Ethylenediamine loading into a manganese-based metal–organic framework enhances water stability and carbon dioxide uptake of the framework

Abstract

Metal–organic frameworks (MOFs) based on 2,5-dihydroxyterepthalic acid (DOBDC) as the linker show very high CO 2 uptake capacities at low to moderate CO 2 pressures; however, these MOFs often require expensive solvent for synthesis and are difficult to regenerate. We have synthesized a Mn-DOBDC MOF and modified it to introduce amine groups into the structure by functionalizing its metal coordination sites with ethylenediamine (EDA). Repeat framework synthesis was then also successfully performed using recycled dimethylformamide (DMF) solvent. Characterization by elemental analysis, FTIR and thermogravimetric studies suggest that EDA molecules are successfully substituting the original metal-bound DMF. This modification not only enhances the material's carbon dioxide sorption capacity, increasing stability to repeated CO 2 sorption cycles, but also improves the framework's stability to moisture. Moreover, this is one of the first amine-modified MOFs that can demonstrably be synthesized using recycled solvent, potentially reducing the future costs of production at larger scales.

Advanced Strategies in Metal‐Organic Frameworks for CO2 Capture and Separation

“…Here targeted groups incorporation can alter overall MOF networks so potentially changing MOFs applications. [156] Newly modified MOFs can be used successfully in catalysis, drug delivery, gas adsorption and storage applications. [157,158] In Pre-synthetic MOF modification groups (like hydroxyl [159] and carboxyl are widely used for grafting on MOF ligands.…”

“…Metal atom and choice of ligand in MOFs have potential effects on framework‘s overall structure and adsorption capacities. Here targeted groups incorporation can alter overall MOF networks so potentially changing MOFs applications [156] . Newly modified MOFs can be used successfully in catalysis, drug delivery, gas adsorption and storage applications [157,158] .…”

Zeolitic imidazolate framework (ZIF)-derived porous carbon materials for supercapacitors: an overview

“…We also published several research papers focused on MOFs in Elsevier and other respected journals. [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] Another report discusses the possibilities of using MOFs as a template to prepare functional nanostructures. 59…”

Nickel-L-leucine framework (MOF): synthesis, structural characterization, and potential applications in biological studies

“…These materials have a highly regular, three-dimensional structure with a high surface area, making them useful in a variety of applications such as gas storage and separation, catalysis, sensing, and drug delivery [8,9]. The unique properties of MOFs arise from their precise control over pore size and shape, as well as their tunable functionality through the choice of metal ions and organic ligands [10]. The porous nature of MOFs allows for the storage of gases such as hydrogen, methane, and carbon dioxide, and their separation from other gases [11,12].…”