IBS Publications Repository: Defect-Free Mixed-Matrix Membranes with Hydrophilic Metal-Organic Polyhedra for Efficient Carbon Dioxide Separation

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Defect-Free Mixed-Matrix Membranes with Hydrophilic Metal-Organic Polyhedra for Efficient Carbon Dioxide Separation

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Title: Defect-Free Mixed-Matrix Membranes with Hydrophilic Metal-Organic Polyhedra for Efficient Carbon Dioxide Separation

Author(s): Yun Y.N.; Sohail M.; Moon J.-H.; Kim T.W.; Park K.M.; Chun D.H.; Park Y.C.; Cho C.-H.; Kim H.

Subject: carbon dioxide separation, ; membranes, ; metal-organic frameworks, ; mixed-matrix membrane, ; open metal sites

Abstract: Defect-free mixed-matrix membranes (MMMs) were prepared by incorporating hydrophilic metal-organic polyhedra (MOPs) into cross-linked polyethylene oxide (XLPEO) for efficient CO2 separation. Hydrophilic MOPs with triethylene glycol pendant groups, which were assembled by 5-tri(ethylene glycol) monomethyl ether isophthalic acid and CuII ions, were uniformly dispersed in XLPEO without particle agglomeration. Compared to conventional neat XLPEO, the homogenous dispersion of EG3-MOPs in XLPEO enhanced CO2 permeability of MMMs. Upon increasing the amount of EG3-MOPs, the membrane performance such as CO2/N2 selectivity was steadily improved because of unsaturated CuII sites at paddle-wheel units, which was confirmed by Cu K-edge XANES and TPD analysis. Therefore, such defect-free MMMs with unsaturated metal sites would contribute to enhance CO2 separation performance. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinhei