LI Fang, LI Qiming, YU Xiaofei, et al. Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties[J]. CIESC Journal, 1987, (3). DOI: 10.11949/j.issn.0438-1157.20140988.
LI Fang, LI Qiming, YU Xiaofei, et al. Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties[J]. CIESC Journal, 1987, (3). DOI: 10.11949/j.issn.0438-1157.20140988.DOI:
Continuous and dense Mg-MOF-74 membranes were prepared through a combined layer-by-layer seeding assembling and secondary growth method based on 2
5-dihydroxybenzoic acid and magnesium acetate solution. The adhesion between Mg-MOF-74 crystals and a-Al2O3 support could be considerably improved by the alternate immersion assembling of 2
5-dihydroxybenzoic acid and magnesium acetate solution. Compared with the in-situ crystallization technique
Mg-MOF-74 membranes synthesized by four-cycle layer-by-layer method exhibited improved molecule-sieving properties due to optimized membrane continuity and density. Single gas test indicated that the best Mg-MOF-74 membrane had H2/CO2 ideal selectivity as high as 8.96
higher than its Knudsen diffusion selectivity. XRD measurement proved that the XRD patterns of Mg-MOF-74 membranes were consistent with those of powdered Mg-MOF-74 from published papers
which implied that our membranes were composed of randomly oriented MOF-74 crystals. SEM characterization showed that the MOF-74 crystals possessed wheat-shaped morphology and specific BET surface area as high as 1182 m2·g-1.