Four deep eutectic
solvents (DESs) were synthesized, and 5–30%
polyethylenimine (PEI) was added to make functional DESs (FDESs) for
dynamic absorption experiments of hydrogen sulfide. The synthesized
FDESs were characterized by Fourier transform infrared spectroscopy,
thermogravimetric analysis, and nuclear magnetic resonance. The results
demonstrated the successful synthesis of FDESs. The interaction between
H2S and the FDESs was discussed at a molecular level via
the quantum chemical calculations. It was noticed that FDESs prefer
chemisorption on H2S. In this work, the 25% PEI/FDES@EG
showed the highest desulfurization performance. The effects of H2S concentration and temperature on the desulfurization performance
were investigated. It was found that a relatively low temperature
(30 °C) was favorable for the absorption of H2S. The
25% PEI/FDES@EG could remove H2S efficiently over a low
H2S concentration. Moisture played an important role in
the FDES desulfurization system. The absorption/desorption cycle experiment
indicated that the FDESs retain their good regeneration performance
for at least five times.
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