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Influence of Amine Surface Treatment on Carbon Dioxide Adsorption Behaviors of Activated Carbon Nanotubes  

Jang, Dong-Il (Department of Chemistry, Inha University)
Cho, Ki-Sook (Environmental Systems Engineering, Korea University)
Park, Soo-Jin (Department of Chemistry, Inha University)
Publication Information
Applied Chemistry for Engineering / v.20, no.6, 2009 , pp. 658-662 More about this Journal
Abstract
In this work, the amine-treated activated carbon nanotubes (A-MWNTs) were used to investigate the $CO_2$ adsorption behaviors. A-MWNTs were prepared by impregnation with amine in methanol after chemical activation methods using a KOH. The characteristics of amine-treated A-MWNTs were studied by X-ray photoelectron spectroscopy (XPS), $N_2$ adsorption, desorption isotherms at 77 K. The specific surface area and pore volume of the A-MWNTs were analyzed by BET equation, BJH method, and t-plot method. $CO_2$ capture capacity as a function of temperature was measured by temperature programmed desorption (TPD). From the results, the amine treatment increased the basicity and nitrogen content of the A-MWNTs. The $CO_2$ adsorption capacity of the amine-nontreated A-MWNTs showed the highest value at room temperature and then greatly decreased with increasing the temperature. However, the amine-treated A-MWNTs presented a softer slope with temperature compared to the amine-nontreated ones. It was due to the strong interactions between $CO_2$ and amino groups presented on the carbon surfaces studied.
Keywords
activated carbon nanotubes; $CO_2$ adsorption; chemical activation;
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