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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 \u00b0C) 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.<\/jats:p>","DOI":"10.1021\/acsomega.0c01467","type":"journal-article","created":{"date-parts":[[2020,6,17]],"date-time":"2020-06-17T11:08:05Z","timestamp":1592392085000},"page":"15353-15361","source":"Crossref","is-referenced-by-count":55,"title":["Study on the Desulfurization and Regeneration Performance\nof Functional Deep Eutectic Solvents"],"prefix":"10.1021","volume":"5","author":[{"given":"Baohua","family":"Wang","sequence":"first","affiliation":[{"name":"Shandong University of Technology , , ,","place":["Zibo, P. R. China, 255049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Cheng","sequence":"additional","affiliation":[{"name":"Shandong University of Technology , , ,","place":["Zibo, P. R. 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