Abstract
Two novel amorphous metal–organic frameworks (aMOFs) with chemical composition {[Zn2(MTA)]·4H2O·3DMF}n (UPJS-13) and {[Cd2(MTA)]·5H2O·4DMF}n (UPJS-14) built from Zn(ii) and Cd(ii) ions and extended tetrahedral tetraazo-tetracarboxylic acid (H4MTA) as a linker were prepared and characterised. Nitrogen adsorption measurements were performed on as-synthesized (AS), ethanol exchanged (EX) and freeze-dried (FD) materials at different activation temperatures of 60, 80, 100, 120, 150 and 200 °C to obtain the best textural properties. The largest surface areas of 830 m2 g−1 for UPJS-13 (FD) and 1057 m2 g−1 for UPJS-14 (FD) were calculated from the nitrogen adsorption isotherms for freeze-dried materials activated at mild activation temperature (80 °C). Subsequently, the prepared compounds were tested as adsorbents of greenhouse gases, carbon dioxide and methane, measured at high pressures. The maximal adsorption capacities were 30.01 wt% CO2 and 4.84 wt% CH4 for UPJS-13 (FD) and 24.56 wt% CO2 and 6.38 wt% CH4 for UPJS-14 (FD) at 20 bar and 30 °C.
Highlights
Metal–organic frameworks (MOFs) are one of the most exciting classes of porous materials discovered in the past few decades
The H4MTA ligand used in the preparation of amorphous metal–organic frameworks (aMOFs) in the present study was synthesized by the seven-step organic synthesis
The present study dealt with the preparation, characterisation and application of two novel aMOF compounds as adsorbents of greenhouse gases, carbon dioxide and methane
Summary
Metal–organic frameworks (MOFs) are one of the most exciting classes of porous materials discovered in the past few decades. MOFs are crystalline materials constructed from organic molecules (linkers) coordinated to metal ions or clusters to form interesting polymeric frameworks with a larger surface area and the advantage of pore size changing. Paper which the process of releasing solvent molecules is caused by heat. This activation way o en leads to the shrink or collapse of the polymeric frameworks causing a decrease of material's porosity or non-porosity. To reduce the activation temperature, a solvent exchange process is used as a tool, in which highboiling solvents are exchanged for low-boiling solvents and the thermal activation of porous material occurs at a lower temperature. Lyophilisation is a commercial process preliminary used in biological, biomedical processing, ne food production and preservation
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