期刊
NANO LETTERS
卷 19, 期 8, 页码 4990-4996出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01211
关键词
Metal Organic Framework; MOF Membrane; nanochannels; Selective Ion Transport; in situ polymerization
类别
资金
- Hong Kong Research Grants Council via General Research Fund [GRF 17301415]
- NSFC-RGC Joint Research Scheme [N_HKU728/17]
- NSFC [51603046]
- Guangzhou Science and Technology Program [201804010243]
- Hong Kong UGC Special Equipment Grant [SEG HKU09]
Conventional ion-exchange polymeric membranes have limited selectivity due to their nonuniform and unstable structures. The rigid, regular, high porosity of metal organic framework (MOF) generally provides MOF membrane with exclusion/sieving effect but lack of electrostatic screening. Here we report for the first time a nonbiological highly selective MOF membrane with polyelectrolyte threaded in the nanochannel of metal organic framework (polyelectrolyte similar to MOF) and its selective transport of alkali metal cations. Poly(sodium vinyl sulfonated-co-acrylic acid)similar to MIL-53(Al) is prepared on anodic aluminum oxide substrate via steps of MOF MIL-53(Al) growth followed by in situ polymerization. The poly(VS-co-AA)similar to MIL-53(Al) membrane demonstrates highly specific selectivity in transport of alkali metal cations. Rate of ion transport correlates inversely with the hydrated diameter of the ion reaching a low limiting rate near 0.7 nm hydrated diameter. Charge exclusion is demonstrated with blockage of anion transport under a concentration gradient. The highly uniform porous nanostructure of MOF and ionic function of polyelectrolyte offers the MOF membrane with synergistic selectivity based on exclusion forces of the framework and Coulomb forces from fixed charges of polyelectrolytes in nanochannels.
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