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Updated: Feb 5, 2026

Preparation of Binary and Ternary Deep Eutectic Systems
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Intermolecular interactions upon carbon dioxide capture in deep-eutectic solvents.

Shashi Kant Shukla1, Jyri-Pekka Mikkola2

  • 1Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Umeå University, SE-90187 Umeå, Sweden. shashi.kant.shukla@umu.se jyri-pekka.mikkola@umu.se.

Physical Chemistry Chemical Physics : PCCP
|September 20, 2018
PubMed
Summary
This summary is machine-generated.

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Deep-eutectic solvents (DESs) show promising CO2 capture capabilities. Optimal CO2 uptake in these hydrogen-bond-based systems depends on the interplay between hydrogen bond acceptors and donors, not just basicity.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Deep-eutectic solvents (DESs) are emerging as promising materials for carbon capture.
  • Understanding the factors influencing CO2 uptake in DESs is crucial for developing efficient capture technologies.
  • The interplay of hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) dictates solvent properties.

Purpose of the Study:

  • To investigate CO2 uptake in various DESs formed by different HBAs and HBDs.
  • To analyze the influence of HBA:HBD mole ratio on CO2 absorption.
  • To correlate CO2 capture performance with solvent polarity parameters and H-bonding interactions.

Main Methods:

  • Synthesis of DESs using HBAs like monoethanolammonium chloride ([MEA·Cl]), 1-methylimidazolium chloride ([HMIM·Cl]), and tetra-n-butylammonium bromide ([TBAB]).

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  • Utilized HBDs including ethylenediamine ([EDA]), diethylenetriamine ([DETA]), tetraethylenepentamine ([TEPA]), pentaethylenehexamine ([PEHA]), 3-amino-1-propanol ([AP]), and aminomethoxypropanol ([AMP]).
  • Quantified CO2 uptake and analyzed solvent properties (acidity α, basicity β) and speciation of absorbed CO2.

    • Main Results:

    • DESs such as [MEA·Cl][EDA], [MEA·Cl][AP], [HMIM·Cl][EDA], and [HMIM·Cl][AP] demonstrated excellent CO2 uptake.
    • CO2 uptake improved with an increased HBA:HBD mole ratio (1:1 to 1:4).
    • Basicity alone does not solely determine CO2 uptake; H-bonding interactions are critical, especially with weaker HBDs like [TEPA] and [PEHA].

    Conclusions:

    • CO2 capture in DESs is governed by a complex interplay of H-bonding interactions between HBAs and HBDs.
    • Optimal DES performance for CO2 absorption requires balanced hydrogen bond donor acidity (α) and acceptor basicity (β).
    • Water addition decreases CO2 uptake by reducing the basicity (β) of the DES.