Challenges and Possibilities of Deep Eutectic Solvent-Based Membranes

Abstract

Deep eutectic solvents (DES) are a category of a new class of solvents that can overcome some of the main drawbacks of typical solvents and ionic liquids (ILs). DES have been widely investigated and applied by the research community in several applications since their invention. Over the past years, the use of DES has been directed to the production of new materials and items for new products and processes. This is the case for the implementation of DES in various fields of chemical engineering directed to separations. DES have been very recently initiated to be combined into membranes for membrane processes. In this regard, this Review timely elucidates the current progress in utilizing this new generation of solvents in membrane preparation. In this work, different techniques, methods, and strategies for incorporating DES into polymer membranes for different concepts of membranes according to the final application have been reviewed. Particular emphasis has been devoted to the most relevant development works and results. After the current literature was analyzed, the main challenges and possibilities of DES in membranes were declared.

A Review on Edible Coatings and Films: Advances, Composition, Production Methods, and Safety Concerns

“…These solvents have excellent beneficial attributes including plasticization, improved mechanical attributes, enhanced thermal stability, and solubility enhancement. DES also have antimicrobial attributes that help to extend the shelf life of food materials . Application of DES for chitosan-based films is a recent research area.…”

Hydrophobic Deep Eutectic Solvents as Greener Substitutes for Conventional Extraction Media: Examples and Techniques

“…Recent developments in DESs show immense potential as green substitutes for commercially available toxic organic solvents. 6 , 7 However, the noncytotoxic, biodegradable, and biocompatible nature of these solvents are often overemphasized and needs to be assessed carefully. As opposed to ionic liquids 8 that are salts of an organic cation and anion (having a melting point below 100 °C), DESs are mixtures of two or more components with melting points lower than that of the individual components.…”

“…Deep eutectic solvents (DESs) are a class of designer solvents that generally have low volatility and flammability and can exist as chemically inert liquids over a wide temperature range. − Currently, research in the areas of Chemistry and Chemical Engineering is focused on promoting sustainable and green practices with an emphasis on the use of novel renewable sources, practices that minimize negative impacts on the environment and economy. Recent developments in DESs show immense potential as green substitutes for commercially available toxic organic solvents. , However, the noncytotoxic, biodegradable, and biocompatible nature of these solvents are often overemphasized and needs to be assessed carefully. As opposed to ionic liquids that are salts of an organic cation and anion (having a melting point below 100 °C), DESs are mixtures of two or more components with melting points lower than that of the individual components.…”

Fabrication of novel gallic acid functionalized chitosan/pullulan active bio-films for the preservation and shelf-life extension of green chillies

“…[20][21][22] Further, the use of additives like green deep eutectic solvents (DES) in the development of CS based lms has shown improved solubility, tensile stability and exibility. [23][24][25] For instance, Zarandona et al…”

“…20–22 Further, the use of additives like green deep eutectic solvents (DES) in the development of CS based films has shown improved solubility, tensile stability and flexibility. 23–25 For instance, Zarandona et al (2020) claimed that the incorporation of GA greatly enhanced the antimicrobial and antioxidant property of the chitosan films, 26 and also tensile strength and elongation at break were significantly tailored when it was formulated with gelatin. 27 Moreover, GA grafted CS films have shown the maximum water vapor barrier and thermal stability reported by Zhang et al (2019).…”