TY - JOUR
T1 - Effect of water activity on carbon dioxide transport in cholinium-based ionic liquids with carbonic anhydrase
AU - Martins, C. F.
AU - Neves, Luísa Alexandra Graça
AU - Estevão, M.
AU - Rosatella, A.
AU - Alves, V. D.
AU - Afonso, C. A. M.
AU - Crespo, J. G.
AU - Coelhoso, I. M.
N1 - sem pdf conforme despacho.
Fundacao para a Ciencia e a Tecnologia (FCT) - PTDC/QEQ-PRS/2824/2012 ; UID/QUI/50006/2013 ; UID/DTP/04138/2013 ; PEst-OE/AGR/UI0245/2014 ; SFRH/BD/111128/2015 ; SFRH/BPD/75045/2010
PY - 2016/8/10
Y1 - 2016/8/10
N2 - The present work reports a study of the affinity of carbon dioxide towards biocompatible cholinium-based ionic liquids, aiming the development of a sustainable process for carbon dioxide removal. Moreover, the enhancement on carbon dioxide transport by the addition of carbonic anhydrase, able to catalyze the reversible reaction of carbon dioxide with water, is also evaluated. Cholinium acetate, cholinium propionate and cholinium hexanoate were the selected ionic liquids for this study. Carbon dioxide solubility and diffusion coefficients were determined in the three cholinium ionic liquids, at different water activities, in order to identify optimal conditions for the enzyme activity and stability. A carbon dioxide diffusion coefficient correlation for the cholinium-based ionic liquids with different water activities is proposed, allowing for estimation of carbon dioxide diffusion coefficients. The results obtained show that the selected cholinium-based ionic liquids possess high affinity towards carbon dioxide, when compared with most used room temperature ionic liquids. Also, it was demonstrated that a small amount of the carbonic anhydrase (0.1 mgCA/gIL) promotes an enhancement of 63% on the carbon dioxide transport rate, for cholinium propionate with a water activity of 0.753.
AB - The present work reports a study of the affinity of carbon dioxide towards biocompatible cholinium-based ionic liquids, aiming the development of a sustainable process for carbon dioxide removal. Moreover, the enhancement on carbon dioxide transport by the addition of carbonic anhydrase, able to catalyze the reversible reaction of carbon dioxide with water, is also evaluated. Cholinium acetate, cholinium propionate and cholinium hexanoate were the selected ionic liquids for this study. Carbon dioxide solubility and diffusion coefficients were determined in the three cholinium ionic liquids, at different water activities, in order to identify optimal conditions for the enzyme activity and stability. A carbon dioxide diffusion coefficient correlation for the cholinium-based ionic liquids with different water activities is proposed, allowing for estimation of carbon dioxide diffusion coefficients. The results obtained show that the selected cholinium-based ionic liquids possess high affinity towards carbon dioxide, when compared with most used room temperature ionic liquids. Also, it was demonstrated that a small amount of the carbonic anhydrase (0.1 mgCA/gIL) promotes an enhancement of 63% on the carbon dioxide transport rate, for cholinium propionate with a water activity of 0.753.
KW - Biocompatible ionic liquids
KW - Carbon dioxide solubility in ionic liquids
KW - Carbon dioxide transport and removal
KW - Carbonic anhydrase enzyme
KW - Diffusion coefficient correlation in ionic liquids
UR - http://www.scopus.com/inward/record.url?scp=84970021792&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2016.05.004
DO - 10.1016/j.seppur.2016.05.004
M3 - Article
AN - SCOPUS:84970021792
SN - 1383-5866
VL - 168
SP - 74
EP - 82
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -