Synthesis of ZIF‐94 from Recycled Mother Liquors: Study of the Influence of Its Loading on Postcombustion CO<sub>2</sub> Capture with Pebax Based Mixed Matrix Membranes
Md. Rafiul Hasan, Lorena Paseta, Magdalena Malankowska, Carlos Téllez, Joaquı́n Coronas
Abstract
Abstract Global energy demand is met in large part, by burning of fossil fuels, which is causing global warming. Mixed matrix membranes (MMMs) with metal organic frameworks (MOFs) as fillers are an interesting alternative for capturing post combustion CO 2 which would make the energy sector sustainable. This research is focused on the synthesis of MOF ZIF‐94 from the recycling of its mother liquors and the incorporation of synthesized MOF into a Pebax MH 1657 for MMM fabrication. The pH and the temperature of ZIF‐94 synthesis are modified and monitored and this results in various nanoparticle diameters (average particle size in the range of 41 ± 8–180 ± 73 nm). Incorporation of ZIF‐94 significantly improves the performance of the bare Pebax MH 1657 membrane. The maximum CO 2 /N 2 selectivity and CO 2 permeability are obtained for 10 wt% ZIF‐94 loading in 9 wt% (polymer concentration in 70/30 (v/v) ethanol/water solution) Pebax MH 1657 matrix being 36 ± 7 (71% increment compared to bare membrane) and 137 ± 31 Barrer (80% improvement), respectively.