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Related Experiment Video

Updated: Jun 15, 2025

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An environmentally friendly deep eutectic solvent for CO2 capture.

Ali Asghar Manafpour1, Farzaneh Feyzi2, Mehran Rezaee1

  • 1Thermodynamic Research Laboratory, School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran.

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|August 26, 2024
PubMed
Summary

Deep eutectic solvents (DESs) offer a promising method for carbon dioxide (CO2) capture. A tetrapropylammonium bromide and formic acid DES demonstrated high CO2 solubility and efficient regeneration for climate change mitigation.

Keywords:
Carbon dioxide absorptionDeep eutectic solventFormic acidSustainable regenerationTetrapropylammonium bromideThermodynamic modeling

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Area of Science:

  • Environmental Chemistry
  • Materials Science

Background:

  • Anthropogenic carbon dioxide (CO2) emissions are a primary driver of global warming, necessitating effective reduction strategies.
  • Deep eutectic solvents (DESs) are emerging as adaptable alternatives to traditional absorbents for CO2 capture.
  • Investigating novel DES formulations is crucial for developing efficient carbon capture technologies.

Purpose of the Study:

  • To synthesize and characterize novel DESs for CO2 absorption.
  • To quantify CO2 solubility in synthesized DESs under varying conditions.
  • To evaluate the thermodynamic properties and regeneration efficiency of the most effective DES.

Main Methods:

  • Synthesis of DESs using tetrapropylammonium bromide (TPAB) and formic acid (Fa) at 1:1 and 1:2 molar ratios via heating.
  • CO2 solubility measurements using a static method at different pressures and temperatures.
  • Thermodynamic modeling with the nonrandom two liquids (NRTL) activity coefficient model and Peng-Robinson equation of state.
  • Confirmation of CO2 physical absorption using Nuclear Magnetic Resonance (NMR) and Fourier-transform infrared (FT-IR) spectroscopy.
  • Assessment of DES regeneration efficiency over multiple absorption/desorption cycles.

Main Results:

  • The TPAB-Fa (1:2) DES exhibited the highest CO2 solubility (0.218) at 25.0 °C.
  • Henry's law constant was determined from experimental data.
  • NMR and FT-IR analyses confirmed physical absorption of CO2.
  • The TPAB-Fa (1:2) DES demonstrated excellent regeneration efficiency of 99% after five cycles.

Conclusions:

  • The synthesized TPAB-Fa (1:2) DES is a highly efficient solvent for CO2 capture.
  • This DES shows significant potential for industrial applications in carbon capture and storage (CCS).
  • The study highlights the viability of DESs as sustainable solutions for mitigating CO2 emissions.