Constructing ultra-permeable pillar[5]arene-based membrane with intramolecular water channels and precise molecular fractionation
Journal of Membrane Science(2024)
摘要
Designing membranes with synthetic water channels has become an emerging topic to overcome the ubiquitous selectivity/permeability trade-off effect. In this study novel ultra-permeable thin film composite membranes with precise molecular fractionation were successfully fabricated. Per-hydroxylated pillar [5]arene (P [5]A), a macrocycle with a highly regular, cylindrical, angstrom-scale intramolecular cavity was applied as the aqueous monomer in interfacial polymerization (IP) to construct water channels in a thin film composite membrane. The competing effects of esterification and alkali-induced hydrolysis during IP were validated by investigating the effect of fabrication conditions. With almost complete rejection of model dyes >99.0% (e.g., Congo Red & Direct Red 23) and low retention of salts (e.g., 4.5% for NaCl & 18.9% for Na2SO4), the optimal membrane exhibited an ultra-high water permeance up to 267.1 L m(- 2) h(-1) bar-1, which is 3-10 times higher than most literature-reported membranes for similar applications. Also, the precision of dye/salt fractionation of the membrane was not affected by the increased feed salinity, with overall stable performance in 72 h continuous operation. A high flux recovery of >94.5% proved that the membrane had low fouling propensity. Overall, the new route explored in this study provided inspiration for designing ultra-permeable membranes with precise molecular separation for environmental applications.
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关键词
Membrane filtration,Water channel,Per-hydroxylated pillar[5]arene,Interfacial polymerization,Dye/salt fractionation
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