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Open AccessArticle

“Low Cost” Pore Expanded SBA-15 Functionalized with Amine Groups Applied to CO2 Adsorption

1
Department of Chemical Engineering, Universidade Federal do Ceará, Campus do Pici, bl. 709, 60455-760 Fortaleza, Brazil
2
Departament of Inorganic Chemistry, Cristallography and Mineralogy, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain
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Author to whom correspondence should be addressed.
Academic Editor: Rafael Luque
Materials 2015, 8(5), 2495-2513; https://doi.org/10.3390/ma8052495
Received: 1 March 2015 / Revised: 28 April 2015 / Accepted: 30 April 2015 / Published: 11 May 2015
(This article belongs to the Special Issue Advances in Mesoporous Material 2015)
The CO2 adsorption capacity of different functionalized mesoporous silicas of the SBA-15 type was investigated and the influence of textural properties and the effect of the silicon source on the CO2 uptake studied. Several adsorbents based on SBA-15 were synthesized using sodium silicate as silicon source, replacing the commonly used tetraethyl orthosilicate (TEOS). Thus, we synthesized three couples of supports, two at room temperature (RT, RT-F), two hydrothermal (HT, HT-F) and two hydrothermal with addition of swelling agent (1,3,5-triisopropylbenzene) (TiPB, TiPB-F). Within each couple, one of the materials was synthesized with ammonium fluoride (NH4F). The supports were functionalized via grafting 3-aminopropyltriethoxysilane (APTES) and via impregnation with polyethylenimine ethylenediamine branched (PEI). The adsorption behavior of the pure materials was described well by the Langmuir model, whereas for the amine-silicas, a Dualsite Langmuir model was applied, which allowed us to qualify and quantify two different adsorption sites. Among the materials synthesized, only the SBA-15 synthesized at room temperatures (RT) improved its properties as an adsorbent with the addition of fluoride when the silicas were functionalized with APTES. The most promising result was the TiPB-F/50PEI silica which at 75 °C and 1 bar CO2 captured 2.21 mmol/g. View Full-Text
Keywords: SBA-15; 1,3,5-triisopropylbenzene; ammonium fluoride; adsorption; CO2; 3-aminopropyltriethoxysilane; polyethylenimine ethylenediamine; Dualsite Langmuir model; chemisorptions SBA-15; 1,3,5-triisopropylbenzene; ammonium fluoride; adsorption; CO2; 3-aminopropyltriethoxysilane; polyethylenimine ethylenediamine; Dualsite Langmuir model; chemisorptions
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Vilarrasa-García, E.; Cecilia, J.A.; Moya, E.M.O.; Cavalcante, C.L., Jr.; Azevedo, D.C.S.; Rodríguez-Castellón, E. “Low Cost” Pore Expanded SBA-15 Functionalized with Amine Groups Applied to CO2 Adsorption. Materials 2015, 8, 2495-2513.

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