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Mixtures of Cellulose Fibers from Pineapple Leaves, Ionic Liquid, and Alkanolamines for CO2 Capture
María Fernanda Agudelo Hernández,Marisol Fernández Rojas,Franciele Bernard,Sandra Einloft,Luz Angela Carreño Diaz 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Researchers around the world are looking for ways to improve or develop new technologies to mitigate theemissions of CO2 present in greenhouse gases. Amines are currently the most used substances to capture CO2. The ionicliquids (ILs), however, have also been considered promising materials. Recently, mixtures of ILs and amines have beenstudied for this purpose. The ILs are also being supported in solid matrices (polymers, zeolites, cellulose, and membranes) toobtain stable, easy to handle, and reusable materials. Cellulose fibers make a promising matrix, considering their affinity withCO2, renewable feature, and thermal, mechanical, and chemical stability. To improve the CO2 capture capacity by usingcellulose and the mixture of ILs and amines, we prepared mixtures of the ionic liquid 1-butyl-3-methylimidazoliumtetrafluoroborate [BMIM][BF4] and monoethanolamine or triethanolamine. Then, we dropped the mixtures on naturalcellulose fibers from pineapple leaves. This paper reports the characterization of the composite materials by FTIR, XRD,XPS, FESEM, and TGA-FTIR in order to evaluate their structure, composition, morphology, and thermal behavior. We alsoreport the CO2 sorption capacity at 25 °C and 25 bar as determined by the pressure-decay technique as well as the CO2selectivity using a CO2/CH4 mixture. We found that the fiber with an alkaline treatment containing 35 % of IL and 35 % ofTEA captures the highest amount of CO2 (141 mg of CO2/g of fiber) and that the mixture TEA/IL is more selective for CO2.
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