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Functional deep eutectic solvents (FDESs) with polyethylenimine (PEI) show high performance in removing hydrogen sulfide (H2S) via chemisorption. The optimal 25% PEI/FDES@EG demonstrated efficient H2S absorption and good regeneration capabilities.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Environmental Science

Background:

  • Hydrogen sulfide (H2S) is a toxic and corrosive gas requiring efficient removal.
  • Deep eutectic solvents (DESs) offer tunable properties for gas absorption applications.
  • Functionalizing DESs with polymers like polyethylenimine (PEI) can enhance H2S capture.

Purpose of the Study:

  • To synthesize and characterize functional deep eutectic solvents (FDESs) for H2S absorption.
  • To investigate the H2S absorption mechanism and performance of FDESs.
  • To evaluate the influence of various parameters on the desulfurization efficiency.

Main Methods:

  • Synthesis of four DESs and their functionalization with 5-30% PEI.
  • Characterization using Fourier transform infrared spectroscopy, thermogravimetric analysis, and nuclear magnetic resonance.
  • Dynamic absorption experiments and quantum chemical calculations for mechanism elucidation.

Main Results:

  • Successful synthesis and characterization of PEI-functionalized DESs (FDESs).
  • FDESs exhibit preferential chemisorption of H2S.
  • 25% PEI/FDES@EG demonstrated the highest H2S removal efficiency.
  • Optimal absorption occurred at low temperatures (30 °C) and low H2S concentrations.
  • Moisture significantly impacts the desulfurization system.
  • FDESs maintained good regeneration performance over at least five cycles.

Conclusions:

  • PEI-functionalized DESs are effective sorbents for H2S removal.
  • The 25% PEI/FDES@EG formulation shows promising desulfurization performance.
  • FDESs offer a viable solution for H2S capture with good recyclability.