Surface and interface engineering in CO2-philic based UiO-66-NH2-PEI mixed matrix membranes via covalently bridging PVP for effective hydrogen purification. (27th January 2021)

• Record Type: Journal Article
• Authors: Ashtiani, S.; Khoshnamvand, M.; Bouša, D.; Šturala, J.; Sofer, Z.; Shaliutina-Kolešová, A.; Gardenö, D.; Friess, K.
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 7(2021)
• Page Start: 5449
• Page End: 5458
• Publication Date: 2021-01-27
• Subjects: Metal-organic framework -- UiO-66-NH2 -- Mixed-matrix membrane -- Polymer-filler interaction -- Facilitated transport membrane -- Hydrogen purification; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.11.081
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: We report on the fabrication of the defect-free mixed-matrix membrane (MMM) based on the polyethylenimine (PEI) matrix with uniformly dispersed metal-organic framework (MOF) filler UiO-66-NH2, covalently bonded by polyvinylpyrrolidone (PVP). The key feature of the molecular level-controlled filler deposition in prepared UiO-66-NH2 -PVP-PEI membranes was bridging the MOF particles to the PEI polymer matrix via PVP polymer chains. Such an approach improved the polymer-filler interface interactions and boosted the MOF dispersion into the polymer matrix for higher MOF loadings up to 23 wt %. The overall membrane structure and properties were characterized using FTIR, XRD, TG, DSC, SEM and 3D optical profiler techniques. Obtained results revealed the uniform dispersion of UiO-66-NH2, the strong polymer-filler interface interactions and entanglement of PEI with UiO-66-NH2 -PVP. Furthermore, the outstanding CO2 /H2 separation performance was determined for the UiO-66-NH2 -PVP-PEI membrane with 18 wt % of MOF loading; the average CO2 permeability of 394 Barrer and the separation factor of 12 for circa 100 h of the membrane testing overcome the 2008 Robeson reverse upper bound limit. Such improved CO2 /H2 separation performance was achieved due to the combination of the diffusion-solution mechanism with the preferential adsorption of the CO2 via the reversible bicarbonate reaction with amino groups of the UiO-66-NH2 and PEI which acts as fixed CO2 carrier sites in MMM structure. Graphical abstract: Image 1 Highlights: Fabricate new materials for CO2-selective membrane for hydrogen purification. Strong polymer-filler interface interaction at the interface of UiO-66-NH2 and PEI. Bridging approach by highly entangled polymer-filler for hydrogen purification. Enhancement of mixture gas durability and thermal stability of the membrane.