Long-term Isothermal Stability of Deep Eutectic Solvents

Liu

et al. 2022

New J. Chem.

“…50 The mass loss of ChCl : GL within 10 h at 60 1C and 120 1C was 4.7% and 18.3%, respectively. 56 2.4.5 Effect of time. A longer exposure time will cause more mass loss in DESs.…”

Section: Thermal Decomposition Vs Volatility Of Ilsmentioning

confidence: 99%

Thermal, chemical, electrochemical, radiolytic and biological stability of ionic liquids and deep eutectic solvents

Liu

et al. 2022

New J. Chem.

“…However, are they really so stable? Compared to numerous reports on the stability of ionic liquids, − the volatilization of DESs is seldom reported. Inspired by the research on the stability (including volatility and decomposition) of ionic liquids we would like to give a thorough investigation on the volatility of DESs.…”

Section: Introductionmentioning

confidence: 97%

Volatility of Deep Eutectic Solvent Choline Chloride:N-Methylacetamide at Ambient Temperature and Pressure

et al. 2019

Ind. Eng. Chem. Res.

Common organic volatile solvents would volatilize in air, thus causing air pollution and harming human health. Deep eutectic solvents (DESs) are one type of the green solvents with low volatility, deemed as the new solvents of the 21st century. Previous investigation showed that the DESs would undergo volatilization at high temperature and/or vacuum pressure. However, how DESs volatile at ambient temperature and pressure is unknown. Here the volatilization of DESs in air at ambient temperature and pressure was investigated by in situ FT−IR and 2D FT−IR. ChCl (choline chloride):Nmethylacetamide was taken as an example of DESs and we found that it underwent severely volatilization even at ambient temperature and pressure. Moreover, the dynamics process of the volatilization was investigated by 2D FT−IR. It was found that N-methylacetamide volatilizes from ChCl:N-methylacetamide by destroying the hydrogen bond between free NH group and ChCl in ChCl:N-methylacetamide during the first 60 min. H-bonded NH II with strong H-bonding interaction with ChCl also undergoes a remark alternation at this turning point at ca. 60 min. During the period from 60 and 190 min, there also exists free NH in the DES ChCl:N-methylacetamide. The shift of free NH group ceases after ca. 70 min. After 190 min, most of Nmethylacetamide in ChCl:N-methylacetamide have volatilized, only trace of N-methylacetamide is left, therefore, the shift of IR absorption peaks is negligible. This works shows that we should pay more attention to the volatilization of DESs even at ambient temperature and pressure.

“…Deng et al reported that the decomposition temperature of DESs ChCl:phenol was much higher than the desorption temperature . However, the long-term stability of DESs revealed that it should be paid more attention to even if DESs were stable by short-term characterizations …”

Section: Introductionmentioning

confidence: 99%

“…65 However, the longterm stability of DESs revealed that it should be paid more attention to even if DESs were stable by short-term characterizations. 103 The presence of halogen elements (e.g., Cl in the components of ChCl, betaine, EMIMCl) in DESs possibly caused severe corrosion of industrial equipment. ChCl-based DESs were previously demonstrated to be highly hygroscopic, 74 which might affect the SO 2 capture.…”

Section: ■ Introductionmentioning

confidence: 99%

Capture of Toxic Gases by Deep Eutectic Solvents

ACS Sustainable Chem. Eng.

Han

Liu

et al. 2020

149

Sulfur dioxide (SO 2 ), ammonia (NH 3 ), hydrogen sulfide (H 2 S), nitrogen dioxide (NO 2 ), and nitric oxide (NO) are toxic gases from industrial exhaust, which could lead to acid rain, air pollution, health hazards, or corrosion of buildings. Removal of toxic gas is necessary for mitigating damage on human health, improving air quality, conforming to government regulations, and reusing in industry. However, capture of toxic gases with high efficiency, high selectivity, high sustainability, and low cost is still very challenging. Deep eutectic solvents (DESs) are novel green and designable solvents with high biocompatibility, high degradability, and low cost. Capturing toxic gases (e.g., SO 2 , NH 3 , H 2 S, NO 2 , and NO) by DESs is promising and environmentally friendly, which has attracted much attention. Here, we review the capture of SO 2 , NH 3 , H 2 S, NO 2 , and NO by DESs. CO 2 capture by DESs is not included because several reviews on that topic have been published.