Physicochemical Properties and Applications of Deep Eutectic Solvents for CO<sub>2</sub> Capture
Rima Biswas
Abstract
Abstract Rising anthropogenic greenhouse gas concentrations, notably CO 2 emissions, have led to environmental issues that affect both humans and ecosystems. CO 2 separation makes it easier to reduce energy use and CO 2 emissions, both of which are essential for combating the concern of global warming. The use of ionic liquids (ILs) as CO 2 capture solvents is recommended. However, the high viscosity, toxicity, cost, and poor biodegradability of ILs limit their large‐scale application. In recent years, deep eutectic solvents (DESs) have been created with improved CO 2 separation efficiency, lower preparation costs, and less negative environmental impact. The state‐of‐the‐art of the physicochemical properties of DESs in connection to their influence on CO 2 capture processes and the studies of CO 2 solubility in DESs are discussed. The absorption mechanism of CO 2 in DESs and the effect of temperatures, pressures, and hydrogen bond donors (HBDs) on the solubility of CO 2 in DESs are overviewed and analyzed, and future research directions on this topic are suggested.