title: Carbon Dioxide Capture with Ionic Liquids and Deep Eutectic Solvents: A New Generation of Sorbents.
abstract: High cost and high energy penalty for CO2uptake from flue gases are important obstacles in large-scale industrial applications, and developing efficient technology for CO2capture from technical and economic points is crucial. Ionic liquids (ILs) show the potential for CO2separation owing to their inherent advantages, and have been proposed as alternatives to overcome the drawbacks of conventional sorbents. Chemical modification of ILs to improve their performance in CO2absorption has received more attention. Deep eutectic solvents (DESs) as a new generation of ILs are considered as more economical alternatives to cope with the deficiencies of high cost and high viscosity of conventional ILs. This Review discusses the potential of functionalized ILs and DESs as CO2sorbents. Incorporation of CO2-philic functional groups, such as amine, in cation and/or anion moiety of ILs can promot their absorption capacity. In general, the functionalization of the anion part of ILs is more effective than the cation part. DESs represent favorable solvent properties and are capable of capturing CO2, but the research work is scarce and undeveloped compared to the studies conducted on ILs. It is possible to develop novel DESs with promising absorption capacity. However, more investigation needs to be carried out on the mechanism of CO2sorption of DESs to clarify how these novel sorbents can be adjusted and fine-tuned to be best tailored as optimized media for CO2capture.
authors.affiliation: Department of Engineering Science and Mathematics, Division of Energy Science, Luleå University of Technology, 971 87, Luleå, Sweden.
authors.forename: Shokat
authors.identifier: 0000-0002-6516-1230
authors.initials: S
authors.lastname: Sarmad
authors.affiliation: Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Umeå University, SE-90871, Umeå, Sweden.|Industrial Chemistry & Reaction Engineering, John Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, Fl-20500, Åbo-Turku, Finland.
authors.forename: Jyri-Pekka
authors.initials: JP
authors.lastname: Mikkola
authors.affiliation: Department of Engineering Science and Mathematics, Division of Energy Science, Luleå University of Technology, 971 87, Luleå, Sweden.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Ji
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry* / Q000302:isolation & purification; D052578:Ionic Liquids / Q000737:chemistry*; D012995:Solubility
chemical_list: D052578:Ionic Liquids; D002245:Carbon Dioxide
keywords: carbon dioxide capture; deep eutectic solvents; green chemistry; ionic liquids; sorbent