Enhanced Gas Separation Performance for H < sub > 2 < /sub > Purification Using MIL-68(ln)-NH < sub > 2 < /sub > /PES Mixed-Matrix Membranes

This study explored the incorporation of 10 wt. % of MIL-68(ln)-NH2 into PES membranes using a phase-inversion approach to enhance gas permeability and selectivity. The morphological, structural, and thermal properties of the resulting MOF/PES membrane were characterized using SEM, AFM, BET, XRD, FTIR, and TGA-DTG. Gas permeation experiments were conducted using different gases (CO2, N2, CH4, and H2) under different heating conditions (20-60 °C) to evaluate the gas permeability and selectivity of the MOF/PES membrane. The results showed that the incorporation of MOF into the mixed matrix membrane (MMMs) led to a 9% increase in porosity, 87% reduction in roughness, and 32% decrease in pore size compared to neat PES membranes. Significant changes in the morphology, crystallinity, and thermal stability were observed, with notable improvements of up to 22%. Moreover, the MOF/PES membrane exhibited high gas permeability (CO2 = 124656, N2 = 83650, CH4 = 159298, and H2 = 427075 Barrer) and selectivity (H2/N2= 5.7, H2/CO2= 4, CH4/N2= 2, and CH4/CO2= 1.7) for flammable gases. The optimal gas separation performance was observed at 20°C and 60°C for H2/N2 and H2/CO2 separation, respectively. These findings demonstrate the potential of MOF-based PES membranes for gas separation applications, particularly in H2 purification.PMID:38685331 | DOI:10.1016/j.chemosphere.2024.142166
Source: Chemosphere - Category: Chemistry Authors: Source Type: research