Preparation of MIL-101-OH nanofluid mixed matrix membrane and its CO2 separation performance
Carbon capture utilization and storage(CCUS)is crucial in addressing environmental issues such as global warming and sea level rise caused by the greenhouse effect.Metal-organic framework(MOF)mixed matrix membranes(MMMs)have gained significant attention due to their excellent separation efficiency and high permeability.However,there are problems with the compatibility of fillers and polymer matrices,which can lead to the formation of interfacial defects.This reduces their potential value for applications.The study involved the preparation of MIL-101-OH solvent-free nanofluid(MIL-101-OH-M2070)through covalent bonding.MIL-101-OH was used as the main body,coupling agent KH560 as the connecting layer,and poly(ether amine)M2070 as the coronal layer.Mixed matrix membranes were then prepared with Pebax1657 to investigate their CO2 separation performance.To address the issues of poor interfacial compatibility of MOF and weak mechanical and thermal stability of poly(ether amine),MIL-101-OH and poly(ether amine)M2070 were covalently bonded.MIL-101-OH nanofluidic hybrid matrix membranes(MIL-101-OH MMMs)were compared with MIL-101-OH-M2070-MMMs to solve the problem of poor interfacial compatibility.Furthermore,the hybrid matrix membrane containing MIL-101-OH-M2070 demonstrated a significant enhancement in both the diffusion and solubility coefficients of CO2.This improvement can be attributed to the exceptional porosity of MIL-101-OH and the CO2 affinity of M2070.When compared to the pure Pebax1657 membrane,the CO2 permeation coefficient of MIL-101-OH-M2070 MMMs was found to be 215％higher while maintaining the same selectivity.
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