopy, Fourier-transform infrared and X-ray photoelectron spectroscopies, and elemental analysis. The CO2 adsorption behavior was evaluated by thermogravimetric analysis at 30 degrees C under atmospheric pressure. The GA prepared in water (GA-W) had a higher CO2 adsorption uptake (1.64 mol kg(-1)) than did the GA prepared in ethanol (1.31 mol kg(-1)). The amine loading was predominantly influenced by the solvent, and water was an effective solvent for amine modification. GA-W also showed good regenerability in repeated adsorption-desorption cycles with high adsorption/desorption rates.
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