Microporous metal-organic frameworks based on deep eutectic solvents for adsorption of toxic gases and volatile organic compounds: A review

Metal-organic frameworks (MOFs) belonging to porous 2- or 3-dimensional materials have shown promising potential with wide use in different multidisciplinary fields because they possess remarkable structural properties which confer on them tunable functionalities coupled with excellent morphologies and topologies. Different syntheses approaches have been designed and developed for the preparation of various MOF derivatives. However, unique solvents such as deep eutectic solvents (DESs) have been extensively studied recently because they can serve as essential precursors for preparing many novels and sophisticated composite materials where environmental benign processes are required. These green solvents are gaining serious attention as a templating agent for the facile, direct mixing, and/or ionothermal synthesis of MOFs because they synthesize easily, production is less expensive, and possess effective control of particle morphologies, pore sizes, and shapes, which have been reported to have significant influence in their adsorptive functions. Thus, this review highlights the progress in the development of DES-based MOFs bearing tunable functionalities and their applications for the adsorption of toxic gaseous pollutants.