Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 249, Issue -, Pages 25-33Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.04.049
Keywords
Porous clay heterostructure; CO2 capture; APTES; PEI; TEPA
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Funding
- Ministerio de Economia y Competitividad [CTQ2015-68951-C3-3-R]
- FEDER (Excelencia, Junta de Andalucia) [P12-RNM-1565]
- European Project [295156]
- PNPD CAPES (Brazilian Ministry of Education)
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Porous clay heterostructures (PCH) have been synthesized from raw bentonite, obtaining porous materials with high surface area and micro-, meso- and macroporosity. Both raw bentonite and PCH have been evaluated in CO2 adsorption processes at 1 bar and 25 degrees C. In both cases, adsorption isotherms were well fitted using the Langmuir model, obtaining an increase of the CO2 adsorption from 0.112 mmol CO2 g(-1) for the raw bentonite to 0.640 mmol CO2 g(-1) in the PCH. In order to improve the CO2 adsorption capacity, raw bentonite and PCH were functionalized with amine species, via grafting using 3-aminopropyltriethoxysilane (APTES) and via impregnation with polyethylenimine (PEI) or tetraethylenepentamine (TEPA). The isotherms of the amine-functionalized samples were adjusted to the Dual-Langmuir model, which assumes the coexistence of physical and chemical adsorption sites. From the profiles of the CO2 isotherms, it can been observed that grafted-PCH with APTES shows the coexistence of physical and chemical interactions, reaching 1.023 mmol CO2 g(-1). The adsorption of CO2 on PCH impregnated with TEPA and mainly with PEI is governed by chemical interactions between the amine species located in the porous structure and/or on the surface of the adsorbent and the CO2 molecules, attaining maximum values of 1.644 and 1.465 mmol CO2 g(-1) for TEPA and PEI, respectively. (c) 2017 Elsevier Inc. All rights reserved.
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