Functionalized silica xerogels obtained from rice husk for carbon dioxide adsorption

Reference	Presenter	Authors (Institution)	Abstract
06-184	Juan David Pardo	Pardo, J.D.(Universidad del Valle); Gómez, M.A.(Universidad del Valle); Calambas, D.S.(Universidad del Valle); Delvasto, S.(Universidad del Valle); Arango, E.(Universidad del Valle); Forero, C.R.(Universidad del Valle);	In this investigation, silica xerogel particles with ${\mathrm{CO}}_2$ capture capacity were produced from rice husk (RH). Initially, the siliceous precursor was obtained through a thermochemical treatment of the RH and then the ceramic particles were obtained through a sol-gel synthesis process. Unlike conventional methods that employ reagents of high toxicity and cost, this is a process friendly to the environment and with economic operating parameters, such as low ageing times (not exceeding 18 hours) and gelation at room temperature. It was observed that with the use of a structure directing agent such as hexadecyltrimethylammonium bromide (CTAB), siliceous xerogels can be obtained with micro and bimodal mesoporosity (around 15 Å), with pore volume of 0.76 ${\mathrm{cm}}^3/\mathrm{g}$, in addition to a very high specific area (1,051 ${\mathrm{m}}^2/\mathrm{g}$). Finally, siliceous xerogels were functionalized using tetraethyl pentamine (TEPA), which resulted in a functional material with ${\mathrm{CO}}_2$capture capacity of up to 140 $\mathrm{mg}/\mathrm{g} \mathrm{ads}$.
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