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Defect‐Free Mixed‐Matrix Membranes with Hydrophilic Metal‐Organic Polyhedra for Efficient Carbon Dioxide Separation
Author(s) -
Yun Yang No,
Sohail Muhammad,
Moon JongHo,
Kim Tae Woo,
Park Kyeng Min,
Chun Dong Hyuk,
Park Young Cheol,
Cho ChurlHee,
Kim Hyunuk
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701647
Subject(s) - membrane , gas separation , chemical engineering , polyethylene glycol , ethylene glycol , chemistry , polymer chemistry , permeation , selectivity , triethylene glycol , materials science , ethylene oxide , polymer , organic chemistry , copolymer , biochemistry , engineering , catalysis
Defect‐free mixed‐matrix membranes (MMMs) were prepared by incorporating hydrophilic metal‐organic polyhedra (MOPs) into cross‐linked polyethylene oxide (XLPEO) for efficient CO 2 separation. Hydrophilic MOPs with triethylene glycol pendant groups, which were assembled by 5‐tri(ethylene glycol) monomethyl ether isophthalic acid and Cu II ions, were uniformly dispersed in XLPEO without particle agglomeration. Compared to conventional neat XLPEO, the homogenous dispersion of EG 3 ‐MOPs in XLPEO enhanced CO 2 permeability of MMMs. Upon increasing the amount of EG 3 ‐MOPs, the membrane performance such as CO 2 /N 2 selectivity was steadily improved because of unsaturated Cu II 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 CO 2 separation performance.