Abstract
The solubility of coumarin in three aqueous solutions of acidic deep eutectic solvents (DESs) based on choline chloride (ChCl) as hydrogen bond acceptor (HBA) with some carboxilic acids (propionic acid, lactic acid and acetic acid) as hydrogen bond donors (HBD) have been measured using the shake flask method at T = (298.15 to 313.15) K. According to obtained results, the solubility of coumarin increases with increasing the weight fraction of ChCl/propionic acid more than 100-fold. The experimental solubility data were correlated by electrolyte Nonrandom Two-Liquid (e-NRTL),Wilson and UNIQUAC activity coefficient models. Then, the dissolution thermodynamic properties, enthalpy, Gibbs free energy and entropy were calculated based on Gibbs and van't Hoff equations to investigate the solvation behavior of coumarin in the aqueous DES solutions.
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