Emerging trends in sustainable CO2 separation and capture using deep eutectic solvents

• Comparison of conventional CO₂ Separation & capture methods with emerging DES. • DES as a green, biodegradable, non-toxic, and cost-effective solvents for CO₂ capture & separation. • Review categorizes DES into different types based on their components. • Summarizing CO₂ solubility in various DES compositions under different conditions. • Review discusses DES integration with nanomaterials and supported liquid membranes for separation systems and CO₂ capture technologies. Carbon Dioxide capture is one of the few areas that has been extensively researched in the recent past, however, a viable solution remains elusive. Proven technologies like amine absorption, pressure swing adsorption etc. though commercialized, suffer from certain inherent drawbacks like high energy consumption, usage of corrosive chemicals and economically intensive nature. In recent years, researchers have strategically redirected their efforts towards the realm of energy-efficient carbon dioxide separation using membranes modified by the strategic incorporation of efficient additive materials into membrane structures. This incorporation has initiated a transformative shift away from conventional techniques, leading to the emergence of more efficient and sustainable processes for carbon dioxide capture and separation. In this context, carbon dioxide capture using Deep Eutectic Solvents has garnered significant attention due to remarkable attributes of these solvents, which include low volatility, non-toxic, thermal stability and biodegradable nature. Various types of Deep Eutectic Solvents have been explored for effective carbon dioxide capture and this paper attempts to present a comprehensive review of these diverse Deep Eutectic Solvents types. Furthermore, it delves into the specific components, namely Hydrogen Bond Donors and Hydrogen Bond Acceptors present in each Deep Eutectic Solvents. The review explores the details of supported liquid membranes made of Deep Eutectic Solvents and discusses the practical challenges of using Deep Eutectic Solvents for separating carbon dioxide. It also explores potential areas for future research in this field.