Screening of deep eutectic solvents (DESs) as green CO₂ sorbents: from solubility to viscosity

Abstract

35 novel DESs are synthesized and screened in terms of their CO2 solubility and viscosity.

CO2‐Philic Separation Membrane: Deep Eutectic Solvent Filled Graphene Oxide Nanoslits

“…We owe such thermal stability to the strong binding between DES and GO and also the stable 2D space structure of GO laminar to maintain the whole DES/GO membrane system. The gas permeance variation trend with the temperature originates from the fact that, though CO 2 solubility in DES decreases as temperature increases, a higher temperature makes the DES viscosity lower and thereby facilitates the CO 2 diffusion . The initial GO‐SDESM‐6 experienced ongoing gas permeation for a week.…”

“…As neoteric environmental benign analogues of ILs, deep eutectic solvents (DESs) share the advantages of ILs but outperform ILs in low cost and synthesis simplicity, nontoxicity, biocompatibility and comparable CO 2 capacity relative to ILs . DESs are characterized by a eutectic point reached by typically mixing a quaternary ammonium salt as hydrogen bond acceptor (HBA) and electroneutral hydrogen bond donor (HBD) at a specific stoichiometric ratio, which is much lower than the melting temperature of both of the constituting components of the eutectic mixture, resulting from the charge delocalization induced by the hydrogen bond (HB) between the anion moieties of salts and HBD and further depression of the lattice energy of the eutectic system . The reduction of freezing point makes lots of DESs remain liquid state under ambient temperature .…”

The peculiar effect of water on ionic liquids and deep eutectic solvents

“…22 In addition, some ILs and DESs exhibit high physisorption capacities. 23 However, the CO 2 absorption rate of ILs/DESs is generally low because of their high viscosities, and the costs associated with the large-scale manufacturing of these substances are still too high.…”

“…There have been some reviews only regarding pure DESs. 3,[53][54][55][56][57][58][59][60][61] For IL/DES-H 2 O systems, only a handful of reviews have been published with the focus on a single property and/or only a limited number of ILs. 35,48,62 Tariq et al 62 discussed the surface tension of ILs and IL solutions, with regard to the effects of temperature, the addition of water or other impurities, and the IL structure on the surface tension.…”

Electrodeposition of Ag onto Au(111) from Deep Eutectic Solvents

“…The various classes of deep eutectic solvents are utilized in a wide range of applications, e. g. in syntheses or for the extraction of biologically relevant molecules. [1][2][3] DES are also used as auspicious electrolytes in electrocatalysis [4][5][6] or for the electrochemical production of nanostructures. [7] In many fields of electrochemistry, DES are appropriate candidates for the use as anhydrous electrolytes with a broad area of applications in metal deposition, electropolishing and energy storage.…”