Journal
CHEMICAL ENGINEERING JOURNAL
Volume 283, Issue -, Pages 692-702Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.08.006
Keywords
Ionic liquid; Porous silica; CO2 capture; Confinement; Adsorption; SILP
Categories
Funding
- University of South Australia
- CSIRO Energy Flagship
- Postgraduate Studentship Award from CSIRO
- International President's Scholarship from the University of South Australia
- Australian Research Council [DP110101293]
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Novel high capacity hybrid sorbents for CO2 capture have been developed based on zinc-functionalized ionic liquid (IL) impregnated into mesoporous silica beads derived from calcium alginate template beads. Pore modification and development of a surface-confined layer of IL synergistically enhanced the uptake capacity (up to 8.7 wt%) and kinetics of these materials. Spectroscopic and thermophysical signatures of the IL impregnated materials confirm the existence of a highly confined IL layer at low IL:SiO2 ratio, and multilayer-mimicking bulk phase at higher IL loading. Our results clearly demonstrate that developing a thin layer of zinc-functionalized IL onto porous silica beads effectively enhances the uptake kinetics by exposing interaction sites across a large surface area, and facilitating diffusion through the pore network of the support. (C) 2015 Elsevier B.V. All rights reserved.
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