(567g) Highly Water Selective Mixed Matrix Membranes with UiO-66-Type MOFs in 6FDA-HAB/DABA Polyimide for Alcohol Dehydration Via Pervaporation

This study demonstrated the development of a highly water selective mixed matrix membranes (MMMs) consisting of porous UiO-66-NH₂ nanoparticles and 6FDA-HAB/DABA polyimide for isopropanol dehydration. The water in permeate can be concentrated to almost 100%. Results suggest incorporation of UiO-66-NH₂ nanoparticlesnot only can enhance separation factor but also greatly improve the normalized flux if the particle loading is within the range of 0-20wt%. The UiO-66-NH₂ based MMMs also exhibited stable isopropanol dehydration performance in uninterrupted 200-hour tests due to the good compatibility between UiO-66-NH₂ particles and the 6FDA-HAB/DABA polyimide resulting from the intermolecular bonding among the amine and imide groups. Besides, in order to investigate the effects of functional groups on UiO-66 particles on alcohol dehydration, MMMs containing the other two UiO-66-type MOF nanoparticles (UiO-66 and UiO-66-F₄) were also fabricated and compared with UiO-66-NH₂ based MMMs for alcohol dehydration. UiO-66-NH₂ based MMMs have the best separation performance among these three MMMs because the hydrophilic amino-functional groups can facilitate water transport. The excellent alcohol dehydration performance of UiO-66-NH₂ based MMMs opens up their great potential for alcohol dehydration via pervaporation.