Nanostructure array assisted aggregation-based growth of a Co-MOF-74 membrane on a Ni-foam substrate for gas separation

• Published in: RSC advances Vol. 6; no. 96; pp. 94177 - 94183
• Main Authors: Qin, Xi, Sun, Yuxiu, Wang, Naixin, Wei, Qi, Xie, Linhua, Xie, Yabo, Li, Jian-Rong
• Format: Journal Article
• Language: English
• Published: 01.01.2016
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c6ra21320k

Metal-organic frameworks (MOFs) are promising candidates for membrane-based gas separation due to their regular crystalline lattices with relatively well-defined pore structures. To date, the preparation of integrated MOF membranes grown on porous substrates is still a major challenge. Herein, a facile aggregation-based growth method is developed to prepare a Co-MOF-74 (referred to as Co 2 (dobdc), H 4 dobdc = 2,5-dihydroxyterephthalic acid) membrane on a nanostructure array modified nickel (Ni) foam substrate. Ni 3 S 2 nanorod arrays directly grown from the Ni-foam substrate can aggregate and effectively regulate the growth of Co-MOF-74 crystals along a given direction. The effect of reaction time on membrane growth is discussed. The resulting Co-MOF-74 membrane presents good H 2 permeance and H 2 /CO 2 selectivity. A facile nanostructure assisted aggregation-based method was developed to fabricate a continuous Co-MOF-74 membrane on a Ni-foam substrate. The obtained Co-MOF-74 membrane presents good H 2 /CO 2 selectivity.