Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 39, Pages 35820-35826Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13965
Keywords
metal-organic frameworks; hollow structure; gas separation; adsorption kinetics; diffusion
Funding
- National Natural Science Foundation of China [21701110]
- ShanghaiTech University
- ChEM of the SPST at ShanghaiTech [EM02161943]
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Metal-organic frameworks (MOFs) is a promising class of sorbent materials for swing adsorption gas separation. However, although sorption kinetics plays a major role in column breakthrough experiments, it is rarely studied with MOF materials. This is largely because the synthesis of uniform yet separation relevant MOFs is a challenging task. Here, we report a dual modulation approach for the synthesis of well-defined Mg-MOF-74 hexagonal rods with an extremely uniform size distribution (polydispersity index = 1.02). Through epitaxial growth and wet chemical etching, uniform hollow Ni-MOF-74 with plate-shaped caps were obtained. CO, adsorption kinetic study shows that hollow Ni-MOF-74 exhibits 54% faster diffusion rate compared to solid Ni-MOF-74 due to a shortened diffusion length, despite their identical CO, uptake capacity. This has led to a 21% extension of column breakthrough time during CO2/N-2 separation under identical conditions.
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