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Séminaire PHENIX | Helenas Passos "From biocatalysis to metal separation..."

Mme Helena Passos  (University of Aveiro, Portugal)

Séminaire intitulé
"From biocatalysis to metal separation: the versatility of ionic-liquid-based aqueous biphasic systems"

Abstract :  Aqueous biphasic systems (ABS) are liquid-liquid extraction systems composed of two aqueous phases. The development of novel ABS by using ionic liquids (ILs), combine all the advantages of these solvents, namely their tailoring ability, with the advantages of ABS, making them highly interesting to be used in extraction and separation processes of a wide range of compounds. The versatility of IL-based ABS has been repeatedly demonstrated since the first report about the application of ILs as phase-forming components in 2003 [1]. Aiming at developing tailored systems with better extraction performance, we have been creating ABS that evolved from “simple” ABS used in the partition of small biomolecules, to multiphase-systems composed of three coexisting-phases, stimuli-responsive systems to act as integrated bioreaction– separation processes, and acidic ABS, which allowed to overcome the limited stability of ABS to the low pH and the “one pot” leaching and separation of critical metals. The development of these novel ABS was achieved by changing and/or adding new and tunable phase-forming components, resulting from a proper understanding of the mechanisms that rule their formation. In this presentation the development of a variety of versatile IL-based ABS will be addressed, along with the discussion of the mechanisms driving their formation.

Acknowledgements : This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MCTES. This work is funded by national funds through FCT – Fundação para a Ciência e a Tecnologia, I.P., under the Scientific Employment Stimulus - Individual Call - CEECIND/00831/2017 - under the CEEC Individual 2017.

[1] K.E. Gutowski, G.A. Broker, H.D. Willauer, J.G. Huddleston, R.P. Swatloski, J.D. Holbrey, R.D. Rogers, J. Am. Chem. Soc., 125, 2003, 6632-6633.


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