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Synthesis, Characterization, and Carbon Dioxide Adsorption of Covalently Attached Polyethyleneimine-Functionalized Single-Wall Carbon Nanotubes

Traditional materials used to remove CO2 sequestration rely on either chemical reaction or porosity. While chemical adsorbents are selective they require significant energy to release the CO2 for reuse or storage. Reaction of fluorinated-SWNTs with polyethyleneimine (PEI) yields the covalent attachment of the polymer to the sidewalls of the nanotubes, which have a high absorption of CO2 (9.2% w/w) and most importantly the desoption of CO2 is accomplished at 75 °C (significantly lower than other adsorbants). We propose that the hydrophilic PEI is repelled from the hydrophobic surface of the SWNT thus facilitating uptake and desorption.