TY - JOUR
T1 - Role of water on deep eutectic solvents (DES) properties and gas transport performance in biocatalytic supported DES membranes
AU - de Castro, Aline M.
AU - Prasavath, Dala
AU - Bevilaqua, Juliana V.
AU - Portugal, Carla A. M.
AU - Neves, Luisa A.
AU - Crespo, João G.
N1 - To PETROBRAS and National Council for Scientific and Technological Development (CNPq, Brazil) for the funding to AMC. This work was also supported by the Associate Laboratory for Green Chemistry - LAQV which is financed by national funds from FCT/MCTES (UIDB/50006/2020), and Fundacao para a Ciencia e a Tecnologia for the exploratory project (IF/00505/2014/CP1224/CT0004) attributed to LAN within the 2014 FCT Investigator Programme. Dr. Luiz Silvino Chinelatto Junior is gratefully acknowledged for interpretation of NMR data. Authors also acknowledge Elisabete Ferreira, for her assistance in nano-DSC analysis, Dr. Maria Joao Melo for the access to the fluorescence equipment, and Rita Nabais, Dr. Jose Esperanca, Dr. Tariq Mohammad and Carla Martins for their general assistance in laboratory procedures.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - The development of efficient and clean CO2 capture technologies is a topic of utmost importance in the global environmental agenda. In this work, a wide range of analytical procedures (1H and 13C NMR, TGA, DSC, FT-IR, viscosity, density, refractive index, fluorescence anisotropy, UV–Vis) was used to investigate the properties of deep eutectic solvent (DES) composed of choline chloride and levulinic acid (ChCl:LA), conditioned to four different water activity (aw) values. Also, the impact of using the enzyme carbonic anhydrase (CA), known for its ability to reversibly convert CO2 into bicarbonate, was assessed on DES properties. The ChCl:LA-water mixtures showed to be present as a cohesive cluster up to aw = 0.753 and, above that, in a hydrated form with a free water layer that could crystalize at negative temperatures (-40 to −45 °C), suggesting anti-freezing properties of the solvent. DES were then supported in polymeric hydrophilic membranes. Based on CO2 and N2 permeabilities through these membranes, the one that contained ChCl:LA at aw = 0.216 was further studied regarding its long-term stability. This supported liquid membrane showed a consistent behavior for up to 30 repeated cycles and a stable operating behavior for transmembrane pressure differences in the range of 0.50–1.25 bar. These findings evidence the stability of supported DES membranes and the potential for CO2 capture.
AB - The development of efficient and clean CO2 capture technologies is a topic of utmost importance in the global environmental agenda. In this work, a wide range of analytical procedures (1H and 13C NMR, TGA, DSC, FT-IR, viscosity, density, refractive index, fluorescence anisotropy, UV–Vis) was used to investigate the properties of deep eutectic solvent (DES) composed of choline chloride and levulinic acid (ChCl:LA), conditioned to four different water activity (aw) values. Also, the impact of using the enzyme carbonic anhydrase (CA), known for its ability to reversibly convert CO2 into bicarbonate, was assessed on DES properties. The ChCl:LA-water mixtures showed to be present as a cohesive cluster up to aw = 0.753 and, above that, in a hydrated form with a free water layer that could crystalize at negative temperatures (-40 to −45 °C), suggesting anti-freezing properties of the solvent. DES were then supported in polymeric hydrophilic membranes. Based on CO2 and N2 permeabilities through these membranes, the one that contained ChCl:LA at aw = 0.216 was further studied regarding its long-term stability. This supported liquid membrane showed a consistent behavior for up to 30 repeated cycles and a stable operating behavior for transmembrane pressure differences in the range of 0.50–1.25 bar. These findings evidence the stability of supported DES membranes and the potential for CO2 capture.
KW - Carbonic anhydrase
KW - CO capture
KW - Deep eutectic solvents
KW - Gas permeation
KW - Supported liquid membranes
UR - http://www.scopus.com/inward/record.url?scp=85091362118&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2020.117763
DO - 10.1016/j.seppur.2020.117763
M3 - Article
AN - SCOPUS:85091362118
SN - 1383-5866
VL - 255
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 117763
ER -