Abstract
AbstractThe metal‐organic framework (MOF) MIL‐68(In)‐NH2 was tested for dye removal from wastewater and carbon capture gas separation. MIL‐68(In)‐NH2 was synthesized as a neat, supported MOF thin film membrane and as spherical particles using pyridine as a modulator to shape the morphology. The neat MIL‐68(In)‐NH2 membranes were employed for dye removal in cross‐flow geometry, demonstrating strong molecular sieving. MIL‐68(In)‐NH2 particles were used for electrospinning of poylethersulfone mixed‐matrix membranes, applied in dead‐end filtration with unprecedented adsorption values. Additionally, the neat MOF membranes were used for H2/CO2 and CO2/CH4 separation.
Highlights
Metal-organic frameworks (MOFs) are porous, highly versatile, and tailorable hybrid materials, widely explored for separations [1]
metal-organic framework (MOF) are employed as membranes following different material concepts: 1) They can be synthesized on ceramic supports, e.g., a-Al2O3) as neat-MOF membranes by solvothermal methods or in a layer-by-layer fashion, yielding intergrown polycrystalline thin films [5,6,7]
The flux through the MIL-68(In)-NH2 membrane strongly decreases depending on the dye: for acid fuchsin, the permeance is only P = 116.9 L s–1m–2MPa–1, whereas for rose bengal, the permeance dropped to P = 75.9 L s–1m–2MPa–1
Summary
Metal-organic frameworks (MOFs) are porous, highly versatile, and tailorable hybrid materials, widely explored for separations [1]. The separations demonstrated consist of dead-end and cross-flow [16] setups to test dye removal from wastewater, whereas the Wicke-Kallenbach technique is utilized to perform gas separation membrane testing for carbon capture applications [13]. To tackle the dye pollution of water, neat MIL-68-NH2 membranes on ceramic supports in cross-flow geometry are tested. These neat MIL-68(In)-NH2 membranes have been prepared solvothermally on an a-Al2O3 support Due to their promising performance, they were tested for gas separation with binary mixtures of H2/CO2 and CO2/CH4. The membrane was rinsed with deionized water and dried at room temperature
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