Hydrothermal synthesis, structure, fluorescence property of a novel 3D metal-organic framework with high thermal stability

Metal-Organic Frameworks and Their Composites for Environmental Applications

From the point of view of the ecological environment, contaminants such as heavy metal ions or toxic gases have caused harmful impacts on the environment and human health, and overcoming these adverse effects remains a serious and important task. Very recent, highly crystalline porous metal-organic frameworks (MOFs), with tailorable chemistry and excellent chemical stability, have shown promising properties in the field of removing various hazardous pollutants. This review concentrates on the recent progress of MOFs and MOF-based materials and their exploit in environmental applications, mainly including water treatment and gas storage and separation. Finally, challenges and trends of MOFs and MOF-based materials for future developments are discussed and explored.

High-Throughput Screening of Metal-Organic Frameworks for CO2 Capture in the Presence of Water

Competitive coadsorption of water is a major problem in the deployment of adsorption-based CO₂ capture. Water molecules may compete for adsorption sites, reducing the capacity of the material, and dehumidification prior to separating CO₂ from N₂ increases process complexity and cost. The development of adsorbent materials that can selectively adsorb CO₂ in the presence of water would be a major step forward in the deployment of CO₂ capture materials in practice. In this study, large-scale computational screening was carried out to search for metal-organic frameworks (MOFs) with high selectivity toward CO₂ over H₂O. Calculating framework charges for thousands of MOFs is a significant challenge, so initial screening used a fast, but approximate, charge calculation method. On the basis of the initial screening, 15 MOFs were selected, and Monte Carlo simulations were carried out to compute the adsorption isotherms for these MOFs using more accurate framework charges calculated by density functional theory. A detailed investigation was performed on the effect of using different methods for calculating partial charges, and it was found that electrostatic interactions contribute the majority of the adsorption energy of H₂O in the selected MOFs.